2017 Volume 11 Issue 9
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WANG Cheng, XU Cancan, LIU Rui, LI Guohua, CHEN Lüjun. AOX removal in excess activated sludge of a dye wastewater treatment plant with zero-valent iron reduction, Fenton oxidation and their combination[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5227-5232. doi: 10.12030/j.cjee.201609048
Citation: WANG Cheng, XU Cancan, LIU Rui, LI Guohua, CHEN Lüjun. AOX removal in excess activated sludge of a dye wastewater treatment plant with zero-valent iron reduction, Fenton oxidation and their combination[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5227-5232. doi: 10.12030/j.cjee.201609048
shu

AOX removal in excess activated sludge of a dye wastewater treatment plant with zero-valent iron reduction, Fenton oxidation and their combination

  • 1.

    School of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

  • 2.

    Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment in Yangtze Delta Region Institute of Tsinghua University, Zhejiang, Jiaxing 314006, China

  • 3.

    School of Environment, Tsinghua University, Beijing 100084, China

  • Received Date: 23/12/2016
    Accepted Date: 06/09/2016
    Available Online: 26/08/2017
    Fund Project:
  • Dye wastewater contains a variety of halogenated organic synthetic intermediates which are difficult for bio-degradation. These halogenated organic compounds are readily adsorbed onto activated sludge in a wastewater biological treatment process, and thereby pose risks to ecosystems and human health if discharged without proper treatment. In this study, excess activated sludge of a dye wastewater treatment plant was treated with zero-valent iron reduction, Fenton oxidation and zero-valent iron reduction followed with Fenton oxidation. The AOX (adsorbable organic halogens) removal rate was compared, the operation conditions were optimized and the removal mechanisms were investigated. The results showed that only 24.7% of AOX was removed when the sludge was reduced for 30 d with 5 g·L-1 of zero-valent iron powder under anaerobic environment. The removal rate of AOX was increased to 73.7% when 0.059 mol·L-1 of Fe2+ and 0.89 mol·L-1of H2O2 was dosed for 1.5 h of Fenton oxidation. The AOX removal rate was further increased to as high as 90.3% when the sludge was reduced in an anaerobic environment for 30 d with 2 g·L-1 of zero-valent iron powder and then oxidized with Fenton reagent. GC-MS analysis revealed that 2,6-dichloro-4-nitroaniline was of the principal AOX component, which was efficiently removed by the combined process of zero-valent iron reduction and Fenton oxidation.
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AOX removal in excess activated sludge of a dye wastewater treatment plant with zero-valent iron reduction, Fenton oxidation and their combination

  • Received Date: 23/12/2016
  • Accepted Date: 06/09/2016
  • Available Online: 26/08/2017
Fund Project:

Abstract: Dye wastewater contains a variety of halogenated organic synthetic intermediates which are difficult for bio-degradation. These halogenated organic compounds are readily adsorbed onto activated sludge in a wastewater biological treatment process, and thereby pose risks to ecosystems and human health if discharged without proper treatment. In this study, excess activated sludge of a dye wastewater treatment plant was treated with zero-valent iron reduction, Fenton oxidation and zero-valent iron reduction followed with Fenton oxidation. The AOX (adsorbable organic halogens) removal rate was compared, the operation conditions were optimized and the removal mechanisms were investigated. The results showed that only 24.7% of AOX was removed when the sludge was reduced for 30 d with 5 g·L-1 of zero-valent iron powder under anaerobic environment. The removal rate of AOX was increased to 73.7% when 0.059 mol·L-1 of Fe2+ and 0.89 mol·L-1of H2O2 was dosed for 1.5 h of Fenton oxidation. The AOX removal rate was further increased to as high as 90.3% when the sludge was reduced in an anaerobic environment for 30 d with 2 g·L-1 of zero-valent iron powder and then oxidized with Fenton reagent. GC-MS analysis revealed that 2,6-dichloro-4-nitroaniline was of the principal AOX component, which was efficiently removed by the combined process of zero-valent iron reduction and Fenton oxidation.

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