微污染地表水的组合微滤工艺处理

Study on microfiltration combined process for micro-polluted surface water treatment

目的考察用粉末活性炭-膜生物反应器(PAC-MBR)组合工艺处理微污染地表水的出水水质,并分析造成膜污染的主要物质的分子量范围.方法常规项目采用国家环保局颁布的标准检测方法.用空间排阻液相色谱法(SE-LC)测定分子量分布,将膜污染物的分子量分布与进水、混合液和出水的分子量分布进行对比,确定主要膜污染物质的分子量范围.结果经该组合工艺处理后,出水的浊度和耗氧量(CODMn)均可达到<生活饮用水水质卫生规范>(2001)的要求,且该工艺对氨氮也有良好的去除.结论大分子物质是造成膜污染的主要物质,且其从混合液中的去除主要通过膜分离来实现,粉末活性炭(PAC)和生物作用对去除分子量在500～10000 Dalton之间的物质较为有效.

Objective To study micro - polluted surface water treatment by the PAC- MBR combined process and to investigate the quality of treated water and main part of membrane foulants. Methods Conventional parameters were detected by the standard methods which were issued by the National Environmental Protection Bureau. The molecular weight distribution（MWD） was measured by steric exclusion liquid chromatography （SE- LC）. The MWD of membrane foulants was compared with that of raw water, mixed liquor and treated water to determine the range of molecular weight of the major membrane foulants. Results Turbidity and CODMn of the treated water reached the requirement of Sanitary Standard for Drinking Water Quality（2001）, furthermore ammonia nitrogen was removed effectively. Conclusion The matter with macro molecule is the main part of membrane foulants and the removal of them from mixed liquor is mainly due to membrane separation, while PAC absorption and biological degradation show the advantage on removal of the matter which molecular weight between 500 and 10 000 Dalton.