page 600 |
Previous | 1 of 13 | Next |
|
|
Loading content ...
Extreme Removals of Suspended Solids and BOD in Tannery Wastes by Coagulation with Chrome Tan Dump Liquors O. J. SPROUL, Professor K. KESHAVAN, Associate Professor Department of Civil Engineering University of Maine Orono, Maine R. E. HUNTER, Vice President Edward C. Jordan Company, Inc. Portland, Maine INTRODUCTION The treatment of tannery wastes has continued to be a difficult problem. This is true in spite of the fact that the tanning of hides is one of the oldest industries known to man. Generally the solution to the problem has been one of individual investigation tailored for each tannery. There seemingly have not been general treatment procedures which have worked well with the various types of tanning processes. It appears, however, that there is renewed interest in the treatment of tannery wastes, not only in the United States, but particularly in other parts of the world. Recent reports have been made by several investigators (1,2,3). Wims' (2) report deals with the pretreatment of wastes for discharge to a municipal plant. Braunschweig( 1) noted that lowering the pH of a raw effluent (chrome tanned) reduced the total volatile solids by about 55 per cent when the pH was lowered from 11.2 to 8.0. Sproul, et al (3) reported on treatment by sedimentation, coagulation and pH adjustment. Haseltine (4), reporting on a combined tannery and municipal treatment plant, indicated an apparent average BOD removal of 54 per cent while the suspended solids removal was only 13.7 per cent. It was the objective of this work to develop design criteria for a treatment plant for a chrome tanned cattleskin tannery waste. It was desired to develop a system which would maximize the removals of suspended solids in addition to the BOD. During the course of this work the tannery changed its processing so as to recover the hair. This afforded an opportunity to make a in-plant comparison of the waste characteristics from a situation where the hair was "burned" with a high lime and sulfide reaction and one where the hair was recovered with a process using proprietary compounds and much less lime and sulfide. METHODS AND PROCEDURES The methods involved in the individual design criteria determinations will be discussed as they are presented. The analytical determinations were done in accordance with those described in Standard Methods (5). Certain of the suspended solids determinations, particularly those for the sedimentation studies, were made by centrifuging an appropriate volume of the sample, generally 25 ml, in a centrifuge. The centrifuge was operated for 10 min at 3,300 rpm. The radius to the - 600 -
Object Description
Purdue Identification Number | ETRIWC196651 |
Title | Extreme removals of suspended solids and BOD in tannery wastes by coagulation with chrome tan dump liquors |
Author |
Sproul, Otis J. Keshavan, K. Hunter, R. E. |
Date of Original | 1966 |
Conference Title | Proceedings of the 21st Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/u?/engext,12965 |
Extent of Original | p. 600-612 |
Series |
Engineering extension series no. 121 Engineering bulletin v. 50, no. 2 |
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 600 |
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 | Extreme Removals of Suspended Solids and BOD in Tannery Wastes by Coagulation with Chrome Tan Dump Liquors O. J. SPROUL, Professor K. KESHAVAN, Associate Professor Department of Civil Engineering University of Maine Orono, Maine R. E. HUNTER, Vice President Edward C. Jordan Company, Inc. Portland, Maine INTRODUCTION The treatment of tannery wastes has continued to be a difficult problem. This is true in spite of the fact that the tanning of hides is one of the oldest industries known to man. Generally the solution to the problem has been one of individual investigation tailored for each tannery. There seemingly have not been general treatment procedures which have worked well with the various types of tanning processes. It appears, however, that there is renewed interest in the treatment of tannery wastes, not only in the United States, but particularly in other parts of the world. Recent reports have been made by several investigators (1,2,3). Wims' (2) report deals with the pretreatment of wastes for discharge to a municipal plant. Braunschweig( 1) noted that lowering the pH of a raw effluent (chrome tanned) reduced the total volatile solids by about 55 per cent when the pH was lowered from 11.2 to 8.0. Sproul, et al (3) reported on treatment by sedimentation, coagulation and pH adjustment. Haseltine (4), reporting on a combined tannery and municipal treatment plant, indicated an apparent average BOD removal of 54 per cent while the suspended solids removal was only 13.7 per cent. It was the objective of this work to develop design criteria for a treatment plant for a chrome tanned cattleskin tannery waste. It was desired to develop a system which would maximize the removals of suspended solids in addition to the BOD. During the course of this work the tannery changed its processing so as to recover the hair. This afforded an opportunity to make a in-plant comparison of the waste characteristics from a situation where the hair was "burned" with a high lime and sulfide reaction and one where the hair was recovered with a process using proprietary compounds and much less lime and sulfide. METHODS AND PROCEDURES The methods involved in the individual design criteria determinations will be discussed as they are presented. The analytical determinations were done in accordance with those described in Standard Methods (5). Certain of the suspended solids determinations, particularly those for the sedimentation studies, were made by centrifuging an appropriate volume of the sample, generally 25 ml, in a centrifuge. The centrifuge was operated for 10 min at 3,300 rpm. The radius to the - 600 - |
Resolution | 300 ppi |
Color Depth | 8 bit |
Tags
Comments
Post a Comment for page 600