摘要
研究了粒状滤床生化反应柱对NO_3^-去除特性。结果表明,当容积负荷范围为每日1.92～3.84kg(NO_3^--N)/m^3时,反硝化率为95.7％～100％,相应CH_3OH消耗量为每日4.9～9.8kg/m^3;COD_(Cr)去除负荷为每日7.3～14.6kg/m^3。进水NO_3^-浓度越低,达到完全反硝化所需的C/N值越高;投加的C/N值越高,实际消耗的C/N值越高;当投加的C/N值低时,其消耗的C/N值也低,越接近于理论值(CH_3OH:NO_3^--N=2.47),相应的出水残留有机物也低(COD_(Cr)<10mL);投加的C/N值低于一定值时,NO_3^-将不能全部转化成氮气,此时水中的NO_2^-浓度<1mg/L;反硝化过程导致pH提高,当NO_3^-浓度<40mg/L时,pH<8.5。
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.
出处
《上海环境科学》
CAS
CSCD
1997年第11期28-31,共4页
Shanghai Environmental Sciences
基金
上海市教委重点科研项目
关键词
反硝化
饮用水
地下水
生化处理
Denitrification Drinking water Ground water Biochemical treatment
