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4744903 Waste water treatment
VIII
New Patents
dioxide using an activated carbon bed 2, by continuously repeating the following cycle of operations: (1) expose the carbon in the bed 2 to the atmosphere in the fruit store 1, until saturated with CO2 (12 minutes); (2) evacuate the bed 2, down to 7 kPa, to the gas reservoir 5, whereby the 02 and N2 (but not CO2) are released in fruit store proportions into the reservoir (2 minutes); (3) expose the bed 2 to air to purge it of the CO2 (18 minutes); (4) evacuate the bed 2 to waste (7 kPa is adequate) to remove 02 and N2, which would otherwise remain in the bed in substantially air proportions (i.e. excessive oxygen) (2 minutes); (5) expose the bed 2 to the gas put in the reservoir 5 at operation (2) above, so that the bed 2 now contains 02 and N2 in fruit store proportions (2 minutes); (1) expose the adsorptive medium to chamber atmosphere; and so forth indefinitely.
4744903 WASTE WATER TREATMENT Terry L McAninch, David Hughes, Robert D McDonough assigned to Birko Corporation A process for facilitating the separation of fat from a waste stream composition comprising water, fat, fatty acids and solids produced in food processing plants and animal rendering plants. In one embodiment, an alkaline pH control composition and an aluminum salt flocculant composition are added to the waste stream composition for subsequent separation in a clarifier of the waste stream composition into an essentially fatty layer, an essentially water layer, and an essentially solids layer. In a second embodiment, a conventional dissolved air flotation system is employed. An acidified aluminum salt flocculant composition is added to the waste stream composition prior to dissolved air introduction. The resulting waste stream composi-. tion subsequently separates in a clarifier into the three layers described above.
4744904 WASTE WATER TREATMENT Terry McAninch, Rodney D Cooke assigned to Birko Corporation Waste water from fat rendering and meat processing plants is treated in a conventional clarifier to produce better separation of suspended solids and fat from waste water by the addi-
tion of a first solution of pH controlling agent in combination with a surfactant and a second solution of a flocculating agent into the waste water streams entering the clarifier.
4746414 ZERO DISCHARGE SPRAY RINSE SYSTEM FOR ELECTROPLATING OPERATIONS Charles J Carpenter, Monsabert Winston de assigned to The United States of America as represented by the Secretary of the Navy The zero discharge spray system comprises a tank for collecting and storing rinse water, a set of spray nozzles aligned within the tank, and a pump for both pumping used rinse water through the spray nozzles and/or to the plating bath as makeup for evaporation. A timer level control system maintains the plating bath level and the rinse tank level, and limits the nozzles spray time. The system also includes a fresh water spray for final rinse of plated parts. By using a controlled spray rinse system which reduces the amount of water added to the system so as not to exceed that lost by evaporation, no contaminated rinse water is discharged as waste.
4749494 TREATMENT OF WASTE WATER BY THE ACTIVATED SLUDGE PROCESS Takaharu Tomoyasu, Yuzaburo Kumagai, Shiro Honda, Hikoyosh Kanayama, Chiba, Japan assigned to Mitsui Sekiyu Kagaku Kogyo Kabushiki Kaisha An activated sludge treatment process for waste water characterized in that, in the waste water treatment where waste water containing organic matter is introduced into an activated sludge reaction tank and the excess sludge formed in the reaction tank is introduced into a sludge digestion tank to effect the digestion of said excess sludge by intermittent aeration with air, a part of the digestion tank liquid is passed through a filtration apparatus having an ultrafiltration membrane, the filtrate passed therethrough is withdrawn outside the system, the remainder is circulated to the digestion tank to maintain the liquid volume of the digestion tank at a definite level, and when the amount of the reaction tank liquid introduced from the reaction tank into the
New Patents
dioxide using an activated carbon bed 2, by continuously repeating the following cycle of operations: (1) expose the carbon in the bed 2 to the atmosphere in the fruit store 1, until saturated with CO2 (12 minutes); (2) evacuate the bed 2, down to 7 kPa, to the gas reservoir 5, whereby the 02 and N2 (but not CO2) are released in fruit store proportions into the reservoir (2 minutes); (3) expose the bed 2 to air to purge it of the CO2 (18 minutes); (4) evacuate the bed 2 to waste (7 kPa is adequate) to remove 02 and N2, which would otherwise remain in the bed in substantially air proportions (i.e. excessive oxygen) (2 minutes); (5) expose the bed 2 to the gas put in the reservoir 5 at operation (2) above, so that the bed 2 now contains 02 and N2 in fruit store proportions (2 minutes); (1) expose the adsorptive medium to chamber atmosphere; and so forth indefinitely.
4744903 WASTE WATER TREATMENT Terry L McAninch, David Hughes, Robert D McDonough assigned to Birko Corporation A process for facilitating the separation of fat from a waste stream composition comprising water, fat, fatty acids and solids produced in food processing plants and animal rendering plants. In one embodiment, an alkaline pH control composition and an aluminum salt flocculant composition are added to the waste stream composition for subsequent separation in a clarifier of the waste stream composition into an essentially fatty layer, an essentially water layer, and an essentially solids layer. In a second embodiment, a conventional dissolved air flotation system is employed. An acidified aluminum salt flocculant composition is added to the waste stream composition prior to dissolved air introduction. The resulting waste stream composi-. tion subsequently separates in a clarifier into the three layers described above.
4744904 WASTE WATER TREATMENT Terry McAninch, Rodney D Cooke assigned to Birko Corporation Waste water from fat rendering and meat processing plants is treated in a conventional clarifier to produce better separation of suspended solids and fat from waste water by the addi-
tion of a first solution of pH controlling agent in combination with a surfactant and a second solution of a flocculating agent into the waste water streams entering the clarifier.
4746414 ZERO DISCHARGE SPRAY RINSE SYSTEM FOR ELECTROPLATING OPERATIONS Charles J Carpenter, Monsabert Winston de assigned to The United States of America as represented by the Secretary of the Navy The zero discharge spray system comprises a tank for collecting and storing rinse water, a set of spray nozzles aligned within the tank, and a pump for both pumping used rinse water through the spray nozzles and/or to the plating bath as makeup for evaporation. A timer level control system maintains the plating bath level and the rinse tank level, and limits the nozzles spray time. The system also includes a fresh water spray for final rinse of plated parts. By using a controlled spray rinse system which reduces the amount of water added to the system so as not to exceed that lost by evaporation, no contaminated rinse water is discharged as waste.
4749494 TREATMENT OF WASTE WATER BY THE ACTIVATED SLUDGE PROCESS Takaharu Tomoyasu, Yuzaburo Kumagai, Shiro Honda, Hikoyosh Kanayama, Chiba, Japan assigned to Mitsui Sekiyu Kagaku Kogyo Kabushiki Kaisha An activated sludge treatment process for waste water characterized in that, in the waste water treatment where waste water containing organic matter is introduced into an activated sludge reaction tank and the excess sludge formed in the reaction tank is introduced into a sludge digestion tank to effect the digestion of said excess sludge by intermittent aeration with air, a part of the digestion tank liquid is passed through a filtration apparatus having an ultrafiltration membrane, the filtrate passed therethrough is withdrawn outside the system, the remainder is circulated to the digestion tank to maintain the liquid volume of the digestion tank at a definite level, and when the amount of the reaction tank liquid introduced from the reaction tank into the