(1. 中南大學 冶金科學與工程學院，長沙 410083；
2. 中南大學 國家重金屬污染防治工程技術中心，長沙 410083)
摘 要: 采用自制的鐵基生物絮凝劑對廢水中氟、鉛進行脫除。考察鐵基生物絮凝劑投加量、pH、反應時間對F−、Pb2+去除效果的影響。結果表明：隨鐵基生物絮凝劑投加量的增加，F(xiàn)−、Pb2+去除率上升；酸性條件有利于F−去除率的提高，堿性條件有利于Pb2+去除率的提高；隨反應時間的延長，F(xiàn)−、Pb2+去除率先上升后下降。在鐵基生物絮凝劑投加量為7.5%(體積分數(shù))，pH值為6，反應時間為20 min的條件下，F(xiàn)−、Pb2+去除率分別為69.75%和99.89%，水中殘余F−、Pb2+濃度分別為6.05 mg/L和0.226 mg/L，均低于國家《鉛、鋅工業(yè)污染物排放標準》(GB25466-2010)規(guī)定的限值。
關鍵字: 鐵基生物絮凝劑；氟去除；鉛去除；廢水
（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
