MBR工艺用于山东省某污水处理厂扩建工程

MBR Process Used in Expansion Project of a Sewage Treatment Plant in Shandong Province

山东某污水处理厂现有设计规模为20×10^4m^3/d,采用氧化沟形式的AAO+纤维束过滤工艺,出水达到一级A排放标准。扩建工程规模为10×10^4m^3/d,占地面积4 hm2,设计出水COD≤45 mg/L、NH3-N≤2(3.5) mg/L、TP≤0.4 mg/L,其余指标需达到一级A标准。基于扩建工程占地面积小、出水标准高,设计采用预处理+AAO+MBR+紫外线消毒工艺,辅以化学除磷、投加碳源等措施,且厂区采用整体式布置,以节省占地。工程建成后,运行效果稳定,出水BOD5、COD、NH3-N、SS、TN、TP平均值分别为2.2、11.7、0.3、4.1、9.6、0.12 mg/L,均优于设计标准。

The existing design scale of a sewage treatment plant in Shandong is 20 × 10^4 m^3/d,using AAO in the form of oxidation ditch + fiber bundle filtration process. The effluent reached the first class A level criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant( GB 18918-2002). The scale of the expansion project is 10 × 10^4 m^3/d,covering an area of 4 hm2. The designed effluent COD≤45 mg/L,NH3-N≤2( 3. 5) mg/L,TP≤0. 4 mg/L,and the other indicators should reach the first class A level of GB 18918-2002. Based on the small footprint of the expansion project and high water discharge standards,the design adopted pretreatment + AAO + MBR +ultraviolet disinfection process,and supplemented by measures such as chemical phosphorus removal and carbon source addition. And the plant area adopted an overall layout to save land. After the project was completed,the operation effect was stable. The average values of BOD5,COD,NH3-N,SS,TN and TP of effluent water were 2. 2 mg/L,11. 7 mg/L,0. 3 mg/L,4. 1 mg/L,9. 6 mg/L and 0. 12 mg/L,respectively. All were better than design standards.