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复合膜生物反应器脱除地下水中硝酸盐的性能研究
张立辉,曹国民
作者单位E-mail
张立辉 资源与环境工程学院 huihui6298@126.com 
曹国民 资源与环境工程学院 gmcao@ecust.edu.cn 
摘要:
研究了一种可用于去除地下水中硝酸盐的复合膜生物反应器(简称CMBR),即利用膜状固定化细胞将反应器一隔为二,固定化细胞的一侧与受硝酸盐污染的地下水接触,另一侧与乙醇溶液(反硝化碳源)接触。同时在膜状固定化细胞与地下水接触一侧的表面覆盖了一张微孔滤膜,用于防止从膜状固定化细胞中脱落的微生物污染地下水。硝酸盐和乙醇分别从模拟地下水和乙醇水溶液中向膜状固定化细胞内扩散,其中的反硝化菌利用乙醇作为电子供体把硝酸盐还原为氮气,这样可以有效地防止过多的乙醇进入地下水一侧,污染地下水。结果表明,CMBR进行地下水反硝化脱氮的适宜条件是膜状固定化细胞厚度=4mm,细菌包埋量=20 g(湿重)/L(PVA溶液),C/N=6:1,温度=30℃,pH=7.0~8.0;处理过的地下水中硝酸盐氮、亚硝酸盐氮和化学耗氧量等水质指标均符合《生活饮用水卫生标准》(GB5749-2006)的要求。
关键词:  地下水  硝酸盐  反硝化  复合膜生物反应器  固定化细胞
DOI:
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Characteristics of Groundwater Denitrification Using a Composite Membrane Bioreactor
zhang lihui,cao guomin
Abstract:
A composite membrane bioreactor (CMBR) was investigated for groundwater denitrification. The CMBR had two well mixed compartments with one filled with the nitrate containing influent and the other with a dilute ethanol solution; The compartments were separated by the composite membrane consisting of a microporous membrane facing the influent for retention of the disaggregated bacteria and an immobilized cells facing the ethanol solution. Nitrate and ethanol molecules diffused from the respective compartments into the immobilized cells where nitrate was reduced to nitrite and next to gaseous nitrogen (N2) by the denitrifying bacteria present there with ethanol as carbon source. The immobilized cells can prevent excessive carbon source into groundwater. Results showed that the optimum conditions of groundwater denitrification were 4mm thickness of membranous immobilized cells, 20 g denitrifying bacteria (wet weight) per 1L PVA solution, 6:1 of C/N ratio, 30℃ and pH 7~8. The water quality indexes of nitrate nitrogen, nitrite nitrogen and chemical oxygen demand (CODMn) in treatment groundwater meet the requirements of current national standards for drinking water (GB5749-2006).
Key words:  groundwater, nitrate, denitrification, composite membrane bioreactor, immobilized cells

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