Biological treatment of combined ink and starch wastewater for use in corrugator adhesive preparation
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United States of America Patent
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Jun 29, 1993
Grant Date -
N/A
app pub date -
Apr 15, 1992
filing date -
Apr 15, 1992
priority date (Note) -
Expired
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Abstract
The invention is process for biologically treating ink/starch waste-water which is typically produced from the process of making paper and cardboard products. Waste-water that contains naturally occurring facultative anaerobic bacteria is placed into a first tank so that the first tank and the mixture is stirred until a pH of between about 4 to about 6 is reached. The mixture is transferred into a second tank so that the second tank and aerobic bacteria is added to the mixture in the second tank, wherein the second tank has an aeration blower so as to make oxygen available to the aerobic bacteria. The mixture is held in the second tank until the mixture reaches aerobic equilibrium with a pH between about 7 and about 8. After reaching this equilibrium, the wastewater can be used in up to 100% makeup to prepare high quality corrugating adhesive of consistent paramenters for viscosity and gelatinization temperature.
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