公开(公告)号：DE69308802D1

公开(公告)日：1997-04-17

申请号：DE69308802

申请日：1993-07-09

Applicant: TECH RESOURCES PTY LTD

Inventor： BATTERHAM ROBIN ,  HOFFMANN WARWICK ,  CONOCHIE DAVID

IPC: B01F3/04 ,  B01F5/04 ,  B01F15/02 ,  B01J8/18 ,  B01J10/00 ,  B01J19/18 ,  C02F3/14

Abstract: PCT No. PCT/AU93/00340 Sec. 371 Date Mar. 16, 1994 Sec. 102(e) Date Mar. 16, 1994 PCT Filed Jul. 9, 1993 PCT Pub. No. WO94/01210 PCT Pub. Date Jan. 20, 1994.A reactor for introducing gas into a fluid comprises a mixing tank (12, 43) for the fluid and a partition means (13,45) for dividing the tank into at least two chambers (21, 89) and (23, 91). The reactor further comprises a first pump means (14, 47) located in one of the chambers for circulating the fluid downwards in one chamber and then upward in the other chamber and an aerator assembly (29, 49) for aerating a sidestream of the fluid and introducing the aerated fluid into the tank for mixing the aerated fluid with the circulating fluid in the tank. The aerator assembly comprises a bank of venturi aerators (38, 57) each having an aerator inlet; an aerator outlet; and a constriction intermediate the aerator inlet and the aerator outlet for creating a region of reduced pressure in the fluid, the constriction being elongate in a section transverse to the direction of flow of the fluid through the constriction; and a means for introducing the gas into the constriction to aerate the fluid.

公开(公告)号：DE69308802T2

公开(公告)日：1997-06-19

申请号：DE69308802

申请日：1993-07-09

Applicant: TECH RESOURCES PTY LTD

Inventor： BATTERHAM ROBIN ,  HOFFMANN WARWICK ,  CONOCHIE DAVID

IPC: B01F3/04 ,  B01F5/04 ,  B01F15/02 ,  B01J8/18 ,  B01J10/00 ,  B01J19/18 ,  C02F3/14

Abstract: PCT No. PCT/AU93/00340 Sec. 371 Date Mar. 16, 1994 Sec. 102(e) Date Mar. 16, 1994 PCT Filed Jul. 9, 1993 PCT Pub. No. WO94/01210 PCT Pub. Date Jan. 20, 1994.A reactor for introducing gas into a fluid comprises a mixing tank (12, 43) for the fluid and a partition means (13,45) for dividing the tank into at least two chambers (21, 89) and (23, 91). The reactor further comprises a first pump means (14, 47) located in one of the chambers for circulating the fluid downwards in one chamber and then upward in the other chamber and an aerator assembly (29, 49) for aerating a sidestream of the fluid and introducing the aerated fluid into the tank for mixing the aerated fluid with the circulating fluid in the tank. The aerator assembly comprises a bank of venturi aerators (38, 57) each having an aerator inlet; an aerator outlet; and a constriction intermediate the aerator inlet and the aerator outlet for creating a region of reduced pressure in the fluid, the constriction being elongate in a section transverse to the direction of flow of the fluid through the constriction; and a means for introducing the gas into the constriction to aerate the fluid.

公开(公告)号：NZ268852A

公开(公告)日：1997-03-24

申请号：NZ26885294

申请日：1994-07-15

Applicant: TECH RESOURCES PTY LTD

Inventor： MCALLISTER PETER JAMES ,  ROY IAN ,  HOFFMANN WARWICK ,  BEAUPEURT SUSAN MERYL

IPC: C12N1/14 ,  B08B7/00 ,  B09B3/00 ,  B09B5/00 ,  B44D3/16 ,  C09D9/02 ,  C12N1/20 ,  C12P1/02 ,  C12R1/82 ,  C12S9/00 ,  C22B1/00 ,  C23G5/00 ,  B08B3/10 ,  B08B9/38

Abstract: This invention relates to novel methods for removing paint, lacquers and other coatings from metal and alloy materials, in particular metallic cans. One method of the present invention involves a combination of steps including: (i) a pre-treatment step to alter the structure of the paint, lacquer or other coating, such pre-treatment preferably involving heat, making the coating more amenable to biostripping; and (ii) contacting the metal or alloy material with a bacterial culture capable of removing said coating. In an alternative method the combination of steps includes: (i) a heat treatment step to alter the structure of the paint, lacquer or other coating; and (ii) an abrasive treatment involving contacting the heat treated coated metal or alloy material in step (i) with a similarly heated material and/or with an untreated and/or uncoated like metal or alloy material, wherein the contact is caused by rolling in a rolling reactor. The abrasion step makes the paint, lacquer or coating of the metal or alloy in step (2) amenable to stripping with a fluid which fluid is either present in the rolling reactor or is jet sprayed onto the heat treated and abraded coated metal or alloy material. The removed paint, lacquer or other coating, and/or the liquid used to remove the coating is treated with orgamisms such as bacteria, capable of degrading said coating, before subsequent disposal.