EFFECT OF INHIBITORS AS BIOCORROSION CONTROL IN BIODIESEL STORAGE SYSTEM

• Main Author: Defrianto
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/84468
• Institution: Institut Teknologi Bandung

Biodiesel is an alternative fuel composed of fatty acid methyl esters (FAME) produced through the transesterification process of vegetable oil or animal fat. Using biodiesel blends in diesel fuel can reduce harmful exhaust emissions. However, biodiesel has its drawbacks such as low storage stability and hygroscopic properties. These properties create a suitable environment for microorganisms to grow, leading to biocorrosion on metal and decreased fuel quality. One method to prevent biocorrosion is using corrosion inhibitors, such as essential oils which have antimicrobial properties and are relatively non-toxic to the environment. This study examines essential oil application on the formation of Pseudomonas sp. biofilm, ST-37 carbon steel corrosion, and B35 fuel quality in a biodiesel storage tank system. This research shows that adding essential oil at a concentration of 5000 ppm can reduce the corrosion rate of carbon steel. In contrast, adding 500 ppm glutaraldehyde increases carbon steel's corrosion rate. Biofilm growth and pitting corrosion were observed to be significantly reduced by the addition of clove bud oils and eucalyptus oil. In contrast, adding glutaraldehyde caused almost an absence of biofilm on carbon steel surfaces. Biofilm and EPS produced by Pseudomonas sp. are composed of polysaccharide compounds, proteins, ketone compounds, carboxylic acids, and alcohol. Pseudomonas sp. activity is known to cause an increase in B35 acid numbers, and the addition of essential oils is thought to promote further acid production. Different results were produced when adding glutaraldehyde, where there was no significant increase in the B35 acid number. Pseudomonas activity is known to reduce iron into corrosion products in the form of hematite, goethite, and vivianite.