(1. 中南大学 冶金科学与工程学院，长沙 410083；
2. 中南大学 国家重金属污染防治工程技术中心，长沙 410083)
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。
关键字: 铁基生物絮凝剂；氟去除；铅去除；废水
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Chinese National Engineering Research Center to Control and Treatment of Heavy Metal Pollution,
Central South University, Changsha 410083, China）
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.
Key words: iron-bioflocculant; fluroide removal; lead removal; wastewater
