印染废水预处理对缓解PVDF超滤膜污染的研究  

Effect of Printing and DyeingWastewater by Pretreatment for Improved Anti-Fouling of PVDF Ultrafiltration Membranes

作　　者：程棋波 魏超 刘梅红 俞三传 CHENG Qibo;WEI Chao;LIU Meihong;YU Sanchuan(Hangzhou Haiyu Environmental Technology Co.,Ltd,311121;School of Science,Zhejiang Sci-Tech University,310018:Hangzhou,China)

机构地区：[1]浙江海禹环保科技有限公司,311121 [2]浙江理工大学理学院,浙江杭州310018

出　　处：《水处理技术》2022年第12期135-139,144,共6页Technology of Water Treatment

基　　金：浙江省重点研发计划项目(2021C03172)。

摘　　要：采用平均孔径为0.03μm的外压式聚偏氟乙烯(PVDF)中空纤维超滤膜,对印染废水进行深度处理,研究混凝/臭氧预处理减缓超滤膜污染的机制。采用预处理+恒通量加压过滤方式,系统研究了预处理对初始跨膜压差、膜污染阻力和水力反洗效率等的影响。结果表明:在75.0 L/(m2·h)恒定通量下超滤,印染废水原水的初始跨膜压差为40.0 kPa、60分钟内污染物沉积造成的膜污染阻力为3.2×10^(13) m^(-1)、水力反洗效率低于60.0%;经200 mg/L三氯化铁和2 mg/L聚丙烯酰胺(PAM)的混凝预处理后,初始跨膜压差为18.0 kPa、膜污染阻力为5.0×10^(12) m^(-1)、水力反洗效率高于90%;在pH=11下,经80 mg/L臭氧氧化预处理,初始跨膜压差为23.0 kPa、膜污染阻力为8.5×1012 m-1、水力反洗效率低于80.0%。混凝预处理对超滤膜污染的减轻程度优于臭氧预氧化。研究结果将为超滤深度处理印染废水的预处理工艺选择和膜污染控制提供一定的指导作用。In this study,an external pressure polyvinylidene fluoride(PVDF)hollow fiber ultrafiltration membrane with an average pore size of around 0.03μm was employed to investigate the fouling mitigation in the advanced treatment of printing and dyeing wastewater by pretreatment of coagulation or ozone oxidation.The effects of pretreatment on initial trans-membrane pressure,anti-fouling as well as hydraulic back-wash efficiency were systematically studied through cross-flow pressurized permeation tests under constant flux.It was found that,under the constant permeation flux of 75.0 L/(m2·h)and the initial trans-membrane pressure of 40.0 kPa,the membrane fouling from a 60-min filtration was contributed to the fouling resistance of 3.2×10^(13) m^(-1) and the hydraulic back-wash efficiency below 60%.After coagulation pretreatment with 200 mg/L FeCl_(3) and 2 mg/L polyacrylamide(PAM),the initial trans-membrane pressure difference was 18.0 kPa,the membrane fouling resistance was 5.0×10^(12) m^(-1),and the hydraulic back-wash efficiency was higher than 90%.After pretreatment with 80 mg/L ozone oxidation at pH=11,the initial trans-membrane pressure difference was 23.0 kPa,the membrane fouling resistance was 8.5×10^(12) m^(-1),and the hydraulic back-wash efficiency was lower than 80%.The antifouling by coagulation was greater than that by ozone oxidation.The obtained results will provide guidance for the selection of pretreatment process and fouling control of PVDF ultrafiltration membrane in the printing and dyeing wastewater treatment.

关 键 词：超滤 印染废水 膜污染 预处理 混凝 臭氧氧化 

分 类 号：TQ028.8[化学工程]