Resistance and adaptation of mature algal-bacterial granular sludge under salinity stress

Zhe Liu; Dan Zhang; Fangzhi Ning; Shumin Zhang; Yiwen Hou; Min Gao; Jiaxuan Wang; Aining Zhang; Yongjun Liu

doi:10.1016/j.scitotenv.2022.160558

Resistance and adaptation of mature algal-bacterial granular sludge under salinity stress

Sci Total Environ. 2023 Feb 25:861:160558. doi: 10.1016/j.scitotenv.2022.160558. Epub 2022 Nov 28.

Authors

Zhe Liu¹, Dan Zhang², Fangzhi Ning², Shumin Zhang², Yiwen Hou², Min Gao³, Jiaxuan Wang⁴, Aining Zhang², Yongjun Liu⁵

Affiliations

¹ School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road, No. 13, Xi'an 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China; Yulin Ecological Environment Monitoring Station, High-tech Zone Xingda Road, Yulin 719000, China. Electronic address: zheliu@xauat.edu.cn.
² School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road, No. 13, Xi'an 710055, China.
³ School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Jin Hua Nan Road, No. 19, Xi'an 710048, China.
⁴ School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Yan Ta Road, No. 58, Xi'an 11 710054, China.
⁵ School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Yan Ta Road, No. 13, Xi'an 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China.

PMID: 36574543
DOI: 10.1016/j.scitotenv.2022.160558

Abstract

The study investigated the response characteristics of algal-bacterial granular sludge (ABGS) under salinity stress (0 % → 2 %). At 1 % salinity, the sludge performance was inhibited, while recovered rapidly, indicating the ABGS exhibited resistance. However, at 2 % salinity, the suppressed performances did not recover until the stress was eliminated. Under salinity stress, the nutrient removal capacity of the system and the composition and chemical characteristics of extracellular polymers substances also changed. Meanwhile, the ABGS formed adaptation to salinity stress in the early coping process. As a result, the effect of the second 2 % salinity on ABGS was significantly weakened. High-throughput sequencing results showed that the microbial community in ABGS shifted under salinity stress, and the halophilic bacteria genera Arcobacter, Denitromonas, Azoarcus, etc. were enriched, which might be the genetic basis of the adaptation.

Keywords: Adaptation; Algal-bacterial granular sludge; Microbial community structure; Resistance; Salinity stress.

MeSH terms

Bacteria
Bioreactors / microbiology
Microbiota*
Salinity
Salt Stress
Sewage* / microbiology
Waste Disposal, Fluid / methods

Substances

Sewage