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A simple model to describe the performance of highly-loaded aerobic COD removal reactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
2711 127 2016 9 PDF Available
Title
A simple model to describe the performance of highly-loaded aerobic COD removal reactors
Abstract

•A simple model for simultaneous growth and adsorption of COD was developed.•COD removal in a full scale A-stage was correctly described by the model.•Dynamic simulations correctly described a period of reactor operation of one year.

Highly-loaded aerobic chemical oxygen demand (COD) removal reactors (also known as A-stage) include two main processes, COD removal by heterotrophic biomass and adsorption of COD on the activated sludge. A simple model to describe highly-loaded aerobic COD removal reactors has been developed. A one-year-set of measured data from a full scale wastewater treatment plant has been used to calibrate the efficiency of the adsorption and to evaluate the ability of the mathematical model to describe the measured data in both steady state and dynamic conditions. The approach lumped the efficiency of the settler and the adsorption with a simple but powerful approach which includes the use of the measured sludge retention time (SRT) and the settling efficiency. The effects of dynamics in terms of (i) seasonality (for water temperature, flow rate and concentration of pollutants), and (ii) daily variations in flow rate were investigated. Results showed how during winter the low water temperatures negatively impacted the efficiency of the A-stage, producing a higher COD concentration in the effluent, which eventually could impact the performance of the nitrogen removal in the B-stage. General guidelines for the application of the model to similar highly loaded A-stage reactor systems were provided.

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Keywords
Adsorption; Biosorption; Dynamic simulation; AB process; A-stage; Modelling
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A simple model to describe the performance of highly-loaded aerobic COD removal reactors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 112, 15 August 2016, Pages 94–102
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us