Bioaktivitas Ekstrak Makroalga Sargassum sp. dan Gracilaria sp. terhadap Korosi Mikrobial T. Ferrooxidans

Abstract

Microbial corrosion is corrosion caused by microbial growth. This type of corrosion can affect and accelerate the process of corrosion due to the presence of microbes. Underwater pipes are one material that is often overgrown with bacteria that cause corrosion. Corrosion due to microbial activity can cause leaks underwater pipes that can pollute the environment and other marine biota. These microbes grow and settle on the pipe for a long time and cause pipe solidification. One microbe that can cause microbial corrosion is an aerobic bacterium that plays an active role in the microbial corrosion process, namely the bacterium Thiobacillus. This type of bacteria is capable of producing corrosive acidic environmental conditions resulting from the oxidation of sulfur to sulfuric acid. In this study determined the corrosion inhibition rate and optimum macroalgae dose used to obtain optimal inhibition results. Methanol extract of Gracilaria sp. and Sargassum sp. were able to inhibit the growth of T. ferooxidans at doses of 300µL and 400µL in 10 ml of media. LC50 value of Sargassum sp. Extract. is 483 µL while for Gracilaria sp. is 461 µL in 25 ml of media.

Bacterial communities of Iradiator Gamma Karet Alam (IRKA) pool water

“…The results of chemical-physical measurements of IRKA pool water showed the potential to support bacterial growth (table 1). The pH parameter of 7.42 is still within the pH range that supports bacterial growth, which is 2-9 [18]. The dissolved oxygen parameter, which is more than the IAEA standard, is thought to be one of the causes of the presence of bacterial communities in the IRKA pool water.…”