Abstract:
Coffee husk and pulp are considered a waste material in most parts of the coffee processing
industry, during the time of dry and wet coffee processing a huge amount of coffee husk and
pulp are generated. These wastes are dumped into the water ways of the upper watersheds and
the environment without any treatment as a result; it becomes a severe treat to the aquatic
ecosystem and downstream water users. This problem can cause an impact on environment,
living organism and human health. So, coffee husk and pulp waste can be utilized as resource
materials through designing and operation of appropriate and effective waste utilization
technologies. Thus, there is an urgent need to solve these problem through innovative
technologies that integrate waste management and resource recovery. The objective of this study
was to produce fuel briquette from coffee husk and pulp as an innovative technology for
effective management of coffee processing waste by charring them in to a carbonized. The
coffee husk and pulp were collected from coffee plantation and processing industry located at
limmu kossa district of Jimma zone. An effective carbonize was used to carbonize the coffee
husk and pulp. From 100 kg of coffee husk and pulp it was possible to get 32.73±9.09 kg of
carbonized material. These carbonized materials were ground in to fine carbonized powder with
the surface temperature of the carbonize during carbonization an average ranged from 63.75 to
142.75 ºC for coffee husk and pulp. Then simple extruder machine was used to make fuel
briquette after mixing of this 2kg of powder with 1.5 kg cow dug binder with water at the ratio
of (2:1.5). The mixing time, the number of fuel briquette produced and the compression force
per minute of the extruder was dependent on the energy exerted by person who works on the
machine. average MC, VM, AC, FC of the fuel briquettes a ranged from 8.4 ± 3.24%, 15.00 ±
3.83%, 17.41 ± 4.63%, 59.95 ± 7.0 %, respectively. While an average BD, CV of the fuel
briquettes a ranged from, 151.23 ± 7.87% kg/m3, 19,212.95 ± 1621.601% KJ/Kg. apart from
this average TFE, Br and IT of the fuel briquettes a ranged from 84.63 ± 4.57%, 11.88 ± 1.25%
g/min, 41.63 ± 4.37% min, an experimental study and the laboratory analysis were conducted at
Jimma agricultural mechanization research center and central geological laboratory. Therefore,
enhancing the use of fuel briquette production by using coffee husk and pulp can reduce the
disposal problem of wastes in coffee processing and coffee plantation industry area.
