Abstract: Disclosed is a biofilter system for removing volatile organic compounds, generated from various industrial facilities, such as petrochemical plants, refining plants and paint plants, and environmental facilities including sewage treatment plants. The biofilter system comprises a volatile organic compound (VOC) load equilizing portion, a VOC-containing contaminated air transferring portion, a biofiltering portion, and a storing portion for adjusting pH and nutrients in the biofiltering portion. By using such system, an offensive odor and VOC evolved from various industrial facilities and environmental facilities can be efficiently controlled. In addition, even in production processes and storage facilities at which high VOC concentration regulating materials are discontinuously discharged, VOC can be effectively removed.

Abstract: A continuous, quick measurement method of BOD, and an apparatus therefor is disclosed. The apparatus comprises a sample tank in which a sample is prepared suitably for the measurement, a reactor in which microorganisms maintain their activity, a medium reservoir which contains nutrients for the growth of the microorganisms, pumps for transferring liquids, and a microprocessor which controls the operation of all means including a magnetic stirrer for mixing the liquid in the reactor and diagnoses of the apparatus itself. Using the apparatus, the method comprises a continuous culture stage, an endogenous respiration stage, a endogenous respiration rate-measuring stage, a sample feeding stage and a BODq measuring stage. The apparatus can detect BOD in one hour and is very low in error rate. Further, because microorganisms can be continuously cultured, the apparatus is semi-permanent, easy to manage, low in cost and suitable to be operated at a treatment site.