Pilot study on the advanced treatment of landfill leachate using a combined coagulation, fenton oxidation and biological aerated filter process.
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.
Wang
Xiaojun
X
School of Environmental Science and Engineering, South China University of Technology, People's Republic of China. cexjwang@scut.edu.cn
Chen
Sili
S
Gu
Xiaoyang
X
Wang
Kaiyan
K
D003116:Color; D005374:Filtration; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis; D010084:Oxidation-Reduction; D010865:Pilot Projects; D013997:Time Factors; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000517:prevention & control*
C045076:Fenton's reagent; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron