嵌入式旁路污泥减量污水处理系统去除营养物特性

Nutrient Removal Performance of Incorporated Bypass Sludge Reduction Wastewater Treatment System

为了减少活性污泥工艺的剩余污泥产量以及解决目前污泥减量技术存在的问题,开发了一种集旁路污泥减量、污泥淤砂分离、侧流化学除磷、强化去除氮磷于一体的嵌入式旁路污泥减量污水处理系统。中试反应器规模为10 m3/d,并稳定运行超过90 d,出水NH+4-N、TN、TP、COD、p H值分别为(0.5±0.3)mg/L、(8.6±1.6)mg/L、(0.14±0.04)mg/L、(26.8±8.8)mg/L和7.75±0.31,出水水质能够稳定达到一级A标准。旁路系统的嵌入并没有造成主流系统出水水质恶化或波动,采用碱解污泥作为内碳源和排富磷上清液进行化学除磷强化了系统对氮、磷的去除性能。

An embedded bypass sludge reduction wastewater treatment system integrating sidestream sludge reduction, sludge and sand separation, side-stream chemical phosphorus removal and enhanced nutrient removal was developed to decrease the excess sludge yield in the activated sludge process and solve the problems of sludge reduction. The capacity of the pilot-scale reactor was 10 m3/d, and it operated stably for more than 90 d. The effluent concentration of NH4 - N, TN, TP, COD and pH were （0.5 ±0.3） mg/L, （8.6 ±1.6） mg/L, （0.14 ±0.04） mg/L, （26.8 ±8.8） mg/L and 7.75 ±0.31 respectively. The effluent quality could meet the first class A criteria. Incorporating of bypass system did not result in deterioration or fluctuation in the quality of the effluent from the main system. Meanwhile, the return of the alkali-treated sludge as an additional C-source and the recovery of phosphorus from the phosphorus-rich supernatant led to excellent nitrogen and phosphorus removal in this pilot-scale system.