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Effects of salinity and betaine addition on anaerobic granular sludge properties and microbial community succession patterns in organic saline wastewater.
Zhang, Zhifei; Wan, Jinquan; Ye, Gang; Wang, Yan; Bai, Yuwei; Yan, Zhicheng.
Afiliación
  • Zhang Z; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Wan J; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China. Electronic address: ppjqwan@scut.edu.cn.
  • Ye G; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Wang Y; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
  • Bai Y; Shijiazhuang High Tech Industrial Development Zone Water Supply and Drainage Company, Shijiazhuang 050000, China.
  • Yan Z; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
J Environ Sci (China) ; 147: 310-321, 2025 Jan.
Article en En | MEDLINE | ID: mdl-39003049
ABSTRACT
In this study, the effects of different salinity gradients and addition of compatible solutes on anaerobic treated effluent water qualities, sludge characteristics and microbial communities 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 (extracellular polymeric substances) in the granular sludge gradually increased with increasing salinity and the addition of betaine (a typical compatible solute). Meanwhile, the microbial community structure was significantly affected by salinity, with high salinity reducing the diversity of bacteria. At higher salinity, Patescibacteria and Proteobacteria gradually became 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 exogenous 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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Betaína / Eliminación de Residuos Líquidos / Salinidad / Aguas Residuales Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2025 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Betaína / Eliminación de Residuos Líquidos / Salinidad / Aguas Residuales Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2025 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos