雨季冲击条件下活性污泥呼吸图谱的变化

通过模型实验考察了雨季合流污水水量冲击以及冲击过后恢复初始状态过程中活性污泥的呼吸图谱变化规律。结果表明：雨季冲击下好氧池污泥浓度降幅较自、异养菌呼吸速率大；异养菌呼吸速率降幅较自养菌大。而COD去除率降幅小，NH4+-N去除率降幅大，与自养菌、异养菌呼吸速率的降幅不一致。表明异养菌虽受冲击影响较大，但因其所占污泥比例仍较大，COD处理的缓冲能力大；自养菌占污泥比例较小，虽受冲击的影响较小，但对NH4+-N处理的缓冲能力较小；另一方面，大雨冲击下自养菌呼吸比例上升10%，异养菌呼吸比例下降6%，表明在冲击过程中污泥中微生物结构有小幅变化。

Variation of activated sludge respiration under condition of hydraulic impact during rainy season

The influence of hydraulic impact loads from combined sewage during rainy seasons on activated sludge was studied in a laboratory-scale reactor by using a respiration map. The results showed that in the aeration tank, the decreasing amplitude of mixed liquor suspended solids (MLSS) was larger than that for the changes in heterotrophic bacteria and autotrophic bacteria respiration, and moreover, the decreasing amplitude of heterotrophic bacteria respiration was larger than that for autotrophic bacteria. However, the decreasing amplitude of the chemical oxygen demand (COD) removal efficiency was smaller than the changes for NH4+-N, which is not in conformance with the changes in bacterial respiration. These findings suggest that although heterotrophic bacteria are strongly affected by the hydraulic impact, the system's buffering ability to remove COD is large because the proportion of such bacteria in the sludge remains high. Conversely, while autotrophic bacteria are only slightly affected by the hydraulic impact, the system's buffer ability to remove NH4+-N is small because the proportion of such bacteria in the sludge remains low. On the other hand, under conditions of heavy rain shock, the autotrophic bacteria respiration ratio rose and the heterotrophic bacteria respiration ratio declined by about 10% and 6%, respectively, thus indicating that the microorganism structure of the sludge during shocks changes slightly.