NDLI: Fate of individual sewage disposal system wastewater within regolith in mountainous terrain

Content Provider	Springer Nature Link
Author	Da, Kathleen Poeter, Eileen Thyne, Geoff
Copyright Year	2007
Abstract	In order to improve understanding of the fate of septic tank or individual sewage disposal system (ISDS) effluent in regolith overlying fractured-rock aquifers, effluent from an ISDS in such a setting was tracked via geophysical, hydrological, and geochemical methods. Under typical precipitation conditions, the effluent entered the fractured bedrock within 5 m of the boundary of the constructed infiltration area. During a period of unusually high spring recharge, the plume migrated between 50 and 100 m within the regolith before infiltrating the fractured bedrock. The chemical signature of the effluent is similar to that required to account for the decline in water quality, suggesting a causative relationship (as estimated from mass-balance models of the surface-water chemistry near the mouth of the basin). The elevated salt content of the effluent during periods of high natural recharge to the infiltration area correlates with elevated salt concentrations in surface and groundwater at the basin scale, suggesting that some of the effluent salt load may be stored in the unsaturated zone during dry periods and flushed during periods of elevated natural recharge.Afin de connaître mieux le devenir des fosses sceptiques et des systèmes individuels d’épuration d’effluent (ISDS en anglais) mis en place dans des régolites recouvrant des aquifères fracturés, la trajectoire de l’effluent d’un système ISDS installé dans un tel contexte a été étudiée en utilisant des méthodes géophysiques, hydrologiques et géochimiques. Dans le cas de conditions normales de précipitation, l’effluent a pénétré le sous-sol fracturé à moins de 5 m de la limite de la zone d’infiltration aménagée. Dans le cas d’une période de recharge printanière très importante, le panache s’est étendu entre 50 et 100 m à l’intérieur des régolites avant de s’infiltrer dans le sous-sol fracturé. La signature chimique de l’effluent montre que celui-ci pourrait être responsable de la dégradation de la qualité de l’eau et suggère une relation de cause à effet (également estimé par des modèles de bilan de masse pour la chimie des eaux de surface au niveau de la sortie du bassin). La teneur élevée en sels de l’effluent, lorsqu’une recharge naturelle importante a lieu au niveau de la zone d’infiltration, est corrélée avec des concentrations en sels élevées dans les eaux de surface et souterraine à l’échelle du basin. Ceci suggère qu’une partie de la charge en sels de l’effluent soit stockée dans la zone non-saturée du sol lors des périodes sèches et qu’elle soit remobilisée lors des périodes de recharge naturelle importante.Para mejorar la comprensión del destino de un efluente de tanque séptico o sistema individual de eliminación de aguas residuales (SIEAR) instalado en regolita que sobreyace acuíferos de roca fracturada, un efluente de un tanque séptico fue monitoreado con métodos geofísicos, hidrológicos y geoquímicos. Bajo condiciones típicas de precipitación, el efluente entró en el basamento fracturado dentro de 5 m del área construida para infiltración. Durante un periodo con recarga inusualmente alta, la pluma migró entre 50 y 100 m dentro de la regolita antes de infiltrar el basamento fracturado. La composición química del efluente es similar a la requerida para considerar un deterioro de calidad de agua sugiriendo una relación causal (partiendo de modelos de balance de masas de la química del agua superficial cerca del inicio de la cuenca). El contenido elevado de sal en el efluente durante periodos de alta recarga natural al área de infiltración se correlaciona bien con concentraciones elevadas de sal en agua superficial y subterránea en la escala de la cuenca sugiriendo que algo de la carga de sal del efluente podría ser almacenado en la zona no saturada durante periodos secos y liberado durante periodos de elevada recarga natural.
Starting Page	691
Ending Page	699
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-01-04
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Waste disposal Fractured rocks Septic system Hydrochemical modeling Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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