Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, USA.
Environ Sci Technol. 2011 Jun 15;45(12):5079-87. doi: 10.1021/es2001612. Epub 2011 May 24.
Bank filtration induces flow of surface water through a hydraulically connected aquifer by excess pumping from a production well in the aquifer. This review presents the four main geochemical processes relevant for inorganic geochemistry, with a focus on iron (Fe) and manganese (Mn), during bank filtration: reduction near the bank, oxidation near the production well, carbonate dissolution, and sorption to aquifer materials. Physical and transport processes affect these geochemical processes and influence the redox state of the infiltrate. The presence of Fe and Mn in bank infiltrate is directly related to its redox status and can necessitate drinking water treatment after extraction. Long-term, in situ sequestration of Fe and Mn requires precipitation of oxide or carbonate solids, since a sorption front can breakthrough at the production well.
当含水层中的生产井过度抽取时，含水层中的地表水会通过水力连通流入地下，从而产生了滨岸过滤。本综述介绍了与无机地球化学相关的四个主要地球化学过程，重点是铁 (Fe) 和锰 (Mn)：滨岸附近的还原作用、生产井附近的氧化作用、碳酸盐溶解作用以及对含水层物质的吸附作用。物理和输运过程会影响这些地球化学过程，并影响浸滤物的氧化还原状态。滨岸渗滤物中 Fe 和 Mn 的存在与其氧化还原状态直接相关，在提取后可能需要进行饮用水处理。Fe 和 Mn 的长期原位固定需要氧化物或碳酸盐固体的沉淀，因为吸附前沿可能会在生产井中突破。
