Reducing pollution from the deliming-bating operation in a tannery. Wastewater reuse by microfiltration membranes

► We studied two measures aimed at reducing the nitrogen concentration in a tannery wastewater. ► Ammonium salts were replaced by CO2 in process and wastewater was treated by membranes. ► Two membranes were tested. Different pre-treatments were studied. ► Filtration membrane resistances were calculated to study the fouling. ► Microfiltration permeate was successfully reused in the tannery in lab-scale drums.