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The Flue Gas Method of Treating Chrome Plating Waste James W. Canan, Senior Engineer Brown-Lipe-Chapin Division General Motors Corporation Elyria, Ohio The discharge of rinse waters from electroplating plants has long been a source of polution of streams and sanitary sewers. Due to the very nature of rinsing, which is basically controlled dilution, the concentrations of the contaminating chemicals have been low, but nevertheless troublesome for the proper biological maintenance of our streams and rivers. The low concentration of contaminating chemicals creates a severe economic problem in achieving their effective removal. One chemical commonly found in the waste effluent from electroplating plants is chromium, especially and particularly the hexavalent ion of chrome. Chromic acid is used in plating plants for several purposes. In addition to plating solutions, anodizing, chormating, and paint pretreatment solutions are also common contributors of hexavalent chrome to the waste water. Although the concentrated solutions may be disposed of infrequently, the rinses following these concentrated baths are continually being discharged to either rivers or sanitary sewers. Many states have laws and regulations which limit the concentrations of this particular chemical that may be discharged into natural waterways. A concentration often cited is 2.0 ppm maximum. Another reason for requiring low concentrations of chromium, in addition to its harmful chemical and biological effects, is the strong color imparted to streams by even relatively low concentrations of chromium. Considerable effort and monies have been expended by private industry, universities, municipalities, and state agencies to develop methods for removal of the chromic acid from industrial waste effluents. A continuous effort is being maintained by these same agencies to further improve current methods both from an efficiency as well as a cost standpoint. It is felt that the method to be proposed here will provide a substantial cost reduction to any plant currently employing the precipitation method of removing chromium from its waste. 26
Object Description
Purdue Identification Number | ETRIWC195903 |
Title | Flue gas method of treating chrome plating waste |
Author | Canan, James W. |
Date of Original | 1959 |
Conference Title | Proceedings of the fourteenth Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/cdm4/document.php?CISOROOT=/engext&CISOPTR=7117&REC=11 |
Extent of Original | p. 26-31 |
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 | 2008-09-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 26 |
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 | The Flue Gas Method of Treating Chrome Plating Waste James W. Canan, Senior Engineer Brown-Lipe-Chapin Division General Motors Corporation Elyria, Ohio The discharge of rinse waters from electroplating plants has long been a source of polution of streams and sanitary sewers. Due to the very nature of rinsing, which is basically controlled dilution, the concentrations of the contaminating chemicals have been low, but nevertheless troublesome for the proper biological maintenance of our streams and rivers. The low concentration of contaminating chemicals creates a severe economic problem in achieving their effective removal. One chemical commonly found in the waste effluent from electroplating plants is chromium, especially and particularly the hexavalent ion of chrome. Chromic acid is used in plating plants for several purposes. In addition to plating solutions, anodizing, chormating, and paint pretreatment solutions are also common contributors of hexavalent chrome to the waste water. Although the concentrated solutions may be disposed of infrequently, the rinses following these concentrated baths are continually being discharged to either rivers or sanitary sewers. Many states have laws and regulations which limit the concentrations of this particular chemical that may be discharged into natural waterways. A concentration often cited is 2.0 ppm maximum. Another reason for requiring low concentrations of chromium, in addition to its harmful chemical and biological effects, is the strong color imparted to streams by even relatively low concentrations of chromium. Considerable effort and monies have been expended by private industry, universities, municipalities, and state agencies to develop methods for removal of the chromic acid from industrial waste effluents. A continuous effort is being maintained by these same agencies to further improve current methods both from an efficiency as well as a cost standpoint. It is felt that the method to be proposed here will provide a substantial cost reduction to any plant currently employing the precipitation method of removing chromium from its waste. 26 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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