Aquifer recharge with stormwater runoff in urban areas: Influence of vadose zone thickness on nutrient and bacterial transfers from the surface of infiltration basins to groundwater

Stormwater infiltration systems (SIS) have been built in urban areas to reduce the environmental impacts of stormwater runoff. Infiltration basins allow the transfer of stormwater runoff to aquifers but their abilities to retain contaminants depend on vadose zone properties. This study assessed the...

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Veröffentlicht in:The Science of the total environment Jg. 637-638; S. 1496 - 1507
Hauptverfasser: Voisin, Jérémy, Cournoyer, Benoit, Vienney, Antonin, Mermillod-Blondin, Florian
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands Elsevier B.V 01.10.2018
Elsevier
Schlagworte:
16S rRNA
ammonium
aquifers
bacteria
Bacteria - growth & development
Bacterial communities
basins
biodegradability
Biodiversity and Ecology
community structure
Dissolved organic carbon
Dissolved oxygen
environmental impact
Environmental Monitoring
Environmental Sciences
field experimentation
genes
groundwater
Groundwater - chemistry
Groundwater - microbiology
high-throughput nucleotide sequencing
Next-generation sequencing
nitrates
Nitrogen - analysis
nutrients
organic carbon
phosphates
ribosomal RNA
stormwater
Stormwater infiltration systems
urban areas
vadose zone
Water Pollutants, Chemical - analysis
wet season
Dissolved organic carbon
16S rRNA
Next-generation sequencing
Bacterial communities
Dissolved oxygen
Stormwater infiltration systems
Bacterial communities Dissolved organic carbon Dissolved oxygen Stormwater infilltration systems Next-generation sequencing 16S rRNA
ISSN:0048-9697, 1879-1026, 1879-1026
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Zusammenfassung:Stormwater infiltration systems (SIS) have been built in urban areas to reduce the environmental impacts of stormwater runoff. Infiltration basins allow the transfer of stormwater runoff to aquifers but their abilities to retain contaminants depend on vadose zone properties. This study assessed the influence of vadose zone thickness (VZT) on the transfer of inorganic nutrients (PO43−, NO3−, NH4+), dissolved organic carbon (total -DOC- and biodegradable -BDOC-) and bacteria. A field experiment was conducted on three SIS with a thin vadose zone (<3 m) and three SIS with a thick vadose zone (>10 m). Water samples were collected at three times during a rainy period of 10 days in each infiltration basin (stormwater runoff), in the aquifer impacted by infiltration (impacted groundwater) and in the same aquifer but upstream of the infiltration area (non-impacted groundwater). Inorganic nutrients, organic matter, and dissolved oxygen (DO) were measured on all water samples. Bacterial community structures were investigated on water samples through a next-generation sequencing (NGS) scheme of 16S rRNA gene amplicons (V5-V6). The concentrations of DO and phosphate measured in SIS-impacted groundwaters were significantly influenced by VZT due to distinct biogeochemical processes occurring in the vadose zone. DOC and BDOC were efficiently retained in the vadose zone, regardless of its thickness. Bacterial transfers to the aquifer were overall low, but data obtained on day 10 indicated a significant bacterial transfer in SIS with a thin vadose zone. Water transit time and water saturation of the vadose zone were found important parameters for bacterial transfers. Most bacterial taxa (>60%) from impacted groundwaters were not detected in stormwater runoff and in non-impacted groundwaters, indicating that groundwater bacterial communities were significantly modified by processes associated with infiltration (remobilization of bacteria from vadose zone and/or species sorting). [Display omitted] •Nutrient and bacterial transfers were investigated in 6 stormwater infiltration systems.•Dissolved oxygen and phosphate transfers were significantly influenced by vadose zone thickness.•Dissolved organic matter was efficiently retained and consumed whatever the vadose zone thickness.•Bacterial transfers to groundwater decreased with vadose zone thickness.•Water saturation and water transit time in the vadose zone were factors influencing bacterial transfers.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2018.05.094