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

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Mengru Wang, Shuo Chen, Mengchun Gao, Yangguo Zhao, Junyuan Ji, Zhiming Zhang, Liang Zhu, Xiangyang Xu
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引用次数: 0

Abstract

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 < 0.01). Moreover, small granules exhibited smooth surface at ≤4% salinity. The efficient mass transfer area of granules was enlarged by the smooth surface, accelerating substrates mass transfer. Consequently, ammonia monooxygenase (AMO) activity was enhanced significantly (p < 0.05). Ammonia-oxidation bacteria, Nitrosomonas and nitrite-reduction bacteria, Paracoccus were dominated in small granules at 4% salinity, while loss at 6% salinity. Overall, small granules with smooth surface favored the enrichment of nitrogen removal microbes via substrate transfer enhancement, and improved the activity of AMO and NIR. Thus, the favorable nitrogen removal performance of aerobic granular sludge reactor was achieved at ≤4% salinity.

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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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