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Sequential treatment of landfill leachate by electrocoagulation/aeration, PMS/ZVI/UV and electro-Fenton: Performance, biodegradability and toxicity studies
Abstract
This study presents a systematic study on sequential treatment of highly resistant landfill leachate by electrocoagulation (EC)/aeration, sulfate radical advanced oxidation process (SR-AOP) and electro-Fenton (EF). In case of SR-AOP, peroxymonosulfate (PMS) catalyzed by zero valent iron (ZVI) and ultraviolet irradiation (UV) system was developed. Treatment process was optimized in respect to COD removal. Analysis of results revealed that sequential application of EC/aeration, PMS/ZVI/UV, and EF processes provide an extraordinary performance and meet the environmental regulations. The source of iron for EF process was provided from previous process reducing the cost of sequential process. Separately, EC/aeration (inlet COD = 4040 mg/L), PMS/ZVI/UV (inlet COD = 1560 mg/L), and EF (inlet COD = 471 mg/L) removed 61, 69 and 82% of COD respectively. Overall, sequential processes of EC/aeration, PMS/ZVI/UV and EF could remove the COD, TOC and ammonia of the landfill leachate around 98%, 93% and 94%, respectively. The comparison of different sequences of following processes indicated that current configuration (EC/aeration-PMS/ZVI/UV-EF) could meet the discharge standards. Furthermore, humification degree was significantly improved after oxidative processes. Biodegradability study was also performed by means of BOD/COD, average oxidation state (AOS), and Zahn-Wellens test, and the best results associated with these indices were obtained 0.56, 2.37, and over 98%, respectively. Phytotoxicity of leachate was remarkably reduced and the final effluent can be considered as a non-phytotoxic wastewater.
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Authors (7)
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Mohammad Reza Khavari Kashani
- Department of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran
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Qilin Wang
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, 2007, Australia
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Masoumeh Khatebasreh
- Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
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Xuan Li
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW, 2007, Australia
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Farshid Ghanbari
- Research Center for Environmental Contaminants (RCEC), Abadan University of Medical Sciences, Abadan, Iran
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Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
JOURNAL OF ENVIRONMENTAL MANAGEMENT
no. 338,
ISSN: 0301-4797 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Khavari Kashani M. R., Wang Q., Khatebasreh M., Li X., Sheikh Asadi A. M., Boczkaj G., Ghanbari F.: Sequential treatment of landfill leachate by electrocoagulation/aeration, PMS/ZVI/UV and electro-Fenton: Performance, biodegradability and toxicity studies// JOURNAL OF ENVIRONMENTAL MANAGEMENT -Vol. 338, (2023), s.117781-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jenvman.2023.117781
- Sources of funding:
-
- -
- Verified by:
- Gdańsk University of Technology
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