Document Detail

The effect of drying and size reduction pretreatments on recovery of inorganic crop nutrients from inedible wheat residues.
MedLine Citation:
PMID:  14631996     Owner:  NASA     Status:  MEDLINE    
Inorganic 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.
R F Strayer; M P Alazraki; J Judkins
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Habitation (Elmsford, N.Y.)     Volume:  9     ISSN:  1542-9660     ISO Abbreviation:  Habitation (Elmsford)     Publication Date:  2003  
Date Detail:
Created Date:  2003-11-22     Completed Date:  2004-01-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101192457     Medline TA:  Habitation (Elmsford)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1-8     Citation Subset:  S    
Dynamac Corporation, Controlled Biological Systems, Kennedy Space Center, FL 32899, USA.
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MeSH Terms
Desiccation / methods*
Ecological Systems, Closed
Freeze Drying
Life Support Systems
Minerals / analysis,  chemistry*
Particle Size
Triticum / chemistry*
Waste Management / methods*
Reg. No./Substance:
0/Minerals; 0/Nitrates; 7439-95-4/Magnesium; 7440-09-7/Potassium; 7440-70-2/Calcium; 7723-14-0/Phosphorus
R F Strayer / NASA KSC

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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