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首页> 外文期刊>RSC Advances >Assessing the performance and microbial structure of biofilms adhering on aerated membranes for domestic saline sewage treatment
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Assessing the performance and microbial structure of biofilms adhering on aerated membranes for domestic saline sewage treatment

机译：评估曝气膜上附着的生物膜用于生活污水处理的性能和微生物结构

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The presence of high salt concentration has always been considered as a common inhibitor that hampers effective municipal wastewater treatment. In this study, a bench-scale membrane-aerated biofilm reactor (MABR) was first introduced to degrade and remove the carbon and nitrogen pollutants under saline conditions. At influent concentrations of 220 mg CODCr per L and 32 mg NH4–N per L with an HRT of 24 h and salinity level of 3%, the reactor demonstrated excellent CODCr, NH4–N and TN removal efficiencies of 92.8%, 98.5% and 70.6%, respectively. Alphaproteobacteria, Anaerolineae, Gammaproteobacteria, Betaproteobacteria and Flavobacteria were the major functional classes in bacterial community. Candidatus Nitrososphaera exhibited stronger salt resistance compared with Nitrosomonas, and was probably the dominant nitrifier. Although the microbial diversity (Shannon–Wiener index) changed slightly along with the increasing salinity from 0.4% to 3%, the community composition substantially altered mainly through a fluctuant process via the growth of halophilic bacteria and the reduction of halotolerant bacteria. The halotolerant bacteria was mainly affiliated with Anaerolineae and Ignavibacteria while the halophilic bacteria mainly belonged to Alphaproteobacteria and Anaerolineae. The succession ensured a stable performance of the system under salty environments. This research suggests that MABR has the potential to effectively treat domestic saline sewage.
机译：高盐浓度的存在一直被认为是阻碍有效市政污水处理的常见抑制剂。在这项研究中，首先引入了台式规模的膜曝气生物膜反应器（MABR），以在盐水条件下降解和去除碳和氮污染物。当进水浓度为220毫克COD Cr / L和32毫克NH 4 –N时，采用HRT在24小时内，盐度为3％时，反应器显示出出色的COD Cr ，NH 4 –N和TN去除效率分别为92.8％，98.5％和70.6％。细菌群落中主要的功能类别是：丙酸杆菌，厌氧细菌，丙酸杆菌，贝氏杆菌和黄杆菌。念珠菌 Nitrososphaera 表现出比 Nitrosomonas 更强的耐盐性，并且可能是主要的硝化剂。尽管微生物多样性（香农-维纳指数）随着盐度从0.4％增至3％的变化而略有变化，但群落组成的变化主要是通过嗜盐菌生长和减少的波动过程引起的。耐盐细菌。耐盐细菌主要属于厌氧细菌和嗜细菌细菌，而嗜盐细菌主要属于丙酸杆菌和厌氧细菌。继承功能确保了系统在盐环境下的稳定性能。这项研究表明，MABR具有有效处理生活污水的潜力。

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