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Optimization of several hydrodynamic and non-hydrodynamic operating parameters in treatment of synthetic wastewater containing wheat starch in a sequencing batch reactor (SBR) using response surface methodology

Synthetic wastewater containing wheat starch was treated using sequencing batch reactor (SBR) system working with bio sludge extracted from cow dung. In the first stage, full factorial design was used to investigate the impact of four hydrodynamic variables on process responses and optimum condition...

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Published in:Desalination and water treatment 2016-11, Vol.57 (51), p.24240-24256
Main Authors: Zeynali, Vahid, Sargolzaei, Javad, Moghaddam, Amin Hedayati
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Language:English
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description Synthetic wastewater containing wheat starch was treated using sequencing batch reactor (SBR) system working with bio sludge extracted from cow dung. In the first stage, full factorial design was used to investigate the impact of four hydrodynamic variables on process responses and optimum condition was detected. In the second stage, the most important hydrodynamic factor together with four different factors comprised a new design based on the response surface methodology and central composition design. Removal efficiency of starch (COD removal), effluent, and sludge quality were assessed as process responses. Impeller diameter and reactor geometry did not show strong impact on responses. Both designs showed superior results in predicting SBR performance. The analyses revealed that interactions between variables are crucially important and should be accounted in wastewater management. Moreover, it was attained that independent factors have diverse effects on responses which intensifies the necessity of optimization on all dependent parameters. In the optimum condition of the second design, COD removal of 92%, TSS of 38 mg/L, and SVI of 57 ml/g were obtained.
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subjects Batch reactors
Cattle manure
Design analysis
Design engineering
Dung
Fluid dynamics
Fluid flow
Full factorial design
Hydrodynamics
Optimization
Reactors
RSM
SBR
Sludge
Starch
Starches
Synthetic starch wastewater
Triticum aestivum
Wastewater management
Wheat
title Optimization of several hydrodynamic and non-hydrodynamic operating parameters in treatment of synthetic wastewater containing wheat starch in a sequencing batch reactor (SBR) using response surface methodology
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