磷酸铵镁沉淀法与SBR工艺协同处理高含磷检修废水的研究

采用磷酸铵镁沉淀法和序列间歇式活性污泥法(SBR)协同处理高含磷检修废水,研究了磷酸铵镁反应中pH值、磷氮摩尔比、镁磷摩尔比等反应因素对高磷检修废水除磷效果的影响。结果表明,当反应中pH=9.5,n(Mg)∶n(P)∶n(N)=1.5∶1∶1时,高含磷检修废水总磷去除效果最佳,去除率可达到98%以上。采用该工艺对污水处理场高磷检修废水进行现场除磷预处理,总磷浓度由256 mg/L降至2.51 mg/L,总磷去除率达99%,效果显著。进一步SBR生化处理后,出水的pH值、COD、NH3-N、TP和SS等各项指标均符合GB 8978—1996《废水综合排放标准》一级标准,达到了预期的处理目标。

STUDY ON TREATMENT OF HIGH PHOSPHORUS WASTEWATER BY MAGNESIUM AMMONIUM PHOSPHATE PRECIPITATION METHOD AND SBR PROCESS

The high phosphorus wastewater was treated by magnesium ammonium phosphate precipitation method and Sequencing Batch Reactor Activated Sludge Process(SBR),and the influences of reaction factors such as pH,n(P)∶n(N),and n(Mg)∶n(P)in the magnesium ammonium phosphate precipitation method on the phosphorus removal effect of high phosphorus wastewater were studied.The results showed that When pH=9.5,n(Mg)∶n(P)∶n(N)=1.5∶1∶1,the total phosphorus removal efficiency of high phosphorus wastewater is the best,and the removal rate can reach 98%or more.Then this process was used to treat the high phosphorus wastewater in the wastewater treatment plant,which the effect of phosphorus removal in the field was remarkable.Its total phosphorus concentration was reduced from 256 mg/L to 2.51 mg/L,and the total phosphorus removal rate was as high as 99%.After further SBR biochemical treatment,the pH,COD,NH3-N,TP and SS of the effluent reached the first-level standard of GB 8978—1996 Integrated Wastewater Discharge Standard,thus expected treatment target was reached.