Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion

Bibliographic Details
Main Author:	Wang, Hua
Language:	English
Published:	University of Akron / OhioLINK 2014
Subjects:	Chemical Engineering
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543805

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-akron13965438052021-08-03T06:23:19Z Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion Wang, Hua Chemical Engineering This dissertation describes the effects of microbial attachment and biofilm formation on microbiologically influenced corrosion (MIC). The participation of microbes in the corrosion process includes initial attachment, biofilm formation, localized environment changing, and eventually, corrosion. Initial microbial attachment is considered as the first step of MIC. In the first part of this study, the initial attachment of three bacteria, Pseudomonas aeruginosa, Escherichia coli, and Pseudomonas putida, on two substrates, glass and octadecyltrichlorosilane (OTS) modified glass, was examined in flow chambers. The attachment trend on glass could be explained by the secondary minima and energy barriers as predicted by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory. This part of study generated some insights into the effects of cell and substrate surface properties on initial bacterial attachment.In addition to the surface and medium properties, other factors such as the shear associated flow conditions could be one of the most important factors affecting initial bacterial attachment as well. In the second part of this study, four bacteria, Staphylococcus epidermidis, P. aeruginosa, P. putida, and E. coli, were examined for their attachment to glass and OTS modified glass under different shears. The results from this part of the study suggested that, without complications from surface features/extracellular polymeric substances (EPS), the analysis based on the XDLVO theory could provide a basis for understanding shear effect on initial bacterial attachment. The critical shear stress, a measure of bacterial attachment strength, was found to be correlated with the maximum attractive force towards the secondary energy minimum. As microbes attach and develop into biofilm on metal surfaces, the localized environment of metal surfaces could be changed by the influence of microbial metabolism. The third part of this study is intended to evaluate how early stage of biofilm formation affects carbon steel and aluminum alloy corrosion. In this part, aluminum alloy (Al 3003 H14) coupons and carbon steel (CS C1010) coupons were used, along with two common bacterial strains, P. aeruginosa and E. coli. Results showed that bacterial attachment strength and subsequent biofilm development could strongly influence metal corrosion behaviors. In the fourth part of this study, corrosion behaviors of carbon steel (CS C1010) and stainless steel (SS 304) in the presence of iron-oxidizing bacteria: Acidithiobacillus ferrooxidans was examined. Results showed that, due to the extremely high oxidizing rate of Fe(II) to Fe(III), A. ferrooxidans cells can accelerate CS corrosion, while SS 304 showed a good resistance to corrosion. The accelerated CS corrosion was likely related to the metabolism of A. ferroxidans, but not to the attachment strength and biofilm development of A. ferroxidans.In the last part, corrosion behaviors of aluminum alloy (Al 2024) in the presence of Trichoderma reesei and Aspergillus niger were evaluated. Results showed that T. reesei or A. niger could not firmly attach to Al coupon surfaces in an aqueous environment, and they could not corrode Al 2024 under our experimental conditions. 2014-05-15 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543805 http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543805 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Chemical Engineering
spellingShingle	Chemical Engineering Wang, Hua Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion
author	Wang, Hua
author_facet	Wang, Hua
author_sort	Wang, Hua
title	Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion
title_short	Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion
title_full	Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion
title_fullStr	Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion
title_full_unstemmed	Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion
title_sort	effects of microbial attachment and biofilm formation on microbiologically influenced corrosion
publisher	University of Akron / OhioLINK
publishDate	2014
url	http://rave.ohiolink.edu/etdc/view?acc_num=akron1396543805
work_keys_str_mv	AT wanghua effectsofmicrobialattachmentandbiofilmformationonmicrobiologicallyinfluencedcorrosion
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Effects Of Microbial Attachment And Biofilm Formation On Microbiologically Influenced Corrosion

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