Organic waste management: utilization and biocycling systems
2003
Markus Bieri(International Centre of Insect Physiology and Ecology, Addis Abeba (Ethiopia). Swiss Federal Institute of Technology, Zurich (Switzerland))
The chapter deals with strategies and selected technologies of integrated waste management schemes. Waste is separated at source and yields organic waste as well as inorganic residues that can be supplied directly to recycling industries. In Addis Ababa, about 60% of the waste is organic material. If uncontaminated with toxic substances, this waste can be used as raw material for products such as energy and fertilizers. Decentralized management schemes reduce collection and transport costs and enable city dwellers and farmers to use or market the products. New technologies permit on-site processing and yield useful and marketable products. The technologies should be adapted local conditions and combined in integrated waste management schemes. Sludge from biogas digesters and ashes from incinerators, as well as urine, bones, horns, claws and feathers, can be converted into useful organic fertilizers. Wastewater can be biologically treated in ponds occupied by water plants. The cleaned water may serve for irrigation purposes, while the water plants can be used as animal feed and an energy and plant nutrient source.
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