地热促进生物反应器的耦合流动模型

Lucila B. Dunnington, M. Nakagawa
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引用次数: 0

摘要

世界各地的废弃矿井将受污染的水泄漏到宝贵的水资源中,威胁着人类和自然环境。工业对解决污染的主要需求是一种被动系统,利用当地可用的廉价材料,几乎没有能源或维护需求。被动处理系统可以在偏远地区运行,使用各种廉价的、当地可获得的材料,废物产生量低,但受环境条件的限制,往往占用大量空间。废弃矿山可利用的地热梯度是一种可行的热能来源,可以为已建立的修复技术,即生物修复提供有利的温度条件。目前,用于测试新被动设计的主要模型要么主要基于经验,要么限制了建模参数的范围,这使得很难将创新设计方面纳入现有的建模框架。本文提出了一个基于柱实验动力学参数的模型,该模型结合了力学、热力学、流体力学和微生物动力学。模拟结果显示了施加温度梯度对生物反应器的渗透性和微生物驱动反应的影响。该模型反映了多相系统中不断变化的传热传质过程。在生物反应器中添加地热能可以改善长期渗透性,增强反应和沉淀动力学,并减少设计的生物反应器系统所需的空间扩展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coupled Flow Modelling for a Geothermally Facilitated Bioreactor
Abandoned mines across the world leak contaminated waters into precious water resources, threatening human populations and natural environments alike. The primary demand from the industry for addressing the contamination is a passive system that utilizes locally available and cheap material, with little energy or maintenance requirement. Passive treatment systems can operate in remote regions, using diverse, inexpensive, and locally available material with low waste production, but are subject to ambient conditions and are often space intensive. The geothermal gradient available at abandoned mines is a viable heat energy source that can provide advantageous temperature conditions for established remediation techniques, namely bioremediation.Currently, the primary models used for testing new passive designs are either largely empirically based, or limit the scope of modelling parameters, making it difficult to incorporate innovative design aspects into the existing modelling framework. The following paper presents a model, based on kinetic parameters from a column experiment, which couples mechanics, thermodynamics, hydrodynamics, and microbial kinetics. The modelling results show the effect of an imposed temperature gradient on the permeability and microbially driven reactions of a bioreactor. The model reflects evolving thermal and mass transfer in the multiphase system. The addition of geothermal energy to a bioreactor is shown to improve long-term permeability, enhance reactions and precipitation kinetics, and decrease the necessary spatial expanse of designed bioreactor systems.
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