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Integrated biological treatment and biogas production in a small-scale slaughterhouse in rural Ghana.

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<mark>Journal publication date</mark>11/2006
<mark>Journal</mark>Water Environment Research
Issue number12
Volume78
Number of pages5
Pages (from-to)2335-2339
Publication statusPublished
Original languageEnglish

Abstract

A small-scale anaerobic slaughter waste treatment plant in rural Ghana was tested for the production of energy and a microbiologically clean effluent suitable for use in irrigation. A typical day's slaughter, comprising 4 cattle, 12 sheep, and 12 goats, produced 8.5 m3 of biogas. Annually, this is equivalent to the energy from 17 metric tons of fuel wood, which is the annual productivity of 2 ha of savanna vegetation. Fecal indicator bacteria were reduced by 2 to 3 logs, nitrates by 86 to 90%, phosphates by 23%, biochemical oxygen demand by 42 to 92%, and suspended solids and dissolved solids by 73 to 86% and 19 to 37%, respectively. The effluent is used for irrigation, and the organic biomass from the digester is used as a biofertilizer. Besides energy and a cleaner effluent, the community benefited from a lessening dependency on fuel wood and reductions in unpleasant smells and nuisance animals, such as flies, dogs, and vultures.