臭氧投加量对二级出水中污染物去除效果的影响

Impact of ozone dosage on pollutants removal from secondary effluent

采用"混凝沉淀-臭氧(O3)-生物砂滤-活性炭(GAC)"组合工艺处理污水厂二级出水,考察了臭氧投加量对组合工艺处理效果的影响。结果表明,当臭氧投加量在1～5 mg/L时,组合工艺对NH4+-N、NO2--N、UV254和色度的平均去除率分别在70.61%、54.92%、20.63%和42%,其中当臭氧投加量为3 mg/L时,组合工艺对上述各项指标的去除效果最好,其NH4+-N、NO2--N、UV254和色度的去除率分别为99.41%、80.13%、28.06%和58.33%。"混凝沉淀-O3-生物砂滤-GAC"组合工艺深度二级出水能够有效去除水中的污染物质,提高深度处理出水水质,具有很好的应用前景。

The combined process of ＂coagulant sedimentation ＋ O3 ＋ bio-sand filter ＋ GAC＂was adopted to treat secondary effluent of wastewater treatment plant,and the impacts of ozone dosage on pollutants removal were investigated.The experiment results showed that the average removal rates of NH4^＋-N,NO2^--N,UV254 and chroma were 70.61%,54.92%,20.63% and 42%,respectively when the ozone dosage varied in a range of 1 to 5 mg / L,.When the ozone dosage was 3 mg / L,the process reached the highest removal rate of NH4^＋-N,NO2^--N,UV254 and chroma,which were 99.41%,80.13%,28.06% and 58.33%,respectively.It can be seen that combined process of ＂coagulant sedimentation ＋ O3 ＋ bio-sand filter ＋ GAC＂has a effectively pollutants removal rate in secondary effluent treatment,and it can improve the water quality comprehensively.The process has a bright prospect application in secondary effluent treatment.