Author(s) - Nyaanga D.M, Mbuba M. Jesca, Kabok P. Aguko*, Reinilde Eppinga

 DOI: - 10.23958/isroj/vol03-i01/03


Faecal matter and sawdust can be considered as an expensive liability in the environment but have a huge potential for fuel briquettes that can replace firewood and charcoal as major sources of energy in rural and peri-urban households in Kenya. The research evaluated the effect of the faecal matter - sawdust mix ratio and binder on the performance of the composite briquette as a source of energy in selected cook stoves. The raw materials were dried, carbonised, reduced in size, mixed and agglomerated using mix ratios (of carbonised faecal matter to sawdust) of 1:0, 3:1, 1:1,1:3, 0:1 and bonded with a binder at 10% of total mass. Molasses and boiled faecal matter were selected as binders. The briquettes were evaluated in a 500g cook stove (“Jikokoa”) using standard water boiling tests of ignition time, burning rate, specific fuel consumption and power output. The performance characteristics varied with the type of binder, proportion of raw materials used and combustion phase. Molasses compared to faecal matter bonded briquettes burned faster and took less time to boil water. Ignition time and burning rate increased with increase of faecal matter in the briquettes while specific fuel consumption, power output and burning rate decreased with decrease of faecal matter. Average specific fuel consumption and power output of molasses bonded briquettes ranged from 95-119 g/l and 2048- 2404 watts while for faecal matter bonded briquettes ranged from 98-120 g/l and 2071-2417 watts during the high-power phase, respectively.

Keywords: - Spherical-Shaped briquettes, Faecal Matter, Sawdust, Ratios, Binders, Performance.