Rethinking the effect of salinity on nitrogen removal capacity of aerobic granular sludge from the perspective of size distribution and granular morphology

Granular size induces the operation performance variation of aerobic granular sludge reactor, but the profound reasons are unrevealed. This study investigated the influence of granular size distribution on the reactor operation under salt stress. The effective nitrogen removal was achieved at ≤4% sa...

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Bibliographic Details
Published in:Environmental research 2025-02, Vol.266, p.120580, Article 120580
Main Authors: Wang, Mengru, Chen, Shuo, Gao, Mengchun, Zhao, Yangguo, Ji, Junyuan, Zhang, Zhiming, Zhu, Liang, Xu, Xiangyang
Format: Article
Language:English
Subjects:
Aerobic granular sludge
Aerobiosis
ammonia monooxygenase
Bioreactors - microbiology
Granular size
mass transfer
nitrite reductase
nitrogen
Nitrogen - metabolism
Nitrogen removal
Nitrosomonas
Particle Size
Salinity
Salt stress
Sewage - chemistry
Sewage - microbiology
sludge
Surface morphology
Waste Disposal, Fluid - methods
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Summary:Granular size induces the operation performance variation of aerobic granular sludge reactor, but the profound reasons are unrevealed. This study investigated the influence of granular size distribution on the reactor operation under salt stress. The effective nitrogen removal was achieved at ≤4% salinity, but declined at 6% salinity. The phenomenon was determined by the granular size fraction. The small granules (d = 200–600 μm) fraction was 77%–81% at ≤4% salinity, while only 57.32% at 6% salinity. That was positively correlated with nitrite reductase (NIR) activity significantly (p 
ISSN:0013-9351
1096-0953
1096-0953
DOI:10.1016/j.envres.2024.120580