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Respirometry for the Assessment of Organics Biodegradability in Municipal Wastewater: I. Respirometry  

Kim, Dong Han (서원대학교 환경건설정보학과)
Kim, Hee Jun (서울대학교 지구환경시스템공학부)
Chung, Tai Hak (서울대학교 지구환경시스템공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.18, no.1, 2004 , pp. 29-36 More about this Journal
Abstract
Organics may be divided into biodegradable and nonbiodegradable fractions on the basis of biodegradability. Biodegradable organics may be subdivided into readily and slowly biodegradable fractions. As this biodegradability of organics in municipal wastewater has a great influence on the efficiency of a biological nutrient removal process, it has been assessed by respirometry. The respirometer, which consisted of a respiration chamber and a respiration cell, was used to measure the respiration rate of biomass utilizing the readily biodegradable organics. The readily biodegradable organics are about 10% of the COD in municipal wastewater. The adequate ratio of wastewater to sludge volume and the concentration of sludge are required in measuring the respiration rate due to the readily biodegradable organics. By using a biochemical oxygen demand test, the slowly biodegradable organics including biomass are estimated about 66% of COD. The soluble inert organics are about 11% of COD. On the basis of mass balance, the particulate inert organics are estimated about 13% of COD.
Keywords
respirometry; biodegradability; readily biodegradable organics; slowly biodegradable organics;
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