Fig. 6From: Enhancement of using combined packing materials on the removal of mixed sulfur compounds in a biotrickling filter and analysis of microbial communitiesActual photograph of the biotrickling filters (1) nutrient solution, (2) bottom filter bed, (3 and 5) filter materials sampling ports, (4) upper filter bed, (6) peristaltic pump, (7) syringe pump, (8) gas flowmeterBack to article page