The assessment of regeneration energy and water resource abundance in Dong-Sha Island

Project Duration	2004-12-31 ~ 2005-12-30
Research Title	The assessment of regeneration energy and water resource abundance in Dong-Sha Island
Contracted Organization	Taiwan Water Environment Regeneration Association
Principal Investigator	Yu Sheng-Chieh
Co-Principal Investigators	Ouyang Chiao-Hui, Chang Tien-Chin
Keywords	Surface water storage, solar power generation equipment, alternative energy, groundwater salinization
Abstract	Dongsha Island occupies a strategic position in the South China Sea and holds significant natural, cultural, economic, and strategic value. This project evaluated the current status and future development of energy and water resources on Dongsha Island, and assessed the feasibility of alternative energy implementation, energy-efficient building measures, water resource development, and optimized wastewater treatment and purification facilities. The study found that approximately 300 personnel are currently stationed on the island. Without constructing new buildings and under the condition that water and energy resources can meet tourism demand, the medium-term plan could allow 100 day-trip visitors (non-overnight) and 20 overnight visitors, while the long-term plan could accommodate 200 day-trip visitors and 40 overnight visitors. In terms of alternative energy development, the island could install five solar power systems with an average total output of 75 kW, seven solar water heaters, and four wind turbines with a combined capacity of 80 kW. In addition to renewable energy expansion, energy-saving measures should be implemented in existing buildings, lighting systems, and air-conditioning systems to improve overall energy efficiency. For water resource development, expansion of surface catchment areas and rooftop rainwater harvesting systems is recommended for irrigation and laundry use. Two seawater desalination units should be relocated to suitable sites to prevent sudden groundwater drawdown that could cause soil and groundwater salinization, while also doubling desalinated water production. Drinking water should be supplied at designated points to improve hygiene management. Recycling shower and wash water for use in retrofitted low-flush toilet systems could fully replace original flushing water and reduce chlorine concentrations in septic tank effluent, thereby improving treatment efficiency. Wastewater from the administrative area could first be treated in individual septic tanks, then conveyed by gravity flow and pumped to oxidation ditches. Effluent would undergo further treatment through constructed wetlands before discharge into the lagoon. Generated sludge could be processed through composting. This integrated approach aims to enhance resource sustainability while minimizing environmental impacts on Dongsha Island.