钛基体PbO2电极对脱附浓缩液的电催化降解

摘要

Commercial PbO2 electrode was adopted as the anode for the electro-catalysis degradation of concentrated organic solution from an actual desorption process of centralized sewage treatment plant.The influences of different factors on the degradation and energy consumption were considered.The results indicate that the increase of current density could promote the COD removal and increase the BODs-to-COD ratio for the treated concentrated solution,hence increasing the bio-degradability.However,the increase of current density also leads to an obvious increase of unit energy consumption and a decrease of current efficiency.When the current density is 0.1 A/cm2,the BOD5-to-COD ratio of the treated concentrated solution is 0.63,which means it is feasible to use the biodegradation method to treat the remaining solution.The elongation of electrolysis time improves the COD removal efficiency and the unit energy consumption,but decreases the current efficiency and BOD5-to-COD ratio.So the electrolysis time in practice should be optimized.When the electrode area is fixed,the treatment efficiency decreases with the volume of treated solution.Thus,the electrode area and treated solution volume should be optimized according to practical situation.%为解决吸附法只能实现有机物富集浓缩但不能进行矿化降解的问题,采用商用钛基体PbO2电极组,对某化工园区污水处理厂的脱附浓缩液进行了电催化氧化处理,重点考察了电流密度、电解时间及处理体积等因素对电催化处理效果的影响.结果表明:电流密度增加有利于浓缩液化学需氧量(COD)的去除,使其可生化性提高,但是会造成单位处理能耗的增加和平均电流效率的降低;当电流密度为0.1 A/cm2时,浓缩液的5日生化需氧量(BOD5)与化学需氧量的比值达到0.63,可以考虑采用生物方法来处理剩余液体;电解时间延长可使COD去除率增加,但是会造成单位处理能耗的增加和平均电流效率的降低,且使得浓缩液的可生化性在处理后期下降,需要根据实际情况来选择合理的处理时间;当电极面积固定时,处理的浓缩液体积越大,则处理效果越差,需要根据实际情况对电极面积与处理废水体积的比值进行优化.