Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 90, Issue 8, Pages 1527-1536Publisher
WILEY
DOI: 10.1002/jctb.4484
Keywords
combined treatment; landfill leachate; Fenton treatment; biological oxidation; recalcitrant COD; reagent consumption
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Funding
- European Union through the European Regional Development Fund project CHEMBIO [3.2.0802.11-0043]
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BACKGROUNDAmong anthropogenic wastewaters, landfill leachate is known to contain numerous persistent organic pollutants, heavy metals, noxious microorganisms, etc., which makes the establishment of an efficient treatment procedure for leachate a matter of great importance. In this work, municipal waste landfill leachate was subjected to various types of chemical (CHEM) and biological (BIO) treatment with the final aim of establishing an optimal treatment scheme combining of individual physico-chemical and biological processes. RESULTSThree different treatment strategies (CHEM-BIO, BIO-CHEM and BIO-CHEM-BIO) were compared based on biodegradability and removal efficiencies achieved. Due to high initial biodegradability of raw leachate, the most efficient combined process was aerobic biological pre-treatment followed by Fenton treatment and subsequently biological post-treatment. The efficiency of combined treatment processes was investigated at laboratory scale, with over 90% COD and BOD7 removal(.) Finally, in order to evaluate the economic efficiency of the processes, consumption of Fenton's reagent was compared for CHEM-BIO and BIO-CHEM setups, with the latter achieving three times lower reagent consumption, at the same time providing similar treatment efficiency. CONCLUSIONSA readily-applicable efficient and economically feasible technological solution is provided for the treatment of typical municipal landfill leachate. (c) 2014 Society of Chemical Industry
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