PVDF浸没式超滤膜市政污水再生处理运行研究

Study on the Operation of PVDF Submerged Ultrafiltration Membrane in Municipal Wastewater Regeneration

采用热致相分离(TIPS)法聚偏氟乙烯(PVDF)浸没式超滤膜,通过中试和工程项目应用考察了其在市政污水再生处理中的应用情况,研究了不同反洗条件和清洗条件对膜性能的影响,通过扫描电镜(SEM)、能谱分析(EDX)等技术手段进行污染物分析。结果表明,增加曝气量和反洗流量可以有效延缓膜污染,在没有维护性清洗条件下,运行通量可稳定在43.7 L/(m^(2)·h),而增加2~3 d/次的维护性清洗(MW)后运行通量可提高到46.3 L/(m^(2)·h),均高于原系统(聚丙烯膜)的运行通量。产水水质稳定,浊度基本稳定在30~40 mNTU。可为浸没式超滤膜在市政污水深度处理的运行提供指导。

The polyvinylidene fluoride(PVDF)submerged ultrafiltration membrane was prepared via thermally induced phase separation(TIPS),the application situation in municipal sewage regeneration treatment was investigated through pilot test and engineering project application,and the effect of different backwashing conditions and cleaning conditions on membrane performance was studied.Contaminant analysis was carried out through technical means such as scanning electron microscopy(SEM)and energy spectrum analysis(EDX).The results showed that,increasing the aeration volume and backwash flow rate could effectively delay membrane fouling,and the operating flux could be stabilized at 43.7 L/(m^(2)·h)without maintenance washing(MW)conditions,while it could be increased to 46.3 L/(m^(2)·h)under the condition of 2~3 d interval MW,both were higher than the operating flux of the original system(polypropylene membrane).The product water quality was stable,and the turbidity was basically stable at 30~40 mNTU.It can provide guidance for the operation of submerged ultrafiltration membrane in the advanced treatment of municipal wastewater.