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Technique for advanced electrochemical oxidation treatment of nanofiltration concentrate of landfill leachate

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Wuhan University Journal of Natural Sciences

Abstract

Landfill leachate treated with combined process of “pretreatment +biological treatment +advanced treatment (NF)” to produce nanofiltration concentrate, which bio-chemical ratio (B/C) is less than 0.1 and CODcr concentration is 2 000–2 500 mg/L, high salt content. Which cannot be discharged under existing environmental standards. According to analysis based on electrochemical advanced oxidation mechanism, a two-step electrochemical technique was recommended. In the first step, a pulse electrochemical technique was adopted. With Fe as consumption electrode and current density of 10 mA/cm2, the pollutants were removed by means of Fenton reaction, electroflotation and electrocoagulation. In the second step, a double function electrode was used to perform electrocatalytic oxidation by means of titanium metallic oxidates. In the condition that current density being 12.5 mA/cm2, the pollutants were further removed by oxidation and electrolytic deposition. Result shows that the removing rate of CODcr, NH3-N and Cl- were 70%–85%, 90% and 25%, respectively; average value of B/C ratio increased from 0.09 to 0.38 and conductivity reduced by 10%.

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Authors and Affiliations

  1. Sinosteel Wuhan Safety and Environmental Protection Research Institute Co.,LTD, 430081, Hubei, Wuhan, China

    Changgui Xiong, Zhiliang Zhang, Jian Li & Hongji Ye

  2. Wuhan Weimeng Environmental Protection Technology Co., LTD, 430071, Hubei, Wuhan, China

    Guang Li & Zhengwu Xia

Authors
  1. Changgui Xiong
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  2. Guang Li
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  3. Zhiliang Zhang
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  4. Zhengwu Xia
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  5. Jian Li
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  6. Hongji Ye
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Corresponding author

Correspondence to Guang Li.

Additional information

Biography: XIONG Changgui, male, Professor, Master, research direction: water and wastewater treatment on technical research, engineering consultation and design.

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Xiong, C., Li, G., Zhang, Z. et al. Technique for advanced electrochemical oxidation treatment of nanofiltration concentrate of landfill leachate. Wuhan Univ. J. Nat. Sci. 19, 355–360 (2014). https://doi.org/10.1007/s11859-014-1025-1

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  • DOI: https://doi.org/10.1007/s11859-014-1025-1

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