Improving anammox performance by limited filamentous bulking for wastewater treatment with organic stress

Ziqing Wei; Dong Li; Shuai Li; Tongyao Hao; Huiping Zeng; Jie Zhang

doi:10.1016/j.biortech.2022.128506

Improving anammox performance by limited filamentous bulking for wastewater treatment with organic stress

Bioresour Technol. 2023 Feb:369:128506. doi: 10.1016/j.biortech.2022.128506. Epub 2022 Dec 16.

Authors

Ziqing Wei¹, Dong Li², Shuai Li¹, Tongyao Hao¹, Huiping Zeng¹, Jie Zhang³

Affiliations

¹ Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
² Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: lidong2006@bjut.edu.cn.
³ Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.

PMID: 36535612
DOI: 10.1016/j.biortech.2022.128506

Abstract

In this study, the filamentous bulking was demonstrated to improve anammox capability and anammox bacteria (AnAOB) population density under organic stress. The selective heterotrophic bacteria (HB) washout that involved in shear detachment, enmeshment and biomass washout was triggered. The microbial spatial distribution and granular detachment properties revealed that the filamentous bulking transferred the "location advantage" of HB from granules interior to surface, and endowed granular surface low shear tolerance for shear detachment, ultimately resulted in selective HB detachment. The detached filaments-mediated enmeshment provided additional selective pressure for free HB-flocs, eventually achieving the retention time differentiation between AnAOB (34 - 141 days) and HB (3 - 15 days), and a high anammox population density. Controlling dissolved oxygen level was crucial for regulating sludge bulking. Collectively, the filamentous bulking was developed as an effective anti-organic stress strategy to broaden the application of granular anammox process in actual wastewater treatment.

Keywords: Enmeshment; Selective biomass washout; Shear detachment; Sludge disintegration; Sludge retention time.

MeSH terms

Anaerobic Ammonia Oxidation
Bacteria
Bioreactors / microbiology
Nitrogen
Oxidation-Reduction
Sewage / microbiology
Waste Disposal, Fluid* / methods
Water Purification*

Substances

Sewage
Nitrogen