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Ren X, Liu D, Chen W, Jiang G, Wu Z, Song K. Investigation of the characteristics of concentrated leachate from six municipal solid waste incineration power plants in China. RSC Adv 2018; 8:13159-13166. [PMID: 35542543 PMCID: PMC9079747 DOI: 10.1039/c7ra13259j] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 03/21/2018] [Indexed: 11/21/2022] Open
Abstract
The characteristics of concentrated leachate in municipal solid waste (MSW) incineration power plants were analyzed for CODCr, BOD5, the concentration of heavy metals, and spectral characteristics of dissolved organic matter (DOM). We performed correlation-principal component analysis to analyze the data. The samples were collected from leachate treatment plants of six MSW incineration power plants in China, all of which have a typical treatment process. Our study showed that the samples have high content of organic matter with extremely low biodegradability, various heavy metals, and a large amount of negative ions such as Cl-, SO4 2- and PO4 3- in the concentrated leachate. The intense fluorescent absorption peaks in the visible and ultraviolet regions of the ultraviolet-visible spectra and three-dimensional fluorescence spectra suggest that the concentrated leachate contains a large amount of refractory organic matter mainly consisting of fulvic acid. The humification indexes (HIX) of samples ranged from 1.26 to 14.24 when the biodegradability indexes (BIX) ranged from 0.10 to 2.25. Correlation analysis revealed that the concentration of Cl-, PO4 3-, and NO3 - is significantly correlated with the property of the DOM, and the concentration of Ca, Cr, and SO4 2- almost has no correlation with other indicators in the concentrated leachate. The characteristics of the concentrated leachate are reflected by three principal components: PC1 is mainly related to the DOM, which is relatively stable and hardly degrades, this component may reflect the degradability and humification degree of the concentrated leachate. PC2 reflects the degradability of the concentrated leachate; a higher score in its positive direction indicates greater degradability of the concentrated leachate. PC3 has little influence on the characteristics of the concentrated leachate. This research can provide a theoretical basis for the effective treatment of concentrated leachate of MSW incineration power plants.
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Affiliation(s)
- Xu Ren
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University No. 111, North Section 1, 2nd Ring Road Chengdu 610031 China
| | - Dan Liu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University No. 111, North Section 1, 2nd Ring Road Chengdu 610031 China
| | - Weiming Chen
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University No. 111, North Section 1, 2nd Ring Road Chengdu 610031 China
| | - Guobin Jiang
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University No. 111, North Section 1, 2nd Ring Road Chengdu 610031 China
| | - Zihan Wu
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University No. 111, North Section 1, 2nd Ring Road Chengdu 610031 China
| | - Kai Song
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University No. 111, North Section 1, 2nd Ring Road Chengdu 610031 China
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102
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Gu Z, Chen W, Li Q, Wang Y, Wu C, Zhang A. Degradation of recalcitrant organics in landfill concentrated leachate by a microwave-activated peroxydisulfate process. RSC Adv 2018; 8:32461-32469. [PMID: 35547700 PMCID: PMC9086385 DOI: 10.1039/c8ra06543h] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 09/11/2018] [Indexed: 11/21/2022] Open
Abstract
A microwave-activated peroxydisulfate process was used to the pre-treatment for recalcitrant organics in concentrated leachate.
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Affiliation(s)
- Zhepei Gu
- Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610066
- China
| | - Weiming Chen
- Faculty of Geosciences and Environmental Engineering
- Southwest Jiaotong University
- Chengdu 611765
- China
| | - Qibin Li
- Faculty of Geosciences and Environmental Engineering
- Southwest Jiaotong University
- Chengdu 611765
- China
| | - Ying Wang
- Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610066
- China
| | - Chuanwei Wu
- Faculty of Geosciences and Environmental Engineering
- Southwest Jiaotong University
- Chengdu 611765
- China
| | - Aiping Zhang
- Key Laboratory of Treatment for Special Wastewater of Sichuan Province Higher Education System
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610066
- China
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103
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Hong M, Lu G, Hou C, She S, Zhu L. Advanced treatment of landfill leachate membrane concentrates: performance comparison, biosafety and toxic residue analysis. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:2949-2958. [PMID: 29210682 DOI: 10.2166/wst.2017.469] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
With the improvement of people's consciousness about health, more attention has been paid to the biosafety of effluent reaching conventional discharge standard. In this contribution, removal efficiency of chemical oxygen demand (COD), acute toxicity, genotoxicity and estrogenicity in landfill leachate membrane concentrates (MCs) among UV-Fenton, Fenton and activated carbon adsorption process were compared. Daphnia magna acute toxicity assay, comet assay, cytokinesis-block micronucleus and E-screen assay were performed to assess whether the effluent reaching the main parameters of Chinese Discharge Standard (GB 16889-2008) still had toxic residues. Under the conditions that COD of effluents treated by the three processes were up to the discharge standard, no obvious toxic residue was found in the effluent of UV-Fenton treatment, but effluent from Fenton or activated carbon adsorption process showed genotoxicity or estrogenicity to some extent. Dynamic analysis of UV-Fenton degradation process for estrogen simulation solutions was also conducted, and the formation of intermediates was detected by gas chromatography-mass spectrometry (GC/MS). Toxic residues might be caused by the lack of treatment duration and the formation of more toxic intermediates. UV-Fenton was found to be efficient for the treatment of MCs. Biosafety should be concerned when a new wastewater discharge standard is being established.
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Affiliation(s)
- Mianwei Hong
- School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China E-mail:
| | - Gang Lu
- School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China E-mail:
| | - Changcheng Hou
- School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China E-mail:
| | - Shaohua She
- School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China E-mail:
| | - Lingfei Zhu
- School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China E-mail:
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104
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Hu L, Liu Y, Zeng G, Chen G, Wan J, Zeng Y, Wang L, Wu H, Xu P, Zhang C, Cheng M, Hu T. Organic matters removal from landfill leachate by immobilized Phanerochaete chrysosporium loaded with graphitic carbon nitride under visible light irradiation. CHEMOSPHERE 2017; 184:1071-1079. [PMID: 28662549 DOI: 10.1016/j.chemosphere.2017.06.065] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 05/18/2017] [Accepted: 06/15/2017] [Indexed: 05/27/2023]
Abstract
This study investigated the technical applicability of a combination of Phanerochaete chrysosporium (P. chrysosporium) with photocatalyst graphitic carbon nitride (g-C3N4) for organic matters removal from landfill leachate under visible light irradiation. Photocatalyst g-C3N4 was well immobilized on the hyphae surface of P. chrysosporium by calcium alginate. The typical absorption edge in visible light region for g-C3N4 was at about 460 nm, and the optical absorption bandgap of g-C3N4 was estimated to be 2.70 eV, demonstrating the great photoresponsive ability of g-C3N4. An optimized g-C3N4 content of 0.10 g in immobilized P. chrysosporium and an optimized immobilized P. chrysosporium dosage of 1.0 g were suitable for organic matters removal. The removal efficiency of total organic carbon (TOC) reached 74.99% in 72 h with the initial TOC concentration of 100 mg L-1. In addition, the gas chromatography coupled with mass spectrometry (GC-MS) measurements showed that immobilized P. chrysosporium presented an outstanding removal performance for almost all organic compounds in landfill leachate, especially for the volatile fatty acids and long-chain hydrocarbons. The overall results indicate that the combination P. chrysosporium with photocatalyst g-C3N4 for organic matters removal from landfill leachate may provide a more comprehensive potential for the landfill leachate treatment.
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Affiliation(s)
- Liang Hu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Yutang Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China.
| | - Guiqiu Chen
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China.
| | - Jia Wan
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Yunxiong Zeng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Longlu Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha, 410082, PR China
| | - Haipeng Wu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Piao Xu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Chen Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Min Cheng
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
| | - Tianjue Hu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, PR China
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105
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de Medeiros Engelmann P, Dos Santos VHJM, Moser LI, do Canto Bruzza E, Barbieri CB, Barela PS, de Moraes DP, Augustin AH, Goudinho FS, Melo CL, Ketzer JMM, Rodrigues LF. Environmental monitoring of water resources around a municipal landfill of the Rio Grande do Sul state, Brazil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:21398-21411. [PMID: 28744679 DOI: 10.1007/s11356-017-9725-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 07/06/2017] [Indexed: 06/07/2023]
Abstract
In Brazil, landfills are commonly used as a method for the final disposal of waste that is compliant with the legislation. This technique, however, presents a risk to surface water and groundwater resources, owing to the leakage of metals, anions, and organic compounds. The geochemical monitoring of water resources is therefore extremely important, since the leachate can compromise the quality and use of surface water and groundwater close to landfills. In this paper, the results of analyses of metals, anions, ammonia, and physicochemical parameters were used to identify possible contamination of surface water and groundwater in a landfill area. A statistical multivariate approach was used. The values found for alkali metals, nitrate, and chloride indicate contamination in the regional groundwater and, moreover, surface waters also show variation when compared to the other background points, mainly for ammonia. Thus, the results of this study evidence the landfill leachate influence on the quality of groundwater and surface water in the study area.
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Affiliation(s)
- Pâmela de Medeiros Engelmann
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - Victor Hugo Jacks Mendes Dos Santos
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - Letícia Isabela Moser
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - Eduardo do Canto Bruzza
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | | | - Pâmela Susin Barela
- Institute of Chemistry, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, Brazil
| | - Diogo Pompéu de Moraes
- Institute of Chemistry, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, 91501-970, Brazil
| | - Adolpho Herbert Augustin
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - Flávio Soares Goudinho
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - Clarissa Lovato Melo
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - João Marcelo Medina Ketzer
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil
| | - Luiz Frederico Rodrigues
- Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga, 6681, Building 96J, Porto Alegre, 90619-900, Brazil.
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106
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Frikha Y, Fellner J, Zairi M. Leachate generation from landfill in a semi-arid climate: A qualitative and quantitative study from Sousse, Tunisia. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2017; 35:940-948. [PMID: 28687064 DOI: 10.1177/0734242x17715102] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Despite initiatives for enhanced recycling and waste utilization, landfill still represents the dominant disposal path for municipal solid waste (MSW). The environmental impacts of landfills depend on several factors, including waste composition, technical barriers, landfill operation and climatic conditions. A profound evaluation of all factors and their impact is necessary in order to evaluate the environmental hazards emanating from landfills. The present paper investigates a sanitary landfill located in a semi-arid climate (Tunisia) and highlights major differences in quantitative and qualitative leachate characteristics compared to landfills situated in moderate climates. Besides the qualitative analysis of leachate samples, a quantitative analysis including the simulation of leachate generation (using the HELP model) has been conducted. The results of the analysis indicate a high load of salts (Cl, Na, inorganic nitrogen) in the leachate compared to other landfills. Furthermore the simulations with HELP model highlight that a major part of the leachate generated originates form the water content of waste.
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Affiliation(s)
- Youssef Frikha
- 1 Laboratory LR 3E, National Engineering School of Sfax, Tunisia
| | - Johann Fellner
- 2 Institute for Water Quality, Resources and Waste Management, Vienna University of Technology, Austria
| | - Moncef Zairi
- 1 Laboratory LR 3E, National Engineering School of Sfax, Tunisia
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107
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Yuan Z, He C, Shi Q, Xu C, Li Z, Wang C, Zhao H, Ni J. Molecular Insights into the Transformation of Dissolved Organic Matter in Landfill Leachate Concentrate during Biodegradation and Coagulation Processes Using ESI FT-ICR MS. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:8110-8118. [PMID: 28628308 DOI: 10.1021/acs.est.7b02194] [Citation(s) in RCA: 172] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Landfill leachate concentrate is a type of refractory organic wastewater with high environmental risk. Identification of refractory components and insights into the molecular transformations of the organics are essential for the development of efficient treatment process. In this report, molecular compositions of dissolved organic matter (DOM) in leachate concentrate, as well as changes after anaerobic/aerobic biodegradation and coagulation with salts, were characterized using electrospray ionization (ESI) coupled with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). DOM in leachate concentrate were more saturated and less oxidized with more nitrogen and sulfur-containing substances (accounting for 50.0%), comparing with natural organic matter in Suwannee River. Selectivity for different classes of organics during biodegradation and coagulation processes was observed. Substances with low oxidation degree (O/C < 0.3) were more reactive during biodegradation process, leading to the formation of highly oxidized molecules (O/C > 0.5). Unsaturated (H/C < 1.0) and oxidized (O/C > 0.4) substances containing carboxyl groups were preferentially removed after coagulation with Al or Fe sulfate. The complementary functions of biodegradation and coagulation in the treatment of DOM in leachate concentrate were verified at the molecular level. Lignin-derived compounds and sulfur-containing substances in leachate concentrate were resistant to biodegradation and coagulation treatments. To treat leachate concentrate more effectively, processes aimed at removal of such DOM should be developed.
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Affiliation(s)
- Ziwen Yuan
- Department of Environmental Engineering, Peking University , Beijing 100871, China
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Chen He
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
| | - Quan Shi
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
| | - Chunming Xu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Beijing 102249, China
| | - Zhenshan Li
- Department of Environmental Engineering, Peking University , Beijing 100871, China
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Chengzhai Wang
- Department of Environmental Engineering, Peking University , Beijing 100871, China
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Huazhang Zhao
- Department of Environmental Engineering, Peking University , Beijing 100871, China
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Jinren Ni
- Department of Environmental Engineering, Peking University , Beijing 100871, China
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
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108
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Alabiad I, Ali UFM, Zakarya IA, Ibrahim N, Radzi RW, Zulkurnai NZ, Azmi NH. Ammonia removal via microbial fuel cell (MFC) dynamic reactor. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1757-899x/206/1/012079] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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109
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Li G, Chen J, Yan W, Sang N. A comparison of the toxicity of landfill leachate exposure at the seed soaking and germination stages on Zea mays L. (maize). J Environ Sci (China) 2017; 55:206-213. [PMID: 28477815 DOI: 10.1016/j.jes.2016.06.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 06/06/2016] [Accepted: 06/30/2016] [Indexed: 05/11/2023]
Abstract
To compare the toxicity of landfill leachate exposure at the early stages of seed soaking and germination on maize, a field experiment was conducted to evaluate the physiological aspects of growth, yield and potential clastogenicity of root-tip cells. The maizes were treated with leachate at levels of 2%, 10%, 20%, 30% or 50% (V/V). First, the change of physiological indexes, including chlorophyll (Chl), Malondialdehyde (MDA) and Reactive oxygen species (ROS) levels, combined with yield all showed that soaking with leachate, but not germination, generated a greater ecological risk on maize. After a soaking treatment of maize with 50% leachate, the Chl, MDA and ROS levels during a vigorous growth period were 47.3%, 149.8% and 309.7%, respectively, of the control, whereas the yield decreased to 68.6% of the control. In addition, our results demonstrated that the leachate at lower levels could promote growth. This is mainly embodied in that the yield of maize treated with 10% leachate at the soaking stage increased to 116.0% of the control. Moreover, the cytological analysis experiment also demonstrated that the ecological risk of leachate still exists in both cases. Furthermore, the gray relational analysis showed that the ear row number and tassel branch number were the major factors affecting the yield of maize treated with 50% leachate at the stages of soaking and germination, respectively. In general, these results are helpful in understanding the phytotoxicity of leachate, which provides additional reference data for risk assessment and management of leachate.
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Affiliation(s)
- Guangke Li
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
| | - Junyan Chen
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China
| | - Wei Yan
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China
| | - Nan Sang
- College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
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110
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Baccot C, Pallier V, Feuillade-Cathalifaud G. Biochemical methane potential of fractions of organic matter extracted from a municipal solid waste leachate: Impact of their hydrophobic character. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 63:257-266. [PMID: 27931936 DOI: 10.1016/j.wasman.2016.11.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 09/08/2016] [Accepted: 11/17/2016] [Indexed: 06/06/2023]
Abstract
Many data on anaerobic digestion (AD) and co-digestion of municipal solid waste leachate (MSWL) are already available in literature. They mainly deal with its performances to decrease the chemical oxygen demand (COD) of MSWL and no information is given on the impact of the specific characteristics of the dissolved organic matter (DOM) in leachate on these performances. DOM in leachate evolves towards more aromatic and hydrophobic compounds during landfilling with increasing specific ultra-violet absorbance index (SUVA) and hydrophobic character. However, according to the humification stages, this DOM would not present the same aptitude for AD. This research thus focused on (i) optimizing a biochemical methane potential (BMP) test applied to MSWL by using the Taguchi method and (ii) evaluating the impact of the hydrophobic character of the DOM in leachate on the BMP of MSWL to finally define the humification degree more suitable for AD. Hydrophobic-like (HPO∗) and transphilic-like (TPH∗) compounds extracted from leachate by a fractionation protocol were tested because of their high content in MSWL during acetogenesis and methanogenesis steps. After 275days of AD, the content in hydrophobic compounds and the SUVA indexes increased in the digestates. Moreover, even if the biogas and methane productions were not significantly different during the whole tests (4072±350mLgDOC-1 and 2370±95mLgDOC-1 respectively), the volume of biogas produced directly correlated with the TPH∗ fraction content in the initial digestates. On the contrary, the methane percentage in biogas was anti-correlated with the hydrophilic-like compounds content. The hydrophobic-like molecules seem thus not to be directly involved in the methanogenic step, however they promote the increase of the methane percent in the biogas.
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Affiliation(s)
- Camille Baccot
- Research Group on Water Soil and Environment (GRESE), University of Limoges, ENSIL, ESTER Technopole, 16 rue Atlantis, 87068 Limoges Cedex, France
| | - Virginie Pallier
- Research Group on Water Soil and Environment (GRESE), University of Limoges, ENSIL, ESTER Technopole, 16 rue Atlantis, 87068 Limoges Cedex, France
| | - Geneviève Feuillade-Cathalifaud
- Research Group on Water Soil and Environment (GRESE), University of Limoges, ENSIL, ESTER Technopole, 16 rue Atlantis, 87068 Limoges Cedex, France.
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111
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Ye M, Sun M, Chen X, Feng Y, Wan J, Liu K, Tian D, Liu M, Wu J, Schwab AP, Jiang X. Feasibility of sulfate-calcined eggshells for removing pathogenic bacteria and antibiotic resistance genes from landfill leachates. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 63:275-283. [PMID: 28343745 DOI: 10.1016/j.wasman.2017.03.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/01/2017] [Accepted: 03/03/2017] [Indexed: 06/06/2023]
Abstract
High abundance of human pathogen and antibiotic resistance genes (ARGs) in landfill leachate has become an emerging threat against human health. Therefore, sulfate- and calcination-modified eggshells as green agricultural bioresource were applied to test the feasibility of removing pathogenic bacteria and ARGs from leachate. The highest removal of Escherichia coli (E. coil) and gentamycin resistant gene (gmrA) from artificial contaminated landfill leachate was achieved by the application of eggshell with combined treatment of sulfate and calcination. The 16S and gmrA gene copies of E. coil declined significantly from 1.78E8±8.7E6 and 4.12E8±5.9E6 copies mL-1 to 1.32E7±2.6E6 and 2.69E7±7.2E6 copies mL-1, respectively, within 24h dynamic adsorption equilibrium process (p<0.05). Moreover, according to the Langmuir kinetic model, the greatest adsorption amount (1.56×109 CFU E. coil per gram of modified eggshells) could be obtained at neutral pH of 7.5. The optimal adsorption eggshells were then screened to the further application in three typical landfill leachates in Nanjing, eastern China. Significant decrease in species and abundance of pathogenic bacteria and ARGs (tet, sul, erm, qnr, and ampC) indicated its great efficiency to purify landfill leachates. This study demonstrated that sulfate-calcined eggshells can be an environmentally-friendly and highly efficient bioadsorbent to the management of reducing dissemination risk of pathogen and ARGs in landfill leachate.
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Affiliation(s)
- Mao Ye
- Key Laboratory of Soil Environmental and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; Department of Civil Engineering, University of Nebraska-Lincoln, 844 North 16th Street, Lincoln, NE 68588-6105, United States.
| | - Mingming Sun
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China; Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 88743, USA
| | - Xu Chen
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Yanfang Feng
- Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, PR China
| | - Jinzhong Wan
- Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing 210042, PR China
| | - Kuan Liu
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Da Tian
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Manqiang Liu
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Jun Wu
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Arthur P Schwab
- Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 88743, USA
| | - Xin Jiang
- Key Laboratory of Soil Environmental and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
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112
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Kattel E, Dulova N. Ferrous ion-activated persulphate process for landfill leachate treatment: removal of organic load, phenolic micropollutants and nitrogen. ENVIRONMENTAL TECHNOLOGY 2017; 38:1223-1231. [PMID: 27564134 DOI: 10.1080/09593330.2016.1221472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 08/02/2016] [Indexed: 06/06/2023]
Abstract
The innovative [Formula: see text] treatment technology based on sulphate radicals induced oxidation was applied for the treatment of landfill leachate. The performance of chemical oxygen demand (COD) and dissolved organic carbon (DOC) removal in the Fe2+-activated persulphate system was moderate; however, the results of dissolved nitrogen (DN) and total phenols removal showed significant efficacy (≤39% and ≥87%, respectively). [Formula: see text] addition to the [Formula: see text] system enhanced the treatment efficacy and resulted in supplementary 15% of COD and 5% of DN removal. Hydroxyl radical-based H2O2/Fe2+ treatment of the landfill leachate was performed as well; the results indicated higher removal efficacy of COD and DOC compared to the [Formula: see text] system. However, practical application of the H2O2/Fe2+ system is considerably influenced by temperature rise and excessive foam formation. Generally, the ferrous ion-activated persulphate treatment could be a promising technology for ex situ as well as in situ landfill leachate treatment applications.
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Affiliation(s)
- Eneliis Kattel
- a Department of Chemical Engineering , Tallinn University of Technology , Ehitajate tee 5, Tallinn , Estonia
| | - Niina Dulova
- a Department of Chemical Engineering , Tallinn University of Technology , Ehitajate tee 5, Tallinn , Estonia
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113
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Wang HW, Li XY, Hao ZP, Sun YJ, Wang YN, Li WH, Tsang YF. Transformation of dissolved organic matter in concentrated leachate from nanofiltration during ozone-based oxidation processes (O 3, O 3/H 2O 2 and O 3/UV). JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 191:244-251. [PMID: 28113066 DOI: 10.1016/j.jenvman.2017.01.021] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 12/21/2016] [Accepted: 01/11/2017] [Indexed: 06/06/2023]
Abstract
In this study, the transformation of dissolved organic matter (DOM) in nanofiltration concentrated leachate during three ozone-based oxidation processes (i.e., O3, O3/H2O2 and O3/UV) was investigated. The transformation characteristics of DOM were evaluated by gel filtration chromatography (GFC), XAD-8 resin fractionation, excitation-emission matrix fluorescence spectroscopy (EEM) and Fourier transform infrared spectroscopy (FTIR). Compared with O3-alone process, the removal efficiencies of COD, TOC, and color were improved in O3-combined processes (i.e., O3/H2O2 and O3/UV) approximately by 10-15%, 7-15%, and 15-20%, respectively. Humic acid (HA) was completely degraded and preferentially reacted with the oxidants during ozonation processes. HA was first converted into fulvic acid (FA), and then the majority of these intermediates were further converted to hydrophilic fraction (HyI). The GFC results indicated that the broader molecular weight distribution of DOM was observed, and high molecular weight DOM (i.e., 0.45 μm-100 kDa) was successfully converted to low molecular weight organics in the range of 1-10 kDa after ozonation reactions. The EEM spectra also showed that HA and FA were effectively converted into HyI after ozonation for 90 min. It is suggested that ozone-based oxidation processes could effectively change the DOM distribution and fluorescence features of concentrated leachate.
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Affiliation(s)
- Hua-Wei Wang
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, PR China
| | - Xiao-Yue Li
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China
| | - Zhi-Peng Hao
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China
| | - Ying-Jie Sun
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China
| | - Ya-Nan Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China.
| | - Wei-Hua Li
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, Hong Kong.
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114
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Xu J, Long Y, Shen D, Feng H, Chen T. Optimization of Fenton treatment process for degradation of refractory organics in pre-coagulated leachate membrane concentrates. JOURNAL OF HAZARDOUS MATERIALS 2017; 323:674-680. [PMID: 27776851 DOI: 10.1016/j.jhazmat.2016.10.031] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/10/2016] [Accepted: 10/14/2016] [Indexed: 06/06/2023]
Abstract
Untreated leachate membrane concentrates are a threat to the environment. In our study, effective removal of contaminants in pre-coagulated leachate membrane concentrates was achieved using the Fenton process. The Fenton process was optimized using the response surface method, and the maximum total organic carbon (TOC), chemical oxygen demand (COD), and chromaticity reduction efficiencies reached 68.9%, 69.6%, and 100% under the conditions pH 2, H2O2 concentration 1mol/L, and Fe2+ concentration 17.5mmol/L. The COD concentration was reduced from 1120 to 340mg/L. The H2O2 concentration was the key factor affecting the TOC removal efficiency. Slow, continuous addition of the Fenton reagents improved the H2O2 utilization rate, which improved the TOC removal efficiency. Fourier-transform infrared and three-dimensional fluorescence spectroscopy showed that the majority compound of the removed organic material was humic acid. Our study provides guidelines for the treatment of leachate membrane concentrates in engineering applications.
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Affiliation(s)
- Jing Xu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Yuyang Long
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Dongsheng Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Huajun Feng
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Ting Chen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
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115
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Long Y, Xu J, Shen D, Du Y, Feng H. Effective removal of contaminants in landfill leachate membrane concentrates by coagulation. CHEMOSPHERE 2017; 167:512-519. [PMID: 27764744 DOI: 10.1016/j.chemosphere.2016.10.016] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/28/2016] [Accepted: 10/04/2016] [Indexed: 06/06/2023]
Abstract
Leachate membrane concentrates containing high concentrations of organics and trace toxic compounds pose a major threat to the environment, and their treatment is an urgent issue. In this work, various coagulants were used to treat leachate membrane concentrates. Appropriate pH values for treatments with FeCl2, FeSO4, polyaluminum chloride, and FeCl3 were 3, 5, 5, and 4, respectively. FeCl3 achieved the highest total organic carbon (TOC) removal efficiency. The effect of the various anions in ferric coagulants [FeCl3, Fe2(SO4)3, and Fe(NO3)3] on the TOC removal efficiency was negligible. The main organics remaining in the leachate membrane concentrates after coagulation were humic and fulvic acids. The conditions for coagulation with FeCl3 were optimized using the response surface method (RSM). The highest TOC, chemical oxygen demand (COD), and chromaticity reduction efficiencies, 81%, 82%, and 97%, respectively, were achieved at pH 4 using FeCl3 (5 g L-1) and polyacrylamide (PAM; 0.07 g L-1). The COD of leachate membrane concentrates was reduced from 4000 to 718 mg L-1. The mole ratio of removed COD and Fe(III) (2.4 mol) at 5 g L-1 FeCl3 (pH 4, PAM 0.07 g L-1) was lower than that (3.8 mol) at 3 g L-1 FeCl3 (pH 4, PAM 0.07 g L-1); based on the cost and COD removal efficiency, the latter conditions were the best choice. Our work provides guidelines for the treatment of leachate membrane concentrates in engineering.
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Affiliation(s)
- Yuyang Long
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Jing Xu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Dongsheng Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Yao Du
- Zhejiang Zone-King Environmental Science and Technology Co., Ltd., 7F Zhejiang Sanli Times Square, No. 536 Shaoxin Road, Hangzhou 310013, China
| | - Huajun Feng
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
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116
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Shehzad A, Bashir MJ, Sethupathi S, Lim JW. Simultaneous Removal of Organic and Inorganic Pollutants From Landfill Leachate Using Sea Mango Derived Activated Carbon via Microwave Induced Activation. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2016. [DOI: 10.1515/ijcre-2015-0145] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The present work reveals the preparation and optimization of sea mango based activated carbon (SMAC) by microwave induced KOH activation for the adsorptive removal of organic and inorganic contaminants from the mature anaerobic landfill leachate using response surface methodology (RSM) technique. Chemical oxygen demand (COD) and ammoniacal nitrogen (NH3-N) are the main indicators for organic and inorganic compounds often found in aged landfill leachate. Hence, the treatment of this stabilized landfill leachate is considered to be an essential step prior to its discharge. The leachate sample was collected from Sahom Landfill site in Perak, Malaysia and the initial concentrations of COD and NH3-N were measured as 550 mg/L and 3,330 mg/L, respectively. The feasibility of converting Sea mango to activated carbon process to remove the COD and NH3-N pollutants from landfill leachate was investigated. The preparation conditions such as microwave heating at power range (350–600 W), impregnation of AC with KOH (0.5–3.0) and retention time (6–10 min) were evaluated, analyzed and optimized using response surface methodology (RSM). From the analysis of variance (ANOVA), the optimum conditions for preparation of SMAC was at 560 W of activation power, 8.4 min of activation time and 2.10 of impregnation ratios with higher adsorptive removal of COD (72.50 %), and NH3-N (79.77 %), respectively. The physical and chemical properties of SMAC were evaluated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and surface area. The findings exemplified the applicability of SMAC as an effective precursor for the simultaneous removal of organic and inorganic pollutants from mature landfill leachate.
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117
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Morello L, Cossu R, Raga R, Pivato A, Lavagnolo MC. Recirculation of reverse osmosis concentrate in lab-scale anaerobic and aerobic landfill simulation reactors. WASTE MANAGEMENT (NEW YORK, N.Y.) 2016; 56:262-270. [PMID: 27475866 DOI: 10.1016/j.wasman.2016.07.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 07/05/2016] [Accepted: 07/23/2016] [Indexed: 06/06/2023]
Abstract
Leachate treatment is a major issue in the context of landfill management, particularly in view of the consistent changes manifested over time in the quality and quantity of leachate produced, linked to both waste and landfill characteristics, which renders the procedure technically difficult and expensive. Leachate recirculation may afford a series of potential advantages, including improvement of leachate quality, enhancement of gas production, acceleration of biochemical processes, control of moisture content, as well as nutrients and microbe migration within the landfill. Recirculation of the products of leachate treatment, such as reverse osmosis (RO) concentrate, is a less common practice, with widespread controversy relating to its suitability, potential impacts on landfill management and future gaseous and leachable emissions. Scientific literature provides the results of only a few full-scale applications of concentrate recirculation. In some cases, an increase of COD and ammonium nitrogen in leachate was observed, coupled with an increase of salinity; which, additionally, might negatively affect performance of the RO plant itself. In other cases, not only did leachate production not increase significantly but the characteristics of leachate extracted from the well closest to the re-injection point also remained unchanged. This paper presents the results of lab-scale tests conducted in landfill simulation reactors, in which the effects of injection of municipal solid waste (MSW) landfill leachate RO concentrate were evaluated. Six reactors were managed with different weekly concentrate inputs, under both anaerobic and aerobic conditions, with the aim of investigating the short and long-term effects of this practice on landfill emissions. Lab-scale tests resulted in a more reliable identification of compound accumulation and kinetic changes than full-scale applications, further enhancing the development of a mass balance in which gaseous emissions and waste characteristics were also taken into consideration. Results showed that RO concentrate recirculation did not produce consistent changes in COD emissions and methane production. Simultaneously, ammonium ion showed a consistent increase in leachate (more than 25%) in anaerobic reactors, free ammonia gaseous emissions doubled with concentrate injection, while chloride resulted accumulated inside the reactor.
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Affiliation(s)
- Luca Morello
- ICEA, Department of Civil, Architectural and Environmental Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
| | - Raffaello Cossu
- DII, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
| | - Roberto Raga
- DII, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
| | - Alberto Pivato
- DII, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
| | - Maria Cristina Lavagnolo
- DII, Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
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118
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Wang H, Wang YN, Li X, Sun Y, Wu H, Chen D. Removal of humic substances from reverse osmosis (RO) and nanofiltration (NF) concentrated leachate using continuously ozone generation-reaction treatment equipment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2016; 56:271-279. [PMID: 27478023 DOI: 10.1016/j.wasman.2016.07.040] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2016] [Revised: 07/26/2016] [Accepted: 07/26/2016] [Indexed: 06/06/2023]
Abstract
Concentrated leachate from membrane treatment process, which contains large amount of difficult-to-degrade humic substances, can induce potential hazards to ecological environment. In this study, the concentrated leachates from reverse osmosis (RO) and nanofiltration (NF) were treated by continuous ozone generating-reaction integrated equipment, and the removal characteristics of humic substances were analyzed using gel filtration chromatography (GFC), excitation-emission matrix fluorescence spectroscopy (EEM), XAD-8 resin fractionation, and Fourier transform infrared spectroscopy (FTIR). The results of XRD-8 fractionation and SUVA254 showed that the humic substances including humic acid (HA) and fulvic acid (FA), were effectively removed along with the breakdown of aromatic hydrocarbons and decrease in the degree of humification during the ozonation process. After 110min of reaction, HA in both concentrated leachates was completely removed. GFC analysis indicated that both concentrated leachates had much broader distribution after the degradation. The high molecular weight (MW) organic matter was transformed into low molecular weight of <10kDa. The majority of high MW organics in NF concentrate were converted to low MW molecules of 10kDa-1kDa, while those in RO concentrate were decomposed to small MW molecules of <1kDa. The results of EEM analysis implied that the degradation of HA and FA led to a significant decrease in the fluorescence intensity. Though the effluent of two concentrated leachate did not meet the maximum allowable criterion for leachate direct or indirect discharge standard in China, the composition and properties of organic matters in concentrated leachate were changed significantly after entire ozonation reaction, which would be conducive to the further biological treatment or other advanced treatment.
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Affiliation(s)
- Huawei Wang
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China; Xinjiang Key Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, PR China
| | - Ya-Nan Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
| | - Xiaoyue Li
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China
| | - Yingjie Sun
- College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China.
| | - Hao Wu
- Comprehensive Office of Jiaodong International Airport and Airport Economic Zone, Qingdao 266300, PR China
| | - Dali Chen
- Qingdao ODO Environmental Science and Technology Development Co. Ltd, Qingdao 266555, PR China
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119
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Zolfaghari M, Droguia P, Brar SK, Buelna G, Dubé R. Effect of bioavailability on the fate of hydrophobic organic compounds and metal in treatment of young landfill leachate by membrane bioreactor. CHEMOSPHERE 2016; 161:390-399. [PMID: 27448320 DOI: 10.1016/j.chemosphere.2016.07.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 06/28/2016] [Accepted: 07/06/2016] [Indexed: 06/06/2023]
Abstract
Complex dissolved organic matter (DOM) present in landfill leachate provides reliable media for adsorption of highly hydrophobic contaminants, such as Di 2-ethyl hexyl phthalate (DEHP). In this research, the feasibility of submerged membrane bioreactor (SMBR) for treatment of landfill leachate (LFL) was determined. Later, the operating conditions were optimized for removal of DEHP, COD, NH4(+) and PO4(3-), and finally the effect of bioavailability was examined by introduction of different concentrations of humic acid into the influent. The result revealed that presence of complex agglomerated organic compounds increased the removal efficiency of DEHP and COD, even though DEHP biodegradation rate in sludge dramatically decreased (from 58.8% to 12.8%). MBR retention of different metals in the absence and in the presence of recalcitrant DOM was also studied. Like DEHP, ternary interaction between metals, DOM, and sludge play a pivotal role in their removal efficiency and their concentration in sludge.
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Affiliation(s)
- M Zolfaghari
- Institut National de la Recherche Scientifique-Eau, Terre et Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada
| | - P Droguia
- Institut National de la Recherche Scientifique-Eau, Terre et Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada.
| | - S K Brar
- Institut National de la Recherche Scientifique-Eau, Terre et Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Québec, QC, G1K 9A9, Canada
| | - G Buelna
- Centre de Recherche Industrielle du Québec (CRIQ), 333 rue Franquet, Québec, QC, G1P 4C7, Canada
| | - R Dubé
- Centre de Recherche Industrielle du Québec (CRIQ), 333 rue Franquet, Québec, QC, G1P 4C7, Canada
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120
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Chen H, Sun Y, Ruan X, Yu Y, Zhu M, Zhang J, Zhou J, Xu Y, Liu J, Qian G. Advanced treatment of stabilized landfill leachate after biochemical process with hydrocalumite chloride (Ca/Al-Cl LDH). BIORESOURCE TECHNOLOGY 2016; 210:131-137. [PMID: 26920626 DOI: 10.1016/j.biortech.2016.01.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 01/13/2016] [Accepted: 01/14/2016] [Indexed: 06/05/2023]
Abstract
This study investigated the effectiveness of Ca/Al-Cl LDH for the treatment of stabilized landfill leachate. Experiments were performed including different dosage of Ca/Al-Cl LDH and comparison with different reagents, such as CaCl2 and AlCl3. As a result, Ca/Al-Cl LDH efficiently removed organic matters in stabilized landfill leachate with the maximum removal (59.41% COD, 62.06% DOC and 70.56% UV254) at the dose of 30g/L. According to UV254 and EEM, it is remarkable that the formation of Ca/Al-LDH has a greater beneficial to organic removal than other reagents, especially for fulvic acid-like and humic acid-like compounds. Moreover, the removal of fulvic acid-like compounds was much better than humic acid-like compounds. The previous compounds had more carboxylic groups, thus had a better removal selectivity.
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Affiliation(s)
- Hua Chen
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Ying Sun
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Xiuxiu Ruan
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Ying Yu
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Minying Zhu
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Jia Zhang
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Jizhi Zhou
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Yunfeng Xu
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Jianyong Liu
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China
| | - Guangren Qian
- School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, PR China.
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121
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Wang G, Lu G, Yin P, Zhao L, Yu QJ. Genotoxicity assessment of membrane concentrates of landfill leachate treated with Fenton reagent and UV-Fenton reagent using human hepatoma cell line. JOURNAL OF HAZARDOUS MATERIALS 2016; 307:154-162. [PMID: 26780702 DOI: 10.1016/j.jhazmat.2015.12.069] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 12/29/2015] [Accepted: 12/31/2015] [Indexed: 06/05/2023]
Abstract
Membrane concentrates of landfill leachates contain organic and inorganic contaminants that could be highly toxic and carcinogenic. In this paper, the genotoxicity of membrane concentrates before and after Fenton and UV-Fenton reagent was assessed. The cytotoxicity and genotoxicity was determined by using the methods of methyltetrazolium (MTT), cytokinesis-block micronucleus (CBMN) and comet assay in human hepatoma cells. MTT assay showed a cytotoxicity of 75% after 24h of exposure to the highest tested concentration of untreated concentrates, and no cytotoxocity for UV-Fenton and Fenton treated concentrates. Both CBMN and comet assays showed increased levels of genotoxicity in cells exposed to untreated concentrates, compared to those occurred in cells exposed to UV-Fenton and Fenton reagent treated concentrates. There was no significant difference between negative control and UV-Fenton treated concentrates for micronucleus and comet assay parameters. UV-Fenton and Fenton treatment, especially the former, were effective methods for degradation of bisphenol A and nonylphenol in concentrates. These findings showed UV-Fenton and Fenton reaction were effective methods for treatment of such complex concentrates, UV-Fenton reagent provided toxicological safety of the treated effluent, and the genotoxicity assays were found to be feasible tools for assessment of toxicity risks of complex concentrates.
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Affiliation(s)
- Guifang Wang
- Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China
| | - Gang Lu
- Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, Department of Environmental Engineering, Jinan University, Guangzhou 510632, People's Republic of China
| | - Pinghe Yin
- Research Center of Analysis and Test, Jinan University, Guangzhou 510632, People's Republic of China.
| | - Ling Zhao
- Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, Department of Environmental Engineering, Jinan University, Guangzhou 510632, People's Republic of China.
| | - Qiming Jimmy Yu
- Griffith School of Engineering, Griffith University, Nathan Campus, Brisbane, Queensland 4111, Australia
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122
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Lee S, Hur J. Heterogeneous adsorption behavior of landfill leachate on granular activated carbon revealed by fluorescence excitation emission matrix (EEM)-parallel factor analysis (PARAFAC). CHEMOSPHERE 2016; 149:41-48. [PMID: 26849193 DOI: 10.1016/j.chemosphere.2016.01.081] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 01/19/2016] [Accepted: 01/20/2016] [Indexed: 06/05/2023]
Abstract
Heterogeneous adsorption behavior of landfill leachate on granular activated carbon (GAC) was investigated by fluorescence excitation-emission matrix (EEM) combined with parallel factor analysis (PARAFAC). The equilibrium adsorption of two leachates on GAC was well described by simple Langmuir and Freundlich isotherm models. More nonlinear isotherm and a slower adsorption rate were found for the leachate with the higher values of specific UV absorbance and humification index, suggesting that the leachate containing more aromatic content and condensed structures might have less accessible sites of GAC surface and a lower degree of diffusive adsorption. Such differences in the adsorption behavior were found even within the bulk leachate as revealed by the dissimilarity in the isotherm and kinetic model parameters between two identified PARAFAC components. For both leachates, terrestrial humic-like fluorescence (C1) component, which is likely associated with relatively large sized and condensed aromatic structures, exhibited a higher isotherm nonlinearity and a slower kinetic rate for GAC adsorption than microbial humic-like (C2) component. Our results were consistent with size exclusion effects, a well-known GAC adsorption mechanism. This study demonstrated the promising benefit of using EEM-PARAFAC for GAC adsorption processes of landfill leachate through fast monitoring of the influent and treated leachate, which can provide valuable information on optimizing treatment processes and predicting further environmental impacts of the treated effluent.
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Affiliation(s)
- Sonmin Lee
- Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea
| | - Jin Hur
- Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea.
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Li J, Zhao L, Qin L, Tian X, Wang A, Zhou Y, Meng L, Chen Y. Removal of refractory organics in nanofiltration concentrates of municipal solid waste leachate treatment plants by combined Fenton oxidative-coagulation with photo--Fenton processes. CHEMOSPHERE 2016; 146:442-449. [PMID: 26741550 DOI: 10.1016/j.chemosphere.2015.12.069] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 12/14/2015] [Accepted: 12/19/2015] [Indexed: 06/05/2023]
Abstract
Removal of the refractory organic matters in leachate brines generated from nanofiltration unit in two full-scale municipal solid waste landfill leachate treatment plants was investigated by Fenton oxidative-coagulation and ultraviolet photo - Fenton processes in this study. Fenton oxidative-coagulation was performed under the condition of an initial pH of 5.0 and low H2O2/Fe(2+) ratios. After precipitate separation, the remaining organic constituents were further oxidized by photo - Fenton process. For both leachate brines with varying pollution strength, more than 90% COD and TOC reductions were achieved at H2O2/Fe(2+) dosages of 35 mM/8 mM and 90 mM/10 mM, respectively. The effluent COD ranged 120-160 mg/L under the optimal operating conditions, and the biodegradability was increased significantly. Fenton oxidative-coagulation was demonstrated to contribute nearly 70% overall removal of organic matters. In the combined processes, the efficiency of hydrogen peroxide varied from 216 to 228%, which may significantly reduce the operating cost of conventional Fenton method. Six phthalic acid esters and thirteen polycyclic aromatic hydrocarbons were found in leachate brines, and, on the average, around 80% phthalic acid esters and 90% polycyclic aromatic hydrocarbons were removed by the combined treatments.
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Affiliation(s)
- Jiuyi Li
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China
| | - Lei Zhao
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China
| | - Lele Qin
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China
| | - Xiujun Tian
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China
| | - Aimin Wang
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China
| | - Yanmei Zhou
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Beijing Jiaotong University, Beijing 100044, China.
| | - Liao Meng
- Xiaping Municipal Solid Waste Landfill Plant, Shenzhen 518000, Guangdong Province, China
| | - Yong Chen
- China Construction Technology Consulting Co. LTD Beijing 100044, China
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He R, Wei XM, Chen M, Su Y, Tian BH. Effects of concentrated leachate injection modes on stabilization of landfilled waste. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:3333-3341. [PMID: 26490908 DOI: 10.1007/s11356-015-5554-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/05/2015] [Indexed: 06/05/2023]
Abstract
Injection of concentrated leachate to landfills is a simple and cost-effective technology for concentrated leachate treatment. In this study, the effects of injection mode of concentrated leachate and its hydraulic loading rate on the stabilization of landfilled waste were investigated. Compared with the injection of concentrated leachate, the joint injection of leachate and concentrated leachate (1:1, v/v) was more beneficial to the degradation of landfilled waste and mitigated the discharge amount of pollutants at the hydraulic loading rate of 5.9 L m(-2) day(-1). As the hydraulic loading rate of the joint injection of leachate and concentrated leachate was increased from 5.9 to 17.6 L m(-2) day(-1), the organic matter, biologically degradable matter, and total nitrogen of landfilled waste were degraded more rapidly, with the degradation constant of the first-order kinetics of 0.005, 0.004, and 0.003, respectively. Additionally, NO2(-)-N and NO3(-)-N in the concentrated leachate could be well removed in the landfill bioreactors. These results showed that a joint injection of concentrated leachate and raw leachate might be a good way to relieve the inhibitory effect of high concentrations of toxic pollutants in the concentrated leachate and accelerate the stabilization of landfilled waste.
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Affiliation(s)
- Ruo He
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China.
| | - Xiao-Meng Wei
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China
| | - Min Chen
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China
| | - Yao Su
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China
| | - Bao-Hu Tian
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China
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125
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Hu L, Zeng G, Chen G, Dong H, Liu Y, Wan J, Chen A, Guo Z, Yan M, Wu H, Yu Z. Treatment of landfill leachate using immobilized Phanerochaete chrysosporium loaded with nitrogen-doped TiO₂ nanoparticles. JOURNAL OF HAZARDOUS MATERIALS 2016; 301:106-118. [PMID: 26355412 DOI: 10.1016/j.jhazmat.2015.08.060] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 08/28/2015] [Accepted: 08/29/2015] [Indexed: 06/05/2023]
Abstract
This study investigated the performance of immobilized Phanerochaete chrysosporium loaded with nitrogen-doped TiO2 nanoparticles in the treatment of raw landfill leachate with a very low biodegradability ratio (BOD5/COD) of 0.09. The effects of various operating parameters, such as initial chemical oxygen demand (COD) concentration, pH, temperature, and biosorbent dosage, were evaluated with respect to the removal efficiency of total organic carbon (TOC) and ammonia nitrogen (NH3-N). For the immobilized biosorbents, an optimum pH of 6.0 for TOC and 7.0 for NH3-N were found suitable for TOC and NH3-N removal at temperature of 37°C, respectively. The most superior removal efficiencies of TOC and NH3-N of landfill leachate were over 75% and 74% in 72 h at an initial COD concentration of 200 mg L(-1), respectively. In addition, heavy metals were partly removed by the immobilized biosorbents during the process of landfill leachate treatment. The species and mass percentage of organic compounds in landfill leachate after the treatment were found to have considerably declined according to the gas chromatography coupled with mass spectrometry (GC-MS) system. These results indicate that the immobilized P. chrysosporium loaded with nitrogen-doped TiO2 nanoparticles could be a convenient and efficient method for the treatment of landfill leachate.
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Affiliation(s)
- Liang Hu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
| | - Guiqiu Chen
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
| | - Haoran Dong
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Yutang Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Jia Wan
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Anwei Chen
- College of Resources and Environment, Hunan Agricultural University, Changsha, Hunan 410128, PR China
| | - Zhi Guo
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Ming Yan
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Haipeng Wu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
| | - Zhigang Yu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China
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126
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Qin H, Chen H. Pretreatment of concentrated leachate by the combination of coagulation and catalytic ozonation with Ce/AC catalyst. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2016; 73:511-519. [PMID: 26877032 DOI: 10.2166/wst.2015.508] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A raw concentrated leachate produced from membrane bioreactor-nanofiltration (MBR-NF) was taken from Chengdu Chang'an Waste Landfill Site, China. The major fraction of this concentrated leachate was large refractory humic substances. A coagulation-ozonation process was applied to treat this leachate, aiming at enhancing chemical oxygen demand (COD) removal efficiency and increasing its biodegradability. Meanwhile the molecular size distribution of the leachate, before and after coagulation and ozonation treatment, was analyzed by using ultrafiltration membrane separation. Coagulation pretreatment effectively removed varieties of large molecules in the raw concentrated leachate. The addition of Ce/AC greatly improved the oxidative ability of O3 in COD removal in the ozonation of coagulated leachate. The biochemical oxygen demand (BOD5)/COD ratio increased from 0.011 for the untreated concentrated leachate to 0.30 for the effluent of the coagulation-catalytic ozonation process, which indicated that a subsequent biological treatment could be readily conducted. The stability test demonstrated that the Ce/AC catalyst was effective and stable in the catalytic ozonation process. According to the results of molecular size distribution analysis, a direct correlation was observed between the increase of BOD5/COD and the decrease of apparent molecular weight.
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Affiliation(s)
- Hangdao Qin
- College of Material and Chemical Engineering, Tongren University, Tongren 554300, China E-mail:
| | - Honglin Chen
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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127
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He R, Wei XM, Tian BH, Su Y, Lu YL. Characterization of a joint recirculation of concentrated leachate and leachate to landfills with a microaerobic bioreactor for leachate treatment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2015; 46:380-388. [PMID: 26329845 DOI: 10.1016/j.wasman.2015.08.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 07/05/2015] [Accepted: 08/07/2015] [Indexed: 06/05/2023]
Abstract
With comparison of a traditional landfill, a joint recirculation of concentrated leachate and leachate to landfills with or without a microaerobic reactor for leachate treatment was investigated in this study. The results showed that the joint recirculation of concentrated leachate and leachate with a microaerobic reactor for leachate treatment could not only utilize the microaerobic reactor to buffer the fluctuation of quality and quantity of leachate during landfill stabilization, but also reduce the inhibitory effect of acidic pH and high concentrations of ammonium in recycled liquid on microorganisms and accelerate the degradation of landfilled waste. After 390 days of operation, the discharge of COD and total nitrogen (TN) from the landfill with leachate pretreatment by a microaerobic reactor was 7.4 and 0.9 g, respectively, which accounted for 0.7% and 2.6% of COD, 1.9% and 7.5% of the TN discharge from the landfills without recirculation and directly recirculated with leachate and concentrated leachate, respectively. The degradation of the organic matter and biodegradable matter (BDM) in the landfill reactors could fit well with the first-order kinetics. The highest degradation of the organic matter and BDM was observed in the joint recirculation system with a microaerobic reactor for leachate treatment with the degradation constant of the first-order kinetics of 0.001 and 0.002.
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Affiliation(s)
- Ruo He
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
| | - Xiao-Meng Wei
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Bao-Hu Tian
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Yao Su
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Yu-Lan Lu
- Hangzhou Foreign Language School, Hangzhou 310023, China
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128
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Zhang J, Lan S, Niu D, Zhao Y. Decomposition characteristics of humic-like matters with the hollow ellipsoid structure sludge inoculated from decayed soil in mature landfill leachate. ENVIRONMENTAL TECHNOLOGY 2015; 37:672-680. [PMID: 26439631 DOI: 10.1080/09593330.2015.1077273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The organics in mature leachate are mainly humic-like matters, which account for over 80% weight of the total organics. In this work, the microorganisms in decayed soil were found to be capable of decomposing the humic-like matters evidently using an anaerobic-aerobic/anoxic bioprocess in two sequencing bio-reactors. The 3D excitation-emission matrix and Fourier transform infrared (FT-IR) were applied to characterize the variation of dissolved organic matters in mature leachate while sludge morphology was characterized by scanning electron microscopy. The intensities of fluorescence peaks A and C of leachate effluents were 71.66% and 48.75% lower than those of influents, respectively, which indicated the extraordinary degradation ability of microorganisms inoculated from the decayed soil. Meanwhile a kind of distinctive hollow ellipsoid structure sludge organized by tiny soil particles was observed, which might favour the humic-like matters' decomposition and has never been reported before as we know. The formation mechanisms of hollow ellipsoid structure sludge will need further study.
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Affiliation(s)
- Jie Zhang
- a The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai 200092 , China
| | - Sijie Lan
- a The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai 200092 , China
| | - Dongjie Niu
- a The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai 200092 , China
| | - Youcai Zhao
- a The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering , Tongji University , Shanghai 200092 , China
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129
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Yu Y, Chen Z, Guo Z, Liao Z, Yang L, Wang J, Chen Z. Removal of refractory contaminants in municipal landfill leachate by hydrogen, oxygen and palladium: a novel approach of hydroxyl radical production. JOURNAL OF HAZARDOUS MATERIALS 2015; 287:349-55. [PMID: 25679800 DOI: 10.1016/j.jhazmat.2015.01.070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 01/26/2015] [Accepted: 01/30/2015] [Indexed: 05/23/2023]
Abstract
Municipal solid waste (MSW) leachate contains various refractory pollutants that pose potential threats to both surface water and groundwater. This paper established a novel catalytic oxidation process for leachate treatment, in which OH is generated in situ by pumping both H2 and O2 in the presence of Pd catalyst and Fe(2+). Volatile fatty acids in the leachate were removed almost completely by aeration and/or mechanical mixing. In this approach, a maximum COD removal of 56.7% can be achieved after 4h when 200mg/L Fe(2+) and 1250mg/L Pd/Al2O3 (pH 3.0) are used as catalysts. After oxidation, the BOD/COD ratio in the proposed process increased from 0.03 to 0.25, indicating that the biodegradability of the leachate was improved. By comparing the efficiency on COD removal and economical aspect of the proposed Pd-based in-situ process with traditional Fenton, electro-Fenton and UV-Fenton for leachate treatments, the proposed Pd-based in-situ process has potential economic advantages over other advanced oxidation processes while the COD removal efficiency was maintained.
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Affiliation(s)
- Yingjian Yu
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Zhulei Chen
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
| | - Zhiyuan Guo
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Zhuwei Liao
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Lie Yang
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Jia Wang
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Zhuqi Chen
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
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130
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He R, Tian BH, Zhang QQ, Zhang HT. Effect of Fenton oxidation on biodegradability, biotoxicity and dissolved organic matter distribution of concentrated landfill leachate derived from a membrane process. WASTE MANAGEMENT (NEW YORK, N.Y.) 2015; 38:232-239. [PMID: 25660905 DOI: 10.1016/j.wasman.2015.01.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/07/2015] [Accepted: 01/08/2015] [Indexed: 06/04/2023]
Abstract
The treatment of concentrated landfill leachate from membrane process is a troublesome issue due to high concentrations of biorecalcitrant pollutants. In this study, the effect of Fenton process on dissolved organic matter (DOM) distribution (i.e. humic acid (HA), fulvic acid (FA) and hydrophilic fraction (HyI)), chemical forms of toxic organic compounds and metals, and their biotoxicity were investigated. In the concentrated leachate, toluene, ethylbenzene and chlorobenzene predominated in the HyI fraction, while phthalate esters (PAEs) were mainly absorbed on the HA and FA fractions. PAEs were more readily removed from the HA and FA fractions than that from the HyI fraction in the Fenton process. The complexing abilities of DOM varied with types of metal in the concentrated leachate. The biotoxicities of the DOM fractions to luminescent bacteria (Photobacterium phosphoreum T3 mutation) were HA > FA > - HyI. The biotoxicities of the hydrophobic organic contaminants to luminescent bacteria were not obvious in the concentrated leachate due to their low concentrations. Metals might be the main contributor to the biotoxicity to luminous bacteria in the concentrated leachate. These results indicated that Fenton process could influence the pollutants distribution in DOM and their biotoxicities through the breakdown of HA and FA in the concentrated leachate.
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Affiliation(s)
- Ruo He
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
| | - Bao-Hu Tian
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Qi-Qi Zhang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Hong-Tao Zhang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
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131
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Hassan M, Xie B. Use of aged refuse-based bioreactor/biofilter for landfill leachate treatment. Appl Microbiol Biotechnol 2014; 98:6543-53. [DOI: 10.1007/s00253-014-5813-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 05/01/2014] [Accepted: 05/02/2014] [Indexed: 11/28/2022]
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132
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Abstract
Fulvic acid (FA) is a common refractory organic compound in landfill leachate. The degradation of FA in supercritical water oxidation (SCWO) was conducted in a SS 316 batch reactor. The effects of temperature, pressure, residence time, oxidation ratio and initial FA concentration on the degradation of FA were investigated. Results showed that FA could be easily destructed in SCWO process, and a total organic carbon (TOC) removal efficiency of 98.0% was available at 600 °C, 420 s, 25 MPa and 1% FA. Oxidation coefficient had a significant positive effect on the degradation of FA. Total carbon (TC) and TOC removal efficiencies increased from 78.9 % to 97.2 % and from 86.4 % to 97.2, respectively, when oxidation coefficient increased from 0 to 4. Benzene, phenol and naphthalene could be regarded as the intermediate products in SCWO.
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133
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Analysis of Electro-Oxidation Suitability for Landfill Leachate Treatment through an Experimental Study. SUSTAINABILITY 2013. [DOI: 10.3390/su5093960] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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