Low-temperature Aquifer Thermal Energy Storage combined with in situ bioremediation of chlorinated ethenes: Pilot-scale observations and model-based interpretation

IF 3.5 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Henning Wienkenjohann , Klaus Mosthaf , Line Mørkebjerg Fischer , Lars Bennedsen , John Flyvbjerg , Mette Christophersen , Massimo Rolle
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引用次数: 0

Abstract

Microbial reductive dechlorination is a key process in aquifers contaminated with chlorinated ethenes and results in a net mass reduction of organic pollutants. Biodegradation rates in the subsurface are temperature-dependent and may be enhanced by increased groundwater temperatures. This study explores the potential of combining the temperature increase from low-temperature Aquifer Thermal Energy Storage with In Situ Bioremediation (ATES-ISB). The effects of highly dynamic groundwater flow and heat transport on microbial degradation rates were examined in a contaminated aquifer based on a pilot-scale experiment and a comprehensive process-based modeling analysis. The low-temperature ATES-ISB pilot test was carried out in Birkerød (Denmark), in an aquifer contaminated with trichloroethene by implementing a groundwater flow dipole, injecting heated groundwater, biostimulating the system with lactate and bioaugmenting it with a Dehalococcoides containing culture. Solute concentrations were monitored in four observation wells over the course of the test and a non-isothermal reactive transport model, solved in a two-dimensional heterogeneous domain, was developed to quantitatively interpret the experimental observations. The process-based numerical model also allowed evaluating the evolution of chlorinated ethenes concentrations considering different hydraulic, thermal, and operational scenarios. The results demonstrate the beneficial combination of ATES with in situ contaminant bioremediation, showing enhancement of contaminant mass reduction and more complete reductive dechlorination. The developed process-based model can be instrumental for the design and parameterization of pilot and full scale low-temperature ATES-ISB remediation in shallow aquifer systems.

低温含水层热能储存与氯化醚原位生物修复相结合:试点规模观测和基于模型的解释
微生物还原脱氯是受氯化醚污染的含水层中的一个关键过程,可导致有机污染物的净质量减少。地下水的生物降解速率与温度有关,地下水温度升高可能会提高生物降解速率。本研究探讨了将低温含水层热能储存的温度升高与原位生物修复(ATES-ISB)相结合的可能性。基于中试规模实验和基于过程的综合建模分析,研究了受污染含水层中高动态地下水流和热量传输对微生物降解率的影响。低温 ATES-ISB 试验是在比尔克罗德(丹麦)受三氯乙烯污染的含水层中进行的,具体方法是实施地下水流偶极子、注入加热的地下水、用乳酸盐对系统进行生物刺激,并用含有 Dehalococcoides 的培养物对其进行生物评估。在试验过程中,对四个观察井中的溶质浓度进行了监测,并开发了一个在二维异质域中求解的非等温反应迁移模型,用于定量解释试验观测结果。基于过程的数值模型还可以评估不同水力、热力和运行情况下氯化乙烯浓度的变化。结果表明,将 ATES 与原位污染物生物修复技术相结合是有益的,可以提高污染物的减少量,并实现更彻底的还原脱氯。所开发的基于过程的模型有助于浅含水层系统中试验性和全面性低温 ATES-ISB 修复的设计和参数化。
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来源期刊
Journal of contaminant hydrology
Journal of contaminant hydrology 环境科学-地球科学综合
CiteScore
6.80
自引率
2.80%
发文量
129
审稿时长
68 days
期刊介绍: The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.
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