反硝化滤池+臭氧活性炭在高标准城镇污水处理厂原位提标改造中的应用

Application of Denitrification Filter and Ozone Activated Carbon in In-Situ Upgrading of High-Standard Urban WWTP

随着国家提高敏感流域污水厂排放标准的政策出台,以“混凝沉淀+过滤”为主的传统提标工艺已无法满足高标准排放的要求,新的提标改造工艺方案亟待提出。文中介绍了湖北中部某污水厂由现状一级B排放标准提标至“准地表Ⅲ类水”标准(SS<10 mg/L,TN<5 mg/L,COD_(Cr)、BOD_(5)、氨氮、TP执行地表Ⅲ类水标准)的工程案例。工程内容分为改造与提标两部分,根据污水厂运营问题及高标准排放要求,制定了满足两部分要求的组合工艺——扩建生化系统+混凝沉淀+反硝化滤池+过滤+臭氧氧化+活性炭池,并对各构筑物详细参数及项目竣工后的运行效果进行了介绍与分析。结果表明,应用原位改造与提标工艺相结合的组合工艺可以有效提高污水厂处理效果,出水可以稳定达到“准地表Ⅲ类水”的高标准排放要求。

With the introduction of the national policy to improve the discharge standards of wastewater treatment plants(WWTPs)in sensitive basins,the traditional upgrading process based on"coagulation and precipitation+filtration"has been unable to meet the requirements of high discharge standards,and a new upgrading process needs to be proposed urgently.This paper introduces an engineering case:a WWTP located in the middle of Hubei Province,which has been upgraded from the first class B criteria discharge standard to quasi-classⅢsurface water standard(SS<10 mg/L,TN<5 mg/L,COD_(Cr),BOD_(5),ammonia nitrogen,and TP implement the classⅢsurface water standard).The project consists of two parts:reconstruction and upgrade.This paper describes the current operation problems and their solutions in detail given the actual influent and effluent quality and the high standard discharge requirements,formulating a comprehensive process of"expansion of biochemical system+coagulation sedimentation+denitrification filter+filtration+ozone oxidation+activated carbon filter".The details of each structure's parameters and the operational impacts after the project completion are also being introduced and analyzed.The results indicate that the ideal combination of in-situ transformation and standard upgrading process can effectively improve the WWTP's treatment efficacy while the effluent can stably meet the quasi-classⅢsurface water standard.