流量分配比对改良型多级A/O工艺去除污染物的影响

Influence of influent flow distribution ratios on pollutants removal by multi-stages A / O process

改良型多级A/O工艺处理低碳源(C/N<4.0)生活污水。在HRT为8 h、污泥回流比为60%、SRT为10 d的条件下,考察了流量分配比对系统去除有机物、TN、TP及硝化/反硝化能力的影响。结果表明:不同流量分配比(5∶3∶1∶1、1∶0∶0∶0、1∶1∶1∶1)对系统去除有机物及硝化能力的影响不大,出水COD、NH+4-N分别低于23.7、2.23 mg/L,但对系统脱氮除磷及反硝化能力的影响较大。流量分配比为5∶3∶1∶1时,系统能够有效利用进水碳源进行反硝化,且反硝化效果最好,出水TN、TP浓度分别为14.15和0.99 mg/L,去除率分别为79.6%和79.5%。总体而言,改良型多级A/O工艺对低碳源生活污水中污染物有很好的去除效果,这可为实际生活污水的处理提供理论依据。

To make full use of the carbon source in sewage and improve the removal efficiency of pollutants,a modified multistage A / O process was applied to treat sewage of a low carbon source（ C / N 4. 0）. The effect of different influent flow distribution ratios on the removal of organic matter,TN,TP,and nitrification and denitrification ability were investigated under the following conditions： HRT,8 h; sludge return ratio,60%; and SRT,10 d. The results showed that different flow distribution ratios（ 5∶ 3∶ 1∶ 1,1 ∶ 0 ∶ 0 ∶ 0,and 1 ∶ 1 ∶ 1 ∶ 1） had little influence on organic pollutant removal and nitrification ability,but greatly influenced the removal of nitrogen and phosphorus and denitrification efficiency. The effluent COD and NH＋4-N values were below 23. 7 and2. 23 mg / L,respectively. When the flow distribution ratio was 5∶ 3∶ 1∶ 1,the system could denitrify effectively using sewage as the carbon source,and this achieved the optimum efficiency of denitrification. The effluent TN and TP were 14. 15 and 0. 99 mg / L,respectively,and the removal efficiencies were 79. 6% and 79. 5%,respectively. In summary,a modified multistage A / O process offers great efficiency for the removal of pollutants in sewage with low carbon sources,and will provide a theoretical basis for domestic sewage treatment.