预氧化-化学沉淀法去除水中砷的试验研究  

Experiment of arsenic removal from water by preoxidation combined with chemical sedimentation process

作　　者：余素华 胡小芳 袁润权 

机构地区：[1]东江水务有限公司,广东东莞523000

出　　处：《供水技术》2012年第3期14-16,共3页Water Technology

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

摘　　要：研究了预氧化-化学沉淀法对水中砷的去除效果及其影响因素。结果表明,原水砷质量浓度为5倍标准限值时,在NaClO预氧化条件下,投加8 mg/L的聚合氯化铝可使砷去除率达到84%,且出水砷含量可以满足《生活饮用水卫生标准》(GB 5749—2006)限值要求;在KMnO4预氧化条件下,投加8 mg/L的聚合氯化铝可使砷去除率达到90%,且出水砷含量满足标准限值要求,而投加8 mg/L的聚合硫酸铁可使出水砷含量降至18.72μg/L,无法满足标准限值要求;采用聚合氯化铝作为混凝剂时的除砷效果优于聚合硫酸铁,以KMnO4作为预氧化剂时的除砷效果优于NaClO。The removal efficiency and influencing factors of arsenic in the water by preoxidation combined with chemical sedimentation process were investigated. The results showed that the arsenic removal rate could reach 84% by dosing 8 mg/L of polyaluminum chloride （PAC） combined with NaClO preoxidation, which the outflow arsenic could satisfy the requirement of Standards for Drinking Water Quality（ GB 5749 -2006） when the concentration of arsenic in raw water was 5 times of the limited value of the standards. The arsenic removal rate could reach 90% by dosing 8 mg/L of PAC combined with KMnO4 preoxidation, which the outflow arsenic could satisfy the requirement of the limited value of the standards. The outflow arsenic could be reduced to 18.72 μg/L by dosing 8 mg/L of polyferric sulfate, but it could not satisfy the requirement of limited value of the standards. The arsenic removal efficiency by adopting PAC as coagulant was superior to polyferric sulfate, and the arsenic removal efficiency by adopting KMnO4 as preoxidant was superior to NaClO.

关 键 词：砷 预氧化 混凝 沉淀 

分 类 号：TU991.2[建筑科学—市政工程]