NASA Exploration Toilet On-orbit Results and Impact on Future Missions



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2023 International Conference on Environmental Systems


The Universal Waste Management System (UWMS), which has the ISS operational nomenclature “Toilet”, was initially installed on the International Space Station (ISS) in 2020 with final installation completed in 2021. Technical progress continued to be made with each on-orbit operation that culminated in additional crew use of the UWMS on ISS. Additional problems were evaluated during troubleshooting and testing with the UWMS hardware using water and pretreat to simulate crew use. This paper summarizes the additional testing, troubleshooting and the results as well as characterizes the additional data obtained and summarizes the interpretation of the data to characterize the hardware’s operational nuances. Use of the hardware by crew is planned and will also be summarized. The paper will also describe the additional portions of the technology demonstration that were completed and the benefits that inform the Orion-installed UWMS unit and future manifesting of consumables for both Orion and ISS.


Melissa McKinley, NASA Johnson Space Center(JSC), USA
Melissa Borrego, NASA Johnson Space Center(JSC), USA
Kelly DeRees, NASA Johnson Space Center(JSC), USA
Jill Williamson, NASA Marshall Spaceflight Center, USA
Cory Kaufman, Collins Aerospace, USA
ICES304: Physio-Chemical Life Support- Waste Management Systems- Technology and Process Development
The 52nd International Conference on Environmental Systems was held in Calgary, Canada, on 16 July 2023 through 20 July 2023.


waste management, toilet, environmental controls, human spaceflight