C/N和曝气时间对固体碳源SND处理低碳污水的影响

Influences of C/N and aeration time on solid carbon source SND treatment of low carbon wastewater

在SBBR反应器中以丝瓜络作为固体碳源和填料,采用同步硝化反硝化(SND)技术形成膜-SND系统处理城市低碳污水。试验研究了C/N(COD/TN)和曝气时间对处理效果的影响,并对系统生物相和挂膜前后丝瓜络表面形态进行分析。结果表明:C/N在10以内,反应周期内前4 h,COD可降解至30 mg/L以下,在C/N为2.5时,TN平均去除率可达79.1%,之后随C/N增加脱氮效果少量提高;最佳曝气时间为9 h,出水NH4+-N、TN分别为3.91、5.35 mg/L。

In the SBBR reactor,the membrane-SND system has been formed by using luffa sponge as solid carbon source and fillers,and simultaneous nitrification and denitrification（SND） used for treating the urban low carbon wastewater. Experimental research of the influences of C/N（COD/TN） and aeration time on the treatment effects has been investigated. The system biological phase and surface shape of luffa sponge before and after bio-membrane formation have been analyzed. The results show that when C/N is within 10,and in the first 4 hours of the reaction period,the COD can be reduced to below 30 mg/L;and when C/N is 2.5,the average removing rate of TN can reach 79.1%.Then,with the increase of C/N value,the removing rate of TN is increased a little. When the optimum aeration time is9 h,the effluent NH4^＋-N concentration and TN concentration are 3.91 mg/L and 5.35 mg/L,respectively.