多级接触氧化法在汽车涂装废水处理中的应用

汽车涂装废水具有可生化性低,化学需氧量(COD)浓度较高的特点,采用多级接触氧化法对其进行小型实验研究.以某汽车厂经物化工艺预处理后的涂装废水为实验原水,其BOD5/COD(5日生化需氧量与化学需氧量比值)0.1,COD质量浓度为800~1 500 mg/L.结果表明:多级接触氧化系统可有效降解涂装废水COD,实验系统稳定运行后,在水力停留时间为8 h的条件下,系统对COD的总去除率可达80%以上;同时,系统表现出较强的抗冲击能力,处理后废水的COD质量浓度均低于500 mg/L,达到了涂装车间废水排放要求.另一方面,该系统可有效降低剩余污泥的产量,结构简单,运行稳定,可大幅降低涂装废水的处理成本.

Application of the Multi-stage Contact Oxidation Method in Automobile Painting Wastewater Treatment

A multi-stage contact oxidation system was used in a bench-scale experiment study to treat the automobile painting wastewater， which has poor biodegradability and contains high concentration of COD (chemical oxygen demand). The wastewater used for this experiment is the actual painting wastewater which has been pretreated by the physic-chemical treatment process in the paint shop of some automobile factory， and its BOD₅/COD is less than 0.1， COD mass concentration is 800~1500mg/L. The results shown that the multi-stage contact oxidation system can efficiently degrade the COD of the painting wastewater. After the experimental system keeping running stably， the total COD removal rate is more than 80% with the hydraulic retention time (HRT) of 8 hours. Meanwhile， this system has a strong impact resistance capacity. The COD mass concentration of final treated wastewater is less than 500mg/L， which can reach the factory discharge requirement for the paint shop. Besides， this system with simple structure can efficiently reduce the excess sludge production and can keep running stably， which can greatly reduce the treatment cost for the painting wastewater.