Model Matematika Persebaran Polutan dari Cerobong Kilang Pertamina RU V Balikpapan

  • Muliady Faisal Program Studi Matematika, Jurusan Matematika dan Teknologi Informasi, Institut Teknologi Kalimantan, Balikpapan, Indonesia

Keywords

Gaussian Plume, ; Air Pollution Dispersion, Laplace Transform, Atmospheric Stability, Refinery Emissions

Abstract

Air pollution from industrial stacks is a major environmental concern in Balikpapan, where the Pertamina Refinery Unit V (RU V) is one of the largest refineries outside Java. This study derives the Gaussian plume model from the steady-state advection–diffusion equation using the Laplace transform and applies it to three RU V stacks (CDU IV, HVU II, and HCU) to estimate ground-level concentrations of particulate matter, SO2, and NO2. Stack parameters and measured emission concentrations were obtained from the refinery, and 2021 wind records from the Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG). A mean daily-maximum wind speed of 3.7 m/s and moderate insolation indicated Pasquill–Gifford stability classes B and C. Concentrations were calculated using Briggs buoyant plume rise and rural dispersion coefficients, and compared with the US EPA SCREEN3-based software ScreenView. Maximum ground-level concentrations occurred 990–1,630 m downwind under class B and 1,670–2,970 m under class C. The highest single-stack values were 0.42 µg/m3 for particulate matter, 16.38 µg/m3 for SO2, and 20.15 µg/m3 for NO2. ScreenView gave maxima 4–11% lower and located 11–20% farther downwind, which is explained by differences in wind speed at stack height, plume rise, and dispersion coefficients. Superposition of the three plumes produced combined maxima of 26.5 µg/m3 for SO2 and 46.2 µg/m3 for NO2, well below the one-hour ambient standards of Government Regulation No. 22 of 2021 (150 and 200 µg/m3). The study offers a transparent analytical framework for screening-level assessment of refinery emissions; field validation remains necessary.

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2026-10-05