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Biological phosphate removal by model based continuous cultivation of Acinetobacter calcoaceticus

Paper ID Volume ID Publish Year Pages File Format Full-Text
36384 45131 2006 7 PDF Available
Title
Biological phosphate removal by model based continuous cultivation of Acinetobacter calcoaceticus
Abstract

Batch cultivation of Acinetobacter calcoaceticus was carried out under statistically optimized culture conditions in order to study the kinetics of growth and phosphate uptake. It featured a biomass accumulation of 4.08 g L−1 with a consumption of 0.14 g L−1 phosphate (from initial phosphate concentration of 0.18 g L−1) in 11 h. Inhibition studies with respect to carbon, nitrogen and phosphate were also performed to quantify their limiting and/or inhibitory effect on specific growth rate. Using above kinetics/inhibition data, mathematical model equations were proposed and then model parameters were identified for batch cultivation of A. calcoaceticus. The batch model was extrapolated for continuous cultivation so as to predict, steady state concentrations of process variables and identify suitable nutrient feeding strategies for even better/quicker phosphate removal. In order to make a comprehensive study of the effect of dilution rate on culture growth and phosphate uptake, different dilution rates of 0.04, 0.09, 0.13, 0.19, 0.3, 0.4 h−1 were utilized in the model to predict transient and steady state data, which were experimentally verified to establish the validity of the model. It was observed that as the dilution rate increased, the steady state biomass concentration gradually decreased and residual substrate concentration increased, indicating the applicability of well-known Monod type growth pattern. Best biomass accumulation (3.5 g L−1) and phosphate uptake (∼76%) was obtained at D = 0.09 h−1 experimentally. Studies in a continuous stirred tank reactor (CSTR) demonstrated the feasibility to achieve faster phosphate removal without inherently slow anaerobic phase involvement.

Keywords
Phosphate removal; Acinetobacter calcoaceticus; Aerobic; Batch; Mathematical model; Continuous cultivation
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Biological phosphate removal by model based continuous cultivation of Acinetobacter calcoaceticus
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 3, March 2006, Pages 624–630
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