辽宁科技学院学报

本研究采用SBR系统，以不同含氮量的模拟生活污水为进水，考察进水氮源不足条件对SBR系统中活性污泥沉降性能和有机物降解能力的影响。实验结果表明，当m(BOD₅)∶m(N)=100∶4时，短期内(13 d)污泥浓度保持在3 300 mg/L以上，SV值为23%,SVI值为68 mL/g,COD去除率达到92%以上，镜检观察到的菌胶团密实、透明，SBR系统运行正常。随着缺氮程度的继续加重，当m(BOD₅)∶m(N)≥100∶3时，SV值低于15%、SVI值小于50 mL/g，活性污泥中菌胶团松散直至解体，微生物活性低，混合液沉淀后的上清液变浑浊；但在运行末期，污泥浓度仍然保持在3 000 mg/L以上，COD去除率也能达到80%以上。

The SBR system was utilized to investigate the effect of simulated domestic sewage with different nitrogen contents on the sedimentation performance and organic matter degradation ability of activated sludge under the condition of insufficient nitrogen source. The results showed that when the m(BOD₅)∶m(N)=100∶4, the sludge concentration, SV value, SVI value as well as COD removal rate becomes higher than 3 300 mg/L, 23%, 68 mL/g and above 92% respectively in a short period of time(13 days). The microscopic observation revealed that the zoogloea is dense and transparent, and the SBR system operates normally. As the degree of nitrogen deficiency increases with m(BOD₅)∶m(N)≥100∶3, SV value below 15%,SVI value below 50 mL/g, the bacterial micelles in the activated sludge are loose until disintegrated, the microbial activity is low, and the supernatant after the precipitation of the mixed solution becomes turbid. At the end of the operation, however, the sludge concentration remains above 3 000 mg/L, and the COD removal rate can reach more than 80%.