环境工程学报2024，Vol.18Issue(4)：1130-1143,14.DOI:10.12030/j.cjee.202311030
梯度曝气A2O2-MBR工艺强化同步硝化反硝化效能
Enhanced SND performance of step-wise aeration A2O2-MBR process
摘要
Abstract
Aiming at poor denitrification effect and high energy consumption when treating the wastewater with the low C/N ratio in wastewater treatment plant(WWTPs),a step-wise aeration A2O2-MBR process was developed.The separated low-oxic zone(O1)and oxic zone(O2)were design with the DO concentrations decreased gradually to 0.6 mg·L-1 and 1.7 mg·L-1,respectively.When the influent C/N ratio decreased from 6.0 to 5.0 and 4.0,the total nitrogen(TN)removal efficiency maintained at around 85％.The simultaneous nitrification and denitrification(SND)efficiency of the O1 and O2 zones kept at around 90％.Both O zones(O1+O2)and membrane zones contributed to above 82.5％of TN removal,and 64.9％～83.2％of COD removal.High-throughput gene sequencing showed that,under low DO and low C/N ratio conditions,the abundance of nitrite-oxidizing bacteria(NOB)decreased,while the abundance of denitrifying glycogen accumulating organisms(DGAOs)increased.Rich denitrifiers occurrred,of which the abundance of Pseudomonas was highest.Besides,the abundance of Thauera and Zoogloea increased under low C/N ratio condition.Most of TN was removed by ordinary denitrifying bacteria(DNB),rather than DGAOs.Compared with the startup stage,the total aeration rate of the O1 and O2 zones decreased by 44.2％.The results showed that the step-wise aeration mode could gradually lower the DO concentrations,enrich the functional bacteria,then enhance the SND effect,increase TN removal,save the energy consumption.关键词
城镇污水/生物脱氮/同步硝化反硝化/溶解氧控制/高通量测序Key words
municipal wastewater/biological nitrogen removal/simultaneous nitrification and denitrification(SND)/DO control/high-throughput gene sequencing分类
资源环境引用本文复制引用
刘钢,王丽,温榛煌,谌建宇,黎京士,何伟,梅嘉鑫,张宇..梯度曝气A2O2-MBR工艺强化同步硝化反硝化效能[J].环境工程学报,2024,18(4):1130-1143,14.基金项目
中央级公益性科研院所基本科研业务专项(PM-zx703-202104-130) （PM-zx703-202104-130）
中建四局科技研发课题(CSCEC4B-2021-KTA-6) （CSCEC4B-2021-KTA-6）
