Comparison of the removal efficiency of linear alkylbenzene sulfonate (LAS) by biological and integrated biochemical treatment

In this study, ozone as an advanced oxidation process was used to increase the efficiency of linear alkylbenzene sulfonate (LAS) detergent removal in the treatment of wastewater. The first part of this research contains the study of LAS removal from the wastewater by the Moving Bed Biofilm Reactors (MBBR) biological reactor. For this purpose, the LAS removal efficiency was determined at different levels of LAS (low, medium and high concentrations) for different hydraulic retention times. The results show that increasing the hydraulic retention time had a positive effect on the MBBR reactor, efficiency, but Increasing- LAS Concentration had negative impact on system performance and decreased LAS removal rate. The second part of this research contains a study on LAS removal from the wastewater by using a combination system of MBBR and post-ozonation process. The results show that this combination system can remove LAS completely at the low concentration of LAS and dramatically improving the removal efficiency of LAS in medium and high concentrations.