【摘要】 如何控制微生物生长、保障水质生物稳定性,是再生水输配与利用过程中关注的重要问题。可同化有机碳(AOC)是评价水质生物稳定性的重要指标。对北京市某再生水厂超滤/臭氧氧化处理过程中AOC浓度及其分子质量分布特性的变化进行了研究,结果表明:二级出水中的AOC主要为分子质量>10 ku的有机物,超滤对二级出水中有机物的去除效果良好,对AOC的去除率达到73%。臭氧氧化可提高有机物的可生化性,导致AOC浓度升高了48%。在二级出水和超滤出水中,AOC物质以分子质量>10 ku的有机物为主,分别占79%和59%;经臭氧处理后,小分子质量(<1 ku)有机物对AOC的贡献明显上升,所占比例达到74%,同时大分子质量(>10 ku)和中等分子质量(1～10 ku)有机物所占的比例分别下降到22%和3%。更多还原

【Abstract】 Control of microbial growth and biostability is important to the transportation,distribution and use of reclaimed water.Assimilable organic carbon(AOC) is an important index to evaluate water biostability.The changes in AOC concentration and its molecular weight distribution in the ultrafiltration/ozonation treatment process were investigated in a reclaimed water plant in Beijing.The results showed that the AOC in the secondary effluent was mainly composed of macromolecular organic compounds(more than 10 ku).The removal rate of AOC in ultrafiltration was 73%.Ozonation could improve the biodegradability of organic matters in reclaimed water,resulting in a 48% increase in AOC.The proportions of AOCs with molecular weight more than 10 ku to total AOC were 79% and 59% in the secondary effluent and after ultrafiltration,respectively.The proportion of AOCs with molecular weight less than 1 ku increased to as high as 74% after ozonation.Meanwhile,the proportions of AOC with molecular weights of more than 10 ku and of 1 to 10 ku decreased to 22% and 3% respectively after ozonation.更多还原