内回流混合液DO对缺氧池反硝化影响预测模型研究

Forecast Model for Impact of Dissolved Oxygen in Internal Reflux Mixture on Denitrification in Anoxic Tank

污水处理厂内回流混合液所携带的DO进入缺氧池将直接影响缺氧池脱氮效果。采用动态模拟试验的方法,对前期研究提出的"内回流混合液挟氧对缺氧池反硝化脱氮影响理论预测模型"中影响系数k值进行研究。结果表明,在内回流比为100%、200%、300%的情况下,内回流混合液DO导致系统TN去除量的降低值分别为(1.84±0.08)、(3.72±0.20)、(5.84±0.32)mg/L,据此计算模型中影响系数k值分别为(1.12±0.05)、(1.21±0.06)、(1.29±0.07);将水力停留时间由1 h调整为2 h,k值变化不显著。

Dissolved oxygen in internal reflux mixture may directly affect the nitrogen removal effi- ciency in anoxic tank in WWTP. The dynamic simulation experiment method was used to study the value k namely an influence coefficient in the mathematical model used for predicting the impact of dissolved oxygen in internal reflux mixture on denitrification in anoxic tank. The results showed that the removal rates of TN were reduced by （ 1.84 ± 0.08 ） rag/L, （3.72 ± 0.20） mg/L and （5.84±0.32 ） mg/L when the internal reflux ratios were 100% , 200% and 300%, respectively. Hereby, the value k was 1.12 ±0.05, 1.21 ±0.06 and 1.29 ±0.07, respectively. The change of value k was not significant when the hydraulic retention time was adjusted from 1 h to 2 h.