底部曝气DE氧化沟、多级AO分别与MBBR组合工艺在污水处理厂提标改造中的应用

Application of MBBR process combine with DE-type oxidation ditch with bottom aeration and multi-stage AO tank in upgrading of urban wastewater treatment plant

西安市北石桥污水处理厂现状总规模15万m^(3)/d。提标改造将现状表面转刷曝气DE氧化沟改造为底部曝气DE氧化沟-MBBR组合工艺;在现状多段多级AO池中投加填料,改造为与MBBR组合工艺。改造工程采用预处理-多级AO-DE氧化沟-高效沉淀池-反硝化深床滤池-臭氧接触池-接触消毒池组合工艺,出水主要污染物指标执行《地表水环境质量标准》(GB 3838-2002)准Ⅳ类标准。

Xi’an Beishiqiao urban wastewater treatment plant has a total scale of 15×10^(4)m^(3)/d.In the upgrading project,the current oxidation ditch with aerobic brush was upgraded into MBBR process combine with DE-type oxidation ditch;the current multi-stage AO tank was transformed into a combined process with MBBR,which was filled with fillers.In the upgrading project,the combined process of pretreatment-multi-stage AO-DE oxidation ditch-high efficiency sedimentation-Denitrification deep-bed filter-ozonation contact reactor-contact disinfection tank.The main pollutants in the effluent were aimed to reached classⅣof Surface water environmental quality standard(GB 3838-2002).