C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/12
C02F 1/24 (2006.01) C02F 1/54 (2006.01) C02F 3/02 (2006.01) C02F 3/12 (2006.01) C02F 9/00 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1303259
SYSTEM AND METHOD FOP TREATING PULP AND PAPER MILL WASTE WATER Abstract of the Disclosure A system and method for converting pulp and paper mill waste water into a decolored neutral pH effluent and a solid suitable for use as fuel in a furnace. The treatment system is used following primary and secondary treatment of pulp and paper mill waste waters typically found in the in- dustry. After secondary biological treatment, the waste waters are pumped to a coagulation tank where the waste water is brought in contact with a polyamine coagulant which coagu- lates lignins, degraded sugars, and other compounds which typically discolor this water. The coagulation particles are increased in size by addition of an acrylamide polymer in a floculation tank to improve the hydrophllic characteristics of the coagulant. The waste water is then mixed a dissolved air and water solution under pressure. Upon dissolution of the dissolved air at atmospheric pressure the air is absorbed by the floculated matter in the aeration tank and the flocu- lated matter is caused to migrate towards the area of less pressure, i.e. the surface of the tank. The floculated matter accumulates on the surface of the floculating tank and can be skimmed from the top, dried and ultimately burned in a furnace.
525230
Sim & Mcburney
Stone Container Corporation
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