B - Operations – Transporting – 09 – B
Patent
B - Operations, Transporting
09
B
161/1, 403/6
B09B 3/00 (2006.01) B05B 15/12 (2006.01) C02F 11/00 (2006.01) C08J 11/00 (2006.01)
Patent
CA 1326937
METHOD AND APPARATUS FOR TREATING WASTE PAINT SLUDGE ABSTRACT A method and apparatus are disclosed for the treatment of paint sludge and for reducing volatile organic compound emissions from a paint spraybooth operation, thereby obtaining a recyclable material for use in new coating products. In such an operation, uncured paint resins mixed with volatile organic compounds are sprayed onto an article to be painted and at least a portion of the overspray is mixed with water to form a waste stream containing water, uncured paint resin, volatile organic compounds and inorganic substances. The method comprises the steps of: removing a portion of the water and liquid volatile organic compounds from the waste stream, heating the resultant sludge to volatilize the residual water and liquid volatile organic compounds and to cure the uncured paint resin, collecting the residual solids stream, and removing all of the volatilized organic compounds from the resultant said stream thereby generating a volatized organic compounds-free gas effluent. The amount of said volatized organic compounds removed is at least about 5% of the volatile organic compounds input to the paint spraybooth operation. The apparatus comprises a waste paint stream dewatering device, an enclosed rotary screw heat exchanger maintained in an inert environment, means for adding a scouring aggregate to the sludge before heating and for removing the aggregate after heating, a separator for removing entrained solids from the resulting gas stream, and a means for processing the gas stream to remove all VOC.
601689
Johnson Jeffrey C.
Slater Andrew
Finlayson & Singlehurst
Haden Schweitzer Corporation
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