葡萄糖碳源反硝化脱氮过程亚硝酸盐积累特征探究

Characteristics of Nitrite Accumulation in the Process of Glucose Carbon Source Denitrification and Denitrification

为了探究葡萄糖作为补充碳源对反硝化规律的影响,建立序批式反应器(SBR),考察了不同乙酸与葡萄糖混合比对氨氮氧化及亚硝酸盐积累的影响。结果表明乙酸与葡萄糖混合比及污泥负荷均能影响反硝化规律。当碳源充足时,碳源类型对硝化过程影响不显著,而对反硝化过程具有显著影响。当ρ(乙酸)/ρ(葡萄糖)为2/1时,反硝化速率快,且ρ(NO_(2)^(-)-N)的最大积累量为2.24 mg/L。在污泥负荷为1000 mg/L时,各反应器中硝态氮均能被反硝化,但ρ(乙酸)/ρ(葡萄糖)为1/2组别中反硝化速率最慢,ρ(NO_(2)^(-)-N)积累量最小。NO_(3)^(-)-N的存在对NO_(2)^(-)-N的还原具有一定抑制作用。

In order to investigate the effect of glucose as a supplemental carbon source on the denitrification law,a sequential batch reactor(SBR)was established to investigate the effects of different mixing ratios of acetate and glucose on ammonia nitrogen oxidation and nitrite accumulation.The results showed that both the mixing ratio of acetic acid and glucose and the sludge load could affect the denitrification law.When the carbon source was sufficient,the type of carbon source had no significant effect on the nitrification process,but had a significant effect on the denitrification process.Whenρ(acetate)/ρ(glucose)was 2/1,the denitrification rate was fast,and the maximum accumulation ofρ(NO_(2)^(-)-N)was 2.24 mg/L.When the sludge load was 1000 mg/L,nitrate nitrogen could be denitrified in each reactor,but the denitrification rate was the slowest in theρ(acetate)/ρ(glucose)1/2 group,And the maximum accumulation ofρ(NO_(2)^(-)-N)was 2.24 mg/L.The presence of NO_(3)^(-)-N had a certain inhibitory effect on the reduction of NO_(2)^(-)-N.