Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-GE Geological & Soil Environment

[A-GE31] Subsurface Mass Transport, Material Cycle, and Environmental Assessment

Mon. May 21, 2018 1:45 PM - 3:15 PM 104 (1F International Conference Hall, Makuhari Messe)

convener:Yuki Kojima(Department of Civil Engineering, Gifu University), Shoichiro Hamamoto(Department of Biological and Environmental Engineering, The University of Tokyo), Hirotaka Saito(東京農工大学大学院農学研究院, 共同), Yasushi Mori(Graduate School of Environmental and Life Science, Okayama University), Chairperson:Kojima Yuki(Gifu University), Saito Hirotaka(Tokyo University of Agriculture and Technology)

2:40 PM - 3:10 PM

[AGE31-04] Managed Aquifer Recharge for Water Reclamation, Recycling, and Reuse

★Invited Papers

*Scott Bradford1, Salini Sasidharan2, Jiří Šimůnek2, Saeed Torkzaban3 (1.USDA Salinity Laboratory, 2.University of California, Riverside, 3.Flinders University)

Managed Aquifer Recharge (MAR) operations have been designed to purposely inject or infiltrate rainwater, stormwater, reclaimed water, or water from other aquifers into a selected aquifer for storage, in situ treatment, and later recovery. Two challenges to successful MAR operation include clogging of the infiltration surface and the presence of microbial pathogens in recovered drinking water. This presentation summarizes ongoing field, laboratory, and numerical modeling experiments that were designed to better assess, understand, and overcome these MAR challenges. In particular, we have studied the pros and cons of various MAR operations, developed modeling tools to simulate infiltration from modern drywells and to inversely determine in situ soil hydraulic properties, and examined the influence of subsurface heterogeneity on drywell performance. Conditions that pose greater risks for clogging were identified, and approaches to mitigate clogging were investigated. Factors and mechanisms that alter the risk of pathogen transport during MAR were also systematically examined, including: field-scale variations in water velocity, solution and solid phase chemistry, residence time, and temperature. Optimization of these MAR conditions can be used to improve the microbial quality of recovered water and minimize the risks to human health.