MBBR耦合MBR用于东北某低温高排放标准污水厂

Application of MBBR Coupled with MBR Process in a Stringent Discharge Standard Wastewater Treatment Plant in Northeast China at Low Temperature

长春市某污水厂现状执行一级A排放标准,处理工艺为A~2/O+MBR,现要求同时提标提量,出水水质需提升至地表水准Ⅲ类标准,处理规模由2.5×10^(4)m^(3)/d提升至6×10^(4)m^(3)/d。提标扩容项目的难点和核心在于低温下实现高标准排放,综合考虑进出水水质和现有工艺运行情况,新建系统和现有设施改造均采用MBBR+MBR组合工艺。项目运行后出水水质稳定,其中出水氨氮均值为0.57 mg/L、TN均值为7.86 mg/L,在水质冲击和低温条件下出水仍可稳定达标。改造后MBR膜组件清洗周期延长50%,降低了运维成本。MBBR+MBR组合工艺脱氮负荷高、占地省、抗冲击能力强,适用于低温地区高排放标准污水处理厂改造或新建。

The present treatment process of a wastewater treatment plant in Changchun was A~2/O and MBR,and the effluent quality was required to meet first level A discharge standard.Now,it is required to raise the discharge standard and treatment scale simultaneously:the effluent quality is required to upgrade to surface water quasiⅢclass standard,and the treatment scale should be raised from 2.5×10^(4)m^(3)/d to 6×10^(4)m^(3)/d.The key problem of the project is to achieve stringent discharge standard at low temperature.Considering the quality of influent and effluent and the operation of the existing process,the MBBR and MBR combined process was selected in both the new system and the upgrading project.The effluent quality was stable after the upgrading of the project.The average ammonia nitrogen in effluent was 0.57 mg/L,and the average TN in effluent was 7.86 mg/L.Under the condition of water quality shock and low temperature,the effluent quality still stably reached the discharge standard.After the upgrading,the cleaning cycle of MBR membrane module was extended by 50%and the operation and maintenance cost was reduced.The MBBR and MBR combined process has high nitrogen removal load small footprint area and strong impact resistance,which is suitable for upgrading or new construction of stringent discharge standard wastewater treatment plant in low temperature regions.