Pollution of crude oil on environmental can have an effect of nutrient uptake on plants and balance of ecosystems. Biodegradation. is one way to reduce petroleum pollution . The purpose of this research are determine the potential growth of actinomycetes local Riau (L11 and L121) in crude oil hydrocarbons at concentrations of 0%, 2%, 5% and to know their ability to degrade crude oil hydrocarbons at concentrations of 5%. This research observed the growth of each actinomycetes local Riau and the percentage of crude oil degradation by a single isolate and a consortium with gravimetric method. The results showed that the growth of L11 and L121 total population was not significantly different at addition crude oil of 2% and 5% but significantly different wth 0% (without crude oil). Test degradation of crude oil using single isolate gave significantly different results for the consortium isolates. Percentage of degradation crude oil by L11 was 23.5%, L121 was 19.2% and consortium isolate (L11 + L121) was 31.9% with an incubation time of 10 days in a minimum medium salts. This actinomycetes local Riau can be developed as biodegradation agents for crude oil on soil and water.
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