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Received July 31, 2007
Accepted September 20, 2007
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Non-steady state estimation of biodegradability of dyeing wastewater using respirometer
Textile Ecology Laboratory, Korea Institute of Industrial Technology, Cheonan 330-825, Korea 1Department of Environmental Engineering, Hoseo University, Asan 336-795, Korea
cis@hoseo.edu
Korean Journal of Chemical Engineering, May 2008, 25(3), 553-557(5), 10.1007/s11814-008-0093-3
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Abstract
Dyeing wastewater is notorious for its non-readily-biodegradability because it contains various kinds of refractory chemicals. To set up a strategy for controlling the dyeing wastewater discharged into conventional wastewater treatment plants, obtaining bio-kinetic information such as maximum specific growth rate (μmax) and half saturation constant (Ks) should first be done. To estimate the biodegradability of the dyeing wastewater, bio-kinetic constants of the artificially formulated dyeing wastewater containing 33 different dyes and auxiliaries were determined by using a respirometer. Activated sludge acclimated to the artificial dyeing wastewater was inoculated to the respirometer and the bio-kinetic constants were determined from oxygen uptake data. The μmax was found to 0.06 hr.1, which is 3 to 15 times smaller than that of the typical activated sludge for sewage treatment. The Ks was found to 210 mg/L, which was 3.5 to 21 times higher than that of the normal activated sludge.
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