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.
Geothermal hot spring can be used as source of hot bath. It contains mineral elements such as Cl−, K+, Na+, and SO4
2−. One of geothermal hot springs in Leilem, Sulawesi Utara, is categorized as Acid Sulfate Water. Leilem geothermal hot spring contains high acid sulfate and causing the pH level reach to 1. Leilem hot bath is categorized into acidic type. In order to reach mildly acidic type, the pH level should be up to 4. The method research to increase the pH level is to flow the hot water to the stack of CaCO3. To design the system, the reaction rate constant should be known. These constants are assumed to follow the Arrhenius’ equation, k = A e^((-Ea
)/RT).The value of frequency factor (A) and activation energy (Ea
) are collected through a laboratory scale experiment of H2SO4 with CaCO3 (powder) by using variant variables of the temperature of water and the mass of CaCO3. Based on the result of the experiment the value of A is 1.8 and Ea
18.515 J(gmol)−1 and the research successfully increases the pH up to 4 or even higher.
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