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Environmental Engineering Research 2020;25(1): 80-87. DOI: https://doi.org/10.4491/eer.2018.268
Combination of air stripping and biological processes for landfill leachate treatment
Yosr Smaoui1, Jalel Bouzid1, and Sami Sayadi2
1Laboratory of Environmental Engineering and Eco Technology, National School of Engineers of Sfax, University of Sfax, BPW, 3038, Sfax, Tunisia
2Environmental Bioprocesses Laboratory, LMI Cosys-Med, Centre of Biotechnology of Sfax, BP: «1177», 3018 Sfax, Tunisia
Corresponding Author: Yosr Smaoui ,Tel: +216-58-532-310, Fax: +216-74-665-190, Email: smaoui_yosr@yahoo.fr
Received: August 1, 2018;  Accepted: February 12, 2019.
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Landfill waste decomposition generates a dark effluent named, leachate which is characterized by high organic matter content. To minimize these polluting effects, it becomes necessary to develop an effective landfill leachate treatment process. The objective of this study was to evaluate the performance of an innovative approach based on air stripping, anaerobic digestion (AD) and aerobic activated sludge treatment. A reduction of 80% of ammonia and an increase of carbon to nitrogen ratio to 25 were obtained, which is a suitable ratio for AD. This latter AD was performed in fixed bed reactor with progressive loading rate that reached 2 and 3.2 g COD/L/d for the raw and diluted leachate (1:2), respectively. The anaerobic treatment led to significant removal of chemical oxygen demand (COD) and biogas production, especially for the diluted leachate. The COD removal was of 78% for the raw leachate and a biogas production of 4 L/d with 70% methane content. The use of the diluted leachate led to 81% of COD removal and 7 L/d biogas with 75% methane content. It allowed a removal of 77% COD and more than 97% of the organic compounds present in the initial leachate sample.
Keywords: Activated sludge | Air stripping | Anaerobic digestion | GC-MS | Landfill leachate | Methane production
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