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Microaerophilic–aerobic sequential batch reactor for treatment of azo dyes containing simulated wastewater

IR@NEERI: National Environment Engineering Research Institute

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Title Microaerophilic–aerobic sequential batch reactor for treatment of azo dyes containing simulated wastewater
 
Creator Sandhya, S
Padmavathy, S
Swaminathan, K
Subrahmanyam, Y V
Kaul, S N
 
Subject Industrial Wastewater Treatment & Disposal
 
Description Azo dyes are considered to be resistant to attack by aerobic microorganisms and not amenable to aerobic effluent treatment process. Azo dyes are decolorized under anaerobic or microaerophilic condition by the enzyme azoreductase secreted by microorganisms. The present study is a new approach to decolorization and biodegradation of azo dyes from simulated wastewater in an aerobic sequencing batch reactor. Facultative microorganisms under microaerophilic conditions decolorize azo dyes and total biodegradation occurs under aerated conditions. Laboratory flask experiments with various combination modes of aeration and static have shown 92.84% initial COD reduction along with 99.0% decolorization. Accordingly, an investigation was made on a laboratory scale to assess the feasibility of microaerophilic fixed film bed reactor system to decolorize simulated textile wastewater including the influence of operating conditions. Work was carried out with a laboratory scale down flow reactor, equipped with beads used in insulation as support. A continuous reactor for decolorization/biodegradation of azo dyes in aerobic sequencing reactor needs an understanding of a sequence. The first reactor was always operated under microaerophilic down flow fixed film fixed bed conditions, where the azo dyes from simulated wastewater were decolorized at 7.72 h hydraulic retention time with 2.2392 kg/m3 per day loading rate. COD reduction of 74.67% was achieved. The second reactor operated in a down flow fixed bed, and shows a significant decrease in COD along with ammonia, nitrite and nitrate.
 
Date 2005
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/167/1/Sandhyas1.pdf
Sandhya, S and Padmavathy, S and Swaminathan, K and Subrahmanyam, Y V and Kaul, S N (2005) Microaerophilic–aerobic sequential batch reactor for treatment of azo dyes containing simulated wastewater. Process Biochemistry, 40. pp. 885-890.
 
Relation http://neeri.csircentral.net/167/