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A2/O回流污泥快速启动厌氧氨氧化及其动力学特征

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第39卷 期数: 2023年第9期 页码: 1-9 栏目: 出版日期: 2023-05-01
Title:
Rapid Start-up of Anammox Seeded with A2/O Return Sludge and Its Kinetic Characteristics
作者:
王刚1,2,3,4， 袁林江1,2,3， 王茹1,2,3， 陈希2,3， 袁林杰1,2,3， 有小龙1,2,3
（1.西安建筑科技大学 环境与市政工程学院，陕西 西安 710055；2.陕西省环境工程重点实验室，陕西 西安 710055；3.西北水资源与环境生态教育部重点实验室，陕西 西安 710055；4.郑州市污水净化有限公司，河南 郑州 450000）
Author(s):
WANG　Gang1，2，3，4， YUAN　Lin-jiang1，2，3， WANG　Ru1，2，3， CHEN　Xi2，3， YUAN　Lin-jie1，2，3， YOU　Xiao-long1，2，3
（1. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Shaanxi Provincial Key Laboratory of Environmental Engineering， Xi’an 710055， China； 3. Northwest China Key Laboratory of Water Resources and Environmental Ecology， Xi’an 710055， China； 4. Zhengzhou Sewage Purification Co. Ltd.， Zhengzhou 450000， China）
关键词:
厌氧氨氧化;  接种污泥;  快速启动;  微生物群落;  动力学特征
Keywords:
Anammox;  seed sludge;  rapid start-up;  microbial community;  kinetic characteristics
摘要:
在接种城市污水处理厂A2/O工艺回流污泥的上流式厌氧污泥床（UASB）反应器中，采用逐渐提高进水基质浓度并缩短水力停留时间（HRT）的策略快速启动了厌氧氨氧化（Anammox），对反应器的脱氮效果及启动前后的微生物群落结构差异进行了分析。结果表明，Anammox启动成功仅耗时40 d，氨氮和亚硝态氮去除率均维持在90%以上，最大总氮去除负荷为0.99 kg/（m3·d），ΔNH4+-N∶ΔNO2--N∶ΔNO3--N=1∶1.28∶0.26，启动过程中反硝化作用对总氮去除的贡献由原来的83%逐渐降至12%，活性迟滞期末厌氧氨氧化菌的细胞产量达到了（1.37~13.75）×1010 个/d；在启动成功初期，厌氧氨氧化菌主要为Candidatus Brocadia（25.14%）和Candidats Jettenia（2.92%），在长时间运行过程中，Candidats Jettenia的丰度逐渐增至12.67%并成为优势菌属。通过构建动力学模型发现，改进的Stover-Kincannon基质去除模型（R2=0.983 3）和Grau二级动力学模型（R2=0.992 8）适合预测Anammox的脱氮性能和基质去除效率，而Monod模型拟合的R2仅为0.820 6，不适合描述不同HRT下UASB-Anammox的脱氮性能。
Abstract:
In an upflow anaerobic sludge bed (UASB) reactor seeded with A2/O return sludge from a municipal sewage treatment plant, Anammox was rapidly started by gradually increasing influent substrate concentration and shortening hydraulic residence time (HRT). The nitrogen removal performance of the reactor and the difference of microbial community structure before and after start-up were analyzed. It took only 40 days to start the reactor successfully. The removal rates of ammonia nitrogen and nitrite nitrogen remained above 90%, the maximum total nitrogen removal load was 0.99 kg/(m3·d), and the ratio of ΔNH4+-N, ΔNO2--N and ΔNO3--N was 1∶1.28∶0.26. During the start-up process, the contribution of denitrification to the removal of total nitrogen gradually decreased from 83% to 12%, and the cell yield of Anammox bacteria reached (1.37-13.75)×1010 cells/d at the end of the activity retardation period. At the start-up initial stage, the main Anammox bacteria were Candidatus Brocadia (25.14%) and Candidats Jettenia (2.92%). During the long-term operation, the abundance of Candidats Jettenia gradually increased to 12.67% and became the dominant bacteria. The modified Stover-Kincannon substrate removal model (R2 of 0.983 3) and Grau second-order kinetic model (R2 of 0.992 8) were suitable for predicting the nitrogen removal performance and substrate removal efficiency of Anammox reactor, while the R2 fitted by Monod model was only 0.820 6, indicating that it was not suitable to describe the nitrogen removal performance of UASB-Anammox reactor under different HRTs.

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更新日期/Last Update: 2023-05-01