Process for treating wool scouring wastes
AssigneeGeo. W. Bollman & Co., Inc.
InventorWillis A. Heisey
Life of this patent
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Abstract
An improved process for treating wool scouring wastes liquors in which the waste liquors are first cooled before acid and collodial bentonite are added; then the flocculated liquor is reheated to a temperature in the range of 130.degree. to 150.degree. to separate the waste liquor into a supernatent liquor and a settled drainable sludge and finally dewatering the settled sludge by centrifugal separation.
Claims2
An improved process for treating wool scouring waste liquors having an initial COD in excess of 20,000 ppm, including the steps of cooling the waste liquor to a temperature in the range of 80.degree. to 90.degree. F after discharge from a scouring bowl at a temperature in the range of 130.degree. to 150.degree. F, adding acid and collodial bentonite to said cooled waste liquor, maintaining a pH range of 3.5 to 3.9 and bentonite at a weight to volume ratio in the range 0.10 to 0.3%, adding lime to adjust the pH range to 5.8 to 6.3 and flocculating the waste liquor, the improvement comprising the steps of heating the flocculated waste liquor to a temperature in the range of 130.degree. to 150.degree. F, separating the waste liquor into a supernatent liquor and a settled non-drainable grease containing sludge, and dewatering the settled grease containing sludge by centrifugal separation.
An improved process for treating wool scouring waste liquors, comprising the steps of cooling the waste liquor having an initial COD in excess of 20,000 ppm to a temperature of approximately 90.degree. F after discharge from a scouring bowl at approximately 130.degree. to 150.degree. F, adding acid and collodial bentonite to the cooled liquor while maintaining a pH of approximately 3.9 and bentonite weight to volume ratio in the range of 0.15 to 0.3%, adding lime to neutralize the liquor maintaining a pH range of 5.8 to 6.3 and flocculating, reheating the flocculated waste liquor to a temperature in the range 130.degree. to 150.degree., producing a supernatent liquor and a settled non-drainable grease containing sludge and dewatering the settled grease containing sludge by centrifugal separation.
Dependencies are inferred from the claim text.