生活污水PVA生物处理工艺

Treatment of domestic sewage by PVA biological process

采用PVA生物处理工艺对某高校生活污水(COD 140~270 mg/L,NH_4^+-N 20~50 mg/L)进行处理。结果表明:PVA生物系统(85 L)在容积负荷1.5 kg COD/(m^3·d)连续运行25 d,系统平均每天处理水量达到272 L,出水平均COD和NH_4^+-N浓度分别达到27.9 mg/L和1.3 mg/L,此外,经紫外消毒后最终出水菌落数降至1.0×10~4个/L以下;扫描电镜观察发现,PVA凝胶小球表面和内部均富含大量球菌、丝状菌和杆菌;该系统25 d连续运行过程中污泥产率仅为0.08MLSS/COD_(removed),无污泥外排。

Domestic sewage（ COD range from 140 to 270 mg / L,NH_4^＋-N range from 20 to 50 mg / L） from a university was treated by a PVA biological process（ 85 L）. The results showed that during 25 days continuous operation（ volumetric loading rates of 1. 5 kg COD /（ m^3·d））,the daily wastewater treatment capacity of the biological system reached 272 L / d and effluent COD and NH_4^＋-N were 27. 9 mg / L and 1. 3 mg / L,respectively.The final bacterial standard plate-count was below 1. 0 × 104 units / L by ultraviolet disinfection. Some Aureus,filamentous bacteria,and bacilli were observed in the outer and inner of PVA-gel beads by scanning electron microscope（ SEM）. And during 25 days continuous operation,the sludge yield was 0. 08 MLSS / CODremovedand only small amounts of sludge were discharged from the system.