高排放标准下某城镇污水处理厂生物处理性能解析

Analysis of Biological Treatment Performance of a Municipal Sewage Treatment Plant under High Discharge Standard

研究了执行地方排放标准的某城镇污水处理厂生物处理系统的脱氮除磷效果和影响因素。研究表明,采用改良A/O工艺辅助外投加碳源,二沉池出水TN和NH4+-N分别稳定保持在10 mg/L和1.5 mg/L以下浓度水平,出水TP需要依靠深度处理工艺进一步降低浓度。尽管预缺氧池消减了回流污泥硝态氮对厌氧释磷的影响,但进水碳源不足显著影响了生物厌氧释磷和反硝化脱氮功能,好氧池的溶解氧浓度有必要优化控制,以节能降耗并消除对后续缺氧区脱氮的影响。

The effect and influencing factors of nitrogen and phosphorus removal in the biological system of a municipal sewage treatment plant that implements local discharge standards were discussed.The results showed that TN and NH+4+-N from secondary effluent were stable below 10 mg/L and 1.5 mg/L,which adopted multi-stage improved A/O process.Meanwhile,TP of effluent needed to be further reduced by advanced treatment process.The insufficient carbon in the influent limited the functions of biological anaerobic phosphorus release and denitrification nitrogen removal.Although the pre-anoxic tank reduced the influence of nitrate nitrogen and dissolved oxygen in the returning sludge,the significant reduction of carbon resulted in no anaerobic phosphorus release in summer It is necessary to optimize the concentration of dissolved oxygen in the aerobic tank,which could save energy,reduce consumption and eliminate the influence on the subsequent denitrification in the anoxic zone.