Optimization of Nutrient Supplement In Hydrocarbon Bioremediation Process with Biostimulation Techniques in Coastal Regions

Bioremediation is the application of the principles of biological processes to cultivate the land, and clay which are contaminated by dangerous chemicals. By adding nutrient, it is known as biostimulation. Biostimulation needs nutrient addition to stimulate microbial growth. Bioremediation's success often measured by contaminants concentration reduction percentages in soil or ground water. From this results, the additional nutrient's optimum value obtained with a ratio of N: P at 107.63: 1, with the amount of nutrients (% P) of 8.471 and a decrease in oil concentration coefficient (k) 0,033 / day. Meanwhile, in the experiment with additional nutrients as much as 8.47% P at a ratio of N: P = 105.5: 1, while the percentage of bioremediation obtained approximately 88.47%. The output value of the regression analysis of R-Sq (adj) = 82.2%, this indicates that the expected response of high significance. The research was conducted in the pond area of District Kalang Anyar Sedati Sidoarjo, implemented from May to August 2014 (11).