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51313-02181-Application of XDLVO Theory in Modeling SRB Adhesion on Collector Surfaces

Picture for Application of XDLVO Theory in Modeling SRB Adhesion on Collector Surfaces
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Product Number: 51313-02181-SG
ISBN: 02181 2013 CP
Author: Tesfaalem Gebremedhin Haile
Publication Date: 2013
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In this paper the application of Extended Derjaguin Landau Verwey Overbeek (XDLVO) theory to elucidate the initial events in the adhesion of sulfate reducing bacteria (SRB) to various collector surfaces leading to microbiologically induced corrosion (MIC) was thoroughly studied.  Desulfovibrio (D.) desulfricans D. singaporenus and Marine SRB isolates were used as model bacteria with conditioned and unconditioned stainless steel (SS) and Aluminum 1100 as collector surfaces.  The interaction between SRB and FeS2 Fe2O3 and Al2O3 was also investigated to determine the effect of scales in biofilm formation. The adhesion energy between D. desulfricans and D. singaporenus SRB and a conditioned SS steel surface was higher than that of an unconditioned surface; -9.68×10-14 – to - -9.40×10-14 J and  -49.9×10-18 - to -194×10-18 J respectively. The interaction between the Marine SRB isolate and Al 1100 was the highest (-14.9×10-14J) compared to that of D. desulfricans (-9.31×10-14 J). For Al2O3 and Fe2O3 the model suggests the repulsive force is highest for both D. desulfricans and D. singaporenus at the lowest separation distance of 0.157 nm. However the interaction between D. desulfricans and D. singaporenus in the presence of FeS2 (i.e. pyrite) was found to be thermodynamically favourable for interaction between the bacteria and the pyrite with a corresponding value of -130×10-18J and -49.9×10-18J respectively.  Our findings indicate the conditioning film favours the initial adhesion of SRB on the SS surface. The overall adhesion energy was dominated by electrostatic interaction followed by Lewis acid-base interaction. The contribution of the apolar Lifshitz van der Waals interaction was minimal.  Therefore this suggests these bacteria can readily attach and develop a biofilm on the stainless steel aluminum as well as on sulfide scales.  Hence this infers that MIC is not impeded on corrosion product scales such as iron sulphides where they form in the case of both stainless and carbon steels but not with aluminum.  Notwithstanding iron oxides such as hematite and alumina do not support biofilm formation and growth. 


Keywords: SRB MIC XDLVO theory Ionic strength stainless steel scale     adhesion energy
 

In this paper the application of Extended Derjaguin Landau Verwey Overbeek (XDLVO) theory to elucidate the initial events in the adhesion of sulfate reducing bacteria (SRB) to various collector surfaces leading to microbiologically induced corrosion (MIC) was thoroughly studied.  Desulfovibrio (D.) desulfricans D. singaporenus and Marine SRB isolates were used as model bacteria with conditioned and unconditioned stainless steel (SS) and Aluminum 1100 as collector surfaces.  The interaction between SRB and FeS2 Fe2O3 and Al2O3 was also investigated to determine the effect of scales in biofilm formation. The adhesion energy between D. desulfricans and D. singaporenus SRB and a conditioned SS steel surface was higher than that of an unconditioned surface; -9.68×10-14 – to - -9.40×10-14 J and  -49.9×10-18 - to -194×10-18 J respectively. The interaction between the Marine SRB isolate and Al 1100 was the highest (-14.9×10-14J) compared to that of D. desulfricans (-9.31×10-14 J). For Al2O3 and Fe2O3 the model suggests the repulsive force is highest for both D. desulfricans and D. singaporenus at the lowest separation distance of 0.157 nm. However the interaction between D. desulfricans and D. singaporenus in the presence of FeS2 (i.e. pyrite) was found to be thermodynamically favourable for interaction between the bacteria and the pyrite with a corresponding value of -130×10-18J and -49.9×10-18J respectively.  Our findings indicate the conditioning film favours the initial adhesion of SRB on the SS surface. The overall adhesion energy was dominated by electrostatic interaction followed by Lewis acid-base interaction. The contribution of the apolar Lifshitz van der Waals interaction was minimal.  Therefore this suggests these bacteria can readily attach and develop a biofilm on the stainless steel aluminum as well as on sulfide scales.  Hence this infers that MIC is not impeded on corrosion product scales such as iron sulphides where they form in the case of both stainless and carbon steels but not with aluminum.  Notwithstanding iron oxides such as hematite and alumina do not support biofilm formation and growth. 


Keywords: SRB MIC XDLVO theory Ionic strength stainless steel scale     adhesion energy
 

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