Method for recovering particulate and scavenging formaldehyde

Details Method for recovering particulate and scavenging formaldehyde Method for recovering particulate and scavenging formaldehyde

B - Operations, Transporting

01

D

B01D 36/00 (2006.01) B01D 61/14 (2006.01) B27N 1/00 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2146748

A thin film mem- brane filtration system (50) recovers particulate from the waste water stream (66) of a wood panel fabrica- tion process to a desired concentration of approxi- mately 30-50 % solid by weight. The high concen- tration level enables im- proved transport or dispo- sal. Rather than discard the concentrate, however, the concentrate is added into subsequent wood pan- el "particle board" batches at a rate of approximately 0.5 to 0.65 gallons per 1000 pounds of wood pro- duct. The concentrate re- duces press time, serves as a scavenger for tying up formaldehyde and serves as a resin extender for strengthening internal bonds of fabricated pan- els. The membranes (54) capture the particulate into an accumulated concentrate, while passing permeate output to a recycle water stream (80).

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