A biofilter integrated with gas membrane separation unit for the treatment of fluctuating styrene loads

► To provide long-term stable operation by using a biofilter integrated with a gas membrane module. ► Integrated bioreactor reliably treated fluctuating VOC loads with high removal efficiency. ► Styrene separation in the membrane module depended on styrene content and the pressure difference. ► Membrane strengthened biofilter by prolonging retention time and maintaining enough substrate. ► Desiccation tube installed between the biofilter and membrane unit diminished membrane fouling.