The effect of bulk ammonium nitrogen concentration on partial nitrification was studied by maintaining the bulk ammonium nitrogen concentration at a predefined set point value through adjustment of influent flow rate .The mathematical simulation indicated that high bulk ammonium nitrogen concentration was needed in order to derive partial nitrification at low temperature and high DO condition .At temperature of 20 ℃ ,the bulk ammonium nitrogen concentration needed to be above 2 .0 ,3 .0 ,5 .0 mg/L in order to achieve 100％ accumulation of nitrite nitrogen and partial nitrification at DO concentration of 0 .6 ,1 .5 ,3 .0 mg/L respectively .For the temperature of 10 ℃ ,the corresponding ammonium nitrogen concentration needed to be above 5 .0 ,30 .0 ,30 .0 mg/L .The experimental results indicated that partial nitrification could be achieved at DO and ammonium nitrogen concentration of 1 .5 ,20 .0 mg/L .%通过调节进水流量,维持混合液氨氮浓度在某一设定值,在保持混合液中挥发性悬浮固体(VSS)浓度稳定的条件下,采用数学模拟和实验方法研究混合液氨氮浓度对短程硝化的影响.数学模拟结果表明,维持一定的混合液氨氮浓度对实现短程硝化有帮助,较低温和较高DO条件下,可通过提高混合液氨氮浓度来实现短程硝化;混合液DO分别为0.6、1.5、3.0 mg/L的条件下,20℃ 时需要维持混合液氨氮分别为2.0、3.0、5.0 mg/L以上才能达到100％ 的亚硝酸盐氮累积率,维持短程硝化,10℃ 时则需要维持混合液氨氮分别为5.0、30.0、30.0 mg/L以上.实验结果表明,在混合液DO为1.5 mg/L条件下,通过调节进水流量维持混合液氨氮为20.0 mg/L,实现了短程硝化过程,初步证明了数学模拟的结论.
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