BIOFILTER FOR REMOVAL OF ODOR AND VOCS

摘要

PURPOSE: A biofilter for removal of odor and VOCs from flue gas is provided which shows stable removal efficiency under the wide range of loading and flow-rate conditions. The application of the biofilter is also expected to require less reactor volume and shorter acclimation period than the conventional biofilter. CONSTITUTION: Media are composed of charcoal, polyurethane, and igneous rocks which are produced in Korea and have the diameter of 12-17mm. Seeded microorganisms are Thiobacillus sp. and Bacillus sp.. The process is composed of pretreatment equipment, humidifying equipment, and biofilter as shown in the drawing. Particulate matters are removed from flue gas and the temperature of gas is controlled in order to acquire proper conditions for the next treatment steps by pretreatment equipment. Afterward humidifying equipment supply microorganisms moisture. Actually odor and VOCs are removed by attached microorganisms at biofilter. The currents of flue gas in the biofilter can be downflow (a3) or upflow (b3). It can be achieved to obtain good and stable removal efficiency of 99.9% or higher under high loading-rate and various flow-rate conditions by the process. Therefore, the size of biofilter can be reduced to the half of the conventional biofilter. It can also be achieved to reduce the acclimation period from 1-3 months of conventional biofilter to 15 days.