多模式A^(2)O+V型反硝化滤池在污水处理中的应用

Application of Multi-mode A^(2)O and V-type Denitrification Filter in Wastewater Treatment

南京某污水厂扩建工程设计规模为10×10^(4) m^(3)/d,以处理生活污水为主,设计出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准,并预留提升空间。在分析现状污水处理厂进水水质、处理工艺及运行情况的基础上,结合水质处理目标,采用曝气沉砂池+多模式A^(2)O+高效沉淀+V型反硝化滤池+次氯酸钠消毒处理工艺。多模式A^(2)O工艺能够实现运行方式的灵活切换,V型反硝化滤池在兼顾对悬浮物截留去除的同时,还具有良好的TN去除能力,使系统脱氮性能有较大的提升空间,能够满足更高的TN排放标准。工程运行结果显示:该组合工艺具有良好的适应能力,出水水质达到并优于设计标准。工程总投资约3.99亿元,处理成本为1.06元/m^(3),实际运行电耗为0.28~0.30 kW·h/m^(3)。

The design scale of a wastewater treatment plant expansion project in Nanjing is 10×10^(4) m^(3)/d,and it is mainly for the treatment of domestic sewage.The design effluent quality shall comply with the first level A limit specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002),and the space for effluent quality improvement is reserved.Based on the analysis of the current influent quality,treatment process and operation of the wastewater treatment plant,the process of aerated grit chamber,multi-mode A^(2)O,high-efficiency precipitation,V-type denitrification filter and sodium hypochlorite disinfection was adopted to realize the treatment target.The multi-mode A^(2)O process realized the flexible switching of operation modes.In addition,the V-type denitrification filter removed the suspended solids through interception,and showed good TN removal performance.The results indicated that the nitrogen removal performance of the system had a large space for effluent quality improvement and was capable of meeting stricter TN discharge standards.The operational results showed that the combined process had good adaptability,and the effluent quality reached and was even superior to the design discharge standard.The total investment of the project was about 399 million yuan,the treatment cost was 1.06 yuan/m^(3),and the actual operating power consumption was between 0.28 and 0.30 kW·h/m^(3).