投加厨余发酵产物强化MBR的脱氮除磷效果

实验中采用一体式膜生物反应器处理低有机负荷校园生活污水,但是碳源不足严重制约了该工艺的生物脱氮除磷效果,故以厨余厌氧发酵产物作为外加碳源,考察投加碳源对MBR处理效果的影响。结果表明,厨余发酵液的投加对COD、NH4+-N的去除效果影响不大,出水浓度分别在20 mg/L、1 mg/L以下;外加碳源促进了营养物质的去除,TN的出水平均浓度由18.7 mg/L降至7.6 mg/L,TP的出水平均浓度由1.8 mg/L降至0.9 mg/L。同时污泥混合液中MLVSS/MLSS由54%提高至65%,污泥沉降性能提升,EPS含量减少,污泥粘度降低。

Adding fermentation products of kitchen garbage to enhance nitrogen and phosphorus removal in MBR

In this study, a submerged membrane bioreactor was applied to the treatment of low loading campus wastewater, while lack of carbon source was the main factor restricting biological nitrogen and phosphorus removal. As external carbon source, the effect of anaerobic fermentation product of kitchen garbage on treatment performance was investigated in the MBR. The results showed that external carbon source had little effect on COD and NH4+-N removal, with effluent concentrations of them were less than 20 mg/L and 1 mg/L, respectively. Adding external carbon obviously improved the removal of nutrients, with TN and TP average effluent concentrations decreasing from 18.7 mg/L and 1.8 mg/L to 7.6 mg/L and 0.9 mg/L, respectively. Moreover, sludge properties such as MLVSS/MLSS and settling ability increased, while EPS content and viscosity decreased.