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Li X, Ma C, Lyu J, He M, Wang J, Wang Q, Wang Z, You X, Li L. Influence and mechanism of alkali-modified sludge on coal water slurry properties. Environ Sci Pollut Res Int 2023; 30:27372-27381. [PMID: 36378385 DOI: 10.1007/s11356-022-24042-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
Municipal sludge (MS) is used to prepare coal water slurry (CWS). This practice is beneficial for resource utilization and reduces treatment costs and environmental pollution. In this study, alkali-modified municipal sludge (AMS) was prepared with Ca(OH)2 as modifier and mixed with coal to produce AMS-CWS. The effect and mechanism of MS and AMS on slurry ability, stability, and combustion characteristics of the CWS were explored. The results of the pulping experiments showed that the slurry concentration of the AMS-CWS was approximately 10% greater than that of MS-CWS. The water separation rates of MS-CWS and AMS-CWS were 5% and 5.26%, respectively, which were 13.62% and 13.36% less than that of CWS (18.62%). The zeta potential experiments verified these results. Combustion performance research shows that both MS and AMS have positive effects on combustion performance. The results of the contact angle experiments showed that the hydrophobicity of AMS was enhanced, which was beneficial for improving the pulping capacity of MS-CWS.
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Affiliation(s)
- Xiaoteng Li
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Chuandong Ma
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Jianqiao Lyu
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Meng He
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Junxiang Wang
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Qingbiao Wang
- National Engineering Laboratory for Coalmine Backfilling Mining, Shandong University of Science and Technology, Tai'an, 271019, Shandong, China
- Department of Resource and Civil Engineering, Shandong University of Science and Technology, Tai'an, 271019, Shandong, China
| | - Zhenhua Wang
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
- Yankuang National Engineering Research Center of Coal Slurry Gasification and Coal, Chemical Industry Co., Ltd., Jinan, 250101, China
| | - Xiaofang You
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Lin Li
- School of Chemistry and Biological Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
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Yao X, Gao M, Wei Z, Chen M, Shangguan W. Removal of hexanal in cooking fume by combination of storage and plasma-catalytic oxidation on alkali-modified Co-Mn solid solution. Chemosphere 2019; 220:738-747. [PMID: 30611072 DOI: 10.1016/j.chemosphere.2018.12.201] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 12/25/2018] [Accepted: 12/30/2018] [Indexed: 06/09/2023]
Abstract
Cooking oil fumes as an important source of volatile organic compounds in metropolitan areas are poisonous to the environment and human health. In this study, the removal of hexanal (a representative of cooking fume) using "storage-plasma catalytic oxidation" at ambient conditions has been investigated. Alkali-modified Co-Mn catalysts were synthesized by coprecipitation method and further characterized by XRD, SEM, N2 adsorption-desorption, H2-TPR, O2-TPD and XPS techniques. It was clearly shown that the Na modification afforded a remarkable enhancement in the hexanal storage capacity, which is ascribed to the formation of surface hydroxyls that resulted in the chemical adsorption. Moreover, the plasma-catalytic oxidation results showed 99.4% hexanal removal and 85.7% CO2 selectivity at a GHSV of 47700 h-1. XPS results revealed that Na modification promoted the formation of more abundant Co3+, Mn3+ cations and surface adsorbed oxygen species, thus facilitated the oxidation process. In-situ FTIR results revealed that Na modification could trigger disproportionation reaction, resulting in the transformation of adsorbed hexanal into alcohol and carboxylic acid thus further speeds up the oxidation rate. This work provides a low-cost, highly efficient and energy-consuming approach for the removal of gaseous cooking fume by storage and plasma catalytic oxidation cycle at room temperature.
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Affiliation(s)
- Xin Yao
- Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China
| | - Mengxiang Gao
- Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China
| | - Zhidong Wei
- Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China
| | - Mingxia Chen
- Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China
| | - Wenfeng Shangguan
- Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, PR China.
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Chen W, Gao X, Xu H, Wang K, Chen T. Preparation of modified waterworks sludge particles as adsorbent to enhance coagulation of slightly polluted source water. Environ Sci Pollut Res Int 2017; 24:19393-19401. [PMID: 28674956 DOI: 10.1007/s11356-017-9563-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Accepted: 06/14/2017] [Indexed: 06/07/2023]
Abstract
Without treatment, waterworks sludge is ineffective as an adsorbent. In this study, raw waterworks sludge was used as the raw material to prepare modified sludge particles through high-temperature calcination and alkali modification. The feasibility of using a combination of modified particles and polyaluminum chloride (PAC) as a coagulant for treatment of slightly polluted source water was also investigated. The composition, structure, and surface properties of the modified particles were characterized, and their capabilities for removing ammonia nitrogen and turbidity were determined. The results indicate that the optimal preparation conditions for the modified sludge particles were achieved by preparing the particles with a roasting temperature of 483.12 °C, a roasting time of 3.32 h, and a lye concentration of 3.75%. Furthermore, enhanced coagulation is strengthened with the addition of modified sludge particles, which is reflected by reduction of the required PAC dose and enhancement of the removal efficiency of ammonia nitrogen and turbidity by over 80 and 93%, respectively. Additional factors such as pH, temperature, dose, and dosing sequence were also evaluated. The optimum doses of modified particles and PAC were 40 and 15 mg/L, respectively, and adding modified particles at the same time as or prior to adding PAC improves removal efficiency.
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Affiliation(s)
- Wei Chen
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Xiaohong Gao
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Hang Xu
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Hohai University, Nanjing, 210098, China.
- College of Environment, Hohai University, Nanjing, 210098, China.
| | - Kang Wang
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Taoyuan Chen
- College of Environment, Hohai University, Nanjing, 210098, China
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