Effects of Redox Condition on Bacteria-Mediated Hydrochemical Processes and Bacterial Community During Managed Aquifer Recharge

Mengjie Qin, Haichi You, Weijie Zhang, Longyun Liu, Jinhui Liu and Lu Xia ()
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Mengjie Qin: College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Haichi You: Engineering Geology Brigade, Jiangxi Bureau of Geology, Nanchang 330029, China
Weijie Zhang: College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Longyun Liu: College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jinhui Liu: College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Lu Xia: College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Sustainability, 2024, vol. 17, issue 1, 1-14

Abstract: During the process of managed aquifer recharge (MAR), when the aerobic surface water is recharged into the reductive aquifer, the redox environment changes along the water pathway. MAR practice can reshape the initial groundwater bacterial community, and further induce variations in the bacteria-mediated hydrochemical reactions. In this study, laboratory-scale column experiments were conducted to simulate the processes of aerobic/anaerobic recharge to aquifer. The results showed that the concentration of DO during the aerobic recharge was higher than that of the anaerobic recharge, and ORP showed a similar trend. Active nitrogen transformation was observed during the simulated MAR processes. In the early stages of both the aerobic and anaerobic recharges, nitrate reduction occurred due to denitrification and DNRA. However, in the late stages, nitrification might happen in the aerobic column, and nitrate reduction remained the major process in the anaerobic column. For the bacterial community, Massilia , Ralstonia , Legionella , and Curvibacter predominated under the aerobic recharge. Comparatively, Cedecea , Cupriavidus , and Ralstonia maintained high relative abundances under the anaerobic recharge. Our study provides essential information about the characteristics of bacterial-mediated hydrochemical reactions during the MAR process. The result would enhance understanding of MAR activities and provide valuable insights into the groundwater resources’ sustainable development and management.

Keywords: redox condition; nitrogen transformation; bacterial community composition; high-throughput sequencing; aquifer medium; groundwater resources sustainability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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