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Wang Qi, Lü Yongkang, Zhang Rong, Bi Jicheng. Supercritical water oxidation of cotton textiles dyeing wastewater[J]. Chinese Journal of Environmental Engineering, 2012, 6(11): 3959-3964.
Citation: Wang Qi, Lü Yongkang, Zhang Rong, Bi Jicheng. Supercritical water oxidation of cotton textiles dyeing wastewater[J]. Chinese Journal of Environmental Engineering, 2012, 6(11): 3959-3964.
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Supercritical water oxidation of cotton textiles dyeing wastewater

  • 1.

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China

  • 2.

    School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030021,China

  • 3.

    State Key Laboratory for Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

  • Received Date: 14/10/2011
    Accepted Date: 16/09/2011
    Available Online: 09/11/2012
    Fund Project:
  • Cotton textiles dyeing wastewater was treated by supercritical water oxidation (SCWO) in a continuous flow tubular reactor using hydrogen peroxide (H2O2) as an oxidant. The degradation of total organic carbon(TOC)and the ammonia and nitrogen(NH3-N)were studied at the temperature range of 400~600℃,25 MPa,residence time bewteen 10~45 s and excess oxygen varying from 0%~400%. The results showed that temperature is the most important factor influencing TOC degradation. The TOC degradation efficiency varies with excess oxygen at different temperatures. At 450℃, 20 s and excess O2 300％, the degradation efficiency of TOC is 98.94％. The degradation of NH3-N is closely related to temperature and excess oxygen of the reaction. When excess oxygen of 300%, the NH3-N concentration decreases from 55.42 mg/L to 3.31 mg/L as the temperature increases from 400℃ to 600℃. When oxidizing agent is absent at 600℃, the degradation of NH3 is difficult. The effects of excess oxygen and residence time of the reaction on the NH3 degradation are not obvious at 450℃.
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Supercritical water oxidation of cotton textiles dyeing wastewater

  • Received Date: 14/10/2011
  • Accepted Date: 16/09/2011
  • Available Online: 09/11/2012
Fund Project:

Abstract: Cotton textiles dyeing wastewater was treated by supercritical water oxidation (SCWO) in a continuous flow tubular reactor using hydrogen peroxide (H2O2) as an oxidant. The degradation of total organic carbon(TOC)and the ammonia and nitrogen(NH3-N)were studied at the temperature range of 400~600℃,25 MPa,residence time bewteen 10~45 s and excess oxygen varying from 0%~400%. The results showed that temperature is the most important factor influencing TOC degradation. The TOC degradation efficiency varies with excess oxygen at different temperatures. At 450℃, 20 s and excess O2 300％, the degradation efficiency of TOC is 98.94％. The degradation of NH3-N is closely related to temperature and excess oxygen of the reaction. When excess oxygen of 300%, the NH3-N concentration decreases from 55.42 mg/L to 3.31 mg/L as the temperature increases from 400℃ to 600℃. When oxidizing agent is absent at 600℃, the degradation of NH3 is difficult. The effects of excess oxygen and residence time of the reaction on the NH3 degradation are not obvious at 450℃.

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