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Treatment of Municipal Landfill Leachate with Organically Modified Bentonite

Published online by Cambridge University Press:  01 January 2024

Hui Ling ,
Anhuai Lu ,
Changqiu Wang ,
Yan Li ,
Peng Chen ,
Jiangong Zhou  and
Jian Wang
Hui Ling
Affiliation:
Orogenic Belts and Crustal Evolution Key Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Anhuai Lu*
Affiliation:
Orogenic Belts and Crustal Evolution Key Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Changqiu Wang
Affiliation:
Orogenic Belts and Crustal Evolution Key Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Yan Li
Affiliation:
Orogenic Belts and Crustal Evolution Key Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Peng Chen
Affiliation:
Beijing Environment Sanitation Engineering Group Co., Ltd., Beijing 100067, China
Jiangong Zhou
Affiliation:
Orogenic Belts and Crustal Evolution Key Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Jian Wang
Affiliation:
Orogenic Belts and Crustal Evolution Key Laboratory, School of Earth and Space Sciences, Peking University, Beijing 100871, China
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Landfill leachate is one of the most difficult effluents with which to deal from an environmental perspective because of its concentration and complex composition, including refractory and toxic components such as heavy metals or xenobiotic organic compounds. The objective of the present study was to use organically modified bentonite (OMB) to dispose of landfill leachate >10 y old. The OMB was synthesized using a new method, which removed four steps (filtering, washing, drying, and grinding) from the traditional process. After treatment using OMB, the chemical oxygen demand concentration (COD concentration, an index of the organic pollutants in the landfill leachate, was determined using the potassium dichromate method) of the landfill leachate sample decreased from 2400 to 245 mg/L in 5 h, i.e. the organic pollutants reduction efficiency was as high as 90%. Gas chromatography-mass spectrometry results indicated that most of the organic compounds were removed during the process. The modified and unmodified bentonite contained in the OMB deal with the hydrophobic and hydrophilic organic pollutants, respectively, resulting in significant degradation of the leachate. The study results have provided a new cost-effective method for treatment of landfill leachate.

Keywords

HydrophilicityHydrophobicityLandfill LeachateOrganic PollutantsOrganically Modified Bentonite (OMB)
Type
Article
Information
Clays and Clay Minerals , Volume 59 , Issue 5 , October 2011 , pp. 518 - 524
Copyright
Copyright © Clay Minerals Society 2011

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