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A kinetic model of a recirculated upflow anaerobic sludge blanket treating phenolic wastewater

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Sludge taken from a recirculated upflow anaerobic sludge blanket (RUASB) treating phenolic wastewater at organic loadings of 6, 12, 16, and 20 kg COD/m3 day was tested by the biochemical methane potential (BMP) method at intervals over a three-year period for an accurate determination of the specific gas production rate. A modified version of the Haldane equation was used in the selection of a statistically significant model describing this process. Statistical diagnosis was carried out with student t-test, Durbin-Watson test for two-tail distribution and Kalmogorov-Smirmov statistical approach. The estimated ranges of the maximum specific reaction rate, K; saturation constant, K s inhibitor constant, K i ; and the order of inhibition, n were as follows: 280–764 mL biogas/gVSS-day, 202–398 mg phenol/L, 516–880 mg phenol/L, and 1.47–2.51, respectively. The physical meaning of these parameters is explained. BMP tests with sludge taken from the recirculating upflow anaerobic sludge blanket (RUASB) bioreactor running at a loading of 14 kg COD/m3 day validated the effectiveness of the selected model through comparisons of experimental data and predictions. The results indicate that model predictions accurately reflect experimental data within one standard deviation.
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Keywords: kinetics; methanogenesis; model; phenolics; sludge; treatment

Document Type: Research Article

Publication date: 1994-09-01

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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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