Influence of transient loading on the removal of high concentrations of VOCs in a biological air filter

In this research, the elimination of high concentrations of toluene and hexane from waste air was studied in a biofilter under transient condition. The system was operated 10 h a day on the air residence times 0.9, 1.5 and 3 min and 2-3.8 gm-3 of pollutant concentration. Regarding the harsh biological condition of biofilter media such as high pollutant concentration and daily intermittent aeration, reaching the steady-state situation and removal efficiency of 90% took about 44 days. The elimination capacity of higher than 62 gm-3h-1 was observed in the entire of the experiment. Results showed that the performance of the system improved gradually after the daily starting the aeration and the times elapsed to achieve the maximum removal efficiency were 2.5 and 1 h for toluene and hexane, respectively.

کلیدواژه ها:

biofilter ، compost ، toluene ، hexane ، transient loading