进水碳氮比对连续流双污泥系统氮磷去除的影响

采用连续流双污泥系统模拟污水处理中试试验,通过改变碳源投加量实现不同C/N比,探究连续流双污泥系统C/N比对污染物去除效果的影响及作用机制。结果表明:连续流双污泥系统在不同进水C/N下,均能取得稳定的脱氮除磷效果;随C/N比升高,反硝化作用增强,TN去除率相应升高,C/N比值为5、6时,平均去除率可达86%;C/N比对氨氮去除效果影响较小;C/N比对TP去除效果影响显著,C/N比值为3时TP去除率最高,平均去除率为93%,随C/N比增高去除率逐渐下降,C/N比值为6时TP平均去除率仅为61%。可见,连续流双污泥系统对进水C/N比偏低的生活污水有着更好的处理效果。

Effect of Inflow Water C/N Ratios on Nitrogen and Phosphorus Removal in Continuous- Flow Double Sludge System

The pollutants removal efficiencies and function mechanism of continuous flow double sludge system were explored un- der various C/N ratios through adding different carbon sources and adopting a simulated pilot test of sewage treatment. Results indi- cated that continuous flow double sludge system in different C/N ratios all can obtain stable nitrogen and phosphorus removal effect. Denitrification could be strengthen with C/N ratios rising, and the removal efficiency of TN would go up. The average removal effi- ciency of 86 % were obtained at the C/N ratios of 5 and 6. C/N ratios effected the removal of ammonia nitrogen less while it had a significant influence on TP removal efficiency. The removal rate of TP decreases gradually with increasing of C/N ratios. When the C/ N ratio was 3, TP removal efficiency reached a peak, the highest for 93%, but the average removal rate only got 61% under the ratio of 6. These results demonstrated that continuous flowing double sludge system had a better treatment effect for low C/N ratio sewage.