Millions of tons of waste are dumped every day around the world; most of it is dumped in landfills or released into rivers and seas without prior treatment. However, as demand for waste disposal capacity increases, the availability of suitable sites is decreasing. Waste has become a critical problem for industrial society, especially in large cities and densely populated areas. Therefore, the need to avoid or reduce waste and recycle it will become an extremely important political and economic issue. However, disposal capacities will continue to decline despite the reduction in the volumes of waste produced. This is why it is necessary to coordinate and optimize waste management. One of these options is cremation. Emissions from incinerators can be generalized into the following four categories: (1) particulate emissions; (2) gaseous emissions, such as sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO), and hydrochloric acid (HCl); (3) metals; and (4) various gas emissions. Emitted gases such as SO2, HCl, and NO2 contribute significantly to acid rain and smog, as well as the photochemical formation of ozone in smog exposed to sunlight. SO2, NO2 and ozone have been proven to cause respiratory illnesses, and smog leads to increased mortality rates [1]. Various technologies for eliminating SO2 present in combustion gases have been studied. Both dry and wet processes are commonly used. The dry process is superior to the wet process in terms of (1) low cost, (2) easy handling, and (3) no liquid waste. One of the processes in the dry process category is the bag filter reactor which uses Ca(OH)2 as an absorbent. However, this process has disadvantages, namely low sorbent conversion and low gas separation efficiency [2]. To improve gas efficiency...... middle of paper...... (calcination temperature = 800 °C) Figure 8 SEM micrographs of Ca(OH)2/DE sorbents: (a) DE and (b) Ca(OH)2/DE = 70:30. Figures 7 and 8 show that the total porosity of the Ca(OH)2 sorbent is lower than the total porosity of the Ca(OH)2 sorbent. Ca(OH)2/DE4 sorbent. ConclusionThe discussion of the results of this study can conclude that temperature, stirrer speed and reaction time have an important role on the reaction conversion between SiO2 and Ca(OH)2. The reaction temperature of 65°C produces the highest conversion, so it can be concluded that the reaction temperature is optimal at 65°C for the reaction between Ca(OH)2 and SiO2. The results also showed that the conversion reached a constant at the reaction time of 20 minutes. The absorption capacity of Ca(OH)2/DE sorbent on methylene blue is greater than the absorption capacity of Ca(OH)2 sorbent alone..