Influence of Hydrocarbon Concentration in Produced Water on Biofilm Formation and Corrosion of Carbon Steel by Bacillus megaterium

• Main Author: Aslan nim : 13014041, Eric Hansel nim : 13014076, Christian
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26252
• Institution: Institut Teknologi Bandung

Produced water is the largest wastewater in the oil and gas well. Its high toxicity and high salinity are major concerns, as high toxicity causes environment damage, while high salinity causes corrosion in produced water piping and storage system. The material used for produced water transportation pipe system is usually carbon steel, because carbon steel is more inexpensive, easy to fabricate, and have good mechanical properties. However, carbon steel is vulnerable against corrosion. Corrosion can be caused or accelerated by microorganisms and this kind of corrosion is called biocorrosion or Microbially Influenced Corrosion (MIC). MIC can occur because microorganisms can use hydrocarbons from the produced water as a nutrition source to produce biofilm on a metal surface. <br /> <br /> <br /> <br /> <br /> The aim of this research is to determine the effect of environmental conditions on the corrosion of carbon steel caused by Bacillus megaterium immersed in artificially produced water. The hydrocarbons concentration variation are 60 mg/L, 565 mg/L and natural produced water (2 mg/L). Coupons of carbon steel are immersed inside the reactor with artificially produced water with working volume 200 mL for 21 days. This research showed that the corrosion in the medium with 60 mg/L of hydrocarbon exhibited the highest corrosion rate while the medium with 565 mg/L of hydrocarbon exhibited the lowest corrosion rate. The corrosion rate of carbon steel in the medium with Bacillus megaterium was lower than the corrosion rate in the medium without microbes. FTIR analysis showed that the composition of biofilm are proteins, lipids, and carbohydrates. XRD also detected Fe3O4 as the main corrosion product. EIS and SEM detected the layer system of carbon steel immersed in produced water system were solution, biofilm, corrosion product, and carbon steel. <br />