PAC和PAM混凝深度处理焦化废水的研究.doc

PAC和PAM混凝深度处理焦化废水的研究 袁茂彪 马雄风 王书萍 颜家保 (武汉科技大学化学工程与技术学院，武汉430081) 摘 要：以无机高分子絮凝剂PAC和有机絮凝剂PAM组成的混凝剂对焦化废水深度处理。分析了废水初始pH值，絮凝剂PAC投加量，絮凝剂PAM投加量，沉降时间对COD、色度和浊度的影响。研究表明：絮凝的最佳工艺条件为：废水初始pH值8，聚合氯化铝投加0 mg/L，聚丙烯酰胺投加量3 mg/L，沉降时间min。在此条件下，二沉池废水COD、色度、浊度去除率分别为%，%，%。COD为mg/L，色度为，。废水COD、色度和浊度明显的降低。、色度和浊度Study on advanced treatment of coking wastewater by PAC and PAM Yuan Maobiao Ma Xiongfeng Wang Shuping Yan Jiabao (Department of Chemical Engineering and Technology, Wuhan University of Science and Technology Wuhan 430081, China；) Abstract Coking wastewater is treated further by coagulant of PAC with a inorganic polymer flocculants and PAM with a organic polymer flocculants. The effects of the factors such as the initial pH value of effluent, the dosing quantity of flocculants PAC, the dosing quantity of flocculants PAM, the time of sedimentation on COD，turbidity and colourity are analyzed．The study shows that the best process conditions of flocculation are that the initial pH value is 8，the dosing quantity of flocculants PAC is 200 mg/L, the dosing quantity of flocculants PAM is 3 mg/L, the time of sedimentation is 25 minutes. The removal rate of COD, turbidity and colourity in discharged water after treatment is 76.20%, 83.00%, 97.49%. COD, turbidity and colourity are clearly reduced by coagulation. COD, turbidity and colourity of the coking wastewater after treatment are meted National emission standards. Keywords: Coagulant; Coking waste water; PAC; PAM; Further treatment 0 前言 焦化废水是煤制焦炭、煤气净化和焦化产品回收等焦化工艺产生的废水。焦化废水的组成复杂、多变，这取决于原煤性质、碳化温度、焦化产品回收工序与方法等因素。焦化废水不仅含有大量的氨、氰、硫氰酸盐等无机污染物，还含有酚、萘、喹啉、吡啶、蒽等杂环及多环芳香族化合物[1-2]。目前，国内外的焦化废水处理方法为A-O、A-A-O和SBR等活性污泥法。经生化处理后的焦化废水，COD在300 mg／L～400 mg／L，色度为0～，浊度为80～100，很难达到国家排放标准（GB 8978-1996 污水综合排放标准）。近年来国内外学者研究工作，采用物理、化学手段，进一步去除废水中的COD、色度、等。本文以聚合氯化铝聚丙烯酰胺为絮凝剂混凝处理焦化废水，考察混凝时间、聚合氯化铝用量、聚丙烯酰胺用量混凝的pH值对焦化废水混凝处理的影响。以期为焦化废水深度处理研究提供技术参考。 1 实验试剂与仪器 试剂：聚合氯化铝、聚丙烯酰胺、重铬酸钾、硫酸亚铁铵、硫酸银、硫酸、氢氧化钠、邻菲罗啉。实验所用试剂均为分析纯。 仪器：AL204型电子天平；T6新世纪紫外可见分光光计；pHS-25型pH计；；