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Effects of concentrated leachate injection modes on stabilization of landfilled waste

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Abstract

Injection of concentrated leachate to landfills is a simple and cost-effective technology for concentrated leachate treatment. In this study, the effects of injection mode of concentrated leachate and its hydraulic loading rate on the stabilization of landfilled waste were investigated. Compared with the injection of concentrated leachate, the joint injection of leachate and concentrated leachate (1:1, v/v) was more beneficial to the degradation of landfilled waste and mitigated the discharge amount of pollutants at the hydraulic loading rate of 5.9 L m−2 day−1. As the hydraulic loading rate of the joint injection of leachate and concentrated leachate was increased from 5.9 to 17.6 L m−2 day−1, the organic matter, biologically degradable matter, and total nitrogen of landfilled waste were degraded more rapidly, with the degradation constant of the first-order kinetics of 0.005, 0.004, and 0.003, respectively. Additionally, NO2 −-N and NO3 −-N in the concentrated leachate could be well removed in the landfill bioreactors. These results showed that a joint injection of concentrated leachate and raw leachate might be a good way to relieve the inhibitory effect of high concentrations of toxic pollutants in the concentrated leachate and accelerate the stabilization of landfilled waste.

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Authors and Affiliations

  1. Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China

    Ruo He, Xiao-Meng Wei, Min Chen, Yao Su & Bao-Hu Tian

Authors
  1. Ruo He
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  2. Xiao-Meng Wei
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  3. Min Chen
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  4. Yao Su
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  5. Bao-Hu Tian
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Correspondence to Ruo He.

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Responsible editor: Zhihong Xu

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He, R., Wei, XM., Chen, M. et al. Effects of concentrated leachate injection modes on stabilization of landfilled waste. Environ Sci Pollut Res 23, 3333–3341 (2016). https://doi.org/10.1007/s11356-015-5554-8

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