The Effect of Spent Coffee Grounds in Increasing the Calorific Value of Waste Paper Briquettes
Dianta Mustofa Kamal1,a), Iwan Susanto2, Fuad Zainuri2, Tatun H. Nufus3, Galuh Inez Maulidya3, Putu Wijaya Sunu4

1Master^s Program in Applied Manufacturing Technology, State Polytechnic of Jakarta, Jl. Prof. Dr. G. A. Siwabessy, Kampus UI Depok 16425, Indonesia
2Heavy Equipment Study Program, State Polytechnic of Jakarta, Jl. Prof. Dr. G. A. Siwabessy, Kampus UI Depok 16425, Indonesia
3Power Plant Study Program, State Polytechnic of Jakarta, Jl. Prof. Dr. G. A. Siwabessy, Kampus UI Depok16425, Indonesia
4Mechanical Engineering Department, State Polytechnic of Bali, Jl. Kampus, Kuta Selatan, Badung Bali 80364, Indonesia
a) Corresponding author: dianta[at]pnj.ac.id

Abstract

Briquettes produced from scrap paper are known for their low calorific value. The calorific value of briquettes from waste paper is in fourth rank after waste wood, charcoal and sawdust. Therefore, the correct ratio of composition mixture to create 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 high calorific value and easily found. The purpose of the study is to find the correct ratio that may increase the calorific value of the biobriquettes made of scrap paper, based on proximate 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% of 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 the 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.

Keywords: Biomass, Briquette characterization, Proximate Analysis

Topic: Renewable energy