氯化乙烯原位微生物修复结合含水层储能系统中的生物地球化学行为

Chlorinated ethenes (CVOCs) have been extensively used in the industrial sectors, especially in the dry-cleaning industry, leading to contamination of groundwater and risk of human health. As a cost-effective remediation technique, in-situ bioremediation (ISB) has been widely investigated and applied throughout the world for CVOCs remediation. However, the property of long duration of ISB might limit its further development and re-use of the contaminated land. To overcome this drawback, innovation or combination with other technology in a broader urban developing framework is needed. The combination of ISB and the novel sustainable energy technology -aquifer thermal energy storage (ATES)- could be a promising approach which might deal with environmental and energy problem simultaneously. Preliminary research has shown that the compatibility of these two is relatively high and ATES seems to have positive effects on ISB. By conducting series of batch and column experiments that highly mimic ATES-ISB system, and applying analytical chemistry, molecular microbiology and environmental microbiology techniques, this project focuses on investigate the related important biogeochemical processes in the combined system. We aim to clarify how ATES affects CVOCs bioremediation through by periodically changing temperature and highly enhancing groundwater movement; reveal how microorganisms behave under ATES condition; and determine the influence of microbial activities on ATES functioning. The outcome of this study is meaningful for the development of ATES-ISB technology and is expected to provide useful theoretical and practical guidelines.

城市含水土层中氯化乙烯污染是普遍而严峻的环境问题，修复该污染的原位微生物修复技术ISB是国内外研究热点。然而ISB普遍周期长，效率亟需提高。基于同时解决环境与能源问题理念所提出的“ISB与清洁能源含水层储能系统（ATES）的结合技术”，是目前国际上备受关注的研究前沿。作为新型技术，相关的研究目前仍处于初期阶段，结合技术背后涉及的复杂生物地球化学行为尚未得到深入解释。本项目以探索结合体系间的相互影响为目的，拟开展高度模拟结合系统的土柱与批式机理性实验，探讨结合体系的局部与整体变化，并联合运用分析化学、分子生物学及环境微生物学技术，深究背后复杂的生物地球化学行为过程，阐明ATES（温度高低交替变化、地下水流极大增强）对氯化乙烯原位微生物修复的作用，明确相关厌氧微生物在此环境下的运动行为机理，并揭示微生物活动对ATES运行的潜在影响，以期为该结合技术的发展和未来成熟应用提供科学依据和技术支撑。