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Tanjung Jati B Unit 3 & 4 Steam Power Plant (PLTU) is a steam power plant that uses coal as fuel. Burning coal produces exhaust emissions containing sulfur dioxide (SO2) which is dangerous for the environment. To overcome this, PLTU Tanjung Jati B Units 3 & 4 uses Flue Gas Desulphurization (FGD) to reduce SO2 emissions. This research aims to analyze the factors that cause FGD failure in reducing SO2 emissions, formulate efforts to overcome FGD failure and improve its performance, and develop a method for evaluating the effectiveness of FGD in reducing SO2 emissions. The research method used is literature study, primary data collection through observation and interviews, and data analysis. The research results show that the factors that cause FGD to fail in reducing SO2 emissions are blockage of the spray pipe and header pipe, blockage of the tray, and a decrease in the performance of the booster fan and absorber recirculation pump. The method for evaluating the effectiveness of FGD in reducing SO2 emissions is by analyzing de-Sox efficiency, flue gas flowrate and temperature, pressure drop, and ARP discharge pressure. Keywords: PLTU, FGD, SO2 emissions, de-Sox efficiency, flue gas flow rate, pressure drop, ARP discharge pressure. The method for evaluating the effectiveness of FGD in reducing SO2 emissions is by analyzing de-Sox efficiency, flue gas flowrate and temperature, pressure drop, and ARP discharge pressure.

The study aimed to investigate the alkaloid content in cinnamon (Cinnamomum burmannii) powder using the Soxhlet extraction method. Alkaloids are organic chemical compounds widely found in nature as secondary metabolites in both plants and animals. They possess a cyclic structure containing one or more basic nitrogen atoms, conferring unique basic properties. The research was conducted to provide a deeper understanding of the potential utilization of plant-derived alkaloids, particularly from cinnamon, in drug development. The study sought to determine the color of the precipitate formed in the extraction solution after the addition of Mayer's reagent and to investigate the effect of the number of Soxhlet extraction cycles on the color of the ethanol used in the research with cinnamon samples. The findings from this study contribute to the exploration of the alkaloid content in cinnamon and its potential applications in pharmaceutical development.

This study aims: to describe the composition and behavior of exhaust gases of motorized vehicles that can have an impact on human health. Based on the results of a theoretical study of various information that the main pollutants in motor vehicle exhaust gases are carbon monoxide (CO), hindrocarbon compounds, nitrogen oxides (NOx) and sulfur (SOx), and dust particulates including lead (PB). Chemical reactions in the atmosphere sometimes take place in a long and complex reaction chain, and produce an end product that can be more active or weaker than the original compound. Motor vehicle exhaust gases which have an impact on health are classified as follows; (1). Pollutants which mainly interfere with the respiratory tract. Included in this group are sulfur oxides, particulates, nitrogen oxides, ozone and other oxides, (2). Pollutants that cause systemic poisons, such as monoxide and lead / lead hydrocarbons, (3). Pollutants suspected of causing cancer such as hydrocarbons, (4). Conditions that interfere with comfort such as noise, street dust, etc. So the conclusion is that in anticipating the negative impacts caused by motor vehicle exhaust gases, the role of the government in setting several regulations and policies in the environmental field is needed, where every business or activity is prohibited from violating the quality standards and standard criteria of environmental damage set by government.