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Zhang W, Guo X, Jiang M. Influence of humic acid and bovine serum albumin on colloid-associated heavy metal transport in saturated porous media. ENVIRONMENTAL TECHNOLOGY 2023; 44:3965-3974. [PMID: 35546295 DOI: 10.1080/09593330.2022.2077135] [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: 02/15/2022] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
Colloid-facilitated contaminant transport in porous media has been widely observed in laboratory and field studies. In this study, the influence of two dissolved organic matters (DOMs), humic acid (HA) and bovine serum albumin (BSA), on the colloid-associated heavy metal transport, was investigated. Soil colloids with particle sizes <2 μm were prepared from bentonite. Glass bead was used as porous media for the column tests. The influence of DOM on the adsorption of Pb2+ and Cu2+ onto colloids was tested. Colloid mobility and colloid-metal co-transport in the presence/absence of DOMs were investigated by breakthrough tests. The test results showed that DOMs facilitated colloid mobility. The measured ζ-potentials showed that DOMs enhanced the electrostatic repulsion between colloids and glass beads and reduced colloid deposition. These findings were further confirmed by calculating the interaction energy using the DLVO theory. Batch tests showed the strong adsorption of Pb2+ and Cu2+ on the colloid, and the adsorption was enhanced by DOMs. The colloid-metal co-transport tests showed that colloids can significantly facilitate the transport of Pb2+ and Cu2+ and that the facilitation was further enhanced by DOMs. By heavy metals, the colloid mobility was retarded, mainly due to the increased deposition. The transport of Cu2+ facilitated by DOM was more obvious than that of Pb2+. Compared to BSA, the effect of HA on enhancing colloid mobility, increasing colloid adsorption to heavy metals, and hence on the facilitation of colloid-associated heavy metals transport was more prominent.
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Affiliation(s)
- Wenjie Zhang
- School of Mechanics and Engineering Science, Shanghai University Shanghai, People's Republic of China
| | - Xingzhang Guo
- School of Mechanics and Engineering Science, Shanghai University Shanghai, People's Republic of China
| | - Mohan Jiang
- School of Mechanics and Engineering Science, Shanghai University Shanghai, People's Republic of China
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2
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Shi M, Duan H, Feng L, Xiao M, He Q, Yan S. Sustainable ammonia recovery from anaerobic digestion effluent through pretreating the feed by biomass ash. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122655] [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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3
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Wang X, van der Sloot HA, Brown KG, Garrabrants AC, Chen Z, Hensel B, Kosson DS. Application and uncertainty of a geochemical speciation model for predicting oxyanion leaching from coal fly ash under different controlling mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2022; 438:129518. [PMID: 35999720 DOI: 10.1016/j.jhazmat.2022.129518] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 06/15/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
Three primary mechanisms (adsorption to iron oxides or analogous surfaces, co-precipitation with Ca, and substitution in ettringite) controlling oxyanion retention in coal fly ashes (CFAs) were identified by differentiating the leaching behavior of As, B, Cr, Mo, Se, and V from 30 CFAs. Fidelity evaluation of geochemical speciation modeling focused on six reference CFAs representing a range of CFA compositions, whereby different leaching-controlling mechanisms of oxyanions were systematically considered. For three reference CFAs with low Ca and S content, calibration of adsorption reactions for the diffuse double-layer model for hydrous ferric oxides improved the simultaneous prediction of oxyanion leaching, which reduced uncertainties in Se and V predictions caused by nonideal adsorption surfaces and competitive adsorption effects. For two reference CFAs with intermediate Ca content, the solubility constants for Ca-arsenates from literature and postulated phases of B, Cr, Se, and V were used to describe co-precipitation of oxyanions with Ca-bearing minerals under alkaline conditions. For the reference CFA with high Ca and S content, an ettringite solid solution was used to capture the simultaneous retention of all oxyanions at pH> 9.5. Overall, the simultaneous leaching predictions of oxyanions from a wide range of CFAs were improved by calibration of adsorption reactions and controlling solid phases.
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Affiliation(s)
- Xinyue Wang
- Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, United States
| | - Hans A van der Sloot
- Hans van der Sloot Consultancy, Glenn Millerhof 29, 1628 TS Hoorn, the Netherlands
| | - Kevin G Brown
- Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, United States
| | - Andrew C Garrabrants
- Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, United States
| | - Zhiliang Chen
- Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, United States
| | - Bruce Hensel
- Electric Power Research Institute (EPRI), 3420 Hillview Avenue, Palo Alto, CA 94304, United States
| | - David S Kosson
- Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37235, United States.
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4
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Liu Q, Huang Q, Zhao Y, Liu Y, Wang Q, Khan MA, Che X, Li X, Bai Y, Su X, Lin L, Zhao Y, Chen Y, Wang J. Dissolved organic matter (DOM) was detected in MSWI plant: An investigation of DOM and potential toxic elements variation in the bottom ash and fly ash. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 828:154339. [PMID: 35257758 DOI: 10.1016/j.scitotenv.2022.154339] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 02/22/2022] [Accepted: 03/02/2022] [Indexed: 06/14/2023]
Abstract
The content of dissolved organic matter (DOM) and potentially toxic elements (PTEs) were investigated in the bottom ash (BA) and fly ash (FA) of different sections of the municipal solid waste incineration (MSWI) plant. BA and FA were collected from the dry (BA1-BA2), burn (BA3-BA4), and burn-out (BA5) sections of the grate incinerator; FA was collected after denitration (DNFA), and from the deacidification tower (FA1) and bag-type dust remover (FA2), respectively. The DOM concentration in BA was higher than that in FA, the highest concentration was in BA3 (556.18 mg/kg), while the lowest concentration was in DNFA (17.53 mg/kg). DOM in BA was mainly composed of protein-like, fulvic-like, tryptophan-like, and humic-like substances, of which humic-like substances accounted for more than 40%. DOM in FA consisted of tryptophan-like and humic-like substances, of which humic-like substances accounted for more than 80%. DOM still existed in BA which may be related to the incomplete combustion, and the influence of microbes, while DOM was increased in FA1, which might be due to the addition of lime slurry. PTEs were analyzed by the Tessier extraction method, Fe-Mn hydroxide-bound fraction of PTEs increased in FA1 in which DOM concentration (137.22 mg/kg) was 7.83 times that in DNFA. The increase of DOM may lead to a higher risk of PTEs in FA. FTIR results indicated that DOM can bond to PTEs in BA and FA. The contents of humus-like substances in DOM were positively correlated with the effective fraction of As, Cu, Pb, Cr, and Cd. This paper investigated the risk of DOM existing in BA and FA in MSWI plant, which can provide a new perspective on how to deal with BA and FA, and reduce their environmental risks.
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Affiliation(s)
- Quan Liu
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Qing Huang
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China.
| | - Youcai Zhao
- The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Yin Liu
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Qingqing Wang
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Muhammad Amjad Khan
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Xuyang Che
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China
| | - Xiaohui Li
- Hainan Inspection and Detection Center for Modern Agriculture, Haikou, Hainan 570100, China
| | - Yang Bai
- College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; College of Management and Economics, Tianjin University, Tianjin 300072, China
| | - Xuesong Su
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Linyi Lin
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Yang Zhao
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Ying Chen
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China; Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan 570228, China
| | - Junfeng Wang
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, Haikou 570228, China; College of Ecology and Environment, Hainan University, Haikou, Hainan 570228, China; Center for Eco-Environmental Restoration Engineering of Hainan Province, Haikou 570228, China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou, Hainan 570228, China
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Long L, Jiang X, Lv G, Chen Q, Liu X, Chi Y, Yan J, Zhao X, Kong L, Qiu Q. Comparison of MSWI fly ash from grate-type and circulating fluidized bed incinerators under landfill leachate corrosion scenarios: the long-term leaching behavior and speciation of heavy metals. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:15057-15067. [PMID: 34625893 DOI: 10.1007/s11356-021-16618-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
In this study, the long-term leaching behaviors of Cd, Cr, Cu, Ni, Pb, and Zn in municipal solid waste incineration (MSWI) fly ash samples from grate-type (GT) and circulating fluidized bed (CFB) incinerators were investigated and compared under the simulated landfill leachate corrosion scenario, which was determined to be more severe than the acid rain corrosion scenario. The total heavy metal contents showed increasing hierarchies of Ni<Cr<Cd<Cu<Pb<Zn in the GT fly ash samples and Cd<Ni<Cr<Pb<Cu<Zn in the CFB fly ash samples. During the leaching processes, all heavy metals followed the two-stage leaching mode, including quick accumulation in stage 1 and then stable release in stage 2. The heavy metals with the highest accumulative leaching amounts were Cd, Pb, and Zn in GT fly ash and Cr, Cu, and Ni in CFB fly ash. In the landfill leachate corrosion scenario, Cd and Cr showed cationic patterns while Pb, Zn, and Cu showed amphoteric patterns. The leaching of Cd, Ni, and Cr arose from the dissolution of the salts they formed (solubility control), while the leaching of Cu, Pb, and Zn was controlled by the Ca-bearing compounds (sorption and precipitation control). A large difference in Pb leaching was observed: the cumulative leaching amount of GT fly ash (707.59-3072.36 mg/kg) was an order of magnitude higher than that of CFB fly ash (22.47-407.314 mg/kg), as a result of the higher primary content and larger proportion of the residual fraction in CFB fly ash. The acid-soluble and reducible fractions exhibited higher percentages than those of other fractions representing higher levels of environmental toxicity and risk. Therefore, more emphasis should be placed on the conversion of bioavailable fractions into stable fractions for the stabilization and utilization of MSWI fly ash.
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Affiliation(s)
- Ling Long
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
- Power China Hebei Electric Power Engineering Co., Ltd., Shijiazhuang, China
| | - Xuguang Jiang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China.
- Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, People's Republic of China.
| | - Guojun Lv
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
- Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, People's Republic of China
| | - Qian Chen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
- Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, People's Republic of China
| | - Xiaobo Liu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
- Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, People's Republic of China
| | - Yong Chi
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
- Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, People's Republic of China
| | - Jianhua Yan
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, China
- Zhejiang University Qingshanhu Energy Research Center, Linan, Hangzhou, People's Republic of China
| | - Xiaoli Zhao
- Power China Hebei Electric Power Engineering Co., Ltd., Shijiazhuang, China
| | - Litan Kong
- Power China Hebei Electric Power Engineering Co., Ltd., Shijiazhuang, China
| | - Qili Qiu
- School of Environmental Engineering, Nanjing Institute of Technology, No.1 Hongjing Road, Nanjing, 211167, China
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Koutela N, Fernández E, Saru ML, Psillakis E. A comprehensive study on the leaching of metals from heated tobacco sticks and cigarettes in water and natural waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 714:136700. [PMID: 32028551 DOI: 10.1016/j.scitotenv.2020.136700] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Revised: 01/09/2020] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
The leaching behavior of Al, Cr, Ni, Cu, Zn, As, Se, Cd, Ba, Hg and Pb in water from two types of heat-not-burn tobacco sticks is presented here, and compared to that from conventional cigarettes. The total concentration of each metal in solid tobacco products was initially determined. Concentrations in used and unused tobacco sticks were similar and generally, lower than those in unused conventional cigarettes. Studies on the contribution of paper, filter and tobacco revealed that tobacco was the major source of metal contamination. Smoking conventional cigarettes reduced the total metal concentrations since a substantial amount of metals was retained in the ash; a post-consumption waste that is difficult to collect. Batch leaching tests were performed to determine dissolved concentrations as a function of time. With the exceptions of As and (in most cases) Hg that were not detected, metals were released at varying rates. At 24 h of soaking the percentage of metals leached ranged from 0.2-43%. The contribution of paper, filter and tobacco to the dissolved concentrations at 24 h of leaching was investigated and in almost all cases tobacco was the major source of metal contamination. The dissolved concentrations from ash were low as metals were strongly bound. Varying the pH, ionic strength and humic acids content at environmentally relevant values did not affect leaching of metals at 24 h of soaking. The use of river water, rain water and seawater as leachants was also not found to alter dissolved concentrations at 24 h compared to ultrapure water. The results presented here suggest that the consequences of improper disposal of tobacco products in the environment are two-sided and that next to the generation of plastic litter, discarded tobacco products can also act as point sources of metal contamination. Public education campaigns focusing on the environmental impact and best disposal practices are urgently needed.
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Affiliation(s)
- Niki Koutela
- Laboratory of Aquatic Chemistry, School of Environmental Engineering, Polytechnioupolis, Technical University of Crete, GR-73100 Chania, Crete, Greece.
| | - Elena Fernández
- Laboratory of Aquatic Chemistry, School of Environmental Engineering, Polytechnioupolis, Technical University of Crete, GR-73100 Chania, Crete, Greece.
| | - Maria-Liliana Saru
- Laboratory of Aquatic Chemistry, School of Environmental Engineering, Polytechnioupolis, Technical University of Crete, GR-73100 Chania, Crete, Greece.
| | - Elefteria Psillakis
- Laboratory of Aquatic Chemistry, School of Environmental Engineering, Polytechnioupolis, Technical University of Crete, GR-73100 Chania, Crete, Greece.
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Yao Z, Xu Z, Shuai Q, Chen X, Jiang Z, Peng X, Li Y, An R, Jiang X, Li H. Solidification of Municipal Solid Waste Incineration Fly Ash through Co-Mechanical Treatment with Circulation Fluidized Bed Combustion Fly Ash. MATERIALS 2019; 13:ma13010141. [PMID: 31905835 PMCID: PMC6981360 DOI: 10.3390/ma13010141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/24/2019] [Accepted: 12/24/2019] [Indexed: 11/16/2022]
Abstract
This study aims to explore the solidification performance of municipal solid waste incineration fly ash (MSWIFA) through co-mechanical treatment with circulation fluidized bed combustion fly ash (CFBCFA). The mineral characterization, physical properties, and leaching resistance of the solidified bodies are investigated by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetry-differential thermal analysis (TG-DTA), compressive strength, porosity, and leaching test, respectively. C-S-H, ettringite (AFt), and Friedel's salt (FS) are the predominant hydrate products in the CFBCFA based solidified bodies, which are similar to the cement based solidified bodies. However, CFBCFA based solidified bodies exhibit higher compressive strength (36.7 MPa) than cement based solidified bodies (11.28 MPa), attributing to the three reasons: lower porosity and more compact internal structure of CFBCFA based solidified bodies; large amounts of Ca(OH)2 originating from MSWIFA are conducive to promoting the hydration reaction extent and compressive strength of the CFBCFA based solidified bodies; excessive Ca(OH)2 would cause compressive strength deterioration for the cement based solidified bodies. The heavy metals (Zn, Cu, Cr, Cd, and Pb) concentrations in the extraction solution of the CFBCFA based solidified bodies are far below the requirements of Chinese National Standard GB 5085.3-2007. The solidification of MSWIFA through co-mechanical treatment could be an ideal substitute for cement solidification technology.
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Affiliation(s)
- Zhengzhen Yao
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Zhonghui Xu
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Qin Shuai
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Xiaoyue Chen
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Zao Jiang
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Xi Peng
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Yu Li
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Ran An
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Xin Jiang
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
| | - Han Li
- Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
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Luo H, Cheng Y, He D, Yang EH. Review of leaching behavior of municipal solid waste incineration (MSWI) ash. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 668:90-103. [PMID: 30852230 DOI: 10.1016/j.scitotenv.2019.03.004] [Citation(s) in RCA: 125] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 06/09/2023]
Abstract
Incineration is widely adopted in modern waste management because it provides an effective way to minimize municipal solid waste that needs to be disposed of in landfills. The ash residue is often disposed by landfilling. Alternatively, the incineration ash may be recycled and reused for various applications. The crucial issues, however, are the leaching of harmful elements during the use and the end-of-life phases. This review summarizes extensive studies on leaching behavior of municipal solid waste incineration ash. Specifically, pollutants generated through leaching, factors governing leaching, methodologies to study leaching, leaching mechanisms, and treatments to reduce leaching. Many types of pollutants are generated through leaching from municipal solid waste incineration ash, in which heavy metals and organic contaminants are the most toxic and concerned. Ash properties, pH and liquid to solid ratio are the main factors governing municipal solid waste incineration ash leaching. Leaching behavior of municipal solid waste incineration ash is complicated and existing methods to evaluate leaching may not be able to represent the field conditions. Solubility and sorption are the two major leaching mechanisms. Many treatment methods have been proposed. However, not all methods are effective and some approaches are associated with high energy and high cost, which makes them less economically feasible and attractive.
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Affiliation(s)
- Hongwei Luo
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China; Energy Research Institute, Nanyang Technological University, Singapore 637553, Singapore
| | - Ying Cheng
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China
| | - Dongqin He
- College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
| | - En-Hua Yang
- School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore.
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9
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Zhou T, Zhao X, Wu S, Su L, Zhao Y. Efficient capture of aqueous humic acid using a functionalized stereoscopic porous activated carbon based on poly(acrylic acid)/food-waste hydrogel. J Environ Sci (China) 2019; 77:104-114. [PMID: 30573074 DOI: 10.1016/j.jes.2018.06.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 06/09/2023]
Abstract
Stereoscopic porous carbons have shown good potential in humic acid (HA) removal. In this work, a novel stereoscopic porous activated carbon (SPAC) was designed and synthesized via the self-assembly of a hydrogel based on food waste during in-situ polymerization, vacuum drying, carbonization, and activation. Then, the SPAC was functionalized with 3-aminopropyltriethoxysilane (APTES) and the adsorption behavior of the modified SPAC (SPAC-NH2) was studied systematically. The effects of pH, contact time, initial concentration of HA, and adsorbent dose were investigated, showing that optimal HA removal efficiency (>98.0%) could be achieved at an initial HA concentration of 100 mg/L. The experimental adsorption isotherm data was fitted to the Langmuir model with a maximum adsorption capacity of 156.0 mg HA/g SPAC-NH2. Analysis of the mechanism indicated that the removal of HA was mainly realized through the amidization reaction between the COOH groups of HA and the NH2 groups of APTES. All of the above results showed that SPAC-NH2 powder is an efficient, eco-friendly, and reusable adsorbent which is suitable for the removal of HA from wastewater.
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Affiliation(s)
- Tao Zhou
- The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Xin Zhao
- Shanghai Chengpei Enterprise Management Consulting Co., Ltd., Shanghai 200000, China
| | - Shuya Wu
- The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Lianghu Su
- Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
| | - Youcai Zhao
- The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1515 North Zhongshan Rd. (No. 2), Shanghai 200092, China.
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Gao Z, Li M, Sun Y, Yang W. Effects of oxygen functional complexes on arsenic adsorption over carbonaceous surface. JOURNAL OF HAZARDOUS MATERIALS 2018; 360:436-444. [PMID: 30142594 DOI: 10.1016/j.jhazmat.2018.08.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 08/07/2018] [Accepted: 08/09/2018] [Indexed: 06/08/2023]
Abstract
The adsorption mechanism of As2O3 on carbonaceous surface modified with oxygen functional complexes was studied using density functional theory to understand the effect of oxygen functional complexes on arsenic adsorption. Full-parameter geometrical optimization and single point energy were calculated on B3LYP/def2-SVP and B3LYP/def2-TZVP level. Results showed that As2O3 adsorption on bare carbonaceous surface took place in physical as well as chemical way. The adsorption energies were between -2.07 kJ/mol to -480.20 kJ/mol. Compared to armchair model, zigzag model was more suitable as a carbonaceous sorbent. The participation of oxygen functional complexes greatly promoted the surface activity of carbonaceous surface and its adsorption capacity on arsenic. The adsorption energies of arsenic on carbonaceous surface with oxygen functional complexes were between -111.56 kJ/mol to -669.46 kJ/mol. The promotion order of oxygen functional complexes on surface activity was: phenol > lactone > carbonyl > semiquinone > carboxyl. Oxygen functional complexes promoted adsorption capacity of carbonaceous surface through enhancing the activities of neighboring carbon atoms rather than directly providing active sites. Mayer bond order was a reliable way to understand the adsorption process of arsenic on carbonaceous surface. This study provides a new idea for using modified carbonaceous sorbent to remove arsenic pollution from power stations.
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Affiliation(s)
- Zhengyang Gao
- School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Minghui Li
- School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, China.
| | - Yao Sun
- School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, China
| | - Weijie Yang
- School of Energy and Power Engineering, North China Electric Power University, Baoding 071003, China.
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Ni P, Xiong Z, Tian C, Li H, Zhao Y, Zhang J, Zheng C. Influence of carbonation under oxy-fuel combustion flue gas on the leachability of heavy metals in MSWI fly ash. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 67:171-180. [PMID: 28551279 DOI: 10.1016/j.wasman.2017.05.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 05/03/2017] [Accepted: 05/11/2017] [Indexed: 06/07/2023]
Abstract
Due to the high cost of pure CO2, carbonation of MSWI fly ash has not been fully developed. It is essential to select a kind of reaction gas with rich CO2 instead of pure CO2. The CO2 uptake and leaching toxicity of heavy metals in three typical types of municipal solid waste incinerator (MSWI) fly ash were investigated with simulated oxy-fuel combustion flue gas under different reaction temperatures, which was compared with both pure CO2 and simulated air combustion flue gas. The CO2 uptake under simulated oxy-fuel combustion flue gas were similar to that of pure CO2. The leaching concentration of heavy metals in all MSWI fly ash samples, especially in ash from Changzhou, China (CZ), decreased after carbonation. Specifically, the leached Pb concentration of the CZ MSWI fly ash decreased 92% under oxy-fuel combustion flue gas, 95% under pure CO2 atmosphere and 84% under the air combustion flue gas. After carbonation, the leaching concentration of Pb was below the Chinese legal limit. The leaching concentration of Zn from CZ sample decreased 69% under oxy-fuel combustion flue gas, which of Cu, As, Cr and Hg decreased 25%, 33%, 11% and 21%, respectively. In the other two samples of Xuzhou, China (XZ) and Wuhan, China (WH), the leaching characteristics of heavy metals were similar to the CZ sample. The speciation of heavy metals was largely changed from the exchangeable to carbonated fraction because of the carbonation reaction under simulated oxy-fuel combustion flue gas. After carbonation reaction, most of heavy metals bound in carbonates became more stable and leached less. Therefore, oxy-fuel combustion flue gas could be a low-cost source for carbonation of MSWI fly ash.
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Affiliation(s)
- Peng Ni
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Zhuo Xiong
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Chong Tian
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Hailong Li
- School of Energy Science and Engineering, Central South University, Changsha, Hunan 410083, China
| | - Yongchun Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
| | - Junying Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
| | - Chuguang Zheng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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