Comparison of Anaerobic Acrylic Acid Biotransformation in Single- and Two-Stage pH-Stat Completely Stirred Tank Reactor Systems

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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


Document Type: Research Article


Publication date: January 1, 2000

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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