超滤膜-活性炭联用工艺处理长江原水中试研究

不投加任何药剂的长江原水,通过粗格栅过滤后,直接采用超滤(UF)和颗粒活性炭(GAC)联用工艺进行处理。试验中水温、过滤周期、原水水质等对UF运行均有影响。其中温度的影响最大,UF-GAC联用工艺适合处理水温较高的夏秋季长江原水,而在水温较低的冬季要保证设备稳定运行较困难。长周期比短周期过滤更容易造成不可逆膜污染类物质的积累,水的浊度对膜污染也有影响但表现为可恢复膜阻。UF出水相对稳定并对浊度、铁、锰等指标去除率达99%,氨氮等指标满足出水要求,但对CODMn、UV254等去除效果较差,有时会略高于饮用水出水标准,而经GAC吸附后可满足国家饮用水卫生标准(GB 5749-2006)的要求。UF-GAC联用工艺可在短时间内采用,当活性炭吸附饱和后,便会失去对有机物的去除作用,一旦GAC过滤后出水水质恶化,颗粒活性炭需要更换或再生。

THE PILOT STUDY OF THE YANGTZE RIVER RAW WATER TREATED BY UF - ACTIVATED CARBON COMBINED TREATMENT PROCESS

A pilot study combining ultra-filtration(UF) which was the core technology and granular activated carbon(GAC) techniques to treat raw water which was just through the thick grille without any chemicals was processed.Test temperature,filter cycle,raw water quality on the UF all affected the operation.The greatest factor would be water temperature.Therefore,UF + GAC was fitted for summer and fall but hard for winter.At the same time,the long filter cycle was more likely leading to causes material accumulation which express irreversible membrane pollution than short cycle.As to water quality,the UF treatment had an excellent removal of turbidity,Fe and Mn.And the removal rates were up to 99%.The contents of the NH3、hardness and chloride besides the indexes of CODMn,UV254 of the effluent were below the national standard.With the advanced treatment of GAC,the indexes can meet the standard of effluent(GB 5749-2006).Technology can be used in a short time,because if active carbon absorption was saturated,you will lose function of removal of organic matter.Once remove role after evil,qualitative change GAC water particle activated carbon need to change or regenerate.