餐厨垃圾/市政污泥/城市粪便联合厌氧消化沼液处理设计

Design of Treatment Process of Biogas Slurry from Anaerobic Co-digestion of Kitchen Waste/Municipal Sludge/Urban Excrement

针对北京某有机质生态处理站餐厨垃圾、市政污泥、城市粪便联合厌氧消化产生的沼液等综合废水特点,采用生物+物化组合工艺,即:预处理+外置式膜生物反应器(MBR,两级硝化反硝化+超滤)+部分纳滤(NF)处理工艺,纳滤产生的浓缩液采用中温催化氧化工艺进行处理,最终实现废水达标排放。该工程设计处理规模为700 m3/d,工程运行结果表明,该工艺运行稳定、效果良好,综合出水水质达到《污水综合排放标准》(GB 8978—1996)中的三级标准,其中氨氮和总氮指标达到北京市地方标准《水污染物综合排放标准》(DB 11/307—2013)。

Based on analyzing characteristics of biogas slurry water quality from anaerobic co-digestion of kitchen waste,municipal sludge and urban excrement in an organic ecological treatment station in Beijing,a biological and physicochemical combination process was employed,which consisted of pretreatment,external membrane bioreactor(MBR,two-stage nitrification/denitrification and ultrafiltration)and partial nanofiltration(NF).Concentrate produced by the nanofiltration was treated by mesophilic catalytic oxidation process,and the effluent quality could finally reach the discharge standard.The designed treatment capacity of this project was 700 m3/d.The operational results indicated that the process was stable and had a good performance.The comprehensive effluent quality reached the third level limitations of Integrated Wastewater Discharge Standard(GB 8978-1996),among which ammonia nitrogen and total nitrogen met the limitations of the Beijing local standard Integrated Discharge Standard of Water Pollutants(DB 11/307-2013).