饮用水源突发镉污染的应急处理技术研究  

Emergency Treatment of Source Water after Cadmium Pollution Accident

作　　者：韩瑾[1] 李星[1] 杨艳玲[1] 巢猛 李圭白[3] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]东江水务有限公司,广东东莞523112 [3]哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090

出　　处：《中国给水排水》2012年第21期1-4,共4页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07423-002;2009ZX07423-003)

摘　　要：为应对可能出现的突发性镉污染事件,采用连续流试验考察了常规混凝沉淀工艺、KMnO4预氧化/混凝沉淀工艺、粉末炭(PAC)吸附/混凝沉淀工艺、KMnO4和PAC联用/混凝沉淀工艺以及高锰酸盐复合药剂(PPC)预氧化/混凝沉淀工艺对镉的去除效果。结果表明,常规混凝沉淀工艺的除镉效果有限,聚合氯化铝投量为4 mg/L时,对Cd2+的去除率仅为10.5%;KMnO4预氧化/混凝沉淀工艺、PAC吸附/混凝沉淀工艺、KMnO4和PAC联用/混凝沉淀工艺对Cd2+的去除率均有提高,但出水水质仍不能满足国家饮用水水质标准。PPC预氧化/混凝沉淀工艺的除镉效果明显,当PPC投量为3.5 mg/L时,沉后水中剩余Cd2+浓度降低至3.3μg/L,达到了国家饮用水水质标准,去除率为95.2%。因此,PPC预氧化可以作为东江沿岸水厂应对镉污染的一种有效的应急处理措施。To respond to accidental cadmium pollution incidents, the removal efficiency of cadmium by conventional coagulation-sedimentation, potassium permanganate pre-oxidation/coagulation-sedimentation, PAC pre-adsorption/coagulation-sedimentation, potassium permanganate pre-oxidation plus PAC pre-adsorption/coagulation-sedimentation and PPC pre-oxidation/coagulation-sedimentation was investigated in continuous flow tests. The results showed that the removal efficiency of cadmium by conventional coagulation-sedimentation was poor, and the removal rate of cadmium was 10.5% when polyaluminum chloride was 4 mg/L. Potassium permanganate pre-oxidation/coagulation-sedimentation, PAC preadsorption/coagulation-sedimentation and potassium permanganate pre-oxidation plus PAC pre-adsorption/coagulation-sedimentation could improve the removal rate of cadmium, but the effluent quality could not meet the national drinking water quality standard. PPC pre-oxidation/coagulation-sedimentatiou could enhance the removal rate of cadmium effectively. When PPC was 3.5 mg/L, the residual cadmium con-centration in the sedimentation effluent was 3.3 μg/L, meeting the national drinking water quality stand- ard, and the removal rate of cadmium was 95.2%. PPC pre-oxidation/coagulation-sedimentation treat- ment process is an effective emergency response to cadmium pollution.

关 键 词：KMNO4 粉末活性炭 高锰酸盐复合药剂 镉污染 应急处理 

分 类 号：TU991.2[建筑科学—市政工程]