Effects of salinity and betaine addition on anaerobic granular sludge properties and microbial community succession patterns in organic saline wastewater

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外文标题：Effects of salinity and betaine addition on anaerobic granular sludge properties and microbial community succession patterns in organic saline wastewater

外文摘要：In this study,the effects of different salinity gradients and addition of compatible solutes on anaerobic treated effluent water qualities,sludge characteristics and microbial communi-ties were investigated.The increase in salinity resulted in a decrease in particle size of the granular sludge,which was concentrated in the range of 0.5-1.0 mm.The content of EPS(ex-tracellular polymeric substances)in the granular sludge gradually increased with increasing salinity and the addition of betaine(a typical compatible solute).Meanwhile,the micro-bial community structure was significantly affected by salinity,with high salinity reducing the diversity of bacteria.At higher salinity,Patescibacteria and Proteobacteria gradually be-came the dominant phylum,with relative abundance increasing to 13.53％and 12.16％at 20 g/L salinity.Desulfobacterota and its subordinate Desulfovibrio,which secrete EPS in large quantities,dominated significantly after betaine addition.Their relative abundance reached 13.65％and 7.86％at phylum level and genus level.The effect of these changes on the treated effluent was shown as the average chemical oxygen demand(COD)removal rate decreased from 82.10％to 79.71％,78.01％,68.51％and 64.55％when the salinity gradually increased from 2 g/L to 6,10,16 and 20 g/L.At the salinity of 20 g/L,average COD removal increased to 71.65％by the addition of 2 mmol/L betaine.The gradient elevated salinity and the ex-ogenous addition of betaine played an important role in achieving stability of the anaerobic system in a highly saline environment,which provided a feasible strategy for anaerobic treatment of organic saline wastewater.

外文关键词：

Organic saline wastewaterAnaerobic granular sludgeCompatible soluteExtracellular polymeric substanceMicrobial community

作者：

Zhifei Zhang、Jinquan Wan、Gang Ye、Yan Wang、Yuwei Bai、Zhicheng Yan

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作者单位：

College of Environment and Energy,South China University of Technology,Guangzhou 510006,China

Shijiazhuang High Tech Industrial Development Zone Water Supply and Drainage Company,Shijiazhuang 050000,China

关键词：

Organic saline wastewater Anaerobic granular sludge Compatible solute Extracellular polymeric substance Microbial community

出版年：

2025

DOI：

10.1016/j.jes.2023.10.027

环境科学学报(英文版)

中科院生态环境研究中心

环境科学学报(英文版)

影响因子：0.862

ISSN：1001-0742

年,卷(期)：2025.147(1)