某市政污水与餐厨垃圾协同处理工程设计

Engineering Design of Joint Facility Construction for Municipal Wastewater and Food Waste Treatment

原苏州市某污水处理厂是一座处理规模为2万m^(3)/d的市政污水处理厂,本次工程设计方案考虑利用厂区预留用地,将市政污水处理规模扩建至4万m^(3)/d,并同时新建一组处理规模为200 t/d的餐厨垃圾处理单元。通过市政污泥与餐厨垃圾混合厌氧消化提高了系统运行稳定性,厌氧消化产生的沼气经发电回用大大减少全厂运行电耗,厌氧消化产生的沼液在预处理后依托市政污水处理部分指标达到地表Ⅳ类水标准(TN除外),市政污水处理后的尾水作为再生水回用于餐厨垃圾处理。两者合建实现了优势互补,可提高土地利用率、节省工程总投资、降低运行成本,可作为有机废弃物处理工程建设的推荐模式。

A wastewater treatment plant(WWTP)in Suzhou City is a municipal WWTP with treatment scale of 20000 m^(3)/d.The reserved land of the plant is considered to expand the municipal wastewater treatment scale to 40000 m^(3)/d,as well as construct a food waste treatment unit with 200 t/d treatment scale.The operation stability of system is raised by the anaerobic digestion of mixture of municipal sludge and food waste.The operation power consumption of plant is highly reduced by the reclamation of biogas power generation by anaerobic digestion.Part indices of the effluent of biogas slurry is up to surface water classⅣwater standard(except TN)by the enhanced treatment of municipal wastewater unit after pre-treatment.The tail water of municipal wastewater treatment unit can be reused for the food waste treatment.The joint construction can reinforce complementary advantages.The land use capability can be improved,the project investment can be saved,and the operating costs can be reduced.It can be recommended as the construction mode of organic waste treatment.