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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Pilot study on the advanced treatment of landfill leachate using a combined coagulation, fenton oxidation and
Xiaojun Wang1, Sili Chen, Xiaoyang Gu
1School of Environmental Science and Engineering, South China University of Technology, People's Republic of China. cexjwang@scut.edu.cn
Abstract:
Mature landfill leachate is typically non-biodegradable. A combination process was developed that includes coagulation, Fenton oxidation, and biological aerated filtering to treat biologically-produced effluent. In this process, coagulation and Fenton oxidation were applied in order to reduce chemical oxygen demand (COD) organic load, and enhance biodegradability. Poly-ferric sulfate (PFS) at 600 mgl(-1) was found to be a suitable dosage for coagulation. For Fenton oxidation, an initial pH of 5, a total reaction time of 3h, and an H(2)O(2) dosage of 5.4mmoll(-1), with a (H(2)O(2))/n(Fe(2+)) ratio of 1.2 and two-step dosing were selected to achieve optimal oxidation. Under these optimal coagulation and Fenton oxidation conditions, the COD removal ratios were found to be 66.67% and 56%, respectively. Following pretreatment with coagulation and Fenton oxidation, the landfill leachate was further treated using a biological aerated filter (BAF). Our results show that COD was reduced to 75mgl(-1), and the color was less than 10 degrees.
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