The effect of dosing HCPA on decontamination efficiency and membrane fouling control for UF-MBR treating high color and high ammonia nitrogen source water at low temperature
SUN Nan1, CHEN Yan-li1, ZHANG Ying2
1. College of Water Conservancy & Civil Engineering, Northeast Agricultural University, Harbin 150030, China;
2. College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
The coupling process of high concentration of purified attapulgite (HCPA) and ultra-filtration membrane bioreactor (UF-MBR) was used to treat high color and ammonia nitrogen from source water at low temperature. The effect of HCPA on the decontamination efficiency and membrane fouling control in UF-MBR was examined. Based on the analysis of particle size distribution of sludge mixture, Zeta potential, relative molecular weight distribution of organics, flourier infrared spectroscopy and three-dimensional fluorescence spectra, the changes in properties of sludge mixture after adding HCPA into UF-MBR were explored. The micrographs of membrane before and after cleaning, and the material composition of the eluted liquid were studied, furthermore, the effect of HCPA on reducing membrane fouling was defined. The results show that, the removal effect of chroma, CODMn, TOC, NH4+-N, turbidity and so on for HCPA-UF-MBR was better 1.02~3.9 times than that for UF-MBR. TMP in HCPA-UF-MBR was always greater than in UF-MBR. After HCPA dosing, the average particle size of sludge flocculation in UF-MBR was small and tended to be uniform, which would cause the membrane flux reduce. Membrane fouling was controlled by HCPA through adsorption, carrying more organisms to degrade organics and reducing the viscosity of sludge mixture, so the decontamination efficiency in UF-MBR was not reduced but increased. For HCPA-UF-MBR, the potential of sludge mixture was decreased by 11%~26%, it would help sludge settling. The removal efficiency of organics was improved, especially for a relative molecular weight ranging from 3kD to10kD which was hard to be entrapped by UF membrane. The type and content of organics in sludge mixture and corresponding cake layer on the membrane surface were significantly decreased. The removal efficiency of protein and soluble microorganism metabolites was significant. The main pollutants of the membrane surface were inorganic substances such as Ca, Fe, Mg, Mn, Si and organic matters. Under the same operating conditions, compared with the membrane in UF-MBR, the membrane in HCPA-UF-MBR was with lower pollutant, more easily to be cleaned by water for organics on the surface. The effect of alkali cleaning membrane from MBR was the best. The study provides technical support for attapulgite application in MBR.
孙楠, 谌燕丽, 张颖. 投加HCPA对UF-MBR处理低温高色高氨氮水源水效能与膜污染控制的影响[J]. 中国环境科学, 2017, 37(4): 1339-1348.
SUN Nan, CHEN Yan-li, ZHANG Ying. The effect of dosing HCPA on decontamination efficiency and membrane fouling control for UF-MBR treating high color and high ammonia nitrogen source water at low temperature. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(4): 1339-1348.
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