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

发布时间：2018-03-24 02:14

本文选题：凹凸棒土　切入点：超滤膜生物反应器　出处：《中国环境科学》2017年04期

【摘要】：采用高浓度纯化凹凸棒土-超滤膜生物反应器(HCPA-UF-MBR)耦合工艺处理低温高色高氨氮水源水,考察HCPA对UF-MBR系统除污效能与膜污染控制的影响.基于污泥混合液粒径分布、Zeta电位、有机物相对分子质量分布、傅里叶红外光谱与三维荧光光谱分析探究HCPA投加后UF-MBR中污泥混合液性能的变化,研究清洗前后膜的微观性貌、洗脱液的物质成分,明确HCPA在减缓膜污染方面发挥的作用.结果表明:HCPA-UF-MBR工艺对色度、COD_(Mn)、TOC、NH_4~+-N、浊度等的去除效果优于UF-MBR工艺的1.02~3.9倍,HCPA-UF-MBR中TMP始终大于UF-MBR.投加HCPA后,UF-MBR内污泥絮体平均粒径变小、趋于均匀,易使膜通量降低,HCPA通过吸附、生物载体降解有机物与降低污泥混合液粘度作用控制膜污染,使系统除污效能未降返增;污泥混合液的|Zeta|电位降低11%~26%,利于污泥沉降;系统对UF膜难以截留的3~10kD小分子有机物的去除效能增强,污泥混合液与相应膜表面滤饼层中有机物种类与含量明显减少,系统对蛋白质类、溶解性微生物代谢产物去除效果显著.膜表面主要污染物为无机物Ca、Fe、Mg、Mn、Si与有机物,同样运行条件下膜HCPA-UF-MBR的污染程度比膜UF-MBR轻,污染物少;污染膜HCPA-UF-MBR表面的有机物易被水清洗但效果甚微,碱清洗膜效果最佳;该研究为凹凸棒土在MBR中的应用提供技术支撑.
[Abstract]:The high concentration purification attapulgite ultrafiltration membrane bioreactor (HCPA-UF-MBR) was used to treat low temperature, high color and high ammonia nitrogen source water. The effects of HCPA on the decontamination efficiency and membrane fouling control of UF-MBR system were investigated. The relative molecular mass distribution of organic compounds, Fourier transform infrared spectroscopy (FTIR) and three dimensional fluorescence spectroscopy (FT-FRS) were used to investigate the changes of the properties of sludge mixture in UF-MBR after adding HCPA, and to study the microcosmic features of the membrane before and after cleaning, and the composition of the eluent. The effect of HCPA on reducing membrane fouling was clarified. The results showed that the removal effect of HCPA-UF-MBR process on chrominance of CODMA-UF-MBR was better than that of HCPA-UF-MBR in HCPA-UF-MBR. The average particle size of flocs in UF-MBR was smaller than that of UF-MBR, and the average particle size of flocs in UF-MBR was smaller than that of UF-MBR, and the average particle size of flocs in UF-MBR was more uniform than that in HCPA-UF-MBR. It is easy to reduce the membrane flux by adsorption, to control membrane fouling by biocarrier degradation of organic matter and to reduce the viscosity of sludge mixture, so that the efficiency of system decontamination is not reduced, and the Zeta potential of sludge mixture is decreased by 11% and 26%, which is beneficial to sludge settlement. The removal efficiency of 3~10kD small molecule organic matter which is difficult to be cut off by UF membrane was enhanced, the kinds and contents of organic matter in sludge mixture and the filter cake layer on the surface of the corresponding membrane were obviously reduced, and the protein was also removed by the system. The main pollutants on the surface of the membrane are inorganic CaOFE-MgMn-Mn-Si and organic matter. Under the same operating conditions, the pollution degree of membrane HCPA-UF-MBR is lighter than that of membrane UF-MBR, and the pollutant is less. The organic matter on the surface of contaminated HCPA-UF-MBR is easy to be washed by water but has little effect, and the effect of alkali cleaning is the best. This study provides technical support for the application of attapulgite in MBR.
【作者单位】：东北农业大学水利与土木工程学院;东北农业大学资源与环境学院;
【基金】：黑龙江省博士后科学基金资助项目(LBH-Z13025)
【分类号】：TU991.2;X703

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