The performance of biogas combustion after carbon dioxide absorption using sodium hydroxide (NaOH)

Abstract

The improvement of biogas calorific value is required before distributed to users. The improvement of the calorific value can be done by carbon dioxide removal. This study was aimed to investigate the efficiency of biogas combustion after carbon dioxide removal by the absorption using sodium hydroxide (NaOH). In this study, we used 4 types of sodium hydroxide based on its concentration: 5, 15, 25 and 35% i.e N1, N2, N3, and N4 respectively. The absorption using N1, N2, N3, and N4 decreased carbon dioxide content with the increasing concentration of NaOH. The decrease in carbon dioxide content also led to the increase in biogas combustion that represented by calorific value. of biogas. The calorific value after the absorption using N1, N2, N3, and N4 were 10711.73 + 33.98; 1999.53 + 9.93; 1253.43 + 28.43; and 1328.13 + 8.98 kJ respectively. The results also showed that the absorption can increase the water heating value boiled with biogas. The water heating value after absorption using N1, N2, N3, N4 were 187.91 + 10; 225.42 + 1.77; 227.91 + 8.47; and 243.82 + 1.92 respectively. The best performance in combustion is biogas after carbon dioxide absorption using 35% NaOH.