COD Fractions in Sewage Flowing into Polish Sewage Treatment Plants

Z. Sadecka, A. Jêdrczak, E. Pluciennik-Koropczuk, S. Myszograj and M. Suchowska-Kisielewicz

Abstract
The paper presents the results of studies concerning the designation of COD fraction in raw wastewater. The research was conducted in three mechanical-biological sewage treatment plants. The results were compared with data assumed in the ASM models. During the investigation, the following fractions of COD were determined: dissolved non-biodegradable SI, dissolved easily biodegradable SS, in organic suspension slowly degradable XS, and in organic suspension non-biodegradable XI. The methodology for determining the COD fraction was based on the ATV- A 131guidelines. The real concentration of fractions in raw wastewater and the percentage of each fraction in total COD are different from data reported in the literature.

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Keywords
COD fractions, raw wastewater, ASM models