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Comparison of Anaerobic Acrylic Acid Biotransformation in Single‐ and Two‐Stage pH‐Stat Completely Stirred Tank Reactor Systems
Performance of single‐ and two‐stage pH‐stat completely stirred tank reactor (CSTR) systems for anaerobic acrylic acid biotransformation was investigated and compared. In the experiments, acetate was added with acrylic acid. Acetate concentration in both single‐ and two‐stage reactors was continuously maintained at a nonlimiting concentration of 2000 200 mg/L using a computercontrolled pH‐stat system to allow observation of the effect of acrylate biotransformation on the more sensitive methanogenic step. For this purpose, conventional (one‐stage) and two‐stage pH‐stat CSTR systems with the same acrylic acid loading strategy were operated under the same conditions, and their performances were compared. The food‐to‐microorganism ratio in the first stage of the two‐stage system was maintained at approximately two times that of the one‐stage system. Furthermore, relatively high acrylate concentrations and dilution rateswere achieved in the first stage of the two‐stage system. Results revealed that the two‐stage pH‐stat CSTR system provided better effluent quality and more stable operation with the toxic effects of acrylic acid and its intermediate products than the single‐stage system
Comparison of Anaerobic Acrylic Acid Biotransformation in Single‐ and Two‐Stage pH‐Stat Completely Stirred Tank Reactor Systems
Performance of single‐ and two‐stage pH‐stat completely stirred tank reactor (CSTR) systems for anaerobic acrylic acid biotransformation was investigated and compared. In the experiments, acetate was added with acrylic acid. Acetate concentration in both single‐ and two‐stage reactors was continuously maintained at a nonlimiting concentration of 2000 200 mg/L using a computercontrolled pH‐stat system to allow observation of the effect of acrylate biotransformation on the more sensitive methanogenic step. For this purpose, conventional (one‐stage) and two‐stage pH‐stat CSTR systems with the same acrylic acid loading strategy were operated under the same conditions, and their performances were compared. The food‐to‐microorganism ratio in the first stage of the two‐stage system was maintained at approximately two times that of the one‐stage system. Furthermore, relatively high acrylate concentrations and dilution rateswere achieved in the first stage of the two‐stage system. Results revealed that the two‐stage pH‐stat CSTR system provided better effluent quality and more stable operation with the toxic effects of acrylic acid and its intermediate products than the single‐stage system
Comparison of Anaerobic Acrylic Acid Biotransformation in Single‐ and Two‐Stage pH‐Stat Completely Stirred Tank Reactor Systems
Demirer, Göksel N. (author) / Speece, Richard E. (author)
Water Environment Research ; 72 ; 84-89
2000-01-01
6 pages
Article (Journal)
Electronic Resource
English