Biodegradation potential of sodium dodecyl sulphate (SDS) by mixed cells in domestic and non-domestic actual wastewaters: Experimental and kinetic studies

Abstract

This study aimed to assess and compare the potential of sodium dodecyl sulfate (SDS) biodegradation in four types of real-field effluents including domestic wastewater (DWW), laundry wastewater (LWW), carwash garage wastewater (CWW), and wastewater from household detergent industry wastewater (HWW) using non adapted mixed cells having Pseudomonas medocina and Bacillus as the dominant types of bacterial cells. Examining and comparing various types of actual wastewaters supported the originality of this study by considering different levels of SDS concentrations, meanwhile, taking into account implicitly the effect of different species associated with SDS based on the origin of wastewater. The effect of inoculum size including 1%, 3%, 5%, 7%, and 10% (v/v) as well as the SDS initial concentrations of10, 20, 50, 100, 300, 500, and 1000 mg/L were explored. The results demonstrated that the removal efficiency of SDS in the DWW, LWW, CWW, and HWW were 99.63%, 92.31%, 98.78%, and 85.77%, respectively after 48 h. The outcomes of this study revealed the potential and significance of SDS removal in actual effluents by aerobic biodegradation regardless of its concentration. Haldane kinetics model fitted the experimental data very well compared to Monod and Han-Levenspiel models with determination coefficient (R2), sum square error (SSE), and P-value of 0.96, 1.65 × 10−14, and 1.57×10−5, respectively indicating the inhibitory action of SDS at high concentrations.