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Modelling thermophilic cheese whey bioremediation in a one-stage process

Paper ID Volume ID Publish Year Pages File Format Full-Text
4701 239 2007 8 PDF Available
Title
Modelling thermophilic cheese whey bioremediation in a one-stage process
Abstract

A one-stage bioremediation process for the treatment of cheese whey has been developed, involving use of a mixed population including Bacillus sp. isolated from fruit–vegetable wastes, at elevated temperatures (55, 60, 65 °C), in an aerated system. Based upon a reaction scheme which combined the activities of Lactococcus sp. and thermotolerant yeasts, found in unpasteurised whey, with that of a thermophilic Bacillus sp., we modelled this process using mass balances for a batch culture. We obtained adequate fits to experimental data by simulating the biodegradation of whey components and consequent biomass growth rates using models containing one “lumped” biomass and three “equivalent” substrates (lactose, lactic and acetic acids), with a further simplification of biomass specific growth rate into one constant, “pseudo-exponential” value over the batch. Values of “best fit” model parameters were generated to predict biomass specific growth rates. The average specific growth rate calculated from the models was 0.075 h−1 whilst the experimental one was 0.088 h−1. The results obtained suggest that temperature may be of greater importance to the biodegradation process than dissolved oxygen, as the composition of the microbial community changed with temperature within the range 55–65 °C. High COD removal efficiencies were achieved: up to 93% at 55 °C, and up to 70% at 65 °C. Our investigations suggest that modelling of complex bioreaction systems via “lumping” of key substrates and microbial species into a limited number of “equivalent clusters” is worthy of consideration as a possible means of facilitating rapid process development and practical process operation.

Keywords
Aerobic processes; Bioremediation; Dynamic modelling; Thermophiles; Whey
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 35, Issue 3, 1 August 2007, Pages 281–288
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