Use of cyclodextrins for odor control in papermaking sludges, and deodorized sludge and products
AssigneeBuckman Laboratories International, Inc.
InventorsGerald M. Dykstra, James N. Graham, Scott D. Branum
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Abstract
Methods to control and suppress odor in papermaking sludge are described. One method involves admixing sludge from a papermaking process and cyclodextrin to provide treated sludge with the cyclodextrin present in an effective amount to control odors in the treated sludge. The deodorized sludge may be used as a component of resin-wood composite products, such as composite decking materials, walls, flooring, casting forms, and the like.
Claims26
A method for controlling odor in sludge from a papermaking process, comprising flocculating sludge from a papermaking process, at least partly dewatering the sludge after said flocculating on at least one dewatering device, and admixing the sludge and cyclodextrin after the flocculating and the dewatering to provide treated sludge with the cyclodextrin present in an effective amount to control odors in the treated sludge.
A method for controlling odor in sludge from a papermaking process, comprising:
- a) providing a mixed sludge from a papermaking process;
- b) admixing the mixed sludge and a flocculant, providing flocculated sludge;
- c) dewatering the flocculated sludge, providing thickened sludge;
- d) conducting the thickened sludge into a screw press and discharging dry sludge as extrudate from the screw press,
- wherein introducing of cyclodextrin is done in conjunction with step d) in an effective amount to control odors in the dry sludge.
Dependencies are inferred from the claim text.