Microwave-absorbing Media Cooperative Treatment of PAHs in Coking Wastewater

With polycyclic aromatic hydrocarbons（PAHs） in coking wastewater as research object,activated carbon,steel slag and silicon carbide as absorbing media,PAHs in the coking wastewater was qualitatively and quantificationally analyzed by ultrasonic extraction and high performance liquid chromatography.The influences of microwave temperature,heating time,various types and masses of activated carbon,steel slag and silicon carbide on removal efficiency of PAHs were studied.The experimental results show that the microwave temperature and heating time have a great effect on PAHs removal.The most efficient removal of PAHs with more than 55% of the average removal rate can be obtained at 60 ~90 ℃ of microwave temperature and 9 ~12 min of heating time.Meanwhile,the removal mechanisms of PAHs by absorbing media under microwave radiation were discussed,finding that the activated carbon and silicon carbide have better removal efficiency of PAHs than steel slag and the average removal rate of PAHs for all the absorbing media（activated carbon,silicon carbide and steel slag） is over 30%.Adaptive mass of the absorbing media is beneficial for PAHs removal.