Ethanol Co-Product Could Make Fertilizer

DomesticFuel.com
Posted by Cindy Zimmerman – August 25th, 2009

The leftovers from an ethanol co-product could be used as a fertilizer, according to research being done at South Dakota State University.

When the ethanol by-product known as dried distillers grains with solubles (DDGS) is heated at high temperatures under limited oxygen to make synthesis gas, or syngas, the remains are a fine, dust-like ash. SDSU Soil Testing Laboratory manager Ron Gelderman set out to learn whether that residue could be applied to fields as a soil nutrient, since the ash likely would be discarded in a landfill otherwise.

An SDSU greenhouse study found that dried distillers grain ash resulted in about the same increase in corn growth as fertilizer phosphorus. Use of dried distillers grain ash as a source of potassium in that study was inconclusive, since the selected soil supplied adequate plant potassium.

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