NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The effect of drying and size reduction pretreatments on recovery of inorganic crop nutrients from inedible wheat residuesInorganic nutrients can be easily recovered from ALS crop residue solid wastes by aqueous leaching. However, oven drying and milling pretreatment of these residues has been frequently required to accommodate crop scientists and facility storage limitations. As part of a research study that will compare three different bioreactor technologies for processing these wastes, we realized that different drying and size-reduction pretreatments had been utilized for each technology. This paper compares the effects of residue pretreatment on recovery of nutrients by leaching. Pretreatments included three drying methods [fresh, oven-dried (70 degrees C overnight), and freeze-dried] and two size reduction methods [chopped (2 cm length) and milled (2 mm diameter)]. Determination of mass balances (dry weight and ash content of solids) before and after leaching indicated solubilization was least for fresh residues (23% dry weight loss and 50% for ash loss), and most for freeze-dried residues (41-47% dry weight loss and nearly 100% for ash loss). Mineral recovery of major elements (NO3, PO4, K, Ca, and Mg) in leachates was poorest for fresh residues. P and K recovery in leachates were best for oven-dried residues and Ca, Mg, and N recovery best for freeze-dried residues. The differences in recovery for N, P, and K in leachates were minimal between chopping and milling and slightly better for Ca and Mg from milled residues.
Document ID
20040087474
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Strayer, R. F.
(NASA Kennedy Space Center Cocoa Beach FL United States)
Alazraki, M. P.
Judkins, J.
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Habitation (Elmsford, N.Y.)
Volume: 9
Issue: 2-Jan
ISSN: 1542-9660
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: NAS9-98126
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center KSC
NASA Discipline Life Support Systems

Available Downloads

There are no available downloads for this record.
No Preview Available