Subsurface Based Contaminant Transport Modelling of SDS Nac12h25so4

Abstract

Subsurface contamination by emerging contaminants from inappropriate effluent discharge is one of the serious issues directly affecting the quality of groundwater. This study is aimed at transport and transformations of anionic surfactant (SDS). Sodium Dodecyl Sulfate [NaC12H25SO4 ] from grey wastewater containing detergents in unsaturated soils and its impacts on groundwater. HYDRUS-1D model to predict the transport mechanisms was developed. In this regard, surfactant concentrations for SDS from the sewage treatment plant of KCET, Virudhunagar was taken for evaluation. This research work reveals that inlet, outlet, sludge with ample quantities of SDS concentrations (13, 9.55 and 15.67 mg/L). Soil irrigated with sewage was taken as primary sample. Soil column experiments were conducted first with tracer to calculate the dispersion at a flow rate of 1 cm/h, estimated to be 3.1cm. A series of transport experiments were started with 10 mg/L of SDS to comprehend the sorption tied biodegradation. It was observed that leaching phenomenon was the dominant process when compared to biodegradation and sorption. An initial concentration of 13.44 mg/L was administered and found 12 mg/L at the outlet. Hence, 1.44 mg/L underwent sorption and biodegradation. The model estimated linear sorption parameter with first order degradation coefficient 0.131cc/g and 0.01/h. The calibrated HYDRUS model was adopted to study the various scenarios with GWT depth of 30 m. The simulated SDS concentration at GWT of 30m is 4.13mg/litre.