The Specific Case Analysis of Biomineralization Induced by Sulfate Reducing Bacteria
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The effects of sulfate reducing bacteria (SRB) on the corrosion and scaling of the Q235 carbon steel hasbeen investigated in the simulated sewage water and oil field gathering pipelines production water, usingscanning electron microscopy (SEM), energy dispersive x-ray spectrometry (EDS), and three-dimensionalstereoscopic microscope. Results indicated that the concentration of SRB reached the maximum value onthe ninth day in simulated sewage water with a large amount of scaling on the surface of specimen. Inoil field gathering pipelines, a large amount of scaling and mineralization of mineral salts and thick depositionof extracellular polymeric substance (EPS) layers were also observed on the surface of specimen. The thicknessof biofilm was about 245 μm within 30 days. After adding microbicides, the thickness of corrosion productsfilm was only up to 48 - 106 μm within 30 days, suggesting that SRB could induce biomineralization. Under-deposit corrosion morphology was uniform in the absence of microbicides while local corrosion wasobserved in the presence of microbicides.
Abstract
The effects of sulfate reducing bacteria (SRB) on the corrosion and scaling of the Q235 carbon steel hasbeen investigated in the simulated sewage water and oil field gathering pipelines production water, usingscanning electron microscopy (SEM), energy dispersive x-ray spectrometry (EDS), and three-dimensionalstereoscopic microscope. Results indicated that the concentration of SRB reached the maximum value onthe ninth day in simulated sewage water with a large amount of scaling on the surface of specimen. Inoil field gathering pipelines, a large amount of scaling and mineralization of mineral salts and thick depositionof extracellular polymeric substance (EPS) layers were also observed on the surface of specimen. The thicknessof biofilm was about 245 μm within 30 days. After adding microbicides, the thickness of corrosion productsfilm was only up to 48 - 106 μm within 30 days, suggesting that SRB could induce biomineralization. Under-deposit corrosion morphology was uniform in the absence of microbicides while local corrosion wasobserved in the presence of microbicides.
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