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37 TREATMENT OF AN ANODIZING WASTE TO WATER QUALITY BASED EFFLUENT LIMITS Mohammad Naziruddin, Project Engineer George C. Patrick, Project Manager Jordan, Jones & Goulding, Inc. Atlanta, Georgia 30340 Loren McCune, Senior Technical Associate Tredegar Industries Newnan, Georgia 30264 Tredegar Industries owns and operates an architectural aluminum production facility. Raw aluminum is smelted, extruded into various shapes, and finished by a selected combination of chemical etching operations. The majority of wastewater generated at this plant comes from the finishing step, where the contents of the finishing tanks and rinsewaters make-up the flow to the wastewater treatment plant. The rinsewaters overflow the tanks and discharge continuously to the wastewater treatment plant. The concentration tanks are discharged when the effective strength of the chemical solution weakens or when a manufacturing change is ordered. In addition, storm water runoff from areas which may be contaminated with oil or grease or chemical reagents is discharged to the waste treatment plant. BACKGROUND In December 1989, a project was initiated to upgrade the existing wastewater treatment plant. The upgrade was performed to replace the existing sedimentation facilities and to provide equalization. Additionally, the new treatment system would be designed to contain sludge thickening and mechanical dewatering. During December 1989, the NPDES permit for the existing treatment plant was reissued. The new limits were based upon water quality based standards; whereas, the previous limits had been based upon categorical standards. Because the plant discharged to a stream which had a 7 day/10 year low flow of zero, the effluent limits for the stream were calculated using no dilution. The new metal limits for the NPDES permit are shown in Table I. For the water quality based limits, there is no distinction between average and maximum values. For these metals there is no average limit, only a maximum limit. For aluminum, the only metal limit which was not based upon water quality criteria, there were maximum and average permit limits. Since new, more stringent limits were being established by the regulatory agency, it was decided to conduct wastewater treatability studies to assure that the new plant would meet these limits. The focus of the studies was to evaluate metals precipitation of the anodizing wastewaters. The existing treatment system employed a metals precipitation process using lime and an alkaline manufacturing by- Table I. Permit Limits Based Upon Water Quality Standards Discharge Limitations Effluent Average Maximum Detection Limit Characteristic (lb/day) (mg/L) (lb/day) (mg/L) (mg/L) Aluminum Chromium (T) Copper Nickel Zinc 11.3 0.470 1.40 0.370 0.021 0.280 0.190 22.8 1.30 3.76 0.370 0.021 0.280 0.190 0.10 0.010 0.020 0.010 0.010 Waste Conference Proceedings, 1992 Lewis Publishers, Inc., Chelsea, 46lh Purdue Industrial Michigan 48118. Printed in U.S.A. 357
Object Description
Purdue Identification Number | ETRIWC199137 |
Title | Treatment of an anodizing waste to water quality based effluent limits |
Author |
Naziruddin, Mohammad Patrick, George C. McCune, Loren |
Date of Original | 1991 |
Conference Title | Proceedings of the 46th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,42649 |
Extent of Original | p. 357-368 |
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 | 2009-11-24 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 357 |
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 | 37 TREATMENT OF AN ANODIZING WASTE TO WATER QUALITY BASED EFFLUENT LIMITS Mohammad Naziruddin, Project Engineer George C. Patrick, Project Manager Jordan, Jones & Goulding, Inc. Atlanta, Georgia 30340 Loren McCune, Senior Technical Associate Tredegar Industries Newnan, Georgia 30264 Tredegar Industries owns and operates an architectural aluminum production facility. Raw aluminum is smelted, extruded into various shapes, and finished by a selected combination of chemical etching operations. The majority of wastewater generated at this plant comes from the finishing step, where the contents of the finishing tanks and rinsewaters make-up the flow to the wastewater treatment plant. The rinsewaters overflow the tanks and discharge continuously to the wastewater treatment plant. The concentration tanks are discharged when the effective strength of the chemical solution weakens or when a manufacturing change is ordered. In addition, storm water runoff from areas which may be contaminated with oil or grease or chemical reagents is discharged to the waste treatment plant. BACKGROUND In December 1989, a project was initiated to upgrade the existing wastewater treatment plant. The upgrade was performed to replace the existing sedimentation facilities and to provide equalization. Additionally, the new treatment system would be designed to contain sludge thickening and mechanical dewatering. During December 1989, the NPDES permit for the existing treatment plant was reissued. The new limits were based upon water quality based standards; whereas, the previous limits had been based upon categorical standards. Because the plant discharged to a stream which had a 7 day/10 year low flow of zero, the effluent limits for the stream were calculated using no dilution. The new metal limits for the NPDES permit are shown in Table I. For the water quality based limits, there is no distinction between average and maximum values. For these metals there is no average limit, only a maximum limit. For aluminum, the only metal limit which was not based upon water quality criteria, there were maximum and average permit limits. Since new, more stringent limits were being established by the regulatory agency, it was decided to conduct wastewater treatability studies to assure that the new plant would meet these limits. The focus of the studies was to evaluate metals precipitation of the anodizing wastewaters. The existing treatment system employed a metals precipitation process using lime and an alkaline manufacturing by- Table I. Permit Limits Based Upon Water Quality Standards Discharge Limitations Effluent Average Maximum Detection Limit Characteristic (lb/day) (mg/L) (lb/day) (mg/L) (mg/L) Aluminum Chromium (T) Copper Nickel Zinc 11.3 0.470 1.40 0.370 0.021 0.280 0.190 22.8 1.30 3.76 0.370 0.021 0.280 0.190 0.10 0.010 0.020 0.010 0.010 Waste Conference Proceedings, 1992 Lewis Publishers, Inc., Chelsea, 46lh Purdue Industrial Michigan 48118. Printed in U.S.A. 357 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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