A^2O工艺不同阶段混合液的膜污染特性  

Membrane fouling characteristics of the mixed liquids from different stages of A^2O process

作　　者：余丽娟 武品 王志平[1] 陈亚 陈杰 YU Lijuan;WU Pin;WANG Zhiping;CHEN Ya;CHEN Jie(School of Environmental Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China;China-UK Low Carbon College,Shanghai Jiaotong University,Shanghai 200240,China;Shanghai Runyuan Water Technology Co.Ltd.,Shanghai 201100,China)

机构地区：[1]上海交通大学环境科学与工程学院,上海200240 [2]上海交通大学中英国际低碳学院,上海200240 [3]上海润源水务科技有限公司,上海201100

出　　处：《环境工程学报》2020年第6期1481-1487,共7页Chinese Journal of Environmental Engineering

基　　金：国家水体污染治理与控制科技重大专项(2017ZX07206004)。

摘　　要：为满足日益严苛的排水标准,将A^2O工艺叠加膜组件是提高出水水质的有效措施。采用恒压膜通量实验、三维荧光光谱、分子排阻色谱和红外光谱对A^2O工艺各阶段混合液的膜污染潜力及其对应的污染物组成进行了分析,从膜污染的角度考察了A^2O工艺与膜组件的最优结合形式。结果表明:好氧段混合液的恒压膜通量远高于厌氧和缺氧段的混合液,其溶解性有机物含量最少,且主要为不易发生膜污染的大分子惰性腐殖酸和微生物代谢产物;而厌氧和缺氧混合液中含有大量溶解性有机物,主要为氨基酸、蛋白质类物质,容易引发膜污染。因此,建议在实际工程中将膜组件应用于好氧阶段的泥水分离,不仅能有效提高出水水质,还能有效降低膜污染。以上结果可为膜组件用于A^2O工艺的提标改造提供参考。In order to meet the increasingly stringent drainage limits, A^2O process combined with membrane module is an effective measure to improve the quality of effluent. In this study, the constant pressure membrane flux test, three-dimensional fluorescence spectrum, size exclusion chromatography and infrared spectroscopy were used to analyze the membrane fouling potential and compositions of the mixed liquid from each stage of A^2O process, the optimal combination of A^2O process and membrane module was determined from the membrane fouling point of view. The results showed that the membrane flux of the aerobic mixed liquids was much higher than that of the anaerobic or anoxic mixed liquids, and the dissolved organics in the aerobic mixed liquids was the lowest, which was mainly consisted of the macromolecular inert humic acid and microbial metabolites with low membrane fouling potential. However, the mixed liquids from anaerobic and anoxic stage contained a large amount of dissolved organics, which mainly was amino acid and protein-like substances and easily to cause membrane fouling. Therefore, in practical, the membrane module was preferably applied for the solid-liquid separation in the aerobic stage, which could improve the quality of effluent and effectively reduce membrane fouling. This provides a useful theoretical reference for the application of membrane module in the upgrading of A^2O processes.

关 键 词：A2O工艺 溶解性有机物 膜污染 三维荧光 腐殖质 蛋白质 

分 类 号：X703[环境科学与工程—环境工程]