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Section 10. METAL WASTES OZONE OXIDATION OF CONCENTRATED CYANIDE WASTEWATER FROM ELECTROPLATING OPERATIONS Leale E. Streebin, Professor Herbert M. Schornick, Assistant Professor School of Engineering University of Oklahoma Norman, Oklahoma 73019 Anthony M. Wachinski, Research Engineer Engineering and Services Laboratory Tyndall Air Force Base, Florida 32401 Chemical oxidation with ozone can be an effective method for treating organic and inorganic constituents of industrial waste streams. Many refractory materials resistant to other treatment methods can be oxidized by ozone. One application of chemical oxidation using ozone is treatment of cyanide waste [1,2]. When highly complexed metal cyanide wastes are present, ultraviolet (UV) radiation can be used successfully to breakdown many of the complexes and speed the reaction with ozone [ 3]. This paper summarizes research on the use of ozone and UV radiation in the treatment of cyanide and complexed, metal-cyanide wastes generated from electroplating operations at Tinker Air Force Base (AFB), Oklahoma City, Oklahoma. This paper presents data on treatment efficiencies, capabdities and reaction-rate relationships obtained whde treating concentrated cyanide wastes in a modified ozonation system in comparison with the alkaline chlorination system presently in use at Tinker AFB. A full-scale demonstration plant utilizing chemical oxidation with ozone was designed and constructed at the test site to treat 3,000 gallons per month of primarily nickel-strip wastes having total cyanide concentrations of up to 50,000 mdligrams per liter (mg/1). The plant was designed to operate 24 hours a day five days per week at a flow of 6.25 gallons per hour (gph). The original design goal for the system was to reduce cyanides to below detection. However, the ozone-cyanide plant never achieved appreciable cyanide removal. Following start-up, the plant was plagued with operational and maintenance problems, and subsequently, was shut down. In August 1976, a study was performed to determine the efficiency and reliabdity of the system. Upon plant start-up, several operational problems prevented evaluation of the treatment process. Principal problems included compressor breakdown, od carry-over into the air stream, inefficient prefdter operation, defective dryer operation, erratic functioning of the ozone generation system, ineffective mixing and transfer, diffuser plugging, excessive foaming, inoperative monitoring equipment and inadequate ventilation. Subsequently, in August of 1978 work was initiated to correct these and other problems, to redesign and optimize the system, and to test the modified system. The authors reported the results of the redesign and start-up of the full scale system in a previous paper |4). OZONE CYANIDE PLANT DESCRIPTION A flow diagram of the redesigned ozone plant is shown in Figure 1. The system consists of three completely mixed flow reactors in series and ancillary equipment consisting of an air-preparation system, ozone-generation system, and a waste-handling system. The air preparation system consists of compressors, dryers and fdters. Compressed air flows from the dryer through a cartridge-type fdter to remove desiccant dust, through 665
Object Description
Purdue Identification Number | ETRIWC198066 |
Title | Ozone oxidation of concentrated cyanide wastewater from electroplating operations |
Author |
Streebin, Leale E. Schornick, Herbert M. Wachinski, Anthony M. |
Date of Original | 1980 |
Conference Title | Proceedings of the 35th Industrial Waste Conference |
Extent of Original | p. 665-676 |
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 | 2009-10-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 665 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Section 10. METAL WASTES OZONE OXIDATION OF CONCENTRATED CYANIDE WASTEWATER FROM ELECTROPLATING OPERATIONS Leale E. Streebin, Professor Herbert M. Schornick, Assistant Professor School of Engineering University of Oklahoma Norman, Oklahoma 73019 Anthony M. Wachinski, Research Engineer Engineering and Services Laboratory Tyndall Air Force Base, Florida 32401 Chemical oxidation with ozone can be an effective method for treating organic and inorganic constituents of industrial waste streams. Many refractory materials resistant to other treatment methods can be oxidized by ozone. One application of chemical oxidation using ozone is treatment of cyanide waste [1,2]. When highly complexed metal cyanide wastes are present, ultraviolet (UV) radiation can be used successfully to breakdown many of the complexes and speed the reaction with ozone [ 3]. This paper summarizes research on the use of ozone and UV radiation in the treatment of cyanide and complexed, metal-cyanide wastes generated from electroplating operations at Tinker Air Force Base (AFB), Oklahoma City, Oklahoma. This paper presents data on treatment efficiencies, capabdities and reaction-rate relationships obtained whde treating concentrated cyanide wastes in a modified ozonation system in comparison with the alkaline chlorination system presently in use at Tinker AFB. A full-scale demonstration plant utilizing chemical oxidation with ozone was designed and constructed at the test site to treat 3,000 gallons per month of primarily nickel-strip wastes having total cyanide concentrations of up to 50,000 mdligrams per liter (mg/1). The plant was designed to operate 24 hours a day five days per week at a flow of 6.25 gallons per hour (gph). The original design goal for the system was to reduce cyanides to below detection. However, the ozone-cyanide plant never achieved appreciable cyanide removal. Following start-up, the plant was plagued with operational and maintenance problems, and subsequently, was shut down. In August 1976, a study was performed to determine the efficiency and reliabdity of the system. Upon plant start-up, several operational problems prevented evaluation of the treatment process. Principal problems included compressor breakdown, od carry-over into the air stream, inefficient prefdter operation, defective dryer operation, erratic functioning of the ozone generation system, ineffective mixing and transfer, diffuser plugging, excessive foaming, inoperative monitoring equipment and inadequate ventilation. Subsequently, in August of 1978 work was initiated to correct these and other problems, to redesign and optimize the system, and to test the modified system. The authors reported the results of the redesign and start-up of the full scale system in a previous paper |4). OZONE CYANIDE PLANT DESCRIPTION A flow diagram of the redesigned ozone plant is shown in Figure 1. The system consists of three completely mixed flow reactors in series and ancillary equipment consisting of an air-preparation system, ozone-generation system, and a waste-handling system. The air preparation system consists of compressors, dryers and fdters. Compressed air flows from the dryer through a cartridge-type fdter to remove desiccant dust, through 665 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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