Resistance to salt stresses by aerobic granular sludge: sludge property and microbial community

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Xiao Wu, Hui Li, Meili Wang, Tianying Zhang, Jiawei Li, Yongdi Liu
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Abstract

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.

Abstract Image

好氧颗粒污泥对盐胁迫的抵抗力:污泥特性和微生物群落
含盐废水被认为是废水处理厂面临的一项挑战,因为高盐度条件会对传统的生物技术产生负面影响。好氧颗粒污泥(AGS)因其结构紧凑且能承受有毒负荷,作为一种有前途的盐碱废水处理技术而备受关注。因此,本研究考察了 AGS 在低盐度和高盐度条件下的耐盐性能、污泥性质和微生物群落,盐浓度范围为 0 至 50 g/L。结果表明,AGS 可以承受长期的盐胁迫,在 113 d 内最大盐度达到 50 g/L。在 10、30 和 50 g/L 的盐度条件下,化学需氧量(COD)去除率分别为 90.3%、88.0% 和 78.0%。在盐度为 10 和 30 克/升时,AGS 还能保持强度和聚集性。非嗜卤细菌过量产生的胞外聚合物物质(EPS)增强了污泥的聚集性。在盐度为 10 和 30 克/升时,确保微生物生物活性的紧凑结构有助于去除有机物。在盐度为 50 克/升时,反应器中普遍存在中度嗜卤细菌,包括 Salinicola、Thioclava、Idiomarina 和 Albirhodobacter。在盐度为 50 克/升的情况下,优势微生物群落转为中度嗜卤细菌,它们能维持好氧颗粒稳定并去除有机物。本研究的这些结果为 AGS 在不同盐度下处理含盐废水的长期运行提供了进一步的解释。希望这项工作能为揭开耐盐机制之谜提供一些线索。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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