Potential impact of hydrodynamic shear force in aquifer thermal energy storage on dissolved organic matter releasement: A vigorous shaking batch study
Potential impact of hydrodynamic shear force in aquifer thermal energy storage on dissolved organic matter releasement: A vigorous shaking batch study
复制标题
含水层热能储存中水动力剪切力对溶解有机物释放的潜在影响：剧烈摇动批量研究
DOI：
10.1016/j.scitotenv.2019.04.314
复制
发表时间：
2019
影响因子：
9.8
通讯作者：
Tim Grotenhuis
中科院分区：
文献类型：
--
作者：
Zhuobiao Ni;Xiao Li;Yafei Wang;Yue Wang;Rongliang Qiu;Huub Rijnaarts;Tim Grotenhuis
生物修复与含水层储热技术的结合因其同时解决环境和能源问题的可能性而变得具有吸引力。文献对温度变化引起的ATES对地下水质量的影响已经得到了充分的关注，而地下水流速的大幅提高对地下水质量的影响还没有得到足够的科学关注。为了填补这一认识上的空白，我们进行了一个简单而直接的实验，以说明由ATES水流引起的流体动力剪切力对溶解有机物释放的影响，这可能有利于生物修复。采用强震动条件模拟ATES井中心及附近的增强动力学。作为溶解有机质的指标，COD和TOC浓度受震动影响显著。水平震动时COD由5.4 mgO2/L增加到36.3 mgO2/L。摇轨期间COD最大值为33.8 mgO2/L， TOC值由6.7 mg C/L增加到28.7 mg C/L。同时，随着COD和TOC水平的升高，氧化还原电位（初始水平为-100 mV）同步降低至-450 mV。温度也是影响有机质释放的重要因素。微生物铁还原被认为发生，但硫酸盐还原在整个实验中没有启动。最终，由于广泛的水力和颗粒碰撞，土壤-水基质的结构发生了变化，导致其外观变黑，细颗粒层变厚。总的来说，这些发现促进了我们对ATES诱导的水流在地下生物地球化学中的作用的理解，并为生物修复和ATES结合的前景提供了新的视角。一般来说，由于ATES系统在高流量条件下剪切力的增加，溶解有机物的增加是可以预期的。
The combination of bioremediation and aquifer thermal energy storage (ATES) has become attractive because of the possibility of solving environmental and energy problems simultaneously. While the impact of ATES on groundwater quality due to temperature change has received ample attention in literature, the effect of the greatly enhanced groundwater flow velocity on groundwater quality has not yet received sufficient scientific attention. To fill this gap in understanding, we conducted a simple yet straightforward experiment to illustrate the impact of hydrodynamic shear force due to the water flow by ATES on the release of dissolved organic matter, which can potentially be advantageous to bioremediation. Vigorous shaking conditions were applied to simulate the enhanced dynamics at the ATES well center and nearby. As the indicators of dissolved organic matter, COD and TOC concentrations were significantly impacted by shaking. COD increased from 5.4 mgO2/L to 36.3 mgO2/L during horizontal shaking. The maximum COD level was determined as 33.8 mgO2/L during orbital shaking, while the TOC level was growing from 6.7 to 28.7 mg C/L. Meanwhile, redox potential (with initial level -100 mV) was decreasing to -450 mV synchronously with the elevating COD and TOC level. Temperature was also revealed as a significant factor in the organic matter releasement. Microbial iron reduction was deemed to occur, yet sulfate reduction was not initiated during the whole experiment. Eventually, the structure of the soil-water matrix has been changed due to the extensive hydraulic and particle collisions, resulting in blackish appearance and thicker layer of fine particles. Overall, the findings advance our understanding of the role of the ATES-induced water flow in the subsurface biogeochemistry and give insight into the perspective of the combination of bioremediation and ATES. In general, an increase in dissolved organic matter can be expected due to the increased shear force at high flow conditions in the ATES system.