多元微电解技术对高浓度化学清洗废水预处理的影响

以高浓度化学清洗废水为研究对象,分别考察了常规混凝沉淀、多元微电解2种工艺对有机物污染物的去除效率和改善废水可生化性的效果。结果表明:多元微电解工艺的最佳pH 3.0,填充比1:3,微电解1 h,气水比1:1的条件下,其对COD平均去除率可达到60%,而直接混凝沉淀仅为10.5%,多元微电解工艺能使BOD5/COD值由原来的0.12升高到0.32,提高了废水的可生化性,减轻了后续生化处理负荷,是对高浓度化学清洗废水的有效预方法。

Effect of multiple microelectrolysis process on pretreatment of high concentration chemical cleaning wastewater

Coagulation sedimentation and multiple micro-electrolysis processes were used to pretreat high concentration chemical cleaning wastewater and the organics removal efficency and biodegradability were investigated respectively.The results show that the COD average removal rate reached 60% under the conditions of pH value of 3.0,filling rate of 1:3,micro-electrolysis reaction time of 1 h,gas-water ratio of 1:1,and the rate of direct coagulation sedimentation was merely 10.5%.The biodegradability was improved greatly with the BOD₅/COD ratio increased from 0.12 to 0.32,and the loading of subsequent biochemical treatment decreased.The multiple micro-electrolysis process is an effective pretreatment method for high concentration chemical cleaning wastewater.