首页|梯度曝气A2O2-MBR工艺强化同步硝化反硝化效能

梯度曝气A2O2-MBR工艺强化同步硝化反硝化效能

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针对城镇污水厂对低C/N比污水脱氮效果差、能耗高的问题，研发了梯度曝气A2O2-MBR工艺，设置单独的低氧池(O，池)和好氧池(O2池)，O1和O2池DO质量浓度逐步降至0。6 mg·L-1和1。7 mg·L-1。进水碳氮比(C/N)从6。0逐步降至5。0和4。0，总氮(TN)去除率保持在85％左右。O1和O2池同步硝化反硝化效率保持在90％左右，O池(O1池+O2池)和膜池对TN去除的贡献在82。5％以上，对COD去除的贡献在64。9％～83。2％。高通量测序结果表明，在低DO低C/N比条件下，系统中亚硝酸盐氧化菌(nitrite-oxidizing bacteria，NOB)丰度下降，反硝化聚糖菌(denitrifying glycogen accumulating organisms，DGAOs)丰度增加;反硝化菌类群丰富，其中Pseudomonas的丰度最高，Thauera和Zoogloea在低C/N比条件下丰度增加。大部分TN通过常规异养反硝化菌(denitrifying bacteria，DNB)去除，DGAOs的贡献较小。与启动阶段相比，O1池和O2池总曝气量下降了 44。2％。结果表明，通过采用梯度曝气方式，并逐步降低DO浓度，可促进功能菌的富集，强化SND作用，改善TN去除效果，并降低能耗。
Enhanced SND performance of step-wise aeration A2O2-MBR process
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.

municipal wastewaterbiological nitrogen removalsimultaneous nitrification and denitrification(SND)DO controlhigh-throughput gene sequencing

刘钢、王丽、温榛煌、谌建宇、黎京士、何伟、梅嘉鑫、张宇

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生态环境部华南环境科学研究所,广州 510655

中国建筑第四工程局有限公司,广州 510000

广东环境保护工程职业学院,佛山 528216

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

中央级公益性科研院所基本科研业务费专项中建四局科技研发课题

PM-zx703-202104-130CSCEC4B-2021-KTA-6

2024

10.12030/j.cjee.202311030

环境工程学报
中国科学院生态环境研究中心

环境工程学报

CSTPCD北大核心
影响因子：0.804
ISSN：1673-9108
年,卷(期)：2024.18(4)
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