铁基生物絮凝剂去除废水中的氟和铅

采用自制的铁基生物絮凝剂对废水中氟、铅进行脱除。考察铁基生物絮凝剂投加量、pH、反应时间对F、Pb2+去除效果的影响。结果表明:随铁基生物絮凝剂投加量的增加,F、Pb2+去除率上升;酸性条件有利于F去除率的提高,碱性条件有利于Pb2+去除率的提高;随反应时间的延长,F、Pb2+去除率先上升后下降。在铁基生物絮凝剂投加量为7.5%(体积分数),pH值为6,反应时间为20 min的条件下,F、Pb2+去除率分别为69.75%和99.89%,水中残余F、Pb2+浓度分别为6.05 mg/L和0.226 mg/L,均低于国家《铅、锌工业污染物排放标准》(GB25466—2010)规定的限值。

Removal of fluoride and lead in wastewater with iron-bioflocculant

Fluoride and lead in the wastewater were removed with self-prepared iron-bioflocculant.The effects of the iron-bioflocculant dosage,pH,reaction time on the removal rate of fluoride and lead were also studied.The results show that the removal rates of F-and Pb2+ increase with the increase of dosage of iron-bioflocculant.F-can be removed more effectively under acidic condition,while alkaline iron solution is good for removing Pb2+.When the reaction time increases,the removal efficiency of F-and Pb2+ rise at the beginning then declines.In addition,the optimum treatment efficiency of the F-and Pb2+ is obtained when dosage is 7.5%(volume fraction),pH value is 6 and reaction time is 20 min.Under these conditions,the removal rates of F-and Pb2+ are 69.75% and 99.89%,respectively,and the residual concentrations of F-and Pb2+ are 6.05 mg/L and 0.226 mg/L,respectively,which are both lower than the emission standards of pollutants for lead and zinc industry at the same time.