| Summary: | 碩士 === 國立臺北大學 === 自然資源與環境管理研究所在職專班 === 107 === Recently, the recycling economy initiative emphasizing "sustainable resource recovery and recycling" has emerged in Taiwan, among which "converting waste into renewable resources" is the most feasible and practical. In this study, the life cycle of eggshell was assessed from a circular economy and cradle-to-cradle perspective. According to the 2018 agricultural statistics annual report of the Council of Agriculture of the Executive Yuan, the production of eggs is about 7.3 billion, and the waste eggshell is about 46,000 tons. From the perspective of the circular economy, collecting eggshells for recycling can not only reduce the amount of waste to avoid environmental pollution but also increase economic benefits. If waste eggshells are developed into powder after calcining in a sintering furnace, they can be used as raw materials for other products to create circular economic benefits.
The eggshell life cycle defined in this study includes waste, recycling, transportation, production, and selling. That is to say, eggshell starts from consumption, goes through recycling, transportation, and production such as cleaning, drying, calcination, grinding, and powdering, and finally comes to sales. The results showed that about 600 grams of eggshell powder could be produced per 1kg of eggshell as raw material for the life cycle of another new product, such as health food, facial mask, maintenance products, and so forth. This study also attempted to construct a "Dashboard of Eggshell Life Cycle Sustainability", to distinguish 12 indicators for environmental, economic and social aspects, and to evaluate the social life cycle of eggshells. In addition to energy consumption and carbon dioxide emissions, the assessment found that the environmental, economic, and social benefits per capita of eggshell recycling were significant. This study not only discusses and verifies the feasibility of extending the life cycle of eggshell waste, but also builds a simplified life cycle assessment framework for eggshell waste, hoping to reverse the impact of eggshell on the current environment and become a "cradle-to-cradle" circular economy model, and further compares the benefits of direct eggshell waste and recycling. This is to explore the environmental, economic, and social benefits of eggshell recycling in terms of life cycle assessment.
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