摘要
河南省某污水处理厂采用改良氧化沟工艺,在运行中存在脱氮除磷效果欠佳的问题。为了降低该厂的运行能耗,并提高对氮、磷的去除效率,采用低氧控制策略,对氧化沟好氧区的供气量进行了优化控制。通过削减氧化沟前端的曝气量,同时控制氧化沟出口的溶解氧为1～1.5mg/L,在氧化沟前端形成缺氧区,为反硝化除磷和同步硝化反硝化创造条件,并将原有的缺氧/厌氧/好氧运行方式更改为缺氧/厌氧/缺氧/好氧运行方式。稳定运行后,氧化沟出水水质得到大幅度提升,二沉池出水TN、TP平均浓度仅分别为9.0 mg/L和0.19 mg/L,达到了《城镇污水处理厂污染物排放标准(》GB 18918—2002)中一级A标准的要求;处理电耗平均为0.241 kW.h/m3,与调试前相比降低了20%以上。
The efficiency of nutrient removal was poor in operation of modified Carrousel oxidation ditch used in a WWTP in Henan Province. In order to reduce energy consumption and improve the nutrient removal rate, low oxygen control strategy was adopted, and the control of air supply in the aerobic zone was optimized. By reducing the quantity of aeration at the front end of oxidation ditch and controlling the DO between 1 and 1.5 mg/L at the exit of oxidation ditch, an anoxic zone was formed at the front end of oxidation ditch, creating the conditions for denitrifying phosphorus removal and simultaneous nitrifica-tion and denitrification. The operation of the oxidation ditch was changed from anoxic/anaerobic/aerobic modes to anoxic/anaerobic/anoxic/aerobic modes. After stable operation, the effluent quality is substantially improved. The average concentrations of TN and TP in the effluent are only 9.0 mg/L and 0.19 mg/L respectively, meeting the first level A criteria specified in Discharge Standard of Polhttants for Mu- nicipal Wastewater Treatment Plant （GB 18918 -2002）. The average power consumption for wastewater treatment is 0. 241 kW · h/m3 , reducing by more than 20% compared with that before the commissioning.
出处
《中国给水排水》
CAS
CSCD
北大核心
2011年第13期8-11,共4页
China Water & Wastewater
基金
河南省重大公益性科研项目(081100910300)
河南省重点科技攻关项目(092102310223)
河南省基础与前沿技术研究计划项目(102300410197
102300410195
092300410173)
新乡市科技发展计划项目(09S067)
河南师范大学博士科研启动资金资助项目(080305)
关键词
污水处理厂
节能降耗
脱氮除磷
溶解氧
改良氧化沟
WWTP
energy saving and consumption reducing
nitrogen and phosphorus removal
dissolved oxygen
modified Carrousel oxidation ditch
