摘要
根据化学共沉淀原理对污水中重金属净化的可能性进行了研究。选用FeSO_4和AlCl_3为共沉淀剂,以Cu、Cd、Cr、Hg和Pb为污染重金属。当pH7.0～8.0,共沉淀剂用量浓度为10.0μg/mL,共沉淀时间为24h,共沉淀重金属浓度为:Cu<50μg/mL,Pb<10μg/mL,Cd<5.0μg/mL,Hg<O.5μg/mL,Cr(Ⅵ)<0.5μg/mL,都有较好的净化效果。Cr(Ⅵ)在溶液中主要以阴离子形式存在,当浓度大于1.00μg/mL时,大部分仍保留在溶液中。这些条件适用于净化氧化塘污水中的重金属。
The method of removing heavy metals in waste water by using coprecipitation was studied. FeSO4 and A1C13 were selected as coprecipitants. Cd, Cu, Hg, Cr and Pb were served as the polluted heavy metals in sewage. The suitable pH of solution was adjusted to 7.0-8.0 and the appropriate amount of coprecipitants was 10.0 μg\mL.after coprecipitants were dded to, it must be settled at least for 24 hours.when the concentration of heavy metals was.Cu<50 μg/mL. Pb<10μg/mL5 Cd<5.0 μg/mL, Hg<0.5 μg/mL,Cr<0.5 μg/mL, the removing efficiency was very good.Owing to the form of Cr (Ⅵ) presented as negative ion in the solution, when the concentration of Cr (Ⅵ) was more than 1.OOμg/mL, most of which still remained in solution. All these conditions of coprecipitation were quite suitable for the removing heavy metals from lagoon sewage.
出处
《西北农业大学学报》
CSCD
1991年第2期55-60,共6页
Journal of Northwest Sci-Tech University of Agriculture and Forestry（Natural Science Edition)
关键词
共沉淀
净化
污水
重金属
coprecipitation, purification, sewage, heavy metal
