鄂尔多斯市某水质净化厂提标改造工程实践

Upgrading and Retrofitting Project of a Water Purification Plant in Ordos

鄂尔多斯市某水质净化厂主工艺采用改良型氧化沟+絮凝沉淀池+V型滤池,原出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。为使出水水质达到《地表水环境质量标准》(GB 3838—2002)准Ⅳ类标准,提出“现有处理设施改造+深度处理”的技术路线,将现有改良型氧化沟改造为具有强化脱氮功能的多段多级AO工艺,将现有絮凝沉淀池(机械絮凝+斜管沉淀工艺)改造为具有强化去除TP和SS功能的磁混凝高效沉淀池;深度处理段针对难生物降解有机物的去除,采用了生物焦吸附再生工艺。该水质净化厂提标改造后8个月的运行结果表明,出水水质稳定,各项指标均满足提标改造设计标准。

A water purification plant in Ordos adopted the main process of modified oxidation ditch,flocculation sedimentation tank and V-type filter.The original effluent quality carried out the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).In order to improve the effluent quality to level quasi-Ⅳspecified in the Environmental Quality Standard for Surface Water(GB 3838-2002),a technology route of existing treatment facilities modification and advanced treatment was proposed.The modified oxidation ditch was transformed into an anaerobic multi-level anoxic/oxic(AMAO)process.The flocculation sedimentation tank previously using mechanical flocculation and inclined tube precipitation process was changed into a magnetic coagulation sedimentation tank with the enhanced removal function of SS and TP.The process of absorption and regeneration of bio-coke is adopted in the advanced treatment section to remove refractory organic matter.The operation results of the water purification upgrading plant for eight months show that the effluent quality was stable and all the indexes met the discharge standards of upgrading and retrofitting design.