History of Biofilters and Biofiltration Treatment
Biological treatment or biofiltration is now the mainstay of wastewater management systems. Patent applications for odor control using biofiltration have been filed since the 1950s for soil filters and large biological trickling filter plants.
Biofilters have been designed primarily for odor control at wastewater treatment plants, rendering plants, and composting operations. They are becoming more popular in the treatment of VOCs (volatile organic compounds), as an innovative method to treat toxic air emissions from commercial processes.
What Does a Biofilter Do?Biofilters perfom the removal and oxidation of compounds from contaminated air using microorganisms. Smelly air emissions generally contain low concentrations of hydrogen sulfide, mercaptons, and other reduced sulfur compounds.
During the 1990s, biofilters were also used to remove airborne contaminants, including aliphatic and aromatic hydrocarbons, alcohols, aldehydes, organic acids, acrylate, carbolic acids, amines and ammonia. These substances are not just smelly, they are dangerous as well.
Timeline: History of Biofilters