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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2024, Vol. 18 Issue (8) : 101    https://doi.org/10.1007/s11783-024-1861-y
Resistance to salt stresses by aerobic granular sludge: sludge property and microbial community
Xiao Wu1,5(), Hui Li2, Meili Wang3, Tianying Zhang1,5, Jiawei Li1,5, Yongdi Liu4()
1. Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
2. Institute for Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
3. School of Life Sciences, Southwest University, Chongqing 400715, China
4. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
5. Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu 610041, China
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Abstract

● Aerobic granular sludge could withstand long-term saline stresses.

● Aerobic granular sludge maintained strength under low-salinity condition.

● Aerobic granular sludge was dominated by halophiles at 50 g/L salinity.

Saline wastewater is regarded as a challenge for wastewater treatment plants because high-salinity conditions negatively affect on traditional biological technologies. Aerobic granular sludge (AGS) has gained attention as a promising technology for saline wastewater treatment because of its compact structure and the ability to withstand toxic loadings. Therefore, this study investigated the salt-resistance performance, sludge properties and microbial community of AGS under low-salinity and high-salinity conditions, with the saline concentrations ranging from 0 to 50 g/L. The results showed that AGS could withstand long-term saline stresses, and the maximum salinity reached 50 g/L within 113 d. Under salinities of 10, 30, and 50 g/L, the chemical oxygen demand (COD) removal efficiencies were 90.3%, 88.0% and 78.0%, respectively. AGS also its maintained strength and aggregation at salinities of 10 and 30 g/L. Overproduction of extracellular polymeric substances (EPS) by non-halophilic bacteria that enhanced sludge aggregation. The compact structure that ensured the microorganisms bioactivity helped to remove organic matters under salinities of 10 and 30 g/L. At a salinity of 50 g/L, moderately halophilic bacteria, including Salinicola, Thioclava, Idiomarina and Albirhodobacter, prevailed in the reactor. The dominant microbial communities shifted to moderately halophilic bacteria, which could maintain aerobic granular stabilization and remove organic matters under 50 g/L salinity. These results in this study provide a further explanation for the long-term operation of AGS for treating saline wastewater at different salinities. It is hoped that this work could bring some clues for the mystery of salt- resistance mechanisms.

Keywords Aerobic granular sludge      Long-term saline stresses      Performance      Sludge property      Microbial community     
Corresponding Author(s): Xiao Wu,Yongdi Liu   
Issue Date: 27 June 2024
 Cite this article:   
Xiao Wu,Hui Li,Meili Wang, et al. Resistance to salt stresses by aerobic granular sludge: sludge property and microbial community[J]. Front. Environ. Sci. Eng., 2024, 18(8): 101.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-024-1861-y
https://academic.hep.com.cn/fese/EN/Y2024/V18/I8/101
Operational stages Salt concentration in the influent (g/L)
I (1–18 d) 10
II (19–42 d) 30
III (43–113 d) 50
Tab.1  Operational stages of the reactor
Fig.1  Variation of COD removal (A), SOUR (B), and the correlationship (C) under saline stresses.
Fig.2  Settleability of aerobic granular sludge under saline stresses.
Fig.3  Morphology of AGS under different salinities: (A) 10 g/L, (B) 30 g/L, (C) 50 g/L.
Fig.4  IC (A) and RH (B) of AGS under different salinities.
Fig.5  EPS content of AGS under different salinities.
Samples Salinity (g/L) Peak A Peak B Peak C
Ex/Em Intensity Ex/Em Intensity Ex/Em Intensity
EPS of AGS 0 280/360 281 230/348 99 360/456 100
10 280/352 317 230/332 138 360/448 92
30 290/348 430 230/344 217 360/448 114
50 290/356 408 230/348 102 360/456 100
Tab.2  The EPS fluorescence spectral parameters of EPS with varying salinities
Fig.6  3D-EEM fluorescence spectra of EPS under different salinities: (A) 0 g/L, (B) 10 g/L, (C) 30 g/L, (D) 50 g/L.
Fig.7  Analysis of microbial community at genus level.
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