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.
Highlights
Rapid growth and mounting production of chemicals over decades end up in discharge of numerous chemical compounds into atmosphere
Most of the usual sewage treatment systems such as Biological Aerated Filter (BAF), Sequencing Batch Reactor (SBR), Rotating Biological Contactor (RBC), Revised Manuscript Received on February 05, 2020. * Correspondence Author Dr P
The sorption, leaching and biodegradation mechanisms were studied in experimental soil columns and HYDRUS 1D model was developed for validation and scenario studies
Summary
Rapid growth and mounting production of chemicals over decades end up in discharge of numerous chemical compounds into atmosphere. Wastewater is mixture of black and grey water. It is desirable to treat these separately to reduce the pollution load coming on the treatment systems. Grey water constitutes 50% to 80% of domestic wastewater resulting in higher concentration of surfactants (chen et al, 2013). Pharmaceutical products and special care products are found in the environment in case of partial treated wastewater discharged to the soil was critically reviewed by Verlicchi and Zambello 2015. Most of the usual sewage treatment systems such as Biological Aerated Filter (BAF), Sequencing Batch Reactor (SBR), Rotating Biological Contactor (RBC), Revised Manuscript Received on February 05, 2020.
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