摘要
某城区污水处理厂位于湖北省孝感市孝南区,总处理规模为14万m^(3)/d,采用改良百乐卡AAO为主体工艺,提标前出水执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级B标准,提标后执行一级A标准。厂区现有用地极为紧张,预留地块面积小且所处位置不利使用,但又无法新增用地。文中基于用地、工艺流程等现实边界条件进行了巧妙构思,在现有百乐卡AAO生物池前端增设厌氧/缺氧反应池,优化了生物系统格局,通过降低TN负荷率,并同步采用多种技术措施强化生物脱氮除磷,充分挖潜了二级生物处理能力确保TN达标,解决方案简单而高效;提标吨水投资仅为640元,提标处理单元电耗为0.096 kW·h/m^(3)。目前,提标后已运行两年多,提标改造后的二级生物处理系统运行良好,TN平均去除率由54.0%提高至69.0%,TP平均去除率由85.0%提高至94.0%;出水TN平均质量浓度为7.9 mg/L,去除率为63.0%~72.0%;出水TP平均质量浓度为0.2 mg/L,去除率为90.0%~96.0%。
A urban wastewater treatment plant(WWTP)with a total treatment capacity of 140000 m^(3)/d is located in Xiaonan District,Xiaogan City,Hubei Province,and the main process is modified BIOLAK AAO.The tailwater may comply with the first class B criteria of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants(GB 18918—2002)before upgrading,and it should be implemented as the first class A criteria after the upgrading and reconstruction.The existing land in the factory area is extremely tight,the reserved land is small and the location is unfavorable for use,but it is impossible to add new land.The design scheme is ingeniously conceived based on the actual boundary conditions such as land use and process flow.An anaerobic/anoxic reaction tank is added in front of the existing BIOLAK AAO biological tank to optimize the biological system pattern.By reducing the TN load rate and simultaneously adopting a variety of technical measures to strengthen biological nitrogen and phosphorus removal,the secondary biological treatment capacity is fully tapped to ensure that the TN meets the standard,the solution is simple and efficient.The investment for raising the standard per ton of water is only 640 yuan,and the power consumption of raising the standard processing unit is 0.096 kW·h/m^(3).At present,it has been running for more than two years after the upgrading and reconstruction,and the secondary biological treatment system after the upgrading and reconstruction runs well.The average removal rate of TN is increased from 54.0%to 69.0%,and the average removal rate of TP is increased from 85.0%to 94.0%.The average mass concentration of TN in effluent is 7.9 mg/L,and the removal rate is 63.0%~72.0%.The average mass concentration of effluent TP is 0.2 mg/L and the removal rate is 90.0%~96.0%.
作者
孙巍
赵红兵
张卫东
SUN Wei;ZHAO Hongbing;ZHANG Weidong(Central and Southern China Municipal Engineering Design and Research Institute Co.,Ltd.,Wuhan430014,China)
出处
《净水技术》
CAS
2022年第6期156-161,169,共7页
Water Purification Technology
关键词
提标改造
改良百乐卡
AAO
工艺
强化生物脱氮除磷
多点进水
厌氧区与缺氧区切换
upgrading and reconstruction modified BIOLAK AAO
enhanced biological nitrogen and phosphorus removal
multiple water inlet points
switchover between anaerobic and anoxic zones
