DISPERSION SIMULATION OF GASEOUS HYDROGEN SULFIDE CONCENTRATIONS FROM THE GEOTHERMAL POWER PLANT ON GARUT AND TASIKMALAYA AREAS, WEST JAVA

• Main Author: Setiabudi, Alex
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/79600
• Institution: Institut Teknologi Bandung

Hydrogen sulfide (H2S) is a gaseous parameter that is classified as hazardous air pollutants (HAP) that will cause pollution and nuisance to occupational health, such as irritation or worst is death, when exposed at certain level of concentrations and period. One of H2S emission sources is the geothermal power plant, which is found in the non-condensable gas (NCG) that emitted from the stack or venting system of the geothermal power plant cooling tower. In this study, emission of H2S gas from the geothermal power plant of Pertamina Geothermal Energy (PGE) on Karaha Area is simulated to see its annual and seasonal dispersion patterns. The simulation is conducted in three scenarios of averaging time—1 hour, 8 hours, and 24 hours—and it’s conducted using the AERMOD model, the steady-state gaussian plume dispersion model. In the results with condition of percentile 99.99, the escalation of maximum concentration at 1 hour, 8 hours, and 24 hours of the averaging time 102.89 ppm, 25.47 ppm, dan 10.40 ppm. Those three scenarios have passed the standard level of odor, which is 0.02 ppm. The escalation occurred with the same coordinate location at 7°08'50.63"S – 108°05'02.61"E, which is inside the geothermal power plant activities. At the condition of percentile 90 at the same location, the maximum escalation with same average time are 1.39 ppm, 2.63 ppm, and 3.12 ppm. As well as the percentile 99.99’s condition, this condition has also exceeded the standard level of odor. These two conditions have also exceeded the exposure limit for workers to be exposed, which is 1 ppm with 8 hours exposure period. The incidence of exceeding standard odor levels that occur within a year at that point is predicted to reach 24.87%.