低碳源条件下供氧模式对活性污泥系统脱氮性能的影响  

Effects of Aeration Strategy on Denitrifying Performance of Activated Sludge Processes in Treating Low-Carbon-Source Municipal Wastewater

作　　者：张欣瑞 池玉蕾 王倩[1] 金鑫[1] 石烜[1] 金鹏康[1] ZHANG Xin-rui;CHI Yu-lei;WANG Qian;JIN Xin;SHI Xuan;JIN Peng-kang(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境科学》2020年第7期3356-3364,共9页Environmental Science

基　　金：国家重点研发计划项目(2016YFC0400701);陕西省科技统筹创新工程计划项目(2016TZC-S-19-3);陕西省重点科技创新团队项目(2013KCT-13)。

摘　　要：通过对比采用连续曝气和间歇曝气两种供氧模式的活性污泥系统对低碳源污水的脱氮性能,探究低碳源条件下供氧模式对活性污泥系统脱氮性能的影响.结果表明,反应器进水C/N为3时,连续曝气系统的总氮去除率较间歇曝气系统高17.92%,碳源脱氮利用率较间歇曝气系统高44.29%,同时,连续曝气系统中反硝化菌相对丰度(5.86%)也高于间歇曝气系统(2.06%),说明连续曝气系统对低碳源污水的脱氮性能明显优于间歇曝气系统.另外,基于16S rRNA测序功能预测,连续曝气系统中微生物的膜输送功能、碳水化合物代谢功能以及细胞组成功能均强于间歇曝气系统,因此连续曝气系统中微生物可以更好地利用碳源生长代谢,进而更好地处理低碳源污水.本研究为应对城市污水处理厂进水碳源不足提供思路.In this study,the effects of aeration strategy on nitrogen removal performance of activated sludge processes in treating low-carbon-source municipal wastewater were investigated.Two aeration strategies(continuous aeration(CA)and intermittent aeration(IA))were evaluated,and the long-term performance of activated sludge processes employing these strategies in treating wastewater with C/N=3 were analyzed.The results demonstrated that the total nitrogen removal efficiency in CA was 17.92%higher than that in the IA process.Meanwhile,the carbon source utilized in nitrogen removal in CA was 44.29%higher compared with the IA process.Furthermore,the results of 16S rRNA sequencing showed that relative abundances of denitrifying bacteria in CA and IA were 5.86%and 2.06%,respectively,suggesting that the CA process has better denitrification ability when treating low-carbon-source wastewater.In addition,16S rRNA sequencing gene prediction was utilized to analyze the in-depth mechanisms.The results demonstrated that genes involved in membrane transport,carbohydrate metabolism,and cell composition were more highly expressed in CA.The enhancement of metabolic activity under continuous aeration strengthened microbial carbon source utilization.Therefore,the activated sludge process under continuous aeration was more efficient in treating low-carbon-source municipal wastewater.This study provides ideas for low-carbon-source municipal wastewater treatment.

关 键 词：低碳源 供氧模式 脱氮性能 碳源利用 基因预测 

分 类 号：X703[环境科学与工程—环境工程]