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Conventional water analysis based on influent sampling holds a limitation of accuracy due to fluctuation of influent composition in time. The study was aimed at identification of the composition from a back-calculation of biological responses in the activated sludge reactor. The developed approach was based on IWA ASM1, which was structured by the influent constituents. A pilot-scale activated sludge 2 reactors (with and without primary settler were installed and operated continuously at Doan Thi Diem Str., Hue, Vietnam. Focusing on the activated sludge sampled from the reactor with a settler, the soluble biodegradable organic concentration in the influent was calculated. From the state variables in the activated sludge reactor, the organic matter and nitrogen compounds in the influent were calculated.

ESTIMATION OF BIODEGRADABLE MATERIAL CONCENTRATIONS IN THE SEWAGE USING IWA ACTIVATED SLUDGE MODEL