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This study aimed to determine blending options for Roselle-Tung biodiesel and estimate the difference in the environmental impacts of vegetable oil-based biodiesel and its blends compare to petroleum diesel when discharging into Ha Long Bay.
Coastal area plays various roles for human life as food supplier, recreation area, and biodiversity. Its roles are very important from the environmental, economic, and social aspects. However, most of the coastal area surrounded by big cities is landfilled for industrial use or as a final site our garbage goes to. It provides us economic growth, however, it causes serious problems such as eutrophication,...
The aim of this paper is to propose multi-purpose DOW utilization systems with enough capacity of ocean thermal energy conversion (OTEC), which can cover the total power of an isolated island as a renewable infrastructure, and to evaluate their economic feasibility and environmental impact focusing on reduction effect of carbon dioxide. Hateruma Island in Okinawa Prefecture, Japan was decided as a...
In this paper, authors have focused on safety and uniformity as the basis of utilization system for digestive sludge from marine biomass. At first, when marine biomass is used as materials of methane fermentation, safety and uniformity problems of digestive sludge are investigated. Furthermore, in order to solve the problem, a method of extracting useful materials is examined experimentally.
According to Situation Report on pollution of coastal areas in Vietnam, surface waters and coastal sediments in Ha Long Bay have high oil-pollution level as much as eighteen times higher than Vietnamese standard limits. The development of economic society, especially the rapid growth of the tourism industry and shipping in recent years, has led to dramatically increase the tourist boats which are...
In this study, we propose a marine biomass utilization system and describe anaerobic digestion system using marine biomass and food waste. Anaerobic digestion system includes collecting biomass, anaerobic digestion, and growing vegetables. Four scenarios are presented varying the amount and the suppliers of biomass. We apply life cycle exergy analysis, which combine life cycle assessment and exergy...
In the enclosed sea area, a large amount of organic matters deposited in seabed sediment because rich nutrient through the river cause the massive generation of phytoplankton and seaweeds. As the result, hydrogen sulfide is eluted from the organic-rich sediment and stimulates the additional hypertrophic effect. However, there is an incomplete understanding of a mineralization process from sediment...
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