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Decolorization of indigo and azo dyes in semicontinuous reactors with long hydraulic retention time

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Title Decolorization of indigo and azo dyes in semicontinuous reactors with long hydraulic retention time
 
Creator MANU, B
CHAUDHARI, SANJEEV
 
Subject azo dyes
bioreactor
chemical oxygen demand
wastewater
 
Description Decolorization studies of simulated wastewater containing vat dye (C.I. vat blue 1: indigo) and azo dyes (Reactive blue H3R and Reactive red HE 7B) have been carried out under anaerobic conditions using mixed bacterial cultures with long hydraulic retention times (HRT). Laboratory scale semicontinuous reactors were operated using simulated cotton dyeing wastewater at ambient temperatures (24–28 °C) by maintaining 10-day HRT for azo dyes and 5-day HRT for indigo dye. Influent dye concentration in wastewater was maintained at 100 mg/l and the reactors were operated for a period of 58 days. The performance of the bioreactors was evaluated by monitoring oxidation–reduction potential (ORP) in the reactor, color and chemical oxygen demand (COD) removal. COD removal of up to 95, 90 and 92% was achieved in a control (no dye), blue and red dye containing reactors. Color removal of 98–99% could be achieved in both the azo dye containing reactors. In the indigo dye containing reactor COD removal of 90% and color removal of up to 95% could be achieved. The results indicated the usefulness of semi-continuous reactors for the degradation of recalcitrant compounds like azo and vat dyes.
 
Publisher Elsevier
 
Date 2009-06-22T07:27:38Z
2011-12-08T08:05:42Z
2011-12-26T13:02:36Z
2011-12-27T05:49:07Z
2009-06-22T07:27:38Z
2011-12-08T08:05:42Z
2011-12-26T13:02:36Z
2011-12-27T05:49:07Z
2003
 
Type Article
 
Identifier Process Biochemistry 38(8), 1213-1221
1359-5113
10.1016/S0032-9592(02)00291-1
http://hdl.handle.net/10054/1569
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1569
 
Language en