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: The biochemical oxygen demand (BOD) of aqueous liquids containing organic matter is determined. A microorganism culture is aerated to exhaust the organic matter available to the microorganisms. An aqueous liquid test sample containing organic matter is added to the exhausted culture to measure the amount of oxygen consumed by the microorganisms. The determination of biochemical oxygen demand (BOD) of the sample is determined in as little as 20 minutes. An apparatus is provided for determining BOD comprising a magnetic stirrer, an aerating instrument, a dissolved oxygen/temperature sensor, tubing pumps and a quick biochemical oxygen demand (QBOD) bottle. The BOD may be automatically calculated using the apparatus.