Abstract
Coal-fired power plants will emit several types of pollutants into the ambient air such as particulates and gases. One way to estimate the extent of the impact distribution of these pollutants is by using air quality modeling. The model used in this study is Calpuff, where this model is a non-steady state model and is influenced by variations in meteorological factors. The research location is PLTU Pangkalan Susu (2x200 MW) with SO2 and NO2 parameters. The purpose of this study was to calculate the concentrations of SO2 and NO2 with Calpuff, to validate modeling with field observations and to simulate the distribution of impacts. The results showed that the concentration of SO2 model obtained was 0.32 - 3.57 µg/m3 and NO2 was 0.51 - 5.15 µg/m3. Meanwhile, the observation results showed that the SO2 concentration was 27 - 39.88 µg/m3 and NO2 was 19.77 - 29.73 µg/m3. The simulation results of the distribution of SO2 and NO2 concentrations with the Calpuff model show that the impact distribution area is in the direction of the wind in the windrose and the affected area is in the southwest of the PLTU Pangkalan Susu. The results of model validation for the values of d = 0.97, r = 0.616 - 0.665 and FB = -1.719 - -1.849, which means that the Calpuff model is quite valid and can be applied to predict the impact distribution area at PLTU Pangkalan Susu.
Highlights
The existence of fossil fuel power plants, especially coal, will have an impact in the form of a decrease in ambient air quality
When viewed from the dominant wind direction, the areas that will be exposed to the impact of SO2 and NO2 emissions from the Pangkalan Susu PLTU are areas in the Southwest and BBD (Southwest Southwest)
The index of agreement (d) value obtained from Calpuff modeling at PLTU Pangkalan Susu is 0.972 or it can be interpreted that 97.2% of the data obtained is valid and 2.8% error
Summary
The existence of fossil fuel power plants, especially coal, will have an impact in the form of a decrease in ambient air quality. This occurs because of the specific emissions resulting from the coal-fired steam power plant (PLTU) process such as particulates, SO2, NOx, Opacity and Hg which enter the ambient air, affecting the function of the air (Pemerintah Republik Indonesia 1999). Emissions emitted from the PLTU chimney will be dispersed into the ambient air so it is necessary to estimate the concentration level of these pollutants. One way to estimate the ambient air concentration from a point source is by air quality modeling. The use of computer model simulations can be done at low cost and can perform calculations under various combined conditions (Khosro Ashrafi, Ali Ahmadi Orkomi 2017)
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