Treatment of edible oil processing wastewater using micellar-enhanced ultrafiltration process

摘要

In the present study, micellar-enhanced ultrafiltration (UF) has been applied to treat edible oil processing wastewater using linear alkylbenzene sulfonate (LAS) and sodium dodecyl sulfate (SDS) as surfactants. In particular, the effects of different operating conditions on process performance were investigated in terms of product flux and reductions of wastewater turbidity, oil and grease content, chemical oxygen demand (COD), electrical conductivity (EC), and total dissolved solids (TDS). Experimental results showed that transmembrane pressure and temperature of wastewater had direct effect on permeate flux while surfactant concentration influenced it reversely. To achieve the highest pollutants removal, the optimum operating conditions were found and applied. Finally, optimum permeate quality was compared to the permissible limits of environmental standards. As a result, LAS was shown to reduce pollution indicators more effectively in comparison with SDS, since combination of LAS and UF could eliminate turbidity, oil and grease, COD, EC, and TDS by 98, 95.7, 84.7, 90.6, and 90.7%, respectively.