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Authors = Poornima A. Jayasinghe

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16 pages, 1378 KiB  
Review
Interdependencies between Urban Transport, Water, and Solid Waste Infrastructure Systems
by Poornima A. Jayasinghe, Sybil Derrible and Lina Kattan
Infrastructures 2023, 8(4), 76; https://doi.org/10.3390/infrastructures8040076 - 12 Apr 2023
Cited by 12 | Viewed by 12166
Abstract
Developing integrated, sustainable, and resilient urban systems requires consideration of the different types of interdependencies between their infrastructure systems. The degree and nature of interdependencies among infrastructure systems vary widely. This article identifies and analyzes the interdependencies between urban transport, water, and solid [...] Read more.
Developing integrated, sustainable, and resilient urban systems requires consideration of the different types of interdependencies between their infrastructure systems. The degree and nature of interdependencies among infrastructure systems vary widely. This article identifies and analyzes the interdependencies between urban transport, water, and solid waste. A comprehensive review is conducted, an interdependency matrix for the three systems is developed, and the interdependencies are analyzed qualitatively. The analysis shows that the three systems are highly interdependent, indicating that an integrated approach that considers the mutual impacts, conflicts, and interactions among them at all stages of their life cycles is necessary to promote sustainability and resilience. This article also identifies opportunities for developing new integrated planning and design approaches and emphasizes the need for further research in this area to quantify infrastructure interdependencies. This is particularly important in the context of rapid urbanization and the pressure on cities to adapt to climate change. Full article
(This article belongs to the Section Sustainable Infrastructures)
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16 pages, 3779 KiB  
Article
Impact of Landfill Gas Exposure on Vegetation in Engineered Landfill Biocover Systems Implemented to Minimize Fugitive Methane Emissions from Landfills
by Dinu S. Attalage, J. Patrick A. Hettiaratchi, Angus Chu, Dinesh Pokhrel and Poornima A. Jayasinghe
Int. J. Environ. Res. Public Health 2023, 20(5), 4448; https://doi.org/10.3390/ijerph20054448 - 2 Mar 2023
Cited by 2 | Viewed by 2025
Abstract
Engineered landfill biocovers (LBCs) minimize the escape of methane into the atmosphere through biological oxidation. Vegetation plays a crucial role in LBCs and can suffer from hypoxia caused by the displacement of root-zone oxygen due to landfill gas and competition for oxygen with [...] Read more.
Engineered landfill biocovers (LBCs) minimize the escape of methane into the atmosphere through biological oxidation. Vegetation plays a crucial role in LBCs and can suffer from hypoxia caused by the displacement of root-zone oxygen due to landfill gas and competition for oxygen with methanotrophic bacteria. To investigate the impact of methane gas on vegetation growth, we conducted an outdoor experiment using eight vegetated flow-through columns filled with a 45 cm mixture of 70% topsoil and 30% compost, planted with three types of vegetation: native grass blend, Japanese millet, and alfalfa. The experiment included three control columns and five columns exposed to methane, as loading rates gradually increased from 75 to 845 gCH4/m2/d over a period of 65 days. At the highest flux, we observed a reduction of 51%, 31%, and 19% in plant height, and 35%, 25%, and 17% in root length in native grass, Japanese millet, and alfalfa, respectively. The column gas profiles indicated that oxygen concentrations were below the levels required for healthy plant growth, which explains the stunted growth observed in the plants used in this experiment. Overall, the experimental results demonstrate that methane gas has a significant impact on the growth of vegetation used in LBCs. Full article
(This article belongs to the Special Issue Sustainable Waste Management to Mitigate Global Climate Change)
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14 pages, 1083 KiB  
Review
The Impact of COVID-19 on Waste Infrastructure: Lessons Learned and Opportunities for a Sustainable Future
by Poornima A. Jayasinghe, Hamoun Jalilzadeh and Patrick Hettiaratchi
Int. J. Environ. Res. Public Health 2023, 20(5), 4310; https://doi.org/10.3390/ijerph20054310 - 28 Feb 2023
Cited by 22 | Viewed by 3145
Abstract
The onset of the COVID-19 pandemic posed many global challenges, mainly in the healthcare sector; however, the impacts on other vital sectors cannot be overlooked. The waste sector was one of the significantly impacted sectors during the pandemic, as it dramatically changed the [...] Read more.
The onset of the COVID-19 pandemic posed many global challenges, mainly in the healthcare sector; however, the impacts on other vital sectors cannot be overlooked. The waste sector was one of the significantly impacted sectors during the pandemic, as it dramatically changed the dynamics of waste generation. Inadequate waste management practices during COVID-19 shed light on the opportunities for developing systematic, sustainable, and resilient waste infrastructure in the future. This study aimed to exploit the learnings of COVID-19 to identify any potential opportunities in post-pandemic waste infrastructure. A comprehensive review on existing case studies was conducted to understand the waste generation dynamics and the waste management strategies during COVID-19. Infectious medical waste from healthcare facilities had the largest influx of waste compared with non-medical waste from residential and other sectors. This study then identified five key opportunities from a long-term operational perspective: considering healthcare waste sector as a critical area of focus; encouraging the integration and decentralization of waste management facilities; developing systematic and novel approaches and tools for quantifying waste; shifting towards a circular economy approach; and modernizing policies to improve the effectiveness of the post-pandemic waste management infrastructure. Full article
(This article belongs to the Special Issue Sustainable Waste Management to Mitigate Global Climate Change)
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