Abstract
Biodiesel come into being used as an alternative source of energy as the diminishing of petroleum reserves. This fuel is typically stored in tanks that are commonly made from carbon steel, which is easily corroded by microorganisms. Recent studies have shown that bacteria aside from SRB may also be involved in corrosion. Therefore, this research was aimed to evaluate the effect of biodiesel concentration (15%, 20% and 30% v/v) mixed in diesel oil on the corrosion of carbon steel by S. marcescens that dominate biocorrosion on hydrocarbon products. In this study, the corrosion process was investigated by evaluation of biofilm morphology and composition, the rate of corrosion and the corrosion product of carbon steel which was exposed in the mixture of hydrocarbons and the presence of S. marcescens. It can be concluded that higher concentration of biodiesel in diesel oil leads to higher growth of bacteria in the biofilm and higher corrosion rate.
Highlights
In response to the petroleum crisis, the existence of biofuels as alternative energy sources are necessary to anticipate the depletion of petroleum fuels
This research consisted of three main stages namely preparation, experimental and corrosion analysis to observed biocorrosion characteristics of carbon steel ST37 in a mixture of 15%, 20% and 30% v/v biodiesel produced from laboratory and diesel oil from Pertamina containing S. marcescens ATCC 27117
By counting the number of bacterial colonies in the biofilm that are formed on the metal surface using total plate count (TPC) analysis, bacterial growth in a biofilm can be observed to determine the ability of S. marcescens to live in biofilms
Summary
In response to the petroleum crisis, the existence of biofuels as alternative energy sources are necessary to anticipate the depletion of petroleum fuels. Indonesia has natural resources that can be potentially exploited for the production and exported biofuels as biodiesel. In this case, biodiesel can be produced from palm oil, soybeans, and jatropha curcas. Biodiesel can be produced from palm oil, soybeans, and jatropha curcas They are commonly planted and have potential to be developed in Indonesia. Due to the increasing demand for diesel oil in the transportation and industrial sectors, correspondingly, the biodiesel mixed with diesel fuel in Indonesia continues to be investigated. The Indonesian government through Permen ESDM No 12 2015 expects the use of biodiesel as a mixture of up to 30% of total fuel demand, which can be achieved by 2025
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