Kinetics of oxalate degradation in aerated packed-bed biofilm reactors under nitrogen supplemented and deficient conditions

Tharanga N. Weerasinghe Mohottige, Anna H. Kaksonen, Ka Yu Cheng, Ranjan Sarukkalige, Maneesha P. Ginige

Research output: Contribution to journalArticle

Abstract

Destruction of oxalate from alumina-refining process liquor is considered essential for many alumina refineries around the world. Some refineries have embraced the use of aerobic bioreactors as a cost-effective destruction method. These processes are often supplemented with an external nitrogen (N) source to facilitate microbial activity, even though such augmentations are undesirable due to increase of operational costs. Until now, there has also only been little information on oxalate degradation kinetics, although this knowledge is essential to design bioreactor processes. Hence, this study aimed at determining oxalate degradation kinetics in two aerobic packed bed biofilm reactors under both N-supplemented and N-deficient conditions. Michaelis-Menten equation was used to derive kinetic parameters for specific oxalate degradation. The N-deficient culture had a higher affinity (K-m of 458.4 vs. 541.9 mg/L) towards oxalate and a higher maximum specific oxalate removal rate (V-max of 161.3 vs. 133.3 mg/(h.g biomass)) compared to the N-supplemented culture, suggesting that the N-deficient culture is better suited to remove oxalate. Microbial community analysis also showed differences in the composition of the two cultures. Based on the kinetic parameters derived, a novel two step oxalate removal process was proposed that capitalises on higher specific oxalate removal rates for efficient oxalate destruction from waste streams of alumina industry. (C) 2018 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)270-280
Number of pages11
JournalJournal of Cleaner Production
Volume211
DOIs
Publication statusPublished - 20 Feb 2019

Cite this

Mohottige, Tharanga N. Weerasinghe ; Kaksonen, Anna H. ; Cheng, Ka Yu ; Sarukkalige, Ranjan ; Ginige, Maneesha P. / Kinetics of oxalate degradation in aerated packed-bed biofilm reactors under nitrogen supplemented and deficient conditions. In: Journal of Cleaner Production. 2019 ; Vol. 211. pp. 270-280.
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Kinetics of oxalate degradation in aerated packed-bed biofilm reactors under nitrogen supplemented and deficient conditions. / Mohottige, Tharanga N. Weerasinghe; Kaksonen, Anna H.; Cheng, Ka Yu; Sarukkalige, Ranjan; Ginige, Maneesha P.

In: Journal of Cleaner Production, Vol. 211, 20.02.2019, p. 270-280.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinetics of oxalate degradation in aerated packed-bed biofilm reactors under nitrogen supplemented and deficient conditions

AU - Mohottige, Tharanga N. Weerasinghe

AU - Kaksonen, Anna H.

AU - Cheng, Ka Yu

AU - Sarukkalige, Ranjan

AU - Ginige, Maneesha P.

PY - 2019/2/20

Y1 - 2019/2/20

N2 - Destruction of oxalate from alumina-refining process liquor is considered essential for many alumina refineries around the world. Some refineries have embraced the use of aerobic bioreactors as a cost-effective destruction method. These processes are often supplemented with an external nitrogen (N) source to facilitate microbial activity, even though such augmentations are undesirable due to increase of operational costs. Until now, there has also only been little information on oxalate degradation kinetics, although this knowledge is essential to design bioreactor processes. Hence, this study aimed at determining oxalate degradation kinetics in two aerobic packed bed biofilm reactors under both N-supplemented and N-deficient conditions. Michaelis-Menten equation was used to derive kinetic parameters for specific oxalate degradation. The N-deficient culture had a higher affinity (K-m of 458.4 vs. 541.9 mg/L) towards oxalate and a higher maximum specific oxalate removal rate (V-max of 161.3 vs. 133.3 mg/(h.g biomass)) compared to the N-supplemented culture, suggesting that the N-deficient culture is better suited to remove oxalate. Microbial community analysis also showed differences in the composition of the two cultures. Based on the kinetic parameters derived, a novel two step oxalate removal process was proposed that capitalises on higher specific oxalate removal rates for efficient oxalate destruction from waste streams of alumina industry. (C) 2018 Elsevier Ltd. All rights reserved.

AB - Destruction of oxalate from alumina-refining process liquor is considered essential for many alumina refineries around the world. Some refineries have embraced the use of aerobic bioreactors as a cost-effective destruction method. These processes are often supplemented with an external nitrogen (N) source to facilitate microbial activity, even though such augmentations are undesirable due to increase of operational costs. Until now, there has also only been little information on oxalate degradation kinetics, although this knowledge is essential to design bioreactor processes. Hence, this study aimed at determining oxalate degradation kinetics in two aerobic packed bed biofilm reactors under both N-supplemented and N-deficient conditions. Michaelis-Menten equation was used to derive kinetic parameters for specific oxalate degradation. The N-deficient culture had a higher affinity (K-m of 458.4 vs. 541.9 mg/L) towards oxalate and a higher maximum specific oxalate removal rate (V-max of 161.3 vs. 133.3 mg/(h.g biomass)) compared to the N-supplemented culture, suggesting that the N-deficient culture is better suited to remove oxalate. Microbial community analysis also showed differences in the composition of the two cultures. Based on the kinetic parameters derived, a novel two step oxalate removal process was proposed that capitalises on higher specific oxalate removal rates for efficient oxalate destruction from waste streams of alumina industry. (C) 2018 Elsevier Ltd. All rights reserved.

KW - Bioreactor

KW - Kinetics

KW - Nitrogen deficient

KW - Microbial community

KW - Oxalate

KW - LATERITIC BAUXITES

KW - ORGANIC-COMPOUNDS

KW - CHEMISTRY

KW - BACTERIA

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DO - 10.1016/j.jclepro.2018.11.125

M3 - Article

VL - 211

SP - 270

EP - 280

JO - Journal of Cleaner Production

JF - Journal of Cleaner Production

SN - 0959-6526

ER -