Assessment of Tannery Solid Waste Management and Characterization A Case of Ethio-Leather Industry Private Limited Company (EliCO)
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Date
2012-11
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Addis Ababauniversity
Abstract
Tanning industry generates large quantities of solid wastes during leather manufacturing process and subsequently during effluent treatment. From this point of view, in this study assessment on solid waste management practices and physicochemical characterization of the solid wastes generated from tannery were made at Ethio-Leather Industry Private Limited Company (ELICO) so that to propose appropriate tannery solid waste management options. The assessment made showed that the types of tannery solid wastes are de-dusted salt, raw skin trimmings, hair, fleshings, splitting waste, pickle trimmings, chrome shaving, crust trimmings, finished leather trimmings and sludge. Determination of the solid waste generation rates using material balance analysis techniques shows that in processing 7,251 ton of cattle hide and sheep skins annually, the tannery generates a total of 4048.96 tonne of
solid waste from beamhouse, tanning, re-tanning, finishing processes and effluent treatment plant. It was found that 859kg of solid waste is generated during processing one tonne of wet salted hide. Similarly, 262kg of solid waste is generated during processing the same amount of sheep skins. It was observed that beamhouse operations have more than 60% contributions
in generating the solid wastes. The solid wastes were characterized for pH, moisture content, volatile organic compound, ash content, calorific value, carbon content, total nitrogen content, carbon to nitrogen ratio, chromium content, sodium content and calcium content using standard solid waste analysis methods and the experimental result reveals that more than 90% of the solid wastes are organic. In order to propose solid waste management options for tannery solid waste, solid waste management strategies (source reduction, recycling and composting, waste transformation/waste to energy and landfilling) were reviewed and two basic thermo-chemical waste to energy technological options (incineration and pyrolysis/gasification), biochemical conversion process (Anaerobic digestion/biomethanation)
and composting were found to be viable to manage tannery solid waste and
proposed based on the physico-chemical characteristics of the solid waste
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Private Limited Company Elico