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Advanced treatment of printing and dyeing wastewater by combination of vacuum ultraviolet and high frequency ultrasound irradiationChinese Full Text

LI Wenjie;HONG Tian;HU Yongyou;CHEN Yuancai;CHENG Jianhua;School of Environment and Energy,South China University of Technology;The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education;

Abstract: The vacuum ultraviolet( VUV) and high-frequency ultrasound( US) were combined to treat tail water from printing and dyeing wastewater. In order to determine the best power of the VUV-US combined system,the effects of the power of VUV,US and VUV-US on the degradation of the printing and dyeing wastewater were compared in terms of TOC and UV254. The influences of reaction time,reaction temperature and initial pH value on the degradation performance of the VUV-US combined system were investigated through batch experiments,and the degradation kinetics of TOC and UV254were explained. The removal mechanism of residual refractory organics by the VUV-US combined system was revealed by analyzing the degradation products. The results showed that the optimum power was 16 W for VUV and 100 W for US,respectively,and there is synergistic effect between VUV and US. 27. 68% of TOC and 93. 03% of UV254can be removed within 120 minutes by the VUV-US combined system. The reaction temperature and initial pH value had insignificant effects on the performance of the VUV-US combined system. The degradation kinetics of TOC and UV254by the VUV-US combined system showed a good compliance with the apparent second-order kinetic model and the apparent first-order kinetic model,respectively. VUVUS combined treatment is a synergistic process including VUV direct photolysis,thermal cracking in the ultrasonic cavitation bubbles and hydroxyl radicals oxidation. Hydroxyl radicals oxidation was mainly responsible for the degradation of refractory benzene compounds in the printing and dyeing wastewater.
  • DOI:

    10.13671/j.hjkxxb.2014.0694

  • Series:

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  • Classification Code:

    X791

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