Accession Number : AD0700735

Title :   DESIGN AND PRELIMINARY EVALUATION OF A MAN-RATED PHOTOSYNTHETIC EXCHANGER.

Descriptive Note : Interim rept. Mar 67-Jun 68,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s) : Miller,Richard L. ; Rose,George W. , III ; Kilian,Herman J. ; Wickline,Hazel E. ; Martinez,Cara L.

Report Date : OCT 1969

Pagination or Media Count : 23

Abstract : Algal photosynthesis may be used to provide part of man's expendable needs for life support in long-duration space missions. Feasibility has been demonstrated in model experiments, but the extrapolation of laboratory data to the design of prototype life support systems can only be made within wide limits. The USAF School of Aerospace Medicine has developed a large-scale algal photosynthetic exchanger to study the logistics of operation of a man-rated system. The hardware consists of a closed-loop continuous algal propagator using artificial illumination. Unicellular algae are cultured in aqueous inorganic media, contacted with cabin gas, and exposed to fluorescent light in thin layers. Inputs to the process are carbon dioxide, fresh culture medium, and light energy. The products are oxygen and raw foodstuff in the form of algal harvest. The apparatus is instrumented to monitor and control the important parameters affecting algal growth. Culture density is automatically controlled by a photodiode densitometer which regulates the addition of fresh medium and the harvest of culture. System performance has been tested using three different species of algae. (Author)

Descriptors :   (*LIFE SUPPORT, ALGAE), (*CLOSED ECOLOGICAL SYSTEMS, PHOTOSYNTHESIS), DESIGN, CARBON DIOXIDE, OXYGEN, CULTURE MEDIA, BIOSYNTHESIS, GROWTH(PHYSIOLOGY), LIGHT

Subject Categories : Anatomy and Physiology
      Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE