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《Journal of Safety and Environment》 2003-02
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RESEARCH ON DRINKING WATER DENITRIFICATION

LUO Qi fang, TAN You ming, WANG Lin, ZENG Xin (Institute of Environmental Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China)  
The present paper aims to introduce its research on a method of drinking water denitrification. As is known, nitrogen is an indispensable nutritious element for human body; however, it can also contribute to the formation of nitrate (NO 3 - N), which is harmful to human body and even causes some serious diseases to human beings. In order to remove the nitrate (NO 3 - N) from drinking water, this paper has done a series of experiments in hope to apply the upflow anaerobic sludge blanket (UASB)reactor and immobilized microorganism to heterotrophic denitrification. The authors have also applied their own made coated electrode of immobilized denitrifying bacteria and bio electrochemical unit to their autotrophic denitrification process. The experiment results show that the removing rate of NO 3 - N from the water sample treated by UASB can reach 97.7% at room temperature if methanol is used as carbon source and when the ratio of organic carbon to nitrate nitrogen(C/N) is equal to or larger than (≥)1.0, the hydraulic resident time (HRT) is 4 h. And the experiments also demonstrate that the removing rate of NO 3 - N from the water sample treated by immobilized heterotrophic denitrifying bacteria can get as high as to 98.6% at 30 ℃, if acetic acid is used as carbon source and the ratio between C/N is equal to or larger than (≥) 1.0 with the HRT being 6 h. However, on the condition that exogenous carbon source is not added to the sample water with HRT being 60 h, the removing rate of NO 3 - N from the treated eutrophic water collected from East Lake, Wuhan, by immobilized heterotrophic denitrifying bacteria can only reach 93.5% at 30 ℃. With the adaptable anaerobic environment being quickly set up for the autotrophic denitrification process in our bio electrochemical unit, the removing ration of NO 3 - N from the water sample treated by the bio eletcrochemical unit can amount to 96.3% at the room temperature with HRT being 72 h.
【Fund】: 国家自然科学基金项目 (编号 :39870 664)
【CateGory Index】: TU991
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