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Modeling and Simulation of Anaerobic Wastewater Treatment and Its Application to Control Design: Case Whey
Author(s) -
Ryhiner Gerhard B.,
Heinzle Elmar,
Dunn Irving J.
Publication year - 1993
Publication title -
biotechnology progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.572
H-Index - 129
eISSN - 1520-6033
pISSN - 8756-7938
DOI - 10.1021/bp00021a013
Subject(s) - chemistry , mass transfer , acetogenesis , wastewater , anaerobic exercise , butyric acid , thermodynamics , control theory (sociology) , chromatography , anaerobic digestion , environmental science , computer science , organic chemistry , physics , environmental engineering , control (management) , physiology , methane , artificial intelligence , biology
Abstract Modeling and simulation of the anaerobic treatment of whey wastewater was studied. A model inpluding five groups of organisms, whey substrate, butyric, propionic, and acetic acids, CO 2 , H 2 , and CH 4 , was developed for single‐ and two‐stage anaerobic fluidized bed reactors. It included thermodynamic limitations for the acetogenesis reaction, acid‐base equilibria of dissociating compounds (organic acids and CO 2 ) for variable and constant pH situations, gas‐liquid phase mass transfer, and measurement dynamics. The model was adequate to describe both the steady‐state and dynamic behavior of the reactors and was used to study various control schemes. In all cases the feed flow rate was the manipulated variable. Controls of pH, dissolved hydrogen, and organic acids were all successful in simulation and experiment. Simulations were used to determine optimal control parameters for conventional proportional—integral (PI) or proportional—integral—differential (PID) control. The experimentally found optimal values were in close agreement with predetermined simulated values. Simple control using gas analysis results did not give stable control, either in the simulation or in the experiment.