Filtering by
- All Subjects: Nitrogen
- Creators: School of Sustainability
- Member of: Theses and Dissertations
- Resource Type: Text
Plastic pollution is undoubtedly one of the most pressing challenges facing humanity today. Significant action is required in order to properly address this rapidly growing threat. The Circular Economy provides a promising model for solution design in terms of responsible consumption and production. Countdown: Circular Economy Solutions is an organization created by Jasmine Amoako-Agyei focused on addressing the threat of plastic pollution in the United States and Ghana, West Africa. The first part of this report will explain the severity of the global plastic pollution crisis and challenges with recycling. It will then present the Circular Economy as a viable model for a course of action. From there it will explain the efforts of Countdown: Circular Economy Solutions over the last two with a pathway forward. This venture leveraged the greater ASU ecosystem of resources such as Walton Sustainability Solutions, Precious Plastic ASU, the Luminosity Lab, Changemaker Central, Venture Devils, Engineering Projects in Community Service (ASU), Gary K. Herberger Young Scholars Academy, KNUST, and Ashesi D: Lab.
This formula was used to estimate the nutrient uptake performance of aquatic primary producers from sampling observations; ANPP accounted for 16.26 metric tons of system wide N uptake, while aquatic ER contributed 6.07 metric tons N of nighttime remineralization and 5.7 metric tons of N throughout the water column during the day. The estimated yearly net aquatic N flux is 4.49 metric tons uptake, compared to about 12 metric tons yearly N uptake by the vegetated marsh (Treese, 2019). However, not accounting for animal respiration results in an underestimation of system-wide N remineralization, and not accounting for soil processes results in an underestimation of N uptake.
The rise in urban populations is encouraging cities to pursue sustainable water treatment services implementing constructed treatment wetlands (CTW). This is especially important in arid climates where water resources are scarce; however, research regarding aridland CTWs is limited. The Tres Rios CTW in Phoenix, Arizona, USA, presents the tradeoff between greater water loss and enhanced nitrogen (N) removal. Previous research has suggested that water loss due to transpiration is replaced by a phenomenon termed the Biological Tide. This trend has been documented since 2011 by combining transpiration values with a nitrogen budget. Calculations were made at both the marsh and whole-system scale. The purpose of this paper is to demonstrate how the Biological Tide enhances N uptake throughout the CTW. Results indicate that about half of the nitrogen taken up by the vegetated marsh is associated with new water entering the marsh via the Biological Tide with even higher values during warmer months. Furthermore, it is this phenomenon that enhances N uptake throughout the year, on average, by 25.9% for nitrite, 9.54% for nitrate, and 4.84% for ammonium at the whole-system scale and 95.5%, 147%, and 118% within the marsh. This paper demonstrates the Biological Tide’s significant impact on enhanced N removal in an aridland CTW.