Abstract
Numerous acidic hot springs characterize to Lahendong geothermal field. Many of them for example, those occuring in the Pine Forest recreation area are utilized for bathing. This hot springs have a temperature for about 40 degrees of Celcius and pH value of less than 2. Besides being corrosive the acidic fluids also irritate human skin. This paper presents the preliminary results of our research aiming to reduce the acidity of the hot spring bath water in lahendong by utilizing Calcium Carbonate (limestone). The increment of pH of the water is calculated by using Runge-Kutta 4th order method and approached by continuous-stirred tank reaction using cylindrical tank. The trial using simulated trial errors and assumed variables. Simulation could be applied and adjusted to field conditions.First trial produces pH 2.5, it isobtained if the frequency factor value by 0.2. Second trial producespH 5with frequency factor value by 1.1. Thus, the greater the value of frequency factor, the faster the reaction will workand produce a largerpH.
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