Treatment of gaseous alpha-pinene by a combined system containing photo oxidation and aerobic biotrickling filtration

► Compared to single BTF, the UV-BTF could treat much higher concentration of α-pinene. ► UV-BTF possessed higher CO2 productions without any second pollution caused by UV. ► UV-BTF possessed shorter recovery times than the single BTF after re-start operation. ► Photodegradation products affected the microbial communities in the subsequent BTF.