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再生水地下储存系统微纳米曝气过程解析及其对溶解性有机物迁移归趋的影响

批准号51678121 学科分类污水处理与资源化 ( E080402 )
项目负责人范伟 负责人职称讲师 依托单位东北师范大学
资助金额64.00
万元
项目类别面上项目 研究期限2017 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词再生水;地下储存;微纳米气泡;溶解性有机物;迁移归宿
英文主题词reclaimed water;aquifer storage and recovery;micro-nano bubble;dissolved organic matter;fate and transport

摘要

中文摘要 残余溶解性有机物在地下缺氧环境中难衰减是制约再生水地下储存水质安全的关键,已有研究多聚焦于土壤含水层系统有限的天然净化过程,其原位衰减效能的强化研究相对不足。本项目首次引入新兴微纳米曝气技术,旨在建立基于微气泡迁移-氧化特性的再生水地下储存系统有机物长效深度处理方法。通过地表入渗池单一水相及地下储水区固液两相体系的模拟实验和理论模型,分析再生水水质特征对微纳米气泡产生特性的影响规律,揭示液相体系微纳米气泡对再生水的净化机理,进而从达西尺度、孔隙尺度及界面尺度对微纳米气泡随流迁移过程及其对溶解性有机物的影响进行监测分析,揭示其控制因子和影响规律,建立数学模型定量刻画对流弥散、多相吸附阻滞、自由基氧化等过程的耦合作用机制,并评估微纳米气泡在降低渗流效率及污染物易化迁移方面的潜在影响。项目成果将为解析微纳米曝气用于再生水地下储存的机制、优化工程方案以及评估该过程的环境风险奠定理论和实践基础。
英文摘要 In recent years, increased attention has being given to the subsurface storage and subsequent utilization of treated sewage effluent (reclaimed water) through aquifer storage and recovery (ASR) to meet growing demands for water particularly in seasonally arid regions. During ASR, water quality problems may arise when refractory dissolved organic matter (DOM) is introduced into the anoxic subsurface environment. Several studies have been performed to investigate the limited natural attenuation efficiency of soil-aquifer systems in specific sites or cases. However, research on in-situ enhanced attenuation is quite insufficient. To solve this problem, the micro-nano bubble (MNB) technology is introduced in this work to develop a long-effective method for the deep treatment, which is based upon the tiny bubbles’ mobility and oxidization characteristics. With the combination of experimental and theoretical analysis, the impact of reclaimed water quality on bubbles characteristics will be revealed, and the water purification mechainsm induced by MNBs will be elucidated in single liquid system. Then, columns experiments will be conducted to simulate the transport and fate of bubbles in saturated porous media (liquid-solid phases). At this point, the interactions between MNBs and DOM will be also examined and major impact factors will be identified through comparisons of batch experiments. Based upon these experimental data, numerical modelling that couples the multi-phase flow, attachment/deattchment and free radical oxidation will be built to quantify the evolution mechainsms of both MNBs and DOM during ASR. In addition, the feedbacks of application of MNBs to ASR project will be also evaluated by considering the hydraulic conductivity and the facilitated transport effect. Knowledge from this research will provide useful insights on the mechanism of MNB technology application to ASR system (especially the DOM purification ) and its environmental responses, which also support effective engineering design, operation & regulation and risk management in terms of theoretical analysis.
结题摘要

成果

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