The effect of spent coffee grounds in increasing the calorific value of waste paper briquettes.

Briquettes produced from scrap paper are known for their low calorific value. The calorific value of briquettes from waste paper is in the fourth rank after waste wood, charcoal, and sawdust. Therefore, the correct ratio of composition mixture to create a higher calorific value is required. Spent Coffee Ground (SCG) has been selected as an added material in the composition of biomass mixture since SCG has a high calorific value and is easily found. The purpose of the study is to find the correct ratio that may increase the calorific value of the bio-briquettes made of scrap paper, based on comparative testing and analysis. There are four composition mixture samples used in the study. The first composition mixture is 90% of scrap paper and 10% adhesive; the second one is 70% of scrap paper, 20% of SCG, and 10% adhesive; the third composition mixture is 50% of scrap paper, 40% of SCG, 10% of adhesive; and the fourth composition mixture includes 30% of scrap paper, 60% of SCG and 10% of adhesive. The study shows that the greater ratio of SCG used in the composition will result in a higher calorific value. The research concludes that briquettes achieve their best performances in the composition mixture of 40% of SCG. In the proposed ratio, briquettes are not brittle and produce 5.366 kcal/kg of calorific value; 6.58% of water content; 5.37% of ash content; 28.28% of volatile matter; and 8.91% of shatter index. Therefore, the studied composition can be considered to produce the most efficient biomass briquettes made from scrap paper [ABSTRACT FROM AUTHOR]