摘要
重点研究了各工艺条件下的膜污染状况和混合液特性变化对膜阻力分布的影响。结果表明投加PAC和原水可生化性较好时都利于减缓膜污染。它们分别通过增加膜表面泥饼层的孔隙率和增大混合液的粒径分布来提高混合液可过滤性,使沉积层阻力Rc分别降至原MBR工艺的51.4%和33.3%。试验证实与原MBR工艺相比,投加PAC和采用可生化性较好的原水后,单位膜面积处理单位体积湖水时膜比通量的下降率分别由4.64%m-1下降至1.85%m-1和4.31%m-1。
In this paper membrane bioreaetor （MBR） was used to treat micro-polluted lake water for drinking water production.Two bench-scale tests were conducted, which adopted MBR-PAC hybrid process or used synthetic raw water with better biodegradability as raw water. Different membrane fouling conditions of these processes were compared, and the influences of mixed liquor characteristics on membrane resistances were emphatically discussed. It was found that PAC addition and improvement of raw water biodegradability both helped to relieve membrane fouling. They helped to improve the filterability of the mixed liquor through increasing the porosity of cake layer on the membrane surface or the floc size distribution ,and correspondingly decrease the cake resistance Rc to 51.4% and 33.3% of the original MBR process respectively. PAC addition and biodegradability improvement of raw water both decreased the accumulation of organic pollutants in the mixed liquor.
出处
《水处理技术》
CAS
CSCD
北大核心
2006年第2期30-33,共4页
Technology of Water Treatment
基金
江苏省高校自然科学基金项目(04KJD610109)
关键词
微污染地表水
MBR
PAC
混合液特性
膜阻力分布
膜污染
micro-polluted surface water
MBR
PAC
mixed liquor characteristics
membrane resistances
membrane fouling
