聚硅酸钛强化混凝焦化废水预处理性能研究
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摘要
以硅酸钠和四氯化钛为主要原料,制备了新型聚硅酸钛絮凝剂PTSC,考察Si/Ti摩尔比、pH值和活化时间对PTSC絮凝剂强化混凝处理模拟废水性能的影响。结果表明,在Si/Ti摩尔比为0.5,pH值为9,活化时间在12～48 h时,所制备的PTSC絮凝剂对高岭土-腐殖酸模拟废水混凝性能较优。将其用于实际焦化废水混凝预处理后,对浊度、UV254、COD和DOC都具有较好的去除性能,去除率分别达到55%,11%,25%,30%。
A new type of PTSC(poly titanium-silicate-chloride) flocculant was prepared with sodium silicate and titanium tetrachloride as the main raw materials.The effects of the molar ratio of Si/Ti,pH and activation time on the PTSC flocculation behaviors of simulated wastewater were investigated.The results showed that the obtained PTSC,prepared under the condition of the Si/Ti molar 0.5,pH 9 and the activation time was within 12～48 h,had the best coagulation performance for kaolin-humic acid simulated wastewater.After being used in the actual coking wastewater coagulation pretreatment,it was found that the PTSC also exhibited high removal of turbidity,UV254,COD and DOC,which could reach 55%,11%,25% and 30%,respectively.
A new type of PTSC(poly titanium-silicate-chloride) flocculant was prepared with sodium silicate and titanium tetrachloride as the main raw materials.The effects of the molar ratio of Si/Ti,pH and activation time on the PTSC flocculation behaviors of simulated wastewater were investigated.The results showed that the obtained PTSC,prepared under the condition of the Si/Ti molar 0.5,pH 9 and the activation time was within 12～48 h,had the best coagulation performance for kaolin-humic acid simulated wastewater.After being used in the actual coking wastewater coagulation pretreatment,it was found that the PTSC also exhibited high removal of turbidity,UV254,COD and DOC,which could reach 55%,11%,25% and 30%,respectively.
引文
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[2]何慧琴,童仕唐.水处理中絮凝剂的研究进展[J].应用化工,2001,30(6):16-18.
[3]黄鑫.聚合钛盐混凝剂的研究[D].济南:山东大学,2017.
[4]Huang X,Gao B,Wang Y,et al.Coagulation performance and flocs properties of a new composite coagulant:Poly titanium-silicate-sulfate[J].Chemical Engineering Journal,2014,245(6):173-179.
[5]张万辉,韦朝海,吴超飞,等.焦化废水中有机物的识别、污染特性及其在废水处理过程中的降解[J].环境化学,2012,31(10):1480-1486.
[6]蒋绍阶,刘宗源.UV254作为水处理中有机物控制指标的意义[J].土木建筑与环境工程,2002,24(2):61-65.
[7]文彦杰.聚硅酸金属盐絮凝剂的制备及性能研究[D].北京:北京化工大学,2012.
[8]孙剑辉,徐毅.聚硅酸盐类絮凝剂的研究进展[J].工业水处理,2000,20(3):4-6.
[9]Wei Y X,Dong X Z,Ding A M,et al.Characterization and coagulation-flocculation behavior of an inorganic polymer coagulant-poly-ferric-zinc-sulfate[J].Journal of the Taiwan Institute of Chemical Engineers,2016,58:351-356.
[10]陈伟.铁钛混凝剂的制备及在除藻和控制藻源膜污染中的应用研究[D].重庆:重庆大学,2016.
[11]Zouboulis A I,Moussas P A.Polyferric silicate sulphate(PFSi S):Preparation,characterization and coagulation behaviour[J].Desalination,2008,224(1/2/3):307-316.
[12]王晓莉.复合聚硅酸盐制备及焦化废水处理研究[D].成都:四川大学,2006.
[13]李优平.钛盐混凝去除无机As(III)的实验研究[D].西安:西安建筑科技大学,2014.
[14]Huang X,Gao B,Sun Y,et al.Effects of solution p H and synthetic method on destabilization process of poly titanium-silicate-chloride[J].Journal of Hazardous Materials,2016,311:230-236.