氯氰菊酯废水物化和生化处理的研究

Study on Physicochemical and Biochemical Treatment of Cypermethrin Wastewater

对氯氰菊酯生产废水进行了物化预处理和生化处理试验。物化预处理工艺路线为高温高压氧化法（湿式氧化法），最佳温度为２２０℃，对应压力为３．５４ＭＰａ，最佳时间为１ｈ。废水经预处理后，ＣＯＤ 从４３１００ｍ ｇ／Ｌ 降至１７３００ｍ ｇ／Ｌ，去除率为６０％ ；氰含量从３６４０ｍ ｇ／Ｌ降至小于１ｍ ｇ／Ｌ，去除率高达９９．９％ ；出水ＢＯＤ５／ＣＯＤ 上升至０．３４。生化处理试验进水为预处理出水与稀释水的混合水，经生化处理，ＣＯＤ 从５６０～８７０ｍ ｇ／Ｌ 降至小于１５０ｍ ｇ／Ｌ，去除率为８０％ ～９２％ ；出水水质清，ｐＨ、ＣＯＤ、ＢＯＤ５、ＳＳ均能达到排放标准。

The tests for treatment of the wastewater from cypermethrin production were carried out.The wastewater was first pretreated by wet oxidation process under the optimum conditions of 220℃ of temperature,3.54 MPa of pressure and 1h of oxidation time.Through pretreatment COD reduced from 43100 mg/L to 17300 mg/L with 60% of removal rate,cyanide decreased from 3640 mg/L to less than 1 mg/L with 99.9% of removal rate and the ratio of BOD 5/COD increased to 0.34.The effluent from pretreatment process was diluted and then treated by biochemical process.Via biochemical treatment COD reduced from 560～870 mg/L to less than 150 mg/L with 80%～92% of removal rate.The final effluent was clear and pH,COD,BOD 5 and SS could meet the discharge standards.