三维电极电化学氧化法深度处理DOP生产废水的研究
Study on advanced treatment of DOP wastewater by three-dimensional electrode electrochemical oxidation
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摘要: 采用以铁板作阴、阳极，活性炭作填充粒子的三维电极电化学氧化法深度处理DOP生产废水。探讨了废水的pH、槽电压、极板间距、活性炭投加量和反应时间等因素对COD去除率的影响，并通过正交实验确定了处理DOP废水的最佳工艺条件，还对COD的降解动力学规律进行了初步探讨。结果表明，三维电极电化学氧化法处理DOP生产废水的最佳工艺条件为：pH值为5、电极间距为4 cm、槽电压为25 V、活性炭投加量为12 g/L、电解时间为90 min。在此条件下，COD去除率可达71.5%，出水COD浓度为50.9 mg/L，达到国家污水综合排放标准（GB8978-1996）的一级标准。三维电极电化学氧化法对COD的降解反应呈表观一级反应，降解速率方程为C=C0e-0.0124t。Abstract: DOP wastewater was treated by three-dimension-electrode electrochemical oxidation， which iron plate was used as cathode and anode， and activated carbon was used as packed particle. The effects of initial pH， voltage， inter-electrodes distance， dosage of activated carbon and reaction time on COD removal rate were investigated. Orthogonal experiment was used to determine the optimal operation conditions. The dynamic law of degradation of COD was studied， too. The results show that the optimal conditions of operation are as follows: initial pH of 5， inter-electrodes distance of 4 cm， voltage of 25 V， activated carbon dosage of 12 g/L and reaction time of 90 min. Under the optimal conditions， the removal rate of COD can reach 71.5%. COD in effluent DOP wastewater of 50.9 mg/L， which can meet the first-level effluent standard of GB8978-1996. The degradation reaction of COD conforms to apparent first-order reaction. The rate equation of degradation of COD is C=C0e-0.0124t.
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