Thermodynamic feasibility of shipboard conversion of marine plastics to blue diesel for self-powered ocean cleanup
Collecting and removing ocean plastics can mitigate their environmental impacts; however, ocean cleanup will be a complex and energy-intensive operation that has not been fully evaluated. This work examines the thermodynamic feasibility and subsequent implications of hydrothermally converting this w...
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| Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2021-11, Vol.118 (46), p.1-8 |
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| container_title | Proceedings of the National Academy of Sciences - PNAS |
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| creator | Belden, Elizabeth R. Kazantzis, Nikolaos K. Reddy, Christopher M. Kite-Powell, Hauke Timko, Michael T. Italiani, Eduardo Herschbach, Dudley R. |
| description | Collecting and removing ocean plastics can mitigate their environmental impacts; however, ocean cleanup will be a complex and energy-intensive operation that has not been fully evaluated. This work examines the thermodynamic feasibility and subsequent implications of hydrothermally converting this waste into a fuel to enable self-powered cleanup. A comprehensive probabilistic exergy analysis demonstrates that hydrothermal liquefaction has potential to generate sufficient energy to power both the process and the ship performing the cleanup. Self-powered cleanup reduces the number of roundtrips to port of a waste-laden ship, eliminating the need for fossil fuel use for most plastic concentrations. Several cleanup scenarios are modeled for the Great Pacific Garbage Patch (GPGP), corresponding to 230 t to 11,500 t of plastic removed yearly; the range corresponds to uncertainty in the surface concentration of plastics in the GPGP. Estimated cleanup times depends mainly on the number of booms that can be deployed in the GPGP without sacrificing collection efficiency. Self-powered cleanup may be a viable approach for removal of plastics from the ocean, and gaps in our understanding of GPGP characteristics should be addressed to reduce uncertainty. |
| doi_str_mv | 10.1073/pnas.2107250118 |
| format | Article |
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| source | Jstor Complete Legacy; MEDLINE; PubMed Central; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry |
| subjects | Diesel fuels Environmental impact Environmental Monitoring - methods Exergy Feasibility Feasibility Studies Fossil fuels Garbage Liquefaction Marine pollution Oceans and Seas Physical Sciences Plastic pollution Plastics Plastics - chemistry Thermodynamics Uncertainty Waste Products - analysis |
| title | Thermodynamic feasibility of shipboard conversion of marine plastics to blue diesel for self-powered ocean cleanup |
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