The formaldehyde-containing chemical wastewater from some chemical group has the characteristics of complex compounds, varying water quantity, and difficulty for treatment. The micro electrolysis-OCAR-composite contact oxidation was employed for separated treatment. When the CODCr and formaldehyde concentrations in wastewater were 5 276. 7 mg/L and 82. 52 rng/L respectively, the average removal rate of micro electrolysis-OCAR were 78. 6％ and 76. 5％ respectively, and the CODCr and formaldehyde concentrations in composite contact oxidation tank effluent were 106. 9 mg/L and 3. 72 mg/L respectively after pre-treatment. Alter analysis, it was proposed to modify the existing sand filtration tank into chemical oxidation tank to satisfy the formaldehyde concentration in effluent and the optimized H2O2 (ωB=30％)dosage was 1 mL/L. The engineering operation cost was 3. 9 YUAN/m3.%某化工集团排出的含甲醛废水具有来源复杂,水质水量差别大,处理难度高等特点,采用微电解-0CAR-两级接触氧化组合工艺进行分质处理.在高浓度废水CODCr和甲醛浓度分别为5 276.7 mg/L和82.52 mg/L时,微电解-OCAR系统的平均去除率为78.6%和76.5%,预处理后各类废水经两级接触氧化池处理后CODCr和甲醛浓度分别为106.9 mg/L和3.72 mg/L.经分析,为确保出水甲醛稳定达标,可将设计中原有的砂滤池改造为化学氧化池,H2O2(质量分数为30%)最佳投加量为1 mL/L.工程处理直接运行费用为3.9元/m3.
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