Print: | ISSN 0256-1115 |
Online: | ISSN 1975-7220 |
Korean Journal of Chemical Engineering,
Vol.25, No.3, 553-557, 2008 Non-steady state estimation of biodegradability of dyeing wastewater using respirometer
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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