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Investigation of microbiologically influenced corrosion (MIC) and biocide treatment in anaerobic salt water and development of a mechanistic MIC model.

机译：研究厌氧盐水中微生物影响的腐蚀（MIC）和杀菌剂处理方法，并建立机械MIC模型。

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Pipelines during and after hydrotesting are vulnerable to microbiologically influenced corrosion (MIC), which can result in severe pinhole leaks. Instead of the current MIC studies in the field practice, this study investigated the MIC phenomenon in hydrotesting under laboratory conditions, and a variety of issues that arose during this process are discussed.;The MIC process during hydrotesting was found to be dependent on water sources due to different concentrations of nutrients and native organisms. In order to accelerate the MIC process, a simulated worst-case scenario with a lab strain SRB (sulfate-reducing bacteria) and key nutrients added proved to be a useful approach. Furthermore, the technique of polymerase chain reaction (PCR) was adopted to MIC research for detecting very low concentrations of targeted planktonic microbes.;A novel MIC mitigation method, using biocides THPS (TetrakisHydroxymethyl-Phosphonium Sulfate) and glutaraldehyde, in combination with EDTA (Ethylene-DiamineTetraAcetic acid) was found to be more effective for controlling the growth of planktonic SRB. A mechanistic THPS degradation model, with great consistency to experimental results, was developed to predict residual THPS concentration to assure that it does not fall below the desired minimum required for MIC control.;Based on the mechanism of biocatalytic cathodic sulfate reduction (BCSR), a first generation MIC mechanistic model was developed to predict the localized MIC pitting rate under certain conditions; thus providing a basis for a more comprehensive mechanistic MIC modeling. Futhermore, a new biomarker EPS (extracellular polymeric substances), a potential replacement of existing biofilm probes, was proposed to serve for locating biofilms.
机译：水压测试期间和之后的管道很容易受到微生物影响的腐蚀（MIC），这可能导致严重的针孔泄漏。代替当前在现场实践中进行的MIC研究，本研究调查了实验室条件下水压测试中的MIC现象，并讨论了此过程中出现的各种问题。;发现水压测试中的MIC过程取决于水源由于养分和天然生物的浓度不同。为了加速MIC过程，使用实验室菌株SRB（减少硫酸盐的细菌）和添加关键营养素来模拟最坏情况是一种有用的方法。此外，聚合酶链反应（PCR）技术被用于MIC研究中，以检测极低浓度的目标浮游微生物。;一种新的MIC缓解方法，使用杀生物剂THPS（四羟甲基甲基膦酸硫酸盐）和戊二醛与EDTA（EDTA）结合使用发现乙二胺四乙酸对于控制浮游SRB的生长更为有效。建立了与实验结果高度一致的机械THPS降解模型，以预测残余THPS浓度，以确保其不低于MIC控制所需的期望最小值。;基于生物催化硫酸盐还原（BCSR）的机理，建立了第一代MIC机理模型，以预测某些条件下的局部MIC点蚀率。从而为更全面的机械MIC建模提供基础。此外，提出了一种新的生物标志物EPS（细胞外聚合物质），它是现有生物膜探针的潜在替代品，可用于定位生物膜。

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