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《Shanghai Environmental Sciences》 1997-11
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Removal of Nitrate from Drinking Water

Jin Xuebiao Yu Jinlian Zhang Yin ( Shanghai Teachers University, Shanghai 200234  
The process of removing NO3- by using biological grit filter bed has been conducted. The results showed that when the volumetric loading was 1.92-3.84kg(NO3--N) m3 per day, with denitrification efficiency of 95.7%-100%, and corresponding CH3OH consumption was 4.9-9.8kg/m3 per day, the CODcr removal load was 7.3-14.6kg/m3 per day. The lower the input NO3- concentration was, the higher the C/N would fully finish denitrification, the higher the input C/N was, the greater the actual consumption of C/N would be. As the input of C/N was low, the consumption of C/N was little, nearly to the theoretical value (CH3OH:NO3-N=2.47), while the corresponding remained organic matter was low (CODcr 10mg/L). If C/N was lower than a certain ratio, NOs would not fully converse into N2, While NO2- was less than 1mg/L. The denitrification would increase pH value, but not higher than 8.5 as NO3--N concentration was less than 40mg/L.
【Fund】: 上海市教委重点科研项目
【CateGory Index】: TU991.2
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