碱度及Do对亚硝化反应的影响

目的】研究碱度和DO浓度对亚硝酸盐积累及半硝化的影响。方法】采用自制的立方形SBR反应器，反应器温度控制在28～33℃，进水氨氮浓度控制在80～110mg／L，研究碱度和DO2个因素对亚硝酸盐积累的影响。结果]水体中适当的碱度有益于亚硝酸盐的形成。低DO有利于亚硝酸盐的积累，但不利于氨氮的转化。当DO〈0．5mg／L时，氨氮去除率不高，仅50％左右，适合于半硝化反应，但亚硝酸盐积累率很高，最高可达99％；当DO〉1．5mg／L时，亚硝酸盐的积累率逐渐降低；DO在0．5～1．5mg／L时，氨氮的去除率和亚硝酸盐积累率都很高，适合于进行亚硝化反应。结论]在温度为28～33℃和进水氨氮浓度一定的情况下，控制碱度和DO能使亚硝酸盐在反应器内得到很好的积累。

Effects of Alkalinity and DO on Nitrosation Reaction

Objective ] The purpose was to study the effect of alkalinity and DO on the nitrite accumulation and semi-nitration. Method] The effects of alkalinity and DO on the nitrite accumulation were studied by the homemade cubical SBR reactor with its temperature being controlled by 28 -33℃ and the inlet ammonia nitrogen conch, being controlled by 80 -110 mg/L. Result] In the water body, the suitable alkalinity was beneficial to the formation the nitrite. Low DO was advantageous to the nitrite accumulation, but did not fit for the transformation of ammonia nitrogen. When DO was lower than 0.5 mg/L, the removal rate of ammonia nitrogen was not high, only about 50%, which favored for the semi-nitration reaction, but the accumulation rate of nitrite accumulation was very high, with the highest as 99%. When DO was higher than 1.5 mg/L, the accumulation rate of nitrite was gradually decreased. When DO was in 0.5 - 1.5 mg/L, the removal rate of ammonia nitrogen and the accumulation rate of nitrite were all higher, which fitted for the nitrosation reaction. Conclusion] Under the condition of temperature of 28 -33 ℃ and the inlet ammonia nitrogen concn, of 80 - 110 mg/L, controlling alkalinity and DO could make the well accumulation of the nitrite in the reactor.