Integration of US/Fe(2+) and photo-Fenton in sequencing for degradation of landfill leachate

The landfill leachate treated by sonication in presence of Fe(2+) (US/Fe(2+)) and then by photo-Fenton achieved the highest total organic carbon (TOC) removal efficiency among the screened processes. The lower initial pH, dosage of Fe(2+) and initial concentration of leachate were helpful in raising...

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Bibliographic Details
Published in:Water science and technology 2016, Vol.73 (2), p.260-266
Main Authors: Zha, F G, Yao, D X, Hu, Y B, Gao, L M, Wang, X M
Format: Article
Language:English
Subjects:
Biological Oxygen Demand Analysis
Hydrogen Peroxide - chemistry
Iron - chemistry
Oxidation-Reduction
Photolysis
Water Pollutants, Chemical - chemistry
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Summary:The landfill leachate treated by sonication in presence of Fe(2+) (US/Fe(2+)) and then by photo-Fenton achieved the highest total organic carbon (TOC) removal efficiency among the screened processes. The lower initial pH, dosage of Fe(2+) and initial concentration of leachate were helpful in raising TOC removal efficiency of leachate by US/Fe(2+). The optimal conditions for the US-photo-Fenton process were as follows: initial pH at 3.0, [H2O2]/[TOC0] at 2, [H2O2]/[Fe(2+)] at 5 and initial concentration of landfill leachate at 600 mg/L. The removal efficiency of TOC, chemical oxygen demand (COD) and 5-day biochemical oxygen demand (BOD5) were 68.3, 79.6 and 58.2%, while the BOD5/COD rose from 0.20 to 0.43 at optimum condition. Based on gas chromatography-mass spectrometry (GC-MS) results, 36 of a total of 56 pollutants were completely degraded by US-photo-Fenton treatment.
ISSN:0273-1223
DOI:10.2166/wst.2015.487