改良型MSBR与反硝化深床滤池工艺在西北地区污水厂提标改造中的应用

Application of Modified MSBR and Denitrifying Deep Bed Filter Processes in Upgrading and Reconstruction of WWTPs in Northwest Region

西北地区M城镇污水处理厂最终排放水体以黄河为主要支流。为积极响应国务院关于黄河流域生态保护相关要求,针对该污水处理厂出水水质标准低、原有生物处理单元水质和水量变化适应性差以及出水浮渣量大等问题进行提标改造。在原有设备改造、完善的基础上,采用城市污水→粗格栅→集水池→提升泵→细格栅→曝气沉砂池(新建)→改良型MSBR池(改造原有CAST池)→中间提升泵房(新建)→高效沉淀池(新建)→反硝化深床滤池(新建)→接触消毒池→一级A达标外排工艺技术,污水厂出水标准由一级B提高至一级A,同时污水厂处理能力由60 000 m^(3)/d扩容至100 000m^(3)/d,通过对连续稳定运行一年的系统中的经济性指标分析可知该方案具有良好的经济效益,能够作为西北地区污水处理厂提标改造的参考方案。

The final discharge water body of M urban wastewater treatment plant(WWTP)in northwest China takes the Yellow River as its main tributary.In order to actively respond to the requirements of the state council on ecological protection in the yellow river basin,the WWTP had been upgraded and reconstruted to address issues such as low effluent quality standards,poor adaptability to changes in water quality and quantity of the original biological treatment unit,and large amount of effluent floating slag.On the basis of the reconstruction and improvement of the original equipment,the use of urban sewage→coarse grid→sump→lifting pump→fine grid→aeration grit tank(new)→improved MSBR tank(transformation of the original CAST tank)→intermediate lifting pump room(new)→high-efficiency sedimentation tank(new)→denitrification deep bed filter(new)→contact disinfection tank→level A standard was discharged to the Weihe River process technology,the effluent standard of the WWTP is increased from class B to class A,and the treatment capacity of the WWTP is expanded from 60000m^(3)/d to 100000m^(3)/d.Through the analysis of the economic indices in the continuous and stable operation of the system for one year,it can be seen that the scheme has good economic benefits and can be used as a reference scheme for the upgrading and reconstruction of WWTP in Northwest China.