Search NASA⌕ Search
Home/Archive/NASA NTRS

NASA NTRS · 20040120658

Analysis of an algae-based CELSS. Part 2: options and weight analysis

Holtzapple, M. T.·Little, F. E.·Moses, W. M.·Patterson, C. O.
View original source ↗Export metadata ↓

Abstract

Life support components are evaluated for application to an idealized closed life support system which includes an algal reactor for food production. Weight-based trade studies are reported as "break-even" time for replacing food stores with a regenerative bioreactor. It is concluded that closure of the life support gases (oxygen recovery) depends on the carbon dioxide reduction chemistry and that an algae-based food production can provide an attractive alternative to re-supply for longer duration missions.

Explore related subjects

BioreactorsCarbon Dioxide/chemistrySpace Flight/instrumentationLife Support Systems/instrumentationEcological Systems, ClosedWaste Management/instrumentation/methodsFeasibility StudiesWater/chemistryModels, ChemicalCarbohydrates/chemistryComparative StudyAmmonia/chemical synthesisSupport, U.S. Gov't, Non-P.H.SEquipment DesignAlgae/metabolismNitrogen/chemistry

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Holtzapple, M. T., Little, F. E., Moses, W. M., Patterson, C. O.. 1989-04-01. Analysis of an algae-based CELSS. Part 2: options and weight analysis. https://ntrs.nasa.gov/citations/20040120658

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

NASA NTRS2014

Determination of Ammonia Oxidizing Bacteria and Nitrate Oxidizing Bacteria in Wastewater and Bioreactors

The process of water purification has many different physical, chemical, and biological processes. One part of the biological process is the task of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB). Both play critical roles in the treatment of wastewater by oxidizing toxic compounds. The broad term is nitrification, a naturally occurring process that is carried out by AOB and NOB by using oxidation to convert ammonia to nitrite and nitrite to nitrate. To monitor this biological activity, bacterial staining was performed on wastewater contained in inoculum tanks and biofilm samples from bioreactors. Using microscopy and qPCR, the purpose of this experiment was to determine if the population of AOB and NOB in wastewater and membrane bioreactors changed depending on temperature and hibernation conditions to determine the optimal parameters for AOB/NOB culture to effectively clean wastewater.

Bioreactors↗
NASA NTRS2002

Continuous pH monitoring in a perfused bioreactor system using an optical pH sensor

Monitoring and regulating the pH of the solution in a bioprocess is one of the key steps in the success of bioreactor operation. An in-line optical pH sensor, based on the optical absorption properties of phenol red present in the medium, was developed and tested in this work for use in NASA space bioreactors based on a rotating wall-perfused vessel system supporting a baby hamster kidney (BHK-21) cell culture. The sensor was tested over three 30-day and one 124-day cell runs. The pH sensor initially was calibrated and then used during the entire cell culture interval. The pH reported by the sensor was compared to that measured by a fiber optically coupled Shimadzu spectrophotometer and a blood gas analyzer. The maximum standard error of prediction for all the four cell runs for development pH sensor against BGA was +/-0.06 pH unit and for the fiber optically coupled Shimadzu spectrophotometer against the blood gas analyzer was +/-0.05 pH unit. The pH sensor system performed well without need of recalibration for 124 days. Copyright 2002 Wiley Periodicals, Inc.

Bioreactors↗