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Wang Y, Jia L, Guo B, Li J, Bai T, Jin Z, Jin Y. Investigation on the interaction mechanism during co-combustion of sewage sludge and coal slime: The effect of coal slime type and pretreatment method. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:172419. [PMID: 38614335 DOI: 10.1016/j.scitotenv.2024.172419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 03/23/2024] [Accepted: 04/10/2024] [Indexed: 04/15/2024]
Abstract
Co-combustion of sewage sludge (SS) and coal slime (CS) is the preferred method for mitigating their environmental impact and increasing their added value. However, the interaction mechanism between SS and CS during the co-combustion process has not yet developed a unified understanding. This work aims to obtain the effect of CS types on SS-CS co-combustion and reveal the interaction mechanism between SS and CS based on the influence of pretreatment methods on the interaction. The results showed that during co-combustion, SS reduced the ignition and burnout temperatures, and CS with high fixed carbon content (e.g., XCS) improved the comprehensive combustion characteristics. Principal component analysis showed that the effect of CS on co-combustion was more significant. The interaction between SS and CS mainly occurred within 100-700 °C, in which inhibition and synergism coexisted. The large differences in the interactions before and after de-volatilization and pickling treatments revealed that the volatiles and ash in SS were the main interaction factors. The analysis of the interaction mechanisms showed that the free radicals and heat released from the SS volatiles combustion accelerated the weight loss of CS, but the formation of tars from its incomplete combustion may inhibit the decomposition of CS. The interaction in the fixed carbon combustion stage was mainly caused by SS ash, which can catalyze the combustion of CS fixed carbon, but for the high ash CS (e.g., QCS), the combustion of fixed carbon was hindered by the addition of SS ash higher than 10 %. The final manifestation (synergy or inhibition) of SS and CS interactions was the result of the competitive balance of the above interactive behaviors. This work provides a more comprehensive understanding of the interaction between SS and CS during co-combustion.
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Affiliation(s)
- Yanlin Wang
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Li Jia
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Baihe Guo
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Jingkuan Li
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Tao Bai
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Zhiping Jin
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Yan Jin
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
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2
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Li J, Chen Y, Zhang Y, Wu J, Guo C, Jin Y, Wang Y. Effects of alkali and alkaline earth metals on co-combustion of sewage sludge and coal slime: Combustion characteristics, interactions, and kinetics. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 356:120735. [PMID: 38537474 DOI: 10.1016/j.jenvman.2024.120735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/22/2024] [Accepted: 03/19/2024] [Indexed: 04/07/2024]
Abstract
The co-combustion of sewage sludge (SS) and coal slime (CS) is a preferred method for their resource utilization, however, alkali and alkaline earth metals (AAEMs) in SS may affect the co-combustion process. In this work, the co-combustion behavior of AAEMs-rich SS and CS was investigated in terms of combustion characteristics, interactions, and combustion kinetics using a thermogravimetric analyzer. Further, the role of AAEMs in co-combustion was evaluated by loading Ca, K, Na, and Mg individually after pickling. The results revealed that co-combustion compensated for the limitations of the individual combustion processes, with SS reducing ignition and burnout temperatures and CS improving the comprehensive combustion characterization. Principal component analysis (PCA) showed that the effect of CS on co-combustion was more significant compared to SS. Significant synergies were observed in the weight loss phase of fixed carbon in the blends with 40%, 50%, and 60% CS ratios, where the peak temperature of fixed carbon combustion was reduced by 9.8 °C, 12.6 °C, and 13.1 °C, respectively, compared to the theoretical values. The effects of AAEMs on combustion were as follows: all AAEMs promoted the precipitation of volatiles except Ca, which showed inhibition of light volatiles; AAEMs had a significant catalytic effect on fixed carbon combustion. The improvement effect of AAEMs on the comprehensive combustion characteristics during co-combustion was Na > K > Mg > Ca. The catalytic effect of Na on fixed carbon was strongest at a loading of 5%, leading to a decrease in the apparent activation energy of fixed carbon combustion by 22.2 kJ/mol and a change in reactor order from n = 1 to n = 1.2 during co-combustion. This work provides a better understanding of the role of AAEMs in SS-CS co-combustion.
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Affiliation(s)
- Jingkuan Li
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Yun Chen
- Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Yuanyuan Zhang
- Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Jiao Wu
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Congxiu Guo
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China
| | - Yan Jin
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Yanlin Wang
- School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, Shanxi, China.
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Dorokhov VV, Nyashina GS, Strizhak PA. Thermogravimetric, kinetic study and gas emissions analysis of the thermal decomposition of waste-derived fuels. J Environ Sci (China) 2024; 137:155-171. [PMID: 37980004 DOI: 10.1016/j.jes.2023.02.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/27/2023] [Accepted: 02/27/2023] [Indexed: 11/20/2023]
Abstract
A wide range of wastes can potentially be used to generate thermal and electrical energy. The co-combustion of several types of waste as part of water-containing waste-derived fuels is a promising method for their recovery. In this research, we use thermogravimetric analysis and differential scanning calorimetry to study the thermal behavior and kinetics of coal slime, biomass, waste oils, and blends on their basis. We also analyze the concentrations of gaseous emissions. The results show that biomass, oils, and coal slime significantly affect each other in the course of their co-combustion when added to slurry fuels. The preparation of coal-water slurry based on slime and water reduced the ignition and burnout temperature by up to 16%. Adding biomass and waste oils additionally stimulated the slurry ignition and burnout, which occurred at lower temperatures. Relative to dry coal slime, threshold ignition temperatures and burnout temperatures decreased by 6%-9% and 17%-25%, respectively. Also, the use of biomass and waste oils as part of slurries inhibited NOх and SO2 emission by 2.75 times. According to the kinetic analysis, added biomass and waste turbine oil provide a 28%-51% reduction in the activation energy as compared to a coal-water slurry without additives.
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Affiliation(s)
- Vadim V Dorokhov
- Heat and Mass Transfer Laboratory, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, Russia
| | - Galina S Nyashina
- Heat and Mass Transfer Laboratory, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, Russia
| | - Pavel A Strizhak
- Heat and Mass Transfer Laboratory, National Research Tomsk Polytechnic University, 30 Lenin Avenue, Tomsk 634050, Russia.
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Han H, Du K, An X, Song Y, Zhao Z, Xu J, Jiang L, Wang G, Wang Y, Su S, Hu S, Xiang J. Migration and transformation of trace elements during sewage sludge and coal slime Co-combustion. CHEMOSPHERE 2023; 345:140342. [PMID: 37783355 DOI: 10.1016/j.chemosphere.2023.140342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 09/29/2023] [Accepted: 09/30/2023] [Indexed: 10/04/2023]
Abstract
Co-combustion of sewage sludge (SS) and coal slime (CS) could improve the combustion properties of the two materials, however, high levels of trace elements (TEs) can be released from the two wastes, resulting in secondary pollution. The migration and transformation behavior of As, Cr, Pb, Zn, and Mn during co-combustion is explored in current research. The results showed co-combustion could inhibit the emission of Zn, As, Pb, and Mn, and the effect was more pronounced for Zn, As and Mn. Meanwhile, minerals like kaolinite and gypsum were found to generated in the ash from co-combustion but not solo-combustion. Model experiments demonstrated that kaolinite captured As, Pb and Mn, while gypsum captured Zn, As and Mn but facilitated the emission of Pb and Cr. This well explained the distinct TEs emission characteristics between co-combustion and solo combustion. As the temperature elevated, kaolinite in co-combustion ash decomposed and the generation of gypsum was promoted. In this way, the emission ratios of Zn, As, and Mn initially increased but subsequently decreased between 700 and 1300 °C, whereas Pb and Cr emission ratios increased by twofold within the same temperature range. Leaching characteristics and risk assessment code on co-combustion ashes were also conducted in this study. The results indicated a marginal elevation in the risk associated with trace elements (TEs) following co-combustion, provided that all five TEs remained within the limits of national standards.
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Affiliation(s)
- Hengda Han
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Kuan Du
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Xiaoxue An
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yajie Song
- China Resources Power Technology Research Institute Co., Ltd, Shenzhen, 518000, China
| | - Zheng Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Jun Xu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Long Jiang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Guang Wang
- State Environment Protection key Laboratory of Environmental Monitoring Quality Control, China National Environmental Monitoring Centre, Beijing, 100012, China
| | - Yi Wang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Sheng Su
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Song Hu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Jun Xiang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
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Dong Y, Wang F, Ye Z, He F, Qin L, Lv G. Acid gas emission and ash fusion characteristics of multi-component leather solid waste incineration in bubbling fluidized bed. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 335:122249. [PMID: 37487872 DOI: 10.1016/j.envpol.2023.122249] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 06/15/2023] [Accepted: 07/21/2023] [Indexed: 07/26/2023]
Abstract
The tanning sludge (TS) and other tanning solid wastes are produced in significant quantities by the leather industry. To evaluate the combustion properties, acid gaseous pollutant conversion, and ash management, co-firing of TS with various wastes was investigated in a bubbling fluidized bed. TG-FTIR test indicated that tanning solid wastes had superior combustion properties and include more gaseous pollutants than TS. The leather mixed solid waste (LMSW) formed by mixing had better fuel characteristics than TS. The conversion rates of SO2 and HCl of LMSW incineration were 67% and 40%, respectively. The co-combustion of TS and solid wastes reduces the conversion rate of acid gas. Increasing the proportion of high-inorganic chlorine raw material could further reduce the conversion rate and increase the ash fusion temperature appropriately. Because ash and slag were primarily composed of Ca and Fe elements, the addition of calcium carbonate (CaCO3) can increase ash melting point while reducing acid gas emissions. When CaCO3 was added at a calcium to sulfur (Ca/S) ratio of 2, the acid gas emission was reduced by more than 80% and the softening temperature was raised by 90 °C. When Ca/S is greater than 2, the economics of adding CaCO3 decreased.
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Affiliation(s)
- Yuhang Dong
- State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China
| | - Fei Wang
- State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China.
| | - Zhirong Ye
- State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China
| | - Fengyu He
- State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China
| | - Lishan Qin
- State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China
| | - Guojun Lv
- State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China
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Zhong Y, Wan X, Lian X, Cheng W, Ma X, Wang D. Hydroxylamine facilitated catalytic degradation of methylene blue in a Fenton-like system for heat-treatment modified drinking water treatment residues. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27780-x. [PMID: 37284959 DOI: 10.1007/s11356-023-27780-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 05/16/2023] [Indexed: 06/08/2023]
Abstract
Rational treatment of drinking water treatment residues (WTR) has become an environmental and social issue due to the risk of secondary contamination. WTR has been commonly used to prepare adsorbents because of its clay-like pore structure, but then requires further treatment. In this study, a Fenton-like system of H-WTR/HA/H2O2 was constructed to degrade organic pollutants in water. Specifically, WTR was modified by heat treatment to increase its adsorption active site, and to accelerate Fe(III)/Fe(II) cycling on the catalyst surface by the addition of hydroxylamine (HA). Moreover, the effects of pH, HA and H2O2 dosage on the degradation were discussed with methylene blue (MB) as the target pollutant. The mechanism of the action of HA was analyzed and the reactive oxygen species in the reaction system were determined. Combined with the reusability and stability experiments, the removal efficiency of MB remained 65.36% after 5 cycles. Consequently, this study may provide new insights into the resource utilization of WTR.
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Affiliation(s)
- Yu Zhong
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Xiancheng Wan
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Xiaoyan Lian
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Wenyu Cheng
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Xiaoying Ma
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Dongtian Wang
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.
- Jiangsu Key Laboratory for Environment Functional Materials, School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, 215009, China.
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7
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Xu E, Miao Z, Jiang X. Influence of waste brake oil on the rheological properties of coal-sludge water slurry. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:40886-40894. [PMID: 36622592 DOI: 10.1007/s11356-022-25040-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 12/24/2022] [Indexed: 01/10/2023]
Abstract
In this work, the effect of waste brake oil (WBO) on the dispersion property of coal-sludge oil slurry (CSOS) was investigated and comprehensively analyzed. Apparent viscosity of CSOS decreases from 997 to 276 mPa.s with the increasing of SS content from 0 to 12% under the calorific value (CV) of 17.70 MJ/kg and oil/sludge ratio (O/S) of 2.0. The combination of sewage sludge (SS) and WBO could decrease the apparent viscosity of CSOS, and SS content and O/S are two important parameters to affect the apparent viscosity. WBO mainly contains the hydrocarbon compound and a lot of oxygenated functional groups according to its GC/MS results. WBO could cover on the surface of SS and coal particle, and reduce their hydrophobic character and the adsorbance amount of dispersant based on the FTIR, XPS and adsorption performance results. In addition, the mechanism of WBO on slurry characteristics of CSOS was investigated. With the low content of WBO, the liquid bridges from WBO force the solid particles to adhere together and form a stable network structure, thus reducing the flow ability of the suspension. With the increasing of WBO, the network structures could be broken into cells, resulting in a dramatic decrease in viscosity. This research provides a potential way to dispose the SS and waste industry oil.
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Affiliation(s)
- Enle Xu
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China.,Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China
| | - Zhenyong Miao
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China.,Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China
| | - Xiaofeng Jiang
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China. .,Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China.
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Wang Y, Jia L, Guo B, Shen X, Zheng X, Xiang J, Jin Y. Investigation of interaction mechanisms during co-combustion of sewage sludge and coal slime: Combustion characteristics and NO/SO 2 emission behavior. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158166. [PMID: 35988607 DOI: 10.1016/j.scitotenv.2022.158166] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/30/2022] [Accepted: 08/16/2022] [Indexed: 06/15/2023]
Abstract
Co-combustion of sewage sludge (SS) and coal slime (CS) is a promising method to achieve resource utilization of both solid wastes. However, the emission characteristics of NO/SO2 and the interaction mechanisms between SS and CS are unclear. In this paper, the co-combustion characteristics and NO/SO2 emission behavior of SS and CS were investigated using a thermogravimetric analyzer and a tube furnace combustion system, and the interactions between SS and CS were explored. The results revealed the presence of remarkable interactions between SS and CS during the co-combustion. For the combustion characteristics, non-catalytic factors (interaction between volatiles and heat synergy) and catalytic factors (catalysis of inorganic components) controlled the combustion stage of the heavy volatiles and fixed carbon of the blends, respectively, leading to an earlier combustion process. For NO and SO2 emission characteristics, SS-CS co-combustion had significant NO in-situ reduction and self-desulphurization characteristics at 800 °C and 900 °C. The best inhibition occurred at 900 °C and 50 % CS ratio, and NO and SO2 emission amounts were reduced by 0.25 mg/g and 1.37 mg/g, respectively, compared to the theoretical values. At 1000 °C, co-combustion promoted the emissions of both NO and SO2. The interaction mechanisms suggested that the reducing atmosphere created and the reducing gases released by SS combustion promoted the reduction of CS-NO, while the char formed by CS exhibited a significant reduction of SS-NO. In addition, the effect of CS addition on the mass transfer process enhanced the sulfur fixation of inorganic components in SS, which led to the suppression of SO2 production. These findings provide a better understanding of the interactions between SS and CS during SS-CS co-combustion.
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Affiliation(s)
- Yanlin Wang
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Li Jia
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Baihe Guo
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Xin Shen
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Xin Zheng
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Jun Xiang
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430000, Hubei, China
| | - Yan Jin
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
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Zhang Z, Huang Y, Zhu Z, Yu M, Gu L, Wang X, Liu Y, Wang R. Effect of CaO and montmorillonite additive on heavy metals behavior and environmental risk during sludge combustion. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 312:120024. [PMID: 36029905 DOI: 10.1016/j.envpol.2022.120024] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 08/07/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Serious pollution is caused by heavy metals (HMs) emission during sludge combustion treatment, but the addition of minerals has the ability to alleviate the migration of HMs to the gaseous state. In this study, HMs (As, Cr, Zn and Cu) behavior, speciation, and environmental risk during sludge combustion with CaO and montmorillonite (MMT) additive was investigated in the lab-scale tube furnace. The results showed that the sludge combustion was mainly determined by volatile matter. In general, CaO inhibited the volatilization of Cr, Zn, and Cu, but promoted As volatilization. MMT inhibited the volatilization of HMs, but the effect was not obvious at high temperatures. Besides, the improvement of retention effect was not found for Cr and Cu with the increase of CaO at 1000 °C, there might exist threshold value for CaO on HMs retention process. Meanwhile, CaO increased acid-soluble fraction of As significantly at high temperatures, decreased residual fraction of Cr by oxidation, converted Zn and Cu to residual fraction. MMT increased the acid-soluble fraction of As and residual fraction of Cr. In view of the HMs environmental risk in ash, the combustion temperature of sludge was necessary to control under 1000 °C and minerals additive amount was needed to manage above 1000 °C.
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Affiliation(s)
- Zhenrong Zhang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China; Huaneng Hunan Corporation, Changsha, Hunan, 410000, China
| | - Yaji Huang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China.
| | - Zhicheng Zhu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Mengzhu Yu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Liqun Gu
- Baoshan Iron and Steel Ltd: Shanghai Baosteel Group Corp, Shanghai, 201900, China
| | - Xinyu Wang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Yang Liu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Ruyi Wang
- Baoshan Iron and Steel Ltd: Shanghai Baosteel Group Corp, Shanghai, 201900, China
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10
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Hu J, Zhao L, Luo J, Gong H, Zhu N. A sustainable reuse strategy of converting waste activated sludge into biochar for contaminants removal from water: Modifications, applications and perspectives. JOURNAL OF HAZARDOUS MATERIALS 2022; 438:129437. [PMID: 35810514 DOI: 10.1016/j.jhazmat.2022.129437] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/02/2022] [Accepted: 06/19/2022] [Indexed: 06/15/2023]
Abstract
Conversion of sewage sludge to biochar for contaminants removal from water achieves the dual purpose of solid waste reuse and pollution elimination, in line with the concept of circular economy and carbon neutrality. However, the current understanding of sludge-derived biochar (SDB) for wastewater treatment is still limited, with a lack of summary regarding the effect of modification on the mechanism of SDB adsorption/catalytic removal aqueous contaminants. To advance knowledge in this aspect, this paper systematically reviews the recent studies on the use of (modified) SDB as adsorbents and in persulfate-based advanced oxidation processes (PS-AOPs) as catalysts for the contaminants removal from water over the past five years. Unmodified SDB not only exhibits stronger cation exchange and surface precipitation for heavy metals due to its nitrogen/mineral-rich properties, but also can provide abundant catalytic active sites for PS. An emphatic summary of how certain adsorption removal mechanisms of SDB or its catalytic performance in PS-AOPs can be enhanced by targeted regulation/modification such as increasing the specific surface area, functional groups, graphitization degree, N-doping or transition metal loading is presented. The interference of inorganic ions/natural organic matter is one of the unavoidable challenges that SDB is used for adsorption/catalytic removal of contaminants in real wastewater. Finally, this paper presents the future perspectives of SDB in the field of wastewater treatment. This review can contribute forefront knowledge and new ideas for advancing sludge treatment toward sustainable green circular economy.
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Affiliation(s)
- Jinwen Hu
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ling Zhao
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jinming Luo
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Huabo Gong
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Nanwen Zhu
- School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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11
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Wang Y, Zou L, Shao H, Bai Y, Liu Y, Zhao Q, Li F. Co-combustion of high alkali coal with municipal sludge: Thermal behaviour, kinetic analysis, and micro characteristic. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:156489. [PMID: 35667429 DOI: 10.1016/j.scitotenv.2022.156489] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 05/30/2022] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
Blending sludge rich in protein and aliphatic hydrocarbons into the high alkali coal (HAC) has been demonstrated to reduce the ash melting temperature of the HAC/sludge mixture, thereby increasing the effectiveness and efficiency of liquid slagging. However, whether the incorporation of sludge can affect the combustion stability of the original coal-fired boiler is still debatable. As the combustion stability of the fuel can directly affect the operational safety of the boiler, it is of great practical value for exploring the effect of sludge incorporation on the combustion performance of HAC. In this work, the thermal behaviour and microscopic properties of individual HAC, municipal sludge (MS) and HAC/MS mixtures were tested using a Thermogravimetric analyser (TGA) and a Fourier transform infrared (FTIR) spectrometer, respectively. The exothermic, thermodynamic and functional group evolution patterns during the combustion of these samples were also evaluated. Ignition temperatures (Ti) of the HAC/MS mixtures were relatively lower than that of individual HAC, and decreased with the increase in sludge mass ratio (SMR). The synergistic effect of the co-combustion of HAC and MS resulted in a slightly higher total heat release during the combustion of MS10HAC90 (i.e., the mass percentage of MS and HAC is 1:9) than HAC alone, however, the total heat release of the blend decreased progressively with increasing SMR. The experimental values of the average Eα for all four mixtures were lower than the theoretical values, indicating that the addition of MS lowered the reaction energy barriers of the mixtures. Consumption rates of the principal groups in samples during the oxidation and combustion all tended to increase progressively with increasing SMR. There are three major synergistic effects existing during co-combustion of HAC and MS: (1) the reaction of free radicals with benzene molecules; (2) the interaction of free radicals; and (3) the catalytic effect of alkali and alkaline earth metals. These findings can provide theoretical guidance for the determination of key parameters (mixing ratio) for the blending of HAC and MS, and can fill the research gap in terms of microscopic reactivity and synergistic effects during the co-combustion of HAC and MS.
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Affiliation(s)
- Yungang Wang
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China
| | - Li Zou
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China.
| | - Huaishuang Shao
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China
| | - Yanyuan Bai
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China
| | - Yang Liu
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China
| | - Qinxin Zhao
- Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, PR China.
| | - Feixiang Li
- Hubei Special Equipment Inspection and Testing Institute, Wuhan 430077, Hubei, PR China
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12
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Song GC, Xu WT, Yang XY, Song Q. Coupling effects of mineral components on arsenic transformation during coal combustion. JOURNAL OF HAZARDOUS MATERIALS 2022; 435:129040. [PMID: 35650722 DOI: 10.1016/j.jhazmat.2022.129040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 04/13/2022] [Accepted: 04/27/2022] [Indexed: 06/15/2023]
Abstract
Exploring arsenic (As) transformation during coal combustion is beneficial for reducing its pollution. Herein, combustion experiments were developed at 1100-1300 °C in a fixed-bed experimental system with 25 types of coal samples. The occurrences of As in coal and combustion products were characterized. All the original forms of As in coal were found to be unstable during combustion. As retained in ash existed as water-soluble and ion-exchangeable and residual forms, but only as residual form at combustion temperature above 1200 °C. The distribution of As in gaseous and solid combustion products varied widely by coal types, which resulted from the coupling effects of multi-minerals in coal. Co-combustion experiments were conducted using As model compounds and pure minerals, by which the interaction of Ca, Fe, Si and Al minerals to retain As was elucidated. The As transformation during coal combustion was primarily attributed to the coupling action of Ca, Fe, Si and Al minerals in coal. As a result, As was retained as Ca-Si-Al-As and Fe-Si-Al-As composite salts in the ash, which have little environmental hazard. Utilizing the coupling effects of multi-minerals during combustion help reduce As pollution from coal-fired plants.
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Affiliation(s)
- Guo-Chang Song
- Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Wen-Ting Xu
- Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Xing-Yu Yang
- Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
| | - Qiang Song
- Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
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13
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Piskunov M, Romanov D, Strizhak P, Yanovsky V. Individual and synergistic effects of modifications of the carrier medium of carbon-containing slurries on the viscosity and sedimentation stability. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.06.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Wang Y, Jia L, Guo B, Wang B, Zhang L, Zheng X, Xiang J, Jin Y. N migration and transformation during the co-combustion of sewage sludge and coal slime. WASTE MANAGEMENT (NEW YORK, N.Y.) 2022; 145:83-91. [PMID: 35525001 DOI: 10.1016/j.wasman.2022.04.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 03/19/2022] [Accepted: 04/26/2022] [Indexed: 06/14/2023]
Abstract
The co-combustion of sewage sludge and coal slime is considered a promising technique for reducing the volume of sewage sludge, adding value, and decreasing the risks associated with these wastes. This work aimed to study N migration and transformation mechanisms and the related interactions during the co-combustion of sewage sludge (SS) and coal slime (CS) by thermogravimetric-mass spectrometry combined with X-ray photoelectron spectroscopy. The results revealed that the main N-containing gases produced during the combustion of SS and CS were NH3 generated from Amino-N at 200-400 °C and HCN generated from heterocyclic nitrogen at 400-600 °C, respectively. The increase of CS ratio led to a decrease in the release of NH3 and NO, but an increase in the release of HCN. Distinct interactions were observed during the co-combustion process, which promoted the production of NH3 and inhibited the production of HCN and NO. Co-combustion inhibited the release of NO by 36.9% when the CS ratio was 50%. The interaction mechanism suggested that H radicals from SS promoted the premature decomposition of N species in CS, and increased the selectivity of N species for NH3 formation by promoting the conversion of heterocyclic-N to Amino-N. In addition, the interaction of char (in SS) and char (in CS) enhanced the reduction of NO. Above 600 °C, co-combustion promoted the retention of N species in the ash.
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Affiliation(s)
- Yanlin Wang
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Li Jia
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Baihe Guo
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Biru Wang
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Liu Zhang
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Xin Zheng
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
| | - Jun Xiang
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430000, Hubei, China
| | - Yan Jin
- School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
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15
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Jin M, Liu H, Deng H, Xiao H, Lu G, Yao H. Arsenic chemistry in municipal sewage sludge dewatering, thermal drying, and steam gasification: Effects of Fenton-CaO conditioning. WATER RESEARCH 2022; 213:118140. [PMID: 35152134 DOI: 10.1016/j.watres.2022.118140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 01/26/2022] [Accepted: 01/30/2022] [Indexed: 06/14/2023]
Abstract
In sludge disposal, Arsenic (As) poses serious secondary pollution due to its high toxicity and low stability. This work systematically studied the effects of Fenton-CaO composite conditioning on As chemistry throughout sludge dewatering, thermal drying, and steam gasification processes. The experimental results showed that, for raw sludge, 40.9% of As was released with filtrate discharging and 26.8-57.3% emitted with flue gas emission. When sludge was conditioned by Fenton-CaO, all of the As in the filtrate was fixed in the sludge cake and the releasing rate of gaseous As was reduced by up to 86.0%. Furthermore, the comprehensive results of the model compounds experiment, sequential extraction, and thermodynamic calculations revealed the effects of Fe/Ca conditioners on As species evolution. In the Fenton pre-oxidation, As(V) was reduced to As(III) due to the decreasing Eh caused by the excessive Fe(II). After adding CaO, As(III)/DMA (dimethyl arsenic) was adsorbed onto the surface of amorphous Fe(OH)3 that was introduced by Fenton's reagent, 50% and 43% of which were then oxidized or demethylated to form As(V)/MMA (monomethyl arsenic), respectively. In the following drying process at 120-180 °C, the FeOOH and CaO derived by residual Fe/Ca conditioners could promote the oxidation of 30% of the rest As(III) by the catalytic effect or directly reacting with it. In the final steam gasification process, the very little As(III) left in the dry sludge was released with the gas phase and the proportion of As(V) in gasification ash almost reached 100%. In short, Fenton-CaO composite conditioning could achieve the near-zero emission of As and reduce the toxicity of the products throughout the whole sludge treatment process.
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Affiliation(s)
- Minghao Jin
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Huan Liu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Hongping Deng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Han Xiao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Geng Lu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hong Yao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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16
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Zhu Y, Zhai Y, Li S, Liu X, Wang B, Liu X, Fan Y, Shi H, Li C, Zhu Y. Thermal treatment of sewage sludge: A comparative review of the conversion principle, recovery methods and bioavailability-predicting of phosphorus. CHEMOSPHERE 2022; 291:133053. [PMID: 34861255 DOI: 10.1016/j.chemosphere.2021.133053] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/11/2021] [Accepted: 11/22/2021] [Indexed: 06/13/2023]
Abstract
Phosphorus is a nutrient that is essential to nature and human life and has attracted attention because of its very limited reserves. Dwindling phosphorus reserves and soaring prices have made the recovery of phosphorus from waste biosolids even more urgent. Waste activated sludge, as the final destination of most of the phosphorus in human domestic and industrial water, has been considered as a reliable source of phosphorus recovery. The thermal treatment method of sewage sludge is currently a relatively environmentally friendly disposal method, which mainly includes incineration, pyrolysis and hydrothermal carbonization. This paper reviews the methods for the recovery of different forms of phosphorus (wet chemical, thermochemical and electrodialysis) from solid products obtained from different sludge thermal treatment methods (incinerated sewage sludge ash, pyrolysis of sewage sludge char and hydrochar) and the bioavailability of the recovered phosphorus products. Incineration of sewage sludge is currently the most established and effective method for recovering phosphorus from the thermal treatment products of sewage sludge. One of the wet chemical methods has been applied on a commercial scale and is expected to be further developed for future industrial applications. Pyrolysis and hydrothermal carbonation still have many research gaps in this field. Based on their principles and laboratory performance, both of them have the potential to recover phosphorus and should be further explored.
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Affiliation(s)
- Ya Zhu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Yunbo Zhai
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China.
| | - Shanhong Li
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Xiangmin Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Bei Wang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Xiaoping Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Yuwei Fan
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Haoran Shi
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Caiting Li
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, China
| | - Yun Zhu
- College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China.
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17
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Combustion, Pyrolysis, and Gasification of Waste-Derived Fuel Slurries, Low-Grade Liquids, and High-Moisture Waste: Review. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12031039] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The article discusses the modern achievements in the field of thermal recovery of industrial and municipal waste. The average accumulation rate and calorific value of typical wastes were analyzed. The focus is on the opportunities to exploit the energy potential of high-moisture waste, low-grade liquid components, and fuel slurries. We consider the relevant results in the field of combustion, pyrolysis, and gasification of such fuels. The main attention is paid to synergistic effects, the influence of additives, and external conditions on the process performance. Vortex combustion chambers, boilers with burners, and nozzles for fuel injection, grate, and fluidized bed boilers can be used for the combustion of waste-derived liquid, high-moisture, and slurry fuels. The following difficulties are possible: long ignition delay, incomplete combustion, low combustion temperature and specific calorific value, high emissions (including particulate matter, polycyclic aromatic hydrocarbons), fast slagging, and difficult spraying. A successful solution to these problems is possible due to the use of auxiliary fuel; boiler modifications; oxy-fuel combustion; and the preparation of multi-component fuels, including the use of additives. An analysis of methods of waste recovery in the composition of slurries for fuel gas production showed that there are several main areas of research: pyrolysis and gasification of coal–water slurry with additives of oil waste; study of the influence of external conditions on the characteristics of final products; and the use of specialized additives and catalysts to improve the efficiency of the pyrolysis and gasification. The prospects for improving the characteristics of thermochemical conversion of such fuels are highlighted.
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18
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Xia Y, Deng J, Hu B, Yang Q, Li J, Gu H, Zhou G. Ready-to-implement low-carbon retrofit of coal-fired power plants in China: Optimal scenarios selection based on sludge and photovoltaic utilization. ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY 2022; 9:100147. [PMID: 36157856 PMCID: PMC9488090 DOI: 10.1016/j.ese.2022.100147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 06/16/2023]
Abstract
Currently the flexible demand for high proportion penetration of renewable energy depends on coal-fired units (CFUs), and the large-scale phase-out of CFUs in a short time is not realistic in China. Due to urban expansion, approximately 458 Chinese coal-fired power plants (CFPPs) are now located in cities. Limited by space, urban CFUs face difficulty in becoming equipped with carbon capture and storage systems. This presents a sizeable challenge for the low-carbon transition of urban CFPPs and carbon neutral processes. Here, we present a ready-to-implement method to reduce the carbon emission of CFPPs in limited space: roof photovoltaic-assisted power generation combined with sludge co-combustion for coal-fired power generation systems (PVSCs). We also consider nonurban CFPPs with the method of roof photovoltaic-assisted power generation (PVs) only. Based on remaining life cycle analysis, we find that the PVSCs could save 28.47 Mt of coal, reduce CO2 emissions by 69.76 Mt, treat 125.70 Mt of sludge, and also generate 12.08 billion RMB worth of electricity revenue per year. In addition, our scenario analysis shows that PVSCs are more profitable when choosing an urban CFU with a remaining life of more than 12 years and while the sludge treatment subsidy is set at 100 RMB t-1. Under strict and lenient CFU decommissioning policies, CFUs with a remaining life of between 19 and 30 years and between 13 and 24 years should be selected for PVs, respectively. Thus, we conclude that PVSCs can not only generate economic benefits but also facilitate carbon reduction and solid waste treatment.
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Affiliation(s)
- Yunchao Xia
- China-EU Institute for Clean and Renewable Energy, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
| | - Jian Deng
- State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
| | - Bo Hu
- State Grid Liaoning Electric Power Co., Ltd, Shenyang, 110006, Liaoning Province, China
| | - Qing Yang
- China-EU Institute for Clean and Renewable Energy, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
- State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
- School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
| | - Jianlan Li
- China-EU Institute for Clean and Renewable Energy, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
- School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, 430074, Hubei Province, China
| | - Hongqun Gu
- State Grid Liaoning Electric Power Co., Ltd, Shenyang, 110006, Liaoning Province, China
| | - Guiping Zhou
- State Grid Liaoning Electric Power Co., Ltd, Shenyang, 110006, Liaoning Province, China
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19
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Zhang X, Yu J, Jin B, Huang Y, Wang Z. Improving the Adsorption Capacity of the Sorbent for Gaseous PbCl 2 during Incineration by Forming Pb 3(PO 4) 2: Preparation of the Sorbent and Evaluation of Adsorption Performance. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c03319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xuezhong Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Jianfei Yu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Baosheng Jin
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Yaji Huang
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Zhifei Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
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20
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Cai H, Liu J, Kuo J, Xie W, Evrendilek F, Zhang G. Ash-to-emission pollution controls on co-combustion of textile dyeing sludge and waste tea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 794:148667. [PMID: 34323763 DOI: 10.1016/j.scitotenv.2021.148667] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 06/13/2021] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Given the globally increased waste stream of textile dyeing sludge (TDS), its co-combustion with agricultural residues appears as an environmentally and economically viable solution in a circular economy. This study aimed to quantify the migrations and chemical speciations of heavy metals in the bottom ashes and gas emissions of the co-combustion of TDS and waste tea (WT). The addition of WT increased the fixation rate of As from 66.70 to 83.33% and promoted the chemical speciation of As and Cd from the acid extractable state to the residue one. With the temperature rise to 1000 °C, the fixation rates of As, Cd, and Pb in the bottom ashes fell to 27.73, 8.38, and 15.40%, respectively. The chemical speciation perniciousness of Zn, Cu, Ni, Mn, Cr, Cd, and Pb declined with the increased temperature. The ash composition changed with the new appearances of NaAlSi3O8, CaFe2O4, NaFe(SO4)2, and MgCrO4 at 1000 °C. The addition of WT increased CO2 and NOx but decreased SO2 emissions in the range of 680-1000 °C. ANN-based joint optimization indicated that the co-combustion emitted SO2 slightly less than did the TDS combustion. These results contribute to a better understanding of ash-to-emission pollution control for the co-combustion of TDS and WT.
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Affiliation(s)
- Haiming Cai
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Jingyong Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Jiahong Kuo
- Department of Safety, Health and Environmental Engineering, National United University, Miaoli 36063, Taiwan
| | - Wuming Xie
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Fatih Evrendilek
- Department of Environmental Engineering, Bolu Abant Izzet Baysal University, Bolu 14052, Turkey
| | - Gang Zhang
- Engineering Research Center of None-food Biomass Efficient Pyrolysis and Utilization Technology of Guangdong Higher Education Institutes, Dongguan University of Technology, Dongguan 523808, China
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21
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Zhao Y, Duan FA, Cui Z, Hong J, Ni SQ. Insights into the vertical distribution of the microbiota in steel plant soils with potentially toxic elements and PAHs contamination after 60 years operation: Abundance, structure, co-occurrence network and functionality. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 786:147338. [PMID: 33971607 DOI: 10.1016/j.scitotenv.2021.147338] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 04/18/2021] [Accepted: 04/20/2021] [Indexed: 05/14/2023]
Abstract
Both potentially toxic elements (PTEs) and polycyclic aromatic hydrocarbons (PAHs) are widely present in soil contaminated by steel industries. This study assessed the vertical variation (at 20 cm, 40 cm, 60 cm, 80 cm, 120 cm, and 150 cm depth) of bacterial abundance, community structure, functional genes related to PAHs degradation, and community co-occurrence patterns in an old steel plant soils which contaminated by PTEs and PAHs for 60 years. The excessive PAHs and PTEs in steel plant soils were benzo (a) pyrene, benzo (b) fluoranthene, dibenzo (a, h) anthracene, indeno (1,2,3-c, d) pyrene, and lead (Pb). The abundance and composition of bacterial community considerably changed with soil depth in two study areas with different pollution degrees. The results of co-occurrence network analysis indicated that the top genera in blast furnace zone identified as the potential keystone taxa were Haliangium, Blastococcus, Nitrospira, and Sulfurifustis. And in coking zone, the top genera were Gaiella. The predictions of bacterial metabolism function using PICRUSt showed that the PAHs-PTEs contaminated soil still had the potential for PAHs degradation, but most PTEs negatively correlated with PAHs degradation genes. The total sulfur (TS), acenaphthene (ANA), and Zinc (Zn) were the key factors to drive development of bacterial communities in the steel plant soils. As far as we know, this is the first investigation of vertical distribution and interaction of the bacterial microbiota in the aging soils of steel plant contaminated with PTEs and PAHs.
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Affiliation(s)
- Yiyi Zhao
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, China; Suzhou Research Institute, Shandong University, Suzhou, Jiangsu 215123, China
| | - Fu-Ang Duan
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, China
| | - Zhaojie Cui
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, China
| | - Jinglan Hong
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, China
| | - Shou-Qing Ni
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong 266237, China; Suzhou Research Institute, Shandong University, Suzhou, Jiangsu 215123, China.
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Thermochemical and Toxic Element Behavior during Co-Combustion of Coal and Municipal Sludge. Molecules 2021; 26:molecules26144170. [PMID: 34299445 PMCID: PMC8307717 DOI: 10.3390/molecules26144170] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 06/24/2021] [Accepted: 07/05/2021] [Indexed: 11/16/2022] Open
Abstract
The thermochemical and kinetic behavior of co-combustion of coal, municipal sludge (MS) and their blends at different ratios were investigated by thermogravimetric analysis. Simulation experiments were performed in a vacuum tube furnace to determine the conversion behavior of toxic elements. The results show that the combustion processes of the blends of coal and municipal sludge are divided into three stages and the combustion curves of the blends are located between those of individual coal and municipal sludge samples. The DTGmax of the sample with 10% sludge addition reaches a maximum at the heating rate of 20 °C/min, indicating that the combustion characteristics of coal can be improved during co-combustion. Strong interactions were observed between coal and municipal sludge during the co-combustion. The volatilization rates of toxic elements decrease with an increasing proportion of sludge in the blends during co-combustion, which indicates that the co-combustion of coal and sludge can effectively reduce the volatilization rate of toxic elements. The study reflects the potential of municipal sludge as a blended fuel and the environmental effects of co-combustion of coal and municipal sludge.
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Dhote L, Pandey RA, Middey A, Mandal N, Kumar S. Co-combustion of distillery sludge and coal for application in boiler and subsequent utilization of the generated bottom ash. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:36742-36752. [PMID: 33710486 DOI: 10.1007/s11356-021-13277-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 03/01/2021] [Indexed: 06/12/2023]
Abstract
Combustion stands as one of the essential methods in resource recovery for disposal of distillery sludge. In this study, sludge along with coal has been considered an option for co-combustion in the grate furnace aiming for further application as a boiler fuel. Detailed analysis was carried out to verify the feasibility of co-combustion of sludge with coal. Distillery sludge was blended with coal as a mixed fuel at co-combustion ratios of 20%, 30%, and 40% in grate furnace. The results of the analysis indicated that the combustion with 40% sludge mixed coal is suitable for application as a fuel in boiler. According to the chemical composition of bottom ash, weight loss from 460 to 800°C indicated the presence of C-C and C-H. Also, EDX and XRD analyses of mixed fuel was carried out to determine the mineralogical composition. The presence of quartz (SiO2), mullite (3Al2O32SiO2), and hematite (Fe2O3) present in the ash can be used as mineral additives in cement industries. The study also provided a promising approach towards diverting combustion bottom ash from landfills for its utilization in various industries which can be a possible cost-effective solution.
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Affiliation(s)
- Lekha Dhote
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 2010 02, India
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Ram Avatar Pandey
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Anirban Middey
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Neelkamal Mandal
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Sunil Kumar
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India.
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Nikitin AD, Nyashina GS, Ryzhkov AF, Strizhak PA. Anthropogenic emissions from the combustion of composite coal-based fuels. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 772:144909. [PMID: 33770856 DOI: 10.1016/j.scitotenv.2020.144909] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 12/26/2020] [Accepted: 12/27/2020] [Indexed: 06/12/2023]
Abstract
Composite fuels made of waste from coal, petroleum and wood processing industries have a high environmental and economic potential. In this research, we experimentally studied the concentrations of the most hazardous gaseous anthropogenic emissions (CO2, SO2, NO) from waste-based fuel combustion. Using two techniques operating in complementary temperature ranges, we obtained data on SO2 and NO emissions in the temperature range from 300 °C to 1000°C, including all the stages of thermochemical conversion of fuels. A quasi-stationary technique was used, based on a setup of thermogravimetric analysis with mass spectrometry, to obtain information in a low-temperature range (300-600°C). This technique allows the conversion at a low controlled rate of heating a sample together with the furnace. To obtain data in a high-temperature range (700-1000°C), a non-stationary technique was used, where the sample was introduced into a pre-heated furnace. The conditions were established in which it was possible to reduce the concentration of flue gases from the combustion of the compositions under study (replacement of the coal part with water, injection of water vapor, addition of biomass, selection of the temperature range). The impact of water vapors was determined when they were injected into the chemical reaction zone together with air and when they were formed naturally by evaporation from the fuel sample. Unlike biomass that reduces the emissions of sulfur oxides from composite fuels due to the mechanical dilution of the mixture, water vapor present in the heterogeneous reaction zone decreases the gaseous anthropogenic emissions through chemical reactions and conversion of a part of fuel sulfur and nitrogen to an inactive form (neutral to the environment).
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Affiliation(s)
- A D Nikitin
- Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation
| | - G S Nyashina
- National Research Tomsk Polytechnic University, Tomsk, Russian Federation
| | - A F Ryzhkov
- Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation
| | - P A Strizhak
- National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
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Li Q, Sun X, Ouche Q, Wang C, Zhang H, Guo J. Novel approach to improving wastewater treatment and sewage sludge combustion using pulverized coal-activated sludge. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:797-803. [PMID: 33135234 DOI: 10.1002/wer.1474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 10/22/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
Sewage and sludge are usually treated separately. Considering improving sludge treatment while improving sewage treatment is beneficial to the synergetic effect of sewage treatment and sludge treatment. The efficiency of pulverized coal-activated sludge (PAS) on contaminant removal, sludge calorific value, and combustion characteristic was investigated in contrast to conventional activated sludge (CAS) using the laboratory-scale sequencing batch reactor (SBR). Results indicated that the average chemical oxygen demand, ammonium nitrogen, total nitrogen, and total phosphorus removal efficiency of PAS were highest under a dosage of 0.4 g/L, which were 98.56%, 94.22%, 68.60%, and 95.96%, respectively. The average effluent concentration satisfied the Level A discharge standard of pollutants for municipal wastewater treatment plants (GB18918-2002). The calorific value and maximum weight loss of PAS gradually increased adjusting the dosage of pulverized coal. At the pulverized coal dosage of 0.2 g/L, the calorific value of PAS with 70% water content is 3,824.07 kJ/kg, which can satisfy the requirement of self-maintained combustion. Overall, the pulverized coal can simultaneously improve the treatment of wastewater in SBR and promote the sludge combustion by increasing calorific value. Therefore, PAS system is an innovation based on improving the sewage treatment sludge combustion. PRACTITIONER POINTS: An innovative method to simultaneously improving wastewater treatment and sewage sludge combustion using pulverized coal-activated sludge was developed. The average COD, NH 4 + - N , TN, and TP removal efficiency of PAS-0.4 is best. The 70% moisture content sludge calorific values of 3,824.07 kJ/kg in PAS-0.2 can satisfy the requirement of self-maintained combustion.
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Affiliation(s)
- Qian Li
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China
| | - Xiaojie Sun
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China
| | - Quanyi Ouche
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China
| | - Chunlian Wang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China
| | - Hongxia Zhang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China
| | - Jinghan Guo
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, China
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26
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Advances in Biomass Co-Combustion with Fossil Fuels in the European Context: A Review. Processes (Basel) 2021. [DOI: 10.3390/pr9010100] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Co-combustion of biomass-based fuels and fossil fuels in power plant boilers, utility boilers, and process furnaces is a widely acknowledged means of efficient heat and power production, offering higher power production than comparable systems with sole biomass combustion. This, in combination with CO2 and other greenhouse gases abatement and low specific cost of system retrofit to co-combustion, counts among the tangible advantages of co-combustion application. Technical and operational issues regarding the accelerated fouling, slagging, and corrosion risk, as well as optimal combustion air distribution impact on produced greenhouse gases emissions and ash properties, belong to intensely researched topics nowadays in parallel with the combustion aggregates design optimization, the advanced feed pretreatment techniques, and the co-combustion life cycle assessment. This review addresses the said topics in a systematic manner, starting with feed availability, its pretreatment, fuel properties and combustor types, followed by operational issues, greenhouse gases, and other harmful emissions trends, as well as ash properties and utilization. The body of relevant literature sources is table-wise classified according to numerous criteria pertaining to individual paper sections, providing a concise and complex insight into the research methods, analyzed systems, and obtained results. Recent advances achieved in individual studies and the discovered synergies between co-combusted fuels types and their shares in blended fuel are summed up and discussed. Actual research challenges and prospects are briefly touched on as well.
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Zhang J, Zou H, Liu J, Evrendilek F, Xie W, He Y, Buyukada M. Comparative (co-)pyrolytic performances and by-products of textile dyeing sludge and cattle manure: Deeper insights from Py-GC/MS, TG-FTIR, 2D-COS and PCA analyses. JOURNAL OF HAZARDOUS MATERIALS 2021; 401:123276. [PMID: 32634665 DOI: 10.1016/j.jhazmat.2020.123276] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 06/01/2020] [Accepted: 06/17/2020] [Indexed: 05/24/2023]
Abstract
Not only does pyrolysis recover energy and value-added by-products but also reduces waste stream volume. The low volatiles and high ash contents of textile dyeing sludge (TDS) limit its mono-pyrolysis performance. This study aimed to conduct an in-depth analysis of its co-pyrolytic performance with cattle manure (CM). The co-pyrolysis enhanced the volatiles emission from the early devolatilization stage whose reaction mechanism shifted from a diffusion model to a reaction-order model. The further cracking of macromolecular materials was mainly elucidated by the reaction-order model. The temperature dependency of the co-pyrolytic gases was of the following order: aliphatic hydrocarbons > CO2 > alcohols, phenols, ethers, aldehydes, ketones, and carboxylic acids. The main co-pyrolytic volatile products were coumaran and 4-vinylguaiacol. The relative content of guaiacol-type components could be enhanced by co-pyrolysis and lowering the operational temperature to 450 °C. The interaction of co-pyrolysis enriched the char aromaticity. Our findings provide practical insights into the control and application opportunities and limitations on the high value-added energy and products from the co-pyrolysis of TDS and CM.
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Affiliation(s)
- Junhui Zhang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Huihuang Zou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Jingyong Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
| | - Fatih Evrendilek
- Department of Environmental Engineering, Bolu Abant Izzet Baysal University, Bolu, 14052, Turkey
| | - Wuming Xie
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yao He
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Musa Buyukada
- Department of Chemical Engineering, Bolu Abant Izzet Baysal University, Bolu, 14052, Turkey
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28
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Gong H, Huang Y, Hu H, Shi M, Fu B, Luo C, Yan D, Yao H. The potential oxidation characteristics of CaCr 2O 4 during coal combustion with solid waste in a fluidized bed boiler: A thermogravimetric analysis. CHEMOSPHERE 2021; 263:127974. [PMID: 32828060 DOI: 10.1016/j.chemosphere.2020.127974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/04/2020] [Accepted: 08/06/2020] [Indexed: 06/11/2023]
Abstract
CaCr2O4 (Cr (III)), mainly generated through the decomposition of CaCrO4 (Cr (VI)), is a significant intermediate for toxic Cr (VI) formation during solid fuel combustion. In this study, the formation, oxidation and sulfation kinetics of CaCr2O4 were analyzed to forecast the potential of CaCr2O4 oxidation during co-firing of coal and solid waste in a circulating fluidized bed boiler. The results indicated that the formation and oxidation of CaCr2O4 were fitted to a single step nucleation and growth model while CaCr2O4 sulfation was fitted to a shrinking core model. CaCr2O4 formation through CaCrO4 decomposition was favored in oxygen-lean atmosphere and considerably suppressed in the presence of oxygen. In contrast, CaCr2O4 oxidation was mainly determined by the contacts between CaCr2O4 and CaSO4/CaO, which influenced not only oxidation rates but also the product species. Moreover, the oxidation reactivity of CaCr2O4 was higher in the presence of CaO than that of CaSO4. On the other hand, CaCr2O4 sulfation can occur more easily than CaCr2O4 oxidation, the reaction rate of which was deeply affected by sulfate product layer. Findings in this study suggested that spraying calcium in furnace for desulphurization may increase the risk of CaCr2O4 oxidation. Measures including the adjustment of Ca/S ratio in blended fuel (with added limestone) and operating conditions (such as temperature and local atmosphere) in co-firing system could be taken to control CaCr2O4 formation and oxidation.
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Affiliation(s)
- Hongyu Gong
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yongda Huang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Hongyun Hu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Mengya Shi
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Biao Fu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Cong Luo
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Dahai Yan
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Hong Yao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
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29
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Huang Y, Gong H, Hu H, Fu B, Yuan B, Li S, Luo G, Yao H. Migration and emission behavior of arsenic and selenium in a circulating fluidized bed power plant burning arsenic/selenium-enriched coal. CHEMOSPHERE 2021; 263:127920. [PMID: 32822936 DOI: 10.1016/j.chemosphere.2020.127920] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/23/2020] [Accepted: 08/03/2020] [Indexed: 06/11/2023]
Abstract
Arsenic (As) and selenium (Se) pollution caused by coal combustion is receiving increasing concerns. The environmental impacts of As/Se are determined not only by stack emission but also by leaching process from combustion byproducts. For a better control of As/Se emission from As/Se-enriched coal combustion, this study investigated the migration and emission behavior of As/Se in a circulating fluidized bed (CFB) power plant equipped with fabric filter (FF) and wet flue gas desulfurization (WFGD) system. The results demonstrated that arsenic was both enriched in bottom ash (41.4-47.6%) and fly ash (52.4-58.6%), while selenium was mainly captured by fly ash (73.9-83.4%). Limestone injection into furnace promoted As/Se retention in ash residues. Arsenic was mainly converted into arsenate in high-temperature regions and partly trapped in bottom ash as arsenite. In contrast, selenium capture mainly occurred in low-temperature flue gas by the formation of selenite, because of the poor thermal stability of most selenite. Triplet-tank method can totally remove arsenic in WFGD wastewater. And 18.4-58.7% of selenium was removed, resulting from the precipitation of Se4+ anions with highly soluble Se6+ anions remaining in wastewater. The concentrations of As and Se in the stack emission were 0.25-1.02 and 0.96-2.24 μg/m3, receptively. The CFB boiler equipped with FF + WFGD was shown to provide good control of the As/Se emission into the atmosphere. Leaching tests suggested that more attention should be paid to As leachability from fly ash/gypsum, and Se leachability from gypsum/sludge.
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Affiliation(s)
- Yongda Huang
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
| | - Hongyu Gong
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
| | - Hongyun Hu
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China.
| | - Biao Fu
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
| | - Bing Yuan
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
| | - Shuai Li
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
| | - Guangqian Luo
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
| | - Hong Yao
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Luoyu Road #1037, Wuhan, 430074, Hubei, China
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Liu Y, Liu G, Yousaf B, Zhang J, Zhou L. Carbon fractionation and stable carbon isotopic fingerprint of road dusts near coal power plant with emphases on coal-related source apportionment. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 202:110888. [PMID: 32585485 DOI: 10.1016/j.ecoenv.2020.110888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 06/05/2020] [Accepted: 06/09/2020] [Indexed: 06/11/2023]
Abstract
Road dust from coal utilization is a significant source contributing to the generation of pollutants that can affect the health of people residing within close proximity to roadways. In this study, road dust samples were collected from different directions centered around a coal-fired power plant in Huainan. Black carbon (BC), soot, char, organic carbon (OC) and total carbon (TC), as well as the δ13C of samples, were determined. Compared to the reference locations which were distant from the power plant, the research areas surrounding the power plant were featured by significantly higher OC/BC ratio and TC concentration. The OC/BC showed significant difference in urban vs. rural areas, and at different distances from the central power plant, which implied that the source and spread of carbonaceous species was dominantly affected by wind direction and urban/rural area differences. Surface morphology analysis showed that the road dust was mixed with spherical particles similar to fly ash. High-resolution XPS C1s spectrum revealed the existence of metal carbide, metal carbonate, and CF3 in the road dust samples. The speciation of carbon in road dusts was found correlated with sampling directions and urban functional areas. Based on the δ13C and OC/BC, it could be inferred that coal-related substances might be important sources of road dusts.
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Affiliation(s)
- Yuan Liu
- CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, Anhui, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075,Shaanxi, China
| | - Guijian Liu
- CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, Anhui, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075,Shaanxi, China.
| | - Balal Yousaf
- CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, Anhui, China
| | - Jiamei Zhang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230026, Anhui, China
| | - Li Zhou
- CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, Anhui, China
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31
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Liang J, Zhang P, Cai Y, Wang Q, Zhou Z. Thermal effects. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2020; 92:1406-1411. [PMID: 32291829 DOI: 10.1002/wer.1337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 03/31/2020] [Accepted: 04/04/2020] [Indexed: 06/11/2023]
Abstract
This review paper focuses on the researches published in 2019 in the field of thermal effects in wastewater and solid waste treatment. The content of this review paper includes five parts: wastewater and sludge treatment, nutrient removal and recovery, membrane technology, heavy metal removal and immobilization, and organic waste utilization. © 2020 Water Environment Federation PRACTITIONER POINTS: Thermal effect plays an important role in treatment of wastewater and sewage sludge. Recovery of nitrogen and phosphorus from wastewater and sewage sludge reduces environmental pollution and offers new products. Temperature improves removal and recovery of heavy metals and organic wastes.
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Affiliation(s)
- Jinsong Liang
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, China
| | - Panyue Zhang
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, China
| | - Yajing Cai
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, China
| | - Qingyan Wang
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, China
| | - Zeyan Zhou
- College of Environmental Science & Engineering, Beijing Forestry University, Beijing, China
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32
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Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge. ENERGIES 2020. [DOI: 10.3390/en13164164] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this paper, hydrochars and pyrochars were produced at 260 °C under different residence times (2 and 4 h) using anaerobic digested sewage sludge (SSL) as initial feedstock. The effect of reaction time on the fuel properties of hydrochars and pyrochars was evaluated. Moreover, the combustion kinetics of raw SSL and the derived pyrochars and hydrochars without coal blending were determined at two different air flows (20 and 90 mL/min) and compared. In the same conditions, the yield of hydrochar was significantly lower than that of pyrochar, confirming the different reaction pathways followed in each process. The results showed hydrochars have lower carbon recovery and energy yield than pyrochars, making the latter more suitable for energy purposes. The thermogravimetric combustion study showed that both thermochemical treatments increased the ignition temperature but decreased the burnout temperature, which results in higher stability during handling and storage. However, raw SSL is better for combustion than hydrochar according to the combustibility index. In addition, the kinetic study showed that the activation energy of the combustion of biochars, especially pyrochar, is lower than that of raw SSL, which is advantageous for their combustion.
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33
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A prediction of arsenic and selenium emission during the process of bituminous and lignite coal co-combustion. CHEMICAL PAPERS 2020. [DOI: 10.1007/s11696-020-01058-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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34
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Zhang Y, Xu Z, Tu Y, Wang J, Li J. Study on properties of coal-sludge-slurry prepared by sludge from coal chemical industry. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.03.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Relative Environmental, Economic, and Energy Performance Indicators of Fuel Compositions with Biomass. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10062092] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The present study deals with the experimental research findings for the characteristics of ignition (ignition delay times, minimum ignition temperature) and combustion (maximum combustion temperature, concentration of anthropogenic emission), as well as theoretical calculations of integral environmental, economic, and energy performance indicators of fuel compositions based on coal processing waste with the most typical types of biomass (sawdust, leaves, straw, oil-containing waste, and rapeseed oil). Based on the results of the experiments, involving the co-combustion of biomass (10% mass) with coal processing waste (90% mass) as part of slurry fuels, we establish differences in the concentrations of NOx and SOx in the gaseous combustion products. They make up from 36 to 218 ppm when analyzing the flue gases of coal and fuel slurries. Additionally, the values of relative environmental, economic, and energy performance indicators were calculated for a group of biomass-containing fuel compositions. The calculation results for equal weight coefficients are presented. It was shown that the efficiency of slurry fuels with biomass is 10%–24% better than that of coal and 2%–8% better than that of filter-cake without additives. Much lower anthropogenic emissions (NOx by 25%–62% and SOx by 61%–88%) are confirmed when solid fossil fuels are partly or completely replaced with slurry fuels.
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