Reverse osmosis and ultrafiltration of stillage solubles from dry-milled corn fractions |
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Authors: | Y V Wu K R Sexson |
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Affiliation: | (1) U.S. Department of Agriculture, Northern Regional Research Center, Agricultural Research Service, 1815 North University St., 61604 Peoria, IL |
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Abstract: | Grits, flour, degerminated meal and hominy feed from corn were fermented to make ethyl alcohol. The stillage, remaining after
distillation of alcohol, was separated by screening and centrifuging into insoluble and soluble fractions. The stillage solubles
contained 0.036 to 0.080% nitrogen and 1.4 to 7.2% total solids. Ultrafiltration (UF) membranes separated stillage solubles
into permeate and concentrate fractions. Permeates from stillage solubles accounted for 85 to 95% of the original volume,
44 to 67% of the total solids and 40 to 75% of the total nitrogen. Reverse osmosis (RO) membranes separated the UF permeate
into RO permeate and RO concentrate fractions. The RO permeate accounted for 70 to 92% of the original volume, 5 to 15% of
the total solids and 5 to 21% of the total nitrogen in the UF permeate. Conductivity of some RO permeate fractions was lower
than that of tap water. The combination of UF and RO processing of stillage solubles from corn dry-milled fractions appears
to be an attractive method to recover most of the solids and nitrogen in small volumes of concentrate, and produces a final
permeate with a low concentration of solids and nitrogen. The RO permeate may be reused as water, treated further or discharged.
Presented at the AOCS Annual Meeting, May 1984, Dallas, Texas.
Deceased. |
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