改良A^2/O氧化沟强化生化处理技术用于污水厂提标改造

Application of Improved A^2/O Oxidation Ditch Enhanced Biochemical Treatment Process for Upgrading the Wastewater Treatment Plant

由于排放标准提高和污水量增加,珠海某水质净化厂出水水质由《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准提高至《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准及广东省地方标准《水污染物排放限值》(DB 44/26-2001)的较严值,同时设计规模由3×10^4m^3/d扩建至8×10^4m^3/d。水质净化厂原处理工艺为改良A^2/O氧化沟,提标工程针对进水含有工业废水、生化性较差的特点,设水解酸化工艺提高污水生化性;生物处理保留改良A^2/O氧化沟工艺,采取提高污泥内、外回流比,增加曝气量等措施强化其脱氮除磷效果;深度处理采用精密过滤池去除SS。实际运行数据表明,提标扩建后出水水质稳定达到设计标准。提标扩建充分利用生物处理解决脱氮除磷问题,简化处理流程,减少了工程投资和运行费用。

Due to the improvement of discharge standards and the increase of sewage quantity,the effluent quality of a WWTP in Zhuhai was raised from the first class B standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002)to the stricter value between the first class A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002)and the Guangdong Provincial local standard of Discharge Limits of Water Pollutants(DB 44/26-2001).The design scale was expanded from 3×10^4 m^3/d to 8×10^4 m^3/d.The original treatment process of the WWTP was improved A^2/O oxidation ditch.The upgrading project aimed at the characteristic of the influent contained industrial wastewater and the biochemical property was poor.The hydrolytic acidification process was set up to improve the biochemical property of the wastewater;the biological treatment retained the improved A^2/O oxidation ditch process,and the nitrogen and phosphorus removal effect was strengthened by increasing the internal and external reflux ratio of sludge and increasing aeration;the SS was removed by precision filter in advanced treatment.The actual operation data showed that the effluent quality was stable up to the design standard after upgrading.In the project,biological treatment was fully used to solve the problem of nitrogen and phosphorus removal,the treatment process was simplified,and the project investment and operation cost was reduced.