Effluent flux prediction in variably saturated soil zones within a septic tank—soil absorption trench
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چکیده
منابع مشابه
Soil Absorption and Treatment of Septic Tank Effluent
Septic tank effluent is inherently high in sodium ions relative to divalent cations (high sodium adsorption ratio). The disposal of septic tank effluent to the soil will cause the sodium ions to disperse the clay colloids, resulting in a physical blocking of the soil pores. Hydraulic conductivity will be reduced and the effluent will fail to dissipate into the soil profile. In designing the dis...
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Microbial diversity of septic tank effluent (STE) and the biomat that is formed as a result of STE infiltration on soil were characterized by 16S rRNA gene sequence analysis. Results indicate that microbial communities are different within control soil, STE, and the biomat and that microbes found in STE are not found in the biomat. The development of a stable soil biomat appears to provide the ...
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Background/Need: The potential for groundwater contamination by fixed nitrogen forms originating from septic tank soil absorption systems is a widespread and growing concern. This concern is exacerbated by significant difficulties and uncertainties in predicting the transformations and fate of nitrogen in any given soil-based wastewater infiltration system. Monitoring to evaluate the extent to ...
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Trench is connected to very narrow and deep excavation filled with bentonite suspension. This paper presents estimation of its stability in cohesive soil. The stability is assessed by two calculation methods. The first involves the equilibrium of forces acting on the rigid wedge. The second one includes numerical calculations conducted in Plaxis 3D Foundations. A few examples having different d...
متن کاملEect of the shape of the soil hydraulic functions near saturation on variably-saturated ̄ow predictions
Relatively small changes in the shape of the soil water retention curve near saturation can signi®cantly aect the results of numerical simulations of variably saturated ̄ow, including the performance of the numerical scheme itself in terms of stability and rate of convergence. In this paper, we use a modi®ed form of the van Genuchten±Mualem (VGM) soil hydraulic functions to account for a very ...
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ژورنال
عنوان ژورنال: Soil Research
سال: 2006
ISSN: 1838-675X
DOI: 10.1071/sr06007