| Summary: | 碩士 === 國立中央大學 === 國際永續發展碩士在職專班 === 102 === The Conaree Landfill site located in the island of Saint Christopher (St. Kitts or Saint Kitts) has been operating for over 50 years. Before 2002, the burial site was a garbage dump site until it was renovated into a sanitary landfill by the government. The site now is managed by the Solid Waste Management Corporation (SWMC) which is a government owned entity, and receives approximately 700-800 tonnes of solid waste weekly which are all of the collected amount of the island’s solid waste. Conaree landfill site has 12.8 hectares with 4.2 hectares dedicated to solid waste disposal. Total disposal capacity of the landfill is 153,000 cubic metres. In 2012, it had reached full capacity in solid waste burial.
The purposes of this study for Conaree Landfill in site mining and reclamation are to recover the landfill space, obtain the environmental benefits, and recover the valuable materials in the buried solid waste. In the results of this study for above purposes, it found that the site for waste bury can increase as much as 9,866 m3. About the recovery of valuable materials, in an attempt to quantify the cost and benefits while performing the landfill mining and reclamation (LFMR) project in St. Kitts. This study applied a method to estimate the amount of solid waste in the landfill. According to the estimation, it showed that the total waste in the landfill was 364,270 tonnes. Plastics were deemed to be not economic to be recovered for sale in the market, but that instead used as fuel in a waste to energy facility could have a considerable value. Furthermore, the total recycling cost (metals only) amounted to $177,801, while the revenue from the sale of metals amounted to $108,970. The mining cost amounted to $1,010,000. About the recycled plastic waste, because there is no market value in the nation, the waste may be sent to the incinerator which is planning to be built to increase the calorific value.
One of the possible benefit in the environment is to reduce the amount of methane (CH4) and carbon dioxide (CO2) gases from the landfill. However, since the organic waste excavated will still be buried back to the landfill site after mining, the methane and CO2 gas emissions cannot be avoided. Therefore, this study did not involve the mentioned emissions avoided benefit. In an environmental perspective, the performance of this landfill mining and reclamation programme can provide lots of environmental benefits including the removal of hazardous solid wastes from the landfill site for proper treatment, retrofit of qualified liners and gas-emission collection system to control release of leachate, gases, and odors, etc. Due to various constraints, this study is now to estimate these benefits with difficulty, but in the long-term it sure can exceed the measurable amount of monetary terms.
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