Combination of aquifer thermal energy storage and enhanced bioremediation: Biological and chemical clogging
Combination of aquifer thermal energy storage and enhanced bioremediation: Biological and chemical clogging
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含水层热能储存与强化生物修复相结合：生物和化学堵塞
DOI：
10.1016/j.scitotenv.2017.09.087
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发表时间：
2018
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;Pauline van Gaans;Huub Rijnaarts;Tim Grotenhuis
由于城市地区对可再生能源技术和可持续地下水管理的需求，最近对含水层热能储存（ATES）和加强生物修复的组合概念的兴趣有所增加。然而，加强生物修复对ATES的影响尚不清楚。主要关注的是生物堵塞的可能性，这可能会增强并阻碍ATES的正常功能。另一方面，通过增强生物修复在地下的更多还原条件可能会降低化学堵塞的机会，这通常是由Fe（III）沉淀物引起的。为了研究可能的影响，增强生物修复堵塞与ATES，我们进行了两个循环柱实验，不同的流速（10和50 mL/min），其中增强的生物活性和化学促进的Fe（III）沉淀分别研究了通过添加乳酸盐和硝酸盐。柱的流入侧和流出侧之间的压降用作水力传导率（变化）的量度，作为这些模型ATES系统中堵塞的指示。结果表明，在两种流速下，在增强的生物活性期间（添加乳酸盐后）上游压力没有增加，而添加硝酸盐导致压降显著增加。然而，在流速为10 mL/min时，添加乳酸盐可缓解添加硝酸盐引起的高压累积。这表明，生物堵塞的风险是相对较小的模仿ATES系统，结合了增强的生物修复与乳酸盐作为底物的调查领域，此外，乳酸盐可以对抗化学堵塞。
Interest in the combination concept of aquifer thermal energy storage (ATES) and enhanced bioremediation has recently risen due to the demand for both renewable energy technology and sustainable groundwater management in urban areas. However, the impact of enhanced bioremediation on ATES is not yet clear. Of main concern is the potential for biological clogging which might be enhanced and hamper the proper functioning of ATES. On the other hand, more reduced conditions in the subsurface by enhanced bioremediation might lower the chance of chemical clogging, which is normally caused by Fe(III) precipitate. To investigate the possible effects of enhanced bioremediation on clogging with ATES, we conducted two recirculating column experiments with differing flow rates (10 and 50 mL/min), where enhanced biological activity and chemically promoted Fe(III) precipitation were studied by addition of lactate and nitrate respectively. The pressure drop between the influent and effluent side of the column was used as a measure of the (change in) hydraulic conductivity, as indication of clogging in these model ATES systems. The results showed no increase in upstream pressure during the period of enhanced biological activity (after lactate addition) under both flow rates, while the addition of nitrate lead to significant buildup of the pressure drop. However, at the flow rate of 10 mL/min, high pressure buildup caused by nitrate addition could be alleviated by lactate addition. This indicates that the risk of biological clogging is relatively small in the investigated areas of the mimicked ATES system that combines enhanced bioremediation with lactate as substrate, and furthermore that lactate may counter chemical clogging.