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Membrane Bioreactors for wastewater reuse: Respirometric assessment of biomass activity during a two year survey

机译:膜生物反应器用于废水回用:在为期两年的调查中对生物量活动进行呼吸测定

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Stricter effluent limits, water shortage conditions, land availability requires today even more the needs of advanced wastewater treatments. Attractive solutions come from membrane bioreactors (MBR), Integrated Fixed Film Activated Sludge (IFAS) or combinations (i.e., IFAS-MBRs). One crucial aspect for the applicability of this overall new technology, compared to the conventional activated sludge systems, is the lack of knowledge for design and manage (e.g., kinetic constants, optimal operative conditions etc.). In view of the above frame, the aim of the present study was to assess the kinetic and stoichiometric parameters of bacterial species in MBRs by means of respirometric techniques. Plant configurations, operational conditions and wastewater features (domestic/industrial) were analysed. Four different MBR plants were investigated: i) sequencing batch MBR subjected to a gradual salinity increase: ii) pre-denitrification MBR treating saline wastewater contaminated by hydrocarbons; iii) University of Cape Town (UCT) MBR treating domestic wastewater subjected to a carbon-to-nitrogen (C/N) ratio variation; iiii) UCT- IFAS -MBR treating domestic wastewater. Results show a significant influence on biomass respiratory activity from both plant configurations and operational conditions. The salinity increase severely affected the activity of autotrophic species, while heterotrophic community was mainly influenced by the C/N variation. Moreover, it was observed a specialization in the IFAS-MBR configuration, with the suspended biomass more affine to organic matter, whilst biofilm in the nitrification process. The respirometric analysis confirmed to be an effective tool for the evaluation of the biomass kinetic and stoichiometric parameters. The results of this study can be useful for the application of mathematical models in the design phase and for the monitoring of biomass viability during plant operations. (C) 2018 Elsevier Ltd. All rights reserved.
机译:严格的废水排放限制,缺水条件,土地可利用性今天对高级废水处理的需求甚至更高。有吸引力的解决方案来自膜生物反应器(MBR),集成固定膜活性污泥(IFAS)或组合(即IFAS-MBR)。与常规活性污泥系统相比,这种整体新技术的适用性的一个关键方面是缺乏设计和管理方面的知识(例如,动力学常数,最佳操作条件等)。鉴于上述框架,本研究的目的是通过呼吸测定技术评估MBR中细菌物种的动力学和化学计量参数。分析了工厂配置,运行条件​​和废水特性(家庭/工业)。对四种不同的MBR工厂进行了研究:i)对逐步增加盐度的MBR进行测序:ii)预脱氮MBR处理被碳氢化合物污染的盐水; iii)开普敦大学(UCT)MBR处理生活污水,其碳氮比(C / N)发生变化; iiii)UCT- IFAS -MBR处理生活污水。结果表明,植物结构和操作条件均对生物量呼吸活动产生重大影响。盐度的增加严重影响了自养物种的活性,而异养群落主要受C / N变化的影响。此外,还观察到IFAS-MBR配置的专业化,其中悬浮的生物质更亲和有机物,而生物膜则处于硝化过程中。呼吸测定分析被证实是评估生物质动力学和化学计量参数的有效工具。这项研究的结果对于在设计阶段应用数学模型以及在工厂运营期间监控生物质生存能力可能是有用的。 (C)2018 Elsevier Ltd.保留所有权利。

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