Fuzzy Controller for Thermophilic Aerobic Digestion Using Nicotinamide Adenine Dinucleotide Fluorescence
Publication: Journal of Environmental Engineering
Volume 130, Issue 7
Abstract
Simple fuzzy logic control of the thermophilic aerobic digestion (TAD) process was conducted to propose the effective control criteria for the TAD process. Nicotinamide adenine dinucleotide (NADH)-dependent fluorescence, which is the effective indicator to give insight into the status of micro-organisms, was used as the control parameter for the TAD process. The NADH-dependent fluorescence was successfully measured in the pure NADH solution, culture solution, batch TAD, and semicontinuous TAD system using a proposed optic sensor system. From a comparison of the fluorescence signal and process status, it was clear that NADH-dependent fluorescence is a good parameter to control the TAD process. Simple fuzzy logic controller was made by the experts’ experience and used to control the semicontinuous TAD process. A proposed fuzzy logic controller using NADH-dependent fluorescence as a control parameter could successfully control the stable operation of the semicontinuous (fill-and-draw) TAD process.
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Published In
Journal of Environmental Engineering
Volume 130 • Issue 7 • July 2004
Pages: 759 - 765
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Dec 9, 2002
Accepted: May 14, 2003
Published online: Jun 15, 2004
Published in print: Jul 2004
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