Volume 7 Issue 6
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Article Navigation >  Journal of Environmental Engineering Technology  > 2017  >  7(6): 733-738
WANG Songyue, HUANG Yan, YANG Shangyuan, HU Muzhou, LIU Lei. Study on electrochemical enhanced catalytic oxidation reaction for chlorpyrifos production wastewater treatment[J]. Journal of Environmental Engineering Technology, 2017, 7(6): 733-738. doi: 10.3969/j.issn.1674-991X.2017.06.101
Citation: WANG Songyue, HUANG Yan, YANG Shangyuan, HU Muzhou, LIU Lei. Study on electrochemical enhanced catalytic oxidation reaction for chlorpyrifos production wastewater treatment[J]. Journal of Environmental Engineering Technology, 2017, 7(6): 733-738. doi: 10.3969/j.issn.1674-991X.2017.06.101
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Study on electrochemical enhanced catalytic oxidation reaction for chlorpyrifos production wastewater treatment

doi: 10.3969/j.issn.1674-991X.2017.06.101

  • R&D Center of Zhejiang Zone-King Environmental Sci & Tech Co., Ltd., Hangzhou 310004, China

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  • Corresponding author: Yan HUANG E-mail: yanhuang_now@163.com
  • Received Date: 2017-06-16
  • Publish Date: 2017-11-20
    Abstract
  • Electrochemical enhanced catalytic oxidation method, which combined electrolytic reaction with Fenton reaction, was used for the treatment of chlorpyrifos production wastewater. The removal efficiency of chlorpyrifos production wastewater by this method was investigated and compared with that using electrolytic reaction. The biodegradability of the effluent from electrochemical enhanced catalytic oxidation reaction was also studied. The results showed that with the gradual increase of the dose of H2O2 solution, the CODCr only decreased from initial 7 920 mg/L to 5 880 mg/L in 420 min after electrochemical enhanced catalytic oxidation reaction, which indicated that chlorpyrifos production wastewater is indeed refractory. In the sole electrolytic oxidation treatment, the CODCr decreased sharply in the first 20 min, with a reduction of 1 892 mg/L, then the CODCr value kept stable. But it started to decrease gradually in the later 80 min of coupled reaction with Fenton oxidation, which showed that the organics in the wastewater were further degraded. Combining the requirement of biodegradability of electrochemical enhanced catalytic oxidation effluent and the wastewater treatment, which demands effluent CODCr of 500-600 mg/L, the effluent from electrochemical enhanced catalytic oxidation reaction was diluted by 3 times and 4 times respectively to perform aerobic biodegradation experiment. The reaction kinetics constant was 383.4 and 298.3 min -1 respectively, indicating that the biochemical reaction process was more controlled by the CODCr concentration rather than the chemical toxicity of the effluent. Experiment on the hydrolytic acidification-aerobic reaction process for the treatment of effluent from electrochemical enhanced catalytic oxidation reaction was conducted, and it turned out that the removal rate of CODCr remained at above 60% (CODCr 512-673 mg/L), while that of TP is approximately 45% (TP 20-30 mg/L), and the removal rate of ammonia nitrogen went up to 95% (NH3-N 2.8-5.3 mg/L) in 21-day period.

     

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