| dc.description.abstract | This study was aimed at characterizing and estimating the resource recovery potential of organic solid waste generated at markets in Kampala Central Division using the Resource Value Mapping (REVAMP) tool. The recoverable resource products highlighted in this study are bio-gas, compost, black soldier fly larvae, and solid fuel. These are obtained from treatment methods which include anaerobic digestion to form bio-gas and anaerobic digestion residue, drying and densification to produce solid fuel, black soldier fly processing to produce black soldier fly larvae, and composting to produce compost. The objectives of this study were to estimate the organic fraction of the solid waste collected from the markets, to determine the physical and chemical characteristics of the organic waste collected in the markets, and to estimate the resource recovery potential of the organic waste stream collected using the REVAMP tool.
The REVAMP tool is a tool designed on the basis on material flow analysis, to give estimates of the resources than can be generated from organic waste i.e. faecal sludge, sewage sludge, and organic municipal solid waste. This tool was used to analyze data obtained in this research, and the results were only estimated for only organic municipal solid waste. Calculation of the resource recovery potential was done in three steps. First, the quantity of the organic solid waste to be calculated was entered and apportioned to the different resource recovery options in percentages. Then, the waste quality of the waste as obtained from physical and chemical tests done in the laboratory was entered into the tool, as well as the treatment processes of the organic waste to produce the highlighted recoverable products. The prices of the resource recovery products were then entered, and finally the value of the products that can be recovered from the organic solid waste were calculated. The tool then produces results in categories of potential revenue, nutrient content, and energy content.
The results from this study showed that the highest potential revenue from the organic solid waste collected from markets was from anaerobic digestion, with a total sum of US$ 3623.426 from all the three markets, followed by solid fuel (US$ 3257.289), then black soldier fly larvae (US$ 2232.744), and finally composting (US$ 370.182). Solid fuel is shown to have the highest energy content potential (16.0MJ), while potassium is shown to have the highest nutrient potential from the three markets being 0.0729 tons per day.
The results from the study therefore highlight the need for implementation of resource recovery as an option for solid waste management. The potential of the recoverable products can not only be of financial value to the people of Uganda, but can also be an alternative to the degrading solid waste management process like dumping in landfills. Studies should be done to estimate how to maximize the potential of these recoverable products through better sanitation processes like separation of wastes at collection, construction of designated solid waste collection points in the markets, and the construction of structures to aid in the treatment processes. | en_US |
