Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment
| Main Author: | |
|---|---|
| Language: | English |
| Published: |
Ohio University / OhioLINK
2018
|
| Subjects: | |
| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541425677541433 |
| id |
ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou1541425677541433 |
|---|---|
| record_format |
oai_dc |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemical Engineering Chemistry Microbiology Materials Science microbiologically influenced corrosion sulfate reducing bacteria sulfate reducing archaea carbon steel nitrate reducing bacteria extracellular electron transfer enhanced oil recovery biocide D-amino acid peptide electrochemical measurements |
| spellingShingle |
Chemical Engineering Chemistry Microbiology Materials Science microbiologically influenced corrosion sulfate reducing bacteria sulfate reducing archaea carbon steel nitrate reducing bacteria extracellular electron transfer enhanced oil recovery biocide D-amino acid peptide electrochemical measurements Jia, Ru Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment |
| author |
Jia, Ru |
| author_facet |
Jia, Ru |
| author_sort |
Jia, Ru |
| title |
Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment |
| title_short |
Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment |
| title_full |
Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment |
| title_fullStr |
Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment |
| title_full_unstemmed |
Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment |
| title_sort |
mechanisms of microbiologically influenced corrosion caused by corrosive biofilms and its mitigation using enhanced biocide treatment |
| publisher |
Ohio University / OhioLINK |
| publishDate |
2018 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541425677541433 |
| work_keys_str_mv |
AT jiaru mechanismsofmicrobiologicallyinfluencedcorrosioncausedbycorrosivebiofilmsanditsmitigationusingenhancedbiocidetreatment |
| _version_ |
1719454451340673024 |
| spelling |
ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou15414256775414332021-08-03T07:08:42Z Mechanisms of Microbiologically Influenced Corrosion Caused by Corrosive Biofilms and its Mitigation Using Enhanced Biocide Treatment Jia, Ru Chemical Engineering Chemistry Microbiology Materials Science microbiologically influenced corrosion sulfate reducing bacteria sulfate reducing archaea carbon steel nitrate reducing bacteria extracellular electron transfer enhanced oil recovery biocide D-amino acid peptide electrochemical measurements Corrosion influenced or driven by the presence or activities of microorganisms is known as biocorrosion or microbiologically influenced corrosion (MIC). MIC has been recognized as a significant problem in many industrial systems such as power plant cooling systems, oil and gas transportation, and water utilities. In nature, different types of microorganisms live in a community that attaches to materials such as metals to form a biofilm. Microbes in the biofilm are responsible for MIC. Thus, it is critical to understand the corrosion mechanisms that are caused by different microbes and find better ways to treat biofilms.The main importance of this work is listed below:(1)H2S is not the primary contributing factor in carbon steel MIC by sulfate reducing bacteria (SRB).(2)Sulfate reducing archaeon (SRA) is corrosive against C1018 carbon steel at 80oC because SRA can utilize extracellular electrons for sulfate respiration just like SRB.(3)A nature-inspired anti-biofilm peptide at ppb (w/w) levels are found in lab tests to enhance a popular commercial biocide in treating a corrosive oilfield biofilm consortium on C1018 carbon steel.Many people mistakenly believe that biogenic H2S is the major contributing factor in sulfate reducing microbes (SRM) MIC on carbon steel. In this project, a nitrate reducing Pseudomonas aeruginosa biofilm that does not have H2S corrosion complication was evaluated for its corrosivity against carbon steel. It was found that P. aeruginosa grown as an NRB (nitrate reducing bacterium) was very corrosive against C1018 carbon steel because starved sessile cells switched from organic carbon to elemental iron as electron donor, thus causing more corrosion. A causal-relationship experiment was designed to prove a hypothesis that the Fe2+ acceleration of SRB MIC of carbon steel is primarily attributed to reduced H2S toxicity that leads to a higher sessile cell count, rather than an elevated [H2S] during incubation. A higher Fe2+ concentration in the culture medium can counter the toxic effects of H2S to promote SRB planktonic and sessile cell growth with increased dissolved [H2S]. A previous work demonstrated that lower [H2S] due to H2S escape to a larger headspace led to accelerated corrosion because of better sessile cell growth. In the two cases, [H2S] had opposite trends, suggesting that H2S was not the primary causal factor in the corrosion. In both cases, the increase of weight loss was due to increased electron uptake as evidenced by the increased sessile cell count in both cases. The combination of the headspace work with the Fe2+ work provides conclusive evidence that H2S is not the primary contributing factor in carbon steel MIC by SRB, thus solving a long-time mystery in SRB MIC of carbon steel.There are lots of data on MIC at mild temperatures such as 37oC. However, in a deep reservoir, much higher temperatures (e.g., 80oC) are encountered. Archaeoglobus fulgidus, a thermophilic SRA, was found to be corrosive against C1018 carbon steel at 80oC. It was also found that under different levels of carbon source starvation, the thermophilic SRA became more corrosive against carbon steel. This work proved that SRA also can utilize extracellular electrons for sulfate respiration just like SRB. This will inspire new research into the extracellular electron transfer (EET) mechanisms in archaea. In enhanced oil recovery (EOR), polymers are usually injected to increase the viscosity of injection water that is needed the push out viscous crude oil. EOR polymers, which are organic molecules, may be utilized by microbes as an organic carbon source. In this project, a commercial EOR polymer was degraded by an oilfield biofilm consortium (labeled as Consortium II) in an artificial seawater medium during a 30-day incubation period resulting in reduced viscosity by 34.5%. An efficient biocide treatment in the presence of EOR chemicals and other oilfield chemicals is desired. An equimolar D-amino acid mixture (D-mix) containing four different D-amino acids (D-tyrosine, D-methionine, D-leucine, and D-tryptophan) was tested to enhance tetrakis hydroxymethyl phosphonium sulfate (THPS) against Consortium II in the presence of EOR chemicals and other oilfield chemicals in this work. The combination of 100 ppm (w/w) THPS + 100 ppm (w/w) D-mix achieved further logarithmic reductions of sessile cell counts compared with the 100 ppm THPS alone treatment, thus further reduced carbon steel coupon weight loss and pitting corrosion. The test results suggest that D-amino acids are compatible with the other oilfield chemicals.Facing escalating biocide dosages, it is desirable to find biocide enhancers that make biocides more effective in biofilm treatment. Peptide A, a 14-mer cyclic peptide, was inspired by the anti-biofilm Equinatoxin II protein found in a sea anemone that exhibits biofilm-free exteriors. Peptide A at ppb levels was found to enhance 100 ppm THPS in treating biofilm Consortium II on C1018 carbon steel in an enriched artificial seawater medium. The enhanced biocide treatment reduced sessile cells on the carbon steel thus decreasing the coupon weight loss and pitting corrosion. Properly conducted electrochemical measurements such as linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS) and potentiodynamic sweep (PDS) can be used to support weight loss and pitting data and provide transient corrosion trends in MIC mechanistic studies and in biocide efficacy assessment. 2018 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541425677541433 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1541425677541433 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. |