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Centrifuges for Paper Mill Waste Sludge Dewatering W. C. MATTHEWS, Senior Staff Consultant GEORGE H. ANDREWS, Technical Director Central Research Laboratory The Mead Corporation Chillicothe, Ohio JOHN K. SULLINS, Technical Director Kingsport Division The Mead Corporation Kingsport, Tennessee INTRODUCTION The use of centrifuges in the paper industry has had a long history of successful operation in the concentration of solids materials in the papermaking operations. Mead and others have used centrifuges for the recovery of lime from the water softening process. In the Chillicothe Division of Mead, this has resulted in the recovery and reuse of 20 to 25. tons of material each day that previously was discharged to the stream. In a cooperative study (1) carried out in 1958 and 1959 by the Ohio Mills Research Group and the National Council For Stream Improvement on the sludge de- watering of paper mill wastes, it was indicated that the use of centrifuges for the concentration of sludges from the clarification of paper mill effluent nad much promise. At approximately this same time, technological improvements were being made in the design of centrifuges with the higher "G" forces and greater load capacities that made the use of this equipment more feasible than had previously been the case. As an outgrowth of these studies, centrifuges were installed in three mills in the Miami Valley in Ohio, and the results from these operations have been described in a paper presented by Bamford (2). Since that time, the number of centrifuges in the industry has increased many times so that there are now some 27 installations using a total of 34 centrifuges for the concentration of sludges resulting from the clarification of paper mill effluents. There are now more than 30 plants using centrifuges for the concentration of lime mud, and four installations using such units for the recovery of lime from water softening sludges. The two main types of centrifuges of interest are the solid bowl conveyor type and the disk centrifuge with nozzle discharge. It is the solid bowl type that has found extensive use in the paper industry, since up to the present time our main concern has been with primary treatment. As we become involved with secondary treatment, where a higher centrifugal force is needed, the disk type may be of increasing importance. The solid-bowl horizontal-conveyor type centrifuge is available in different gravitational forces. A sketch of one such unit, capable of operating up to 3200 'G" force is shown in Figure 1. This unit has a solid cylindrical bowl supported - 325 -
Object Description
Purdue Identification Number | ETRIWC196729 |
Title | Centrifuges for paper mill waste sludge dewatering |
Author |
Matthews, W. C. Andrews, George H. Sullins, John K. |
Date of Original | 1967 |
Conference Title | Proceedings of the 22nd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,14179 |
Extent of Original | p. 325-333 |
Series |
Engineering extension series no. 129 Engineering bulletin v. 52, no. 3 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-05-20 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 325 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Centrifuges for Paper Mill Waste Sludge Dewatering W. C. MATTHEWS, Senior Staff Consultant GEORGE H. ANDREWS, Technical Director Central Research Laboratory The Mead Corporation Chillicothe, Ohio JOHN K. SULLINS, Technical Director Kingsport Division The Mead Corporation Kingsport, Tennessee INTRODUCTION The use of centrifuges in the paper industry has had a long history of successful operation in the concentration of solids materials in the papermaking operations. Mead and others have used centrifuges for the recovery of lime from the water softening process. In the Chillicothe Division of Mead, this has resulted in the recovery and reuse of 20 to 25. tons of material each day that previously was discharged to the stream. In a cooperative study (1) carried out in 1958 and 1959 by the Ohio Mills Research Group and the National Council For Stream Improvement on the sludge de- watering of paper mill wastes, it was indicated that the use of centrifuges for the concentration of sludges from the clarification of paper mill effluent nad much promise. At approximately this same time, technological improvements were being made in the design of centrifuges with the higher "G" forces and greater load capacities that made the use of this equipment more feasible than had previously been the case. As an outgrowth of these studies, centrifuges were installed in three mills in the Miami Valley in Ohio, and the results from these operations have been described in a paper presented by Bamford (2). Since that time, the number of centrifuges in the industry has increased many times so that there are now some 27 installations using a total of 34 centrifuges for the concentration of sludges resulting from the clarification of paper mill effluents. There are now more than 30 plants using centrifuges for the concentration of lime mud, and four installations using such units for the recovery of lime from water softening sludges. The two main types of centrifuges of interest are the solid bowl conveyor type and the disk centrifuge with nozzle discharge. It is the solid bowl type that has found extensive use in the paper industry, since up to the present time our main concern has been with primary treatment. As we become involved with secondary treatment, where a higher centrifugal force is needed, the disk type may be of increasing importance. The solid-bowl horizontal-conveyor type centrifuge is available in different gravitational forces. A sketch of one such unit, capable of operating up to 3200 'G" force is shown in Figure 1. This unit has a solid cylindrical bowl supported - 325 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
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