| Title | Tracing wastewater resources: Unravelling the circularity of waste using source, destination, and quality analysis |
|---|---|
| ID_Doc | 27798 |
| Authors | Renfrew, D; Vasilaki, V; Nika, E; Harris, E; Katsou, E |
| Title | Tracing wastewater resources: Unravelling the circularity of waste using source, destination, and quality analysis |
| Year | 2024 |
| Published | |
| Abstract | Current circularity assessment terminology restricts application to wastewater processes due to the focus on technical systems. Waste stream and wastewater discharge circularity definitions lead to paradoxical assessments that generate results of little value for evidence-based decision making. Therefore, a classification approach was developed to measure inflow and outflow circularity of the main wastewater resource flows using the principle of traceability, adopting the attitude that not all waste is created equally. Applying it to a wastewater treatment plant (12,000 m3/d load) showed how upstream agricultural, industrial, and human practices impact down-stream treatment, and the effectiveness of resource cycling within the natural environment. Industrial actions increasing fossil carbon concentration (400 m3/d effluent at 1000 mgC/l) reduced inflow and outflow circularity by 16 % and 10.6 % respectively, as secondary and sludge treatment fossil emissions increase significantly. Alternatively, changes to human and agricultural practices (50 % reduction of detergent and synthetic fertiliser usage) improved phosphorus inflow and nitrogen outflow circularity by 5.2 % and 20.1 % respectively. This approach can educate and assign responsibility to water users for developing robust circular economy policy, shifting the pattern from promoting circularity to discouraging linear actions, overcoming the shared economic and environmental burden of linear water use. |
| https://doi.org/10.1016/j.watres.2023.120901 |
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