Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation
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Ohio University / OhioLINK
2013
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ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou13748569312021-08-03T06:18:55Z Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation Xu, Dake Chemical Engineering Microbiologically Influenced Corrosion Sulfate reducing bacteria Nitrate reducing bacteria extracellular electron transfer bioenergentics D-amino acids biocide enhancer Microbiologically influenced corrosion (MIC) has become a major problem in the oil and gas industry due to frequent use of water flooding in enhanced oil recovery that leads to water wetting of pipeline walls. MIC is also of concern in many other industries such as water utilities and nuclear power plants. As infrastructures are aging, MIC threat increases.Sulfate reducing bacteria (SRB) are regarded as the primary culprit for pipeline failures caused by MIC. Due to a lack of understanding, MIC has even been considered to be a myth; in corrosion research. Until recently, there has been no clear mechanism that clarifies why and how MIC happens in the field because of its complexity. Indeed, a mechanism that can cogently explain MIC phenomena is needed. The new biocatalytic cathodic sulfate reduction (BCSR) theory proposed by Gu et al. (2009) is bioelectrochemistry based. In BCSR, the bioenergetics can explain why MIC occurs, while the extracellular electron transfer (EET) theory is able to explain how MIC happens. In this work, solid evidence was found to support BCSR. Additional experimental data suggested that MIC can also be caused by nitrate reducing bacteria (NRB), which led to an analogous biocatalytic cathodic nitrate reduction (BCNR) theory. Another experiment to support BCSR was an electron mediator test designed to verify the EET process proposed in BCSR. The experimental results indicated that common electron mediators like riboflavin and FAD were capable of accelerating MIC by promoting electron transport between an iron surface and a biofilm. A starvation test demonstrated that when lacking organic carbon, elemental iron replaced organic carbons as an energy source/electron donor for SRB to obtain their maintenance energy. The output of the test showed that under severe starvation of organic carbon, the largest pit depth was achieved, which was consistent with the prediction of BCSR.The emerging demand and urgent need in the oil and gas industry is to find an efficient method to prevent and mitigate MIC at a reasonable cost. A mixture of D-amino acids, signal molecules to disperse bacterial biofilm, was selected to act as biocide enhancers. The efficacy of the D-amino acid mixture containing D-tyrosine (D-tyr), D-methionine (D-met), D-tryptophan (D-trp), and D-leucine (D-leu) in equal moles was evaluated. The potential of D-tyr and D-met as individual biocide enhancers was also investigated. Considering the cost, toxicity and their biocide enhancement ability, D-amino acids appear to be very attractive. 2013-09-26 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374856931 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374856931 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemical Engineering Microbiologically Influenced Corrosion Sulfate reducing bacteria Nitrate reducing bacteria extracellular electron transfer bioenergentics D-amino acids biocide enhancer |
| spellingShingle |
Chemical Engineering Microbiologically Influenced Corrosion Sulfate reducing bacteria Nitrate reducing bacteria extracellular electron transfer bioenergentics D-amino acids biocide enhancer Xu, Dake Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation |
| author |
Xu, Dake |
| author_facet |
Xu, Dake |
| author_sort |
Xu, Dake |
| title |
Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation |
| title_short |
Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation |
| title_full |
Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation |
| title_fullStr |
Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation |
| title_full_unstemmed |
Microbiologically Influenced Corrosion (MIC) Mechanisms and Mitigation |
| title_sort |
microbiologically influenced corrosion (mic) mechanisms and mitigation |
| publisher |
Ohio University / OhioLINK |
| publishDate |
2013 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1374856931 |
| work_keys_str_mv |
AT xudake microbiologicallyinfluencedcorrosionmicmechanismsandmitigation |
| _version_ |
1719434631343767552 |