Phosphate-containing fertilizer derived from steepwater
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United States of America Patent
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Issued Date -
Jun 9, 2005
app pub date -
Nov 9, 2004
filing date -
Jan 24, 2003
priority date (Note) -
Abandoned
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Abstract
This invention relates to fertilizer compositions containing phosphorus that is derived from steepwater, e.g., corn steepwater, and methods of making fertilizer from steepwater. In one implementation, steepwater is mixed with an alkaline metal hydroxide, which is added in an amount effective to precipitate at least about 75% of the phosphorus in the steepwater. A phosphorus-rich precipitate is separated from the steepwater; the precipitate includes an organic phosphorous component and an inorganic phosphorous component, which may include a phosphorous salt of the metal. At least a majority of the organic phosphorus component may be converted to inorganic phosphorous, improving its bioavailability to growing plants.
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Cited Art Landscape
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