Municipal solid waste-derived biochar for the removal of benzene from landfill leachate

Article


Jayawardhana, Yohan, Mayakaduwa, S. S., Kumarathilaka, Prasanna, Gamage, Sewwandi and Vithanage, Meththika. 2019. "Municipal solid waste-derived biochar for the removal of benzene from landfill leachate." Environmental Geochemistry and Health: official journal of the Society for Environmental Geochemistry and Health. 41 (4), pp. 1739-1753. https://doi.org/10.1007/s10653-017-9973-y
Article Title

Municipal solid waste-derived biochar for the removal of benzene from landfill leachate

ERA Journal ID36373
Article CategoryArticle
AuthorsJayawardhana, Yohan, Mayakaduwa, S. S., Kumarathilaka, Prasanna, Gamage, Sewwandi and Vithanage, Meththika
Journal TitleEnvironmental Geochemistry and Health: official journal of the Society for Environmental Geochemistry and Health
Journal Citation41 (4), pp. 1739-1753
Number of Pages15
Year2019
PublisherSpringer
Place of PublicationNetherlands
ISSN0269-4042
1573-2983
Digital Object Identifier (DOI)https://doi.org/10.1007/s10653-017-9973-y
Web Address (URL)https://link.springer.com/article/10.1007/s10653-017-9973-y
Abstract

The potential of biochar, produced from fibrous organic fractions of municipal solid waste (MSW), for remediation of benzene, one of the frequently found toxic volatile organic compounds in landfill leachate, was investigated in this study based on various environmental conditions such as varying pH, benzene concentration, temperature and time. At the same time, landfill leachate quality parameters were assessed at two different dump sites in Sri Lanka: Gohagoda and Kurunegala. MSW biochar (MSW-BC) was produced by slow temperature pyrolysis at 450 °C, and the physiochemical characteristics of the MSW-BC were characterized. All the leachate samples from the MSW dump sites exceeded the World Health Organization permissible level for benzene (5 µg/L) in water. Removal of benzene was increased with increasing pH, with the highest removal observed at ~pH 9. The maximum adsorption capacity of 576 µg/g was reported at room temperature (~25 °C). Both Freundlich and Langmuir models fitted best with the equilibrium isotherm data, suggesting the involvement of both physisorption and chemisorption mechanisms. Thermodynamic data indicated the feasibility of benzene adsorption and its high favorability at higher temperatures. The values of Δ G suggested physical interactions between sorbate and sorbent, whereas kinetic data implied a significant contribution of chemisorption. Results obtained from FTIR provided clear evidence of the involvement of functional groups in biochar for benzene adsorption. This study suggests that MSW biochar could be a possible remedy for benzene removal from landfill leachate and at the same time MSW can be a potential source to produce biochar which acts as a prospective material to remediate its pollutants while reducing the volume of waste.

KeywordsChemisorption; Landfill leachate; Open dumps; Physisorption; Thermodynamic
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FunderNational Research Council
Byline AffiliationsNational Institute of Fundamental Studies, Sri Lanka
South Eastern University of Sri Lanka, Sri Lanka
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