Dynamic Modeling of the Ratio Volatile Fatty Acids/Bicarbonate Alkalinity in a UASB Reactor for Potato Processing Wastewater Treatment |
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Authors: | E M P Barampouti S T Mai A G Vlyssides |
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Institution: | (1) National Technical University of Athens, Chemical Engineering School, 9, Heroon Polytechniou Street, Zographou, Greece |
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Abstract: | In this work, dynamic mathematical model for the prediction of the operational parameter volatile fatty acids/bicarbonate
alkalinity (VFA/ALK) in a UASB reactor was developed. The dynamic modeling technique was applied successfully to a two-year
data record from an industrial wastewater treatment plant of a potato processing industry. The technique used included regression
analysis by residuals. Seventeen parameters were examined including the following: wastewater's flow rate, reactor's temperature
and pH, total and soluble influent COD, wastewater's temperature and pH, total and soluble effluent COD, volatile fatty acids,
alkalinity, biogas production rate and each parameter with a time lag of up to 10 days. Finally, after all parameters and
all time lag trials the best fitted model was developed. The model's adequacy was checked by χ2 test for a data record of the same UASB reactor but at a different time period and proved to be satisfactory. Additionally,
the model's ability to predict and to control the plant's operation via VFA/ALK was examined. Through this model, in contrary
to steady state models, various aspects of the process can be enlighten, such as the fact that the hydrolysis of starch requires
at least a resident time of seven days. |
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Keywords: | alkalinity anaerobic digestion dynamic model potato processing wastewater volatile fatty acids upflow anaerobic sludge blanket |
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