Journal
WATER
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/w10101460
Keywords
decentralized aquifer recharge; treated wastewater infiltration; precipitation infiltration; numerical modeling
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Funding
- Saxon Development Bank [100301390]
- European Social Fonds of the European Union
- German Research Foundation [LI 727/24-1]
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Decentralized water management requires innovative technical solutions due to restricted operational and economic resources. In this study, a combined, decentralized infiltration system in the form of closely-spaced sub-systems for precipitation water and treated wastewater has been numerically analyzed. Flow and transport simulation shows that a closely-spaced system, by arranging the infiltration pipes closely in a longitudinal manner, is feasible under the consideration of German national guidelines for both infiltration methods. Precipitation events up to a recurrence interval of five years can be infiltrated alongside with treated wastewater of a one-family house without significant reduction of the wastewaters' residence time. Scenario analyses highlight that harmless wastewater infiltration remains mainly undisturbed for a broad bandwidth of hydrological, subsurface, and technical conditions.
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