ABSTRACT
Besides odor, there are other compounds that are considered as air pollutants. Odor is always a major concern regardless of whether it’s sewage collection, sewage treatment, or treatment of waste materials such as by composting. Organoleptic methods for odor detection and measurement are those that use the human olfactory system. Foul air would flow upward through a bed of fixed media while scrubbing liquid would flow downward. Biofiltration is an air pollution control technology that uses a biologically active, solid media bed to absorb/adsorb compounds from the foul air stream and retain them for their subsequent biological oxidation. The biofilter media must support a healthy microbial biomass, have a high surface area on which to grow the biomass, be permeable to air and water, have a high water holding capacity, and be relatively low in cost. When using air, the biotrickling filter was termed slightly aerobic, whereas with nitrate it was termed anoxic.
