曝气微电解法预处理难降解含氰农药废水  

Pretreatment of high salinity pesticide wastewater containing cyanide by aerated zero-valent iron

作　　者：于璐璐[1] 林海[1] 陈月芳[1] 周立[1] 杨河[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《化工学报》2011年第4期1091-1096,共6页CIESC Journal

摘　　要：微电解法可减轻后续处理负荷,降低废水毒性,为后续处理创造良好的条件。研究了几个主要工艺条件对其预处理高盐含氰农药废水COD和CN-的影响。结果表明,其最佳条件pH=4、铁炭质量比Fe∶C=1∶1、曝气量Q=150 L.h-1、t=3 h时,COD去除率为61.6%,出水CN-浓度为3.52 mg.L-1。对微电解过程的动力学过程进行了分析,发现微电解对COD的去除过程可分为3个阶段:第一为铁离子的酸溶出和COD吹脱阶段,铁的溶解速度快,约3.03 g TFe.h-1,COD主要通过吹脱而去除;第二为微电解高速反应阶段,约87.1%以上COD的去除总量通过微电解反应被去除;最后是反应滞止阶段,COD的去除不明显。The aerated zero-valent iron was used to treat the high salinity pesticide wastewater containing cyanide,which reduced post-processing load and the toxicity of wastewater and created favorable conditions for subsequent treatment.The results indicated,under the conditions that pH was 4,Fe∶C（g/g）was 1∶1,aeration flux was 150 L·h-1,reaction time was 3h,the removal rate of COD was 61.6% and the concentration of effluent＇s CN-was 3.52 mg·L-1.Through the primary dynamics analysis,COD removal process was divided into three phases.First,the acidic dissolution phase of iron,the COD removal by aeration phase,the dissolution velocity of iron was 3.03 g TFe·h-1.Second,the high velocity phase,about 87.1% of COD that being removed in all process was transformed.Third,the stagnation phase of zero-valent iron,the COD removal was stopped.

关 键 词：微电解 曝气 农药废水 铁溶出 

分 类 号：X703[环境科学与工程—环境工程]