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The influence of feed automatization on pH-fluctuations in urine processing trickling filters

Holbeck, Ilse Marie and Waßer, Kai and Paulke, Tim Niklas and Hauslage, Jens and Bornemann, Gerhild (2022) The influence of feed automatization on pH-fluctuations in urine processing trickling filters. COSPAR 2022 44th Scientific Assembly, 2022-07-16 - 2022-07-24, Athen, Griechenland.

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Abstract

With respect to crewed long-term space missions, closed-loop systems for resource management become increasingly important. Processing human wastes into plant-available nitrogen sources is a crucial part of ensuring food supply in space. This study describes a 90-day experiment in which trickling filters fitted with 6 L of lava rock (16-25 mm grain size), mussel shells as buffer material and a 28 L tank were fed with synthetic urine (SU) and observed with regard to their nitrogen conversion rates and pH stability. The filters were operated semi-continuously with a daily withdrawal of 500 mL processed SU and addition of 500 mL new SU. The processed urine was removed from the system with only one withdrawal for all filters. The addition was done at intervals that differed between the filters: the first filter triplet received 500 mL SU once a day, the second filter triplet received ten times 50 mL and the third filter triplet received 108 times 4.6 mL. Nitrogen conversion rates, measured as nitrate production/day, did not differ significantly between the filters. However, the pH fluctuations were reduced by the divided addition (\Delta pHminmax [triplet 1] \geq 1; \Delta pHminmax [triplet 2] \geq 0.7; for triplet 3 the measurement has not yet been completed; pHmeanmin [triplet 1] \sim pHmeanmin [triplet 2] \sim 3.8; pHmeanmax [triplet 1] \sim 5; pHmeanmax [triplet 2] \sim 4.5). We hypothesize that pH fluctuations with lower maximum values reduce the precipitation in the tank induced by the mussel shells. The measurements are ongoing.

Item URL in elib:https://elib.dlr.de/189643/
Document Type:Conference or Workshop Item (Speech)
Title:The influence of feed automatization on pH-fluctuations in urine processing trickling filters
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Holbeck, Ilse MarieGerman Aerospace Center (DLR), Institute of Aerospace Medicine, Gravitational Biology, CologneUNSPECIFIEDUNSPECIFIED
Waßer, KaiGerman Aerospace Centre (DLR), Institute of Aerospace Medicine, Gravitational Biology, Cologne, GermanyUNSPECIFIEDUNSPECIFIED
Paulke, Tim NiklasGerman Aerospace Centre (DLR), Institute of Aerospace Medicine, Gravitational Biology, Cologne, GermanyUNSPECIFIEDUNSPECIFIED
Hauslage, JensGerman Aerospace Centre (DLR), Institute of Aerospace Medicine, Gravitational Biology, Cologne, Germanyehttps://orcid.org/0000-0003-2184-7000UNSPECIFIED
Bornemann, GerhildGerman Aerospace Center (DLR), Institute of Aerospace Medicine, Gravitational Biology, Cologne, GermanyUNSPECIFIEDUNSPECIFIED
Date:July 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:trickling filter, BRLSS, SPS automatization, C.R.O.P., urine,
Event Title:COSPAR 2022 44th Scientific Assembly
Event Location:Athen, Griechenland
Event Type:international Conference
Event Start Date:16 July 2022
Event End Date:24 July 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Project C.R.O.P.(R) (:envihab - Live Support Systems IV)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Gravitational Biology
Deposited By: Chiodo, Annette
Deposited On:09 Nov 2022 11:54
Last Modified:24 Apr 2024 20:50

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