Characterization of a joint recirculation of concentrated leachate and leachate to landfills with a microaerobic bioreactor for leachate treatment.
With comparison of a traditional landfill, a joint recirculation of concentrated leachate and leachate to landfills with or without a microaerobic reactor for leachate treatment was investigated in this study. The results showed that the joint recirculation of concentrated leachate and leachate with a microaerobic reactor for leachate treatment could not only utilize the microaerobic reactor to buffer the fluctuation of quality and quantity of leachate during landfill stabilization, but also reduce the inhibitory effect of acidic pH and high concentrations of ammonium in recycled liquid on microorganisms and accelerate the degradation of landfilled waste. After 390 days of operation, the discharge of COD and total nitrogen (TN) from the landfill with leachate pretreatment by a microaerobic reactor was 7.4 and 0.9 g, respectively, which accounted for 0.7% and 2.6% of COD, 1.9% and 7.5% of the TN discharge from the landfills without recirculation and directly recirculated with leachate and concentrated leachate, respectively. The degradation of the organic matter and biodegradable matter (BDM) in the landfill reactors could fit well with the first-order kinetics. The highest degradation of the organic matter and BDM was observed in the joint recirculation system with a microaerobic reactor for leachate treatment with the degradation constant of the first-order kinetics of 0.001 and 0.002.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: heruo@zju.edu.cn.
Ruo
R
He
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Xiao-Meng
XM
Wei
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Bao-Hu
BH
Tian
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Yao
Y
Su
Hangzhou Foreign Language School, Hangzhou 310023, China.
Yu-Lan
YL
Lu
D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002681:China; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D017672:Nitrogen Compounds / Q000032:analysis; D064091:Waste Disposal Facilities; D018505:Waste Management / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D005232:Fatty Acids, Volatile; D017672:Nitrogen Compounds; D014874:Water Pollutants, Chemical
Concentrated leachate; Joint recirculation; Landfill stabilization; Microaerobic reactor