加压溶气生化气浮法处理生活污水的脱氮试验研究

Denitrification on pressured aeration-dissolved air flotation process for treating domestic wastewater

将加压溶气气浮技术与加压曝气生物氧化技术相结合,开发了加压溶气生化气浮(PA-DAF)法,用于处理生活污水。结果表明,DO和C/N对反应器的脱氮效果有显著影响。DO质量浓度提高到3.5mg/L后,氨氮去除率提高到将近99%。当DO质量浓度为2.5mg/L时,TN去除率达到最大值77.50%。高C/N条件下系统会抑制硝化能力。该反应器能很好地创造缺氧微环境,出现了同步硝化反硝化现象,并对其形成机制进行了分析。

A pressured aeration-dissolved air flotation reactor was developed by combining the pressurized aera- tion bio-oxidation technology and the dissolved air flotation process. The results showed that dissolved oxygen （DO） and C/N ratio significantly affected denitrification. When DO was more than 3.5 mg/L,the removal rate of ammonia nitrogen reached 99%. When DO was 2.5 mg/L, the removal rate of TN arrived at the maximum value which was 77.50%. The nitrification was inhibited at high C/N ratio. PA-DAF was advantageous to create anoxic condition for simultaneous nitrification and denitrification （SND） and the mechanism was debated.