Thesis & Dissertation
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University of Moratuwa Theses and Dissertations by University of Moratuwa, Sri Lanka is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
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Browsing Thesis & Dissertation by Subject "3R CONCEPT"
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- item: Thesis-AbstractEnhancing the solid waste management practices of export processing zones of Sri Lanka(2023) Abhayapala, ONRP; Dissanayake, PSolid waste management is a critical concern in the modern world due to the compilation of solid waste, which cannot be easily recycled or managed. Furthermore, this issue has been continuously affecting most of the countries which are having Export Processing Zones (EPZ). Similarly, EPZs in Sri Lanka zones are making a considerable impact on the incensement of solid waste. Due to the unavailability of the proper solid waste management system, social economic and environmental issues have aroused. Hence this research aimed to develop strategies for enhancing solid waste management practices in Export Processing Zones in Sri Lanka on the identification of better solid waste management practices in EPZs Sri Lanka. A qualitative research method was followed to achieve the aim of the study According to the interview guideline, 12 interviewees participated representing 3 case study EPZs in Sri Lanka. The primary data was collected through interviews the evaluated using manual content analysis. The research finds current solid waste management practises in the global context have different varieties however in Sri Lankan contracts are limited to segregation open dumping end minimum level of recycling and reusing process. Furthermore, in most cases, open dumping is used for hazardous solid waste generated in export processing zones. In the Sri Lankan context incineration is widely used as a solid waste management process at its primary level. However, financial capabilities limited motivation, unavailability of national policy, political influence, and limited awareness of the public and management cause barriers to the solid waste management process. The research suggested that finding the stakeholders and providing specific responsibilities with a focus on producing solid waste generation, developing national policy, continuous monitoring, providing financial incentives, generating independent management authority, and increasing public awareness through different campaigns will support the solid waste management process in an improved version. Even though solid waste management is limited to export processing zones, it is essential to concern this aspect in a wide view to ensure the social economy and Environmental Protection of the country. The research findings on solid waste management in EPZs concerning successful methods used in a global context propose guidelines for better practices. Furthermore, the development of the legal systems and long-term policies are key findings of the research to enhance the socio-environmental and economic best practices in Sri Lanka. Keywords: Solid waste management, Export processing zones, Sri Lanka, Incineration, 3R concept
- item: Thesis-AbstractSteel portal frame design for deconstruction and reuse(2022) Surendra KI; Hettiarchchi MT PToday, the world over, much emphasis is focused on the use of sustainable materials in infrastructure. One of the main attributes that has led to the widespread use of steel in infrastructure is that is considered sustainable. Steel meets the 3R concept of Sustainability, Reduce, Reuse and Recycle. While steel components are 100% recyclable, the manufacture of stronger and better quality steel products has enabled the design and construction of structures using reduced quantities of steel. Due to scarcity of raw material, conservation of energy coupled with escalation of steel prices, it is prudent to design steel structures that can be re-used, thus extending the life cycle of steel. This is an aspect that has hitherto not received sufficient consideration by structural engineers. The focus of this thesis is on extending the life cycle of steel components, with particular emphasis on the design of single span steel portal framed structures by considering the aspects of deconstruction and re-use. The scope of the study was limited to a span range of 20m to 40m and eaves heights of 4m and 6m and typical vertical action of 10kN/m. The adoption of haunches hinders the re-use of the rafter. An innovation recently adopted facilitating the re-use of rafters is that of replacing the haunch at the eaves with a steel knee brace pinned at either end to the column and rafter. This concept was investigated and found to be viable within this range of span and eaves heights. Optimum locations for knee brace connections were found to be 10% of span length at the rafter end and 3% of the span length from the rafter axis at the column end. These initial studies indicate that greater attention should be paid on the aspect of deconstruction and re-use of steel at the preliminary stages of design in order to extend the life cycle of steel components and thereby enhance the sustainability of steel structures.