铁基生物絮凝剂去除废水中的氟和铅

来源期刊:中国有色金属学报2012年第8期

论文作者:苗雨 闵小波 柴立元 尹一男

文章页码:2366 - 2373

关键词:铁基生物絮凝剂;氟去除;铅去除;废水

Key words:iron-bioflocculant; fluroide removal; lead removal; wastewater

摘    要: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。

Abstract: 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.

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