Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1996-08-20
1998-08-25
Lithgow, Thomas M.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210714, 210732, 210734, 210928, C02F 124, C02F 156
Patent
active
057980462
ABSTRACT:
The present invention provides a method for removing secondary fiber contaminants from paper mill process waters comprising adding a polyvinyl chloride, a cationic polymeric coagulant and a polymeric flocculant to paper mill process waters containing secondary fiber contaminants in an amount sufficient to agglomerate the secondary fiber contaminants to larger particles sizes, and removing the secondary fiber contaminants from the process water by a dissolved air flotation clarification technique. The addition of particulate polyvinyl chloride in combination with a polymeric coagulant and flocculant prior to the DAF clarification process causes the contaminants to become preferentially coated with the polyvinyl chloride particles. This coating is what causes the subsequent removal of the secondary fiber contaminants in the DAF clarification process to be more effective.
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Capozzi Ann M.
Greer Carol S.
Wilkins Linda S.
Breininger Thomas M.
Brumm Margaret M.
Lithgow Thomas M.
Nalco Chemical Company
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