Establishing and maintaining stable anammox pathway for nitrogen removal in a pure floc sludge A2/O reactor treating low COD/N municipal wastewater

被引：0

作者：

Zhao, Yang ^{[1
]}

Zhang, Liang ^{[1
]}

Liu, Qiyu ^{[1
]}

Liu, Xiaoguang ^{[1
]}

Zhao, Qi ^{[1
]}

Li, Xiyao ^{[1
]}

Peng, Yongzhen ^{[1
]}

机构：

[1] Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment &, Beijing 100124, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2025年 / 504卷

基金：

中国国家自然科学基金;

关键词：

Anammox; Floc sludge; Partial denitrification; Continuous-flow; Biological nitrogen removal; Municipal wastewater; ANAEROBIC AMMONIUM OXIDATION; PARTIAL DENITRIFICATION; MICROBIAL COMMUNITY; RECLAMATION PLANT; PERFORMANCE; TECHNOLOGY; SEWAGE;

D O I：

10.1016/j.cej.2024.159072

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Most municipal wastewater treatment plants worldwide rely on the traditional activated sludge process for nutrient removal and recovery. However, current research and applications of mainstream anammox primarily utilize biofilms or granular sludge as media, which inevitably increases capital costs and operational complexity. This study, for the first time, demonstrates the long-term stability of partial denitrification/anammox (PD/A) in a pure floc sludge system treating real municipal wastewater (COD/N: 2.3-3.3) employing the widely-applied anaerobic-anoxic-oxic (A(2)/O) process. It reveals the crucial role of extended sludge retention time (> 150 days) and low COD/N (2.7-3.0) in achieving efficient nitrogen removal. Anammox bacteria rapidly accumulated in the floc sludge via natural shedding from the PD/A biofilms and continued to proliferate after the system shifted to a pure floc sludge configuration, ultimately reaching 2.16 x 10(9) copies/g SS. The pure floc system sustained stable PD/A for 280 days, with anammox contributing 31.7-45.3 % of nitrogen removal. The system achieved a nitrogen removal efficiency of 79.2 +/- 3.8 %, with an effluent concentration of 9.8 +/- 1.7 mg-N/L. This study highlights the potential of pure floc sludge systems for mainstream anammox implementation, presenting a simpler, more cost-effective alternative to biofilms and granular sludge systems.

引用

页数：11

共 49 条

[1] Mulder A., Van de Graaf A.A., Robertson L., Kuenen J., Anaerobic ammonium oxidation discovered in a denitrifying fluidized bed reactor, FEMS Microbiol. Ecol., 16, 3, pp. 177-183, (1995)
[2] Kartal B., Kuenen J.V., Van Loosdrecht M., Sewage treatment with anammox, Science, 328, 5979, pp. 702-703, (2010)
[3] Lackner S., Gilbert E.M., Vlaeminck S.E., Joss A., Horn H., van Loosdrecht M.C.M., Full-scale partial nitritation/anammox experiences - an application survey, Water Res., 55, pp. 292-303, (2014)
[4] Zhao Q., Zhang L., Li J.W., Jia T.P., Deng L.Y., Liu Q.Y., Sui J., Zhang Q., Peng Y.Z., Carbon-restricted anoxic zone as an overlooked anammox hotspot in municipal wastewater treatment plants, Environ. Sci. Technol., 57, 51, pp. 21767-21778, (2023)
[5] Li J., Peng Y., Zhang L., Liu J., Wang X., Gao R., Pang L., Zhou Y., Quantify the contribution of anammox for enhanced nitrogen removal through metagenomic analysis and mass balance in an anoxic moving bed biofilm reactor, Water Res., 160, pp. 178-187, (2019)
[6] Li J., Peng Y., Zhang Q., Li X., Yang S., Li S., Zhang L., Rapid enrichment of anammox bacteria linked to floc aggregates in a single-stage partial nitritation-anammox process: Providing the initial carrier and anaerobic microenvironment, Water Res., 191, (2021)
[7] Zhao Q., Chen K., Li J., Sun S., Jia T., Huang Y., Peng Y., Zhang L., Pilot-scale evaluation of partial denitrification/anammox on nitrogen removal from low COD/N real sewage based on a modified process, Bioresour. Technol., 338, (2021)
[8] Zhao Y., Li J., Liu Q., Qi Z., Li X., Zhang Q., Sui J., Wang C., Peng Y., Fast start-up and stable operation of mainstream anammox without inoculation in an A(2)/O process treating low COD/N real municipal wastewater, Water Res., 231, (2023)
[9] Alia F., Salimb C., Lestaric D.L., Azmic K.N., Challenges of moving bed biofilm reactor and integrated fixed-film activated sludge implementation for wastewater treatment in Indonesia, Chem. Eng., 83, (2021)
[10] Leyva-Diaz J.C., Monteoliva-Garcia A., Martin-Pascual J., Munio M.M., Garcia-Mesa J.J., Poyatos J.M., Moving bed biofilm reactor as an alternative wastewater treatment process for nutrient removal and recovery in the circular economy model, Bioresour. Technol., 299, (2020)

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