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首页> 外文学位 >Experimental and modeling studies on membrane-aerated granular activated carbon-sequencing batch biofilm reactors for wastewater treatment.
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Experimental and modeling studies on membrane-aerated granular activated carbon-sequencing batch biofilm reactors for wastewater treatment.

机译：膜曝气颗粒活性炭排序生物膜反应器用于废水处理的实验和模型研究。

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The Granular Activated Carbon-Sequencing Batch Biofilm Reactor (GAC-SBBR) is a novel unsteady-state periodic hybrid wastewater treatment system that combines operating advantages of the Sequencing Batch Reactor, membrane aeration, fixed-film biodegradation and GAC adsorption technologies. The reactor employs a gas-permeable silicone tubing pressurized with oxygen to support the biofilm and provide bubble-free oxygenation. This work sought to obtain an understanding of the operation of the various technologies employed in the GAC-SBBR with operating time and conditions and to identify potential interactions among them using a combination of fundamental experimental and modeling studies.; This objective was pursued in two phases. The first phase investigated the operation of the GAC bed in a series of experimental and modeling studies using toluene and F-300 activated carbon as a model solute/GAC system. The internal and external GAC structure characteristics were determined using several characterization techniques. Equilibrium studies were conducted to obtain the adsorption/desorption isotherms and to quantify the extent of irreversible adsorption. The toluene adsorption and desorption dynamics were determined experimentally under a wide range of operating conditions in batch and fixed-bed GAC adsorbers and were described successfully using a model which accounted for external mass transfer and intraparticle surface diffusion with a surface diffusion coefficient which increased with surface coverage.; The second phase addressed the development of a mathematical model for the GAC-SBBR process and its use for investigating the operation of the system with time and operating conditions. The model considered the various system components (membrane, biofilm, liquid bulk, GAC bed) and accounted for important transport and biological processes in them under dynamic conditions. Substrate biodegradation in the biofilm and the liquid bulk, permeation across the silicone membrane and GAC adsorption/desorption were considered. Oxygen diffusion in the membrane/biofilm system, biological consumption and adsorption/desorption were also accounted for. The model was verified using experimental results from previous bench-scale studies on the treatment of synthetic toluene wastewaters in SBBRs and was subsequently used to conduct an extensive operation analysis for the GAC-SBBR through model simulations.
机译：颗粒活性炭序列分批生物膜反应器（GAC-SBBR）是一种新型的非稳态周期性混合废水处理系统，结合了序列分批反应器的运行优势，膜曝气，固定膜生物降解和GAC吸附技术。该反应器采用可渗透氧气的硅胶管，以氧气加压以支撑生物膜并提供无气泡的充氧。这项工作旨在了解GAC-SBBR中采用的各种技术的运行以及运行时间和条件，并结合基础实验和模型研究来确定它们之间的潜在相互作用。该目标分两个阶段实现。第一阶段使用一系列甲苯和F-300活性炭作为溶质/ GAC系统模型，对GAC床的运行进行了一系列实验和建模研究。内部和外部GAC结构特征使用几种表征技术确定。进行了平衡研究，以获得吸附/解吸等温线并量化了不可逆吸附的程度。在批量和固定床GAC吸附器的广泛操作条件下，通过实验确定了甲苯的吸附和解吸动力学，并成功地使用了模型进行了描述，该模型考虑了外部传质和颗粒内表面扩散，且表面扩散系数随表面增加覆盖范围。第二阶段解决了GAC-SBBR流程数学模型的开发及其在调查时间和运行条件下系统运行情况方面的用途。该模型考虑了系统的各个组成部分（膜，生物膜，液体体积，GAC床），并说明了在动态条件下其中的重要运输和生物过程。考虑了生物膜和液体体积中的底物生物降解，有机硅膜上的渗透以及GAC吸附/解吸。膜/生物膜系统中的氧气扩散，生物消耗和吸附/解吸也被考虑在内。该模型已使用之前在SBBRs中处理合成甲苯废水的台式研究的实验结果进行了验证，随后通过模型仿真将其用于GAC-SBBR的广泛运行分析。

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