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采用内压式超滤膜工艺中试系统,结合东营南郊水厂的预氧化/粉末活性炭/混凝/沉淀/砂滤/超滤工艺,对比研究了外压式PVC和内压式聚砜超滤膜的净化效能,以及膜通量对膜污染的影响差异。内压式聚砜膜和外压式PVC膜的出水浊度均稳定在0.02 NTU以下,粒径>2μm的颗粒数平均为10个/mL左右;混凝沉淀、砂滤、超滤单元对CODMn和TOC均有较显著的去除效果,具有多级屏障作用,但砂滤和超滤单元对UV254没有去除作用;对以上各指标的去除效果与膜材质和超滤形式均没有显著的相关性。对于引黄水库水的微污染水质特点,经过预氧化/粉末活性炭/混凝/沉淀工艺处理后,直接进行超滤更有助于缓解膜污染,延缓跨膜压差的增长。
The internal pressure type ultrafiltration membrane technology experimental system was used in this paper. Based on the pre-oxidation / powder activated carbon / coagulation / sedimentation / sand filtration / ultrafiltration process in the waterworks of the southern suburb of Dongying, The purification efficiency of the membrane, as well as membrane flux on the impact of membrane pollution differences. The turbidity of effluent of internal pressure type polysulfone membrane and external pressure type PVC membrane were all stable below 0.02 NTU, the average number of particles with particle size> 2μm was about 10 / mL. The coagulation sedimentation, sand filtration and ultrafiltration And TOC, respectively. However, sand and ultrafiltration units had no effect on UV254 removal. There was no significant correlation between the above indexes and membrane material and ultrafiltration. For the slightly polluted water quality of the Yellow River diversion reservoirs, the direct ultrafiltration after pre-oxidation / powder activated carbon / coagulation / sedimentation treatment can help alleviate membrane pollution and delay the growth of transmembrane pressure drop.