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5 REMEDIATION OF GMC-CENTRAL FOUNDRY DIVISION-DEFIANCE FOUNDRY HAZARDOUS WASTE SETTLING BASIN Ajit K. Chowdhury, Senior Chemical Engineer Richard C. Krueger, Project Engineer Michael A. Warner, Project Engineer RMT, Inc. Madison, Wisconsin 53708 Thomas R. Wirth, Senior Environmental Engineer General Motors Corporation Central Foundry Division Defiance, Ohio 43512 INTRODUCTION General Motors Corporation —Central Foundry Division —Defiance (CFD —Defiance) operates a ferrous foundry in Defiance, Ohio. Particulate emissions from the cupola operations are collected by wet cap and venturi scrubber emission control systems. The wastewater from the emission control systems is conveyed to a settling basin, and the effluent is reused in the plant. The accumulated sludge in the settling basin has been periodically removed by hydraulic dredging, and disposed in an on-site, state-approved, solid waste landfill. In the process of complying with NPDES regulations and Federal Metal Molding and Casting Effluent Guidelines, several sludge samples from different parts of the basin were collected and analyzed. Slightly more than half of these samples released lead in the EP Toxicity test above the hazardous waste criterion of 5.0 mg/L. CFD —Defiance notified the United States Environmental Protection Agency (USEPA) and the Ohio Environmental Protection Agency (OEPA) that the basin contained EP-Toxic sludge. As a result, CFD —Defiance and the OEPA negotiated a consent order for management of the sludge. To prevent generation of new hazardous sludge, an in-line wastewater treatment system was installed upstream from the basin to treat the incoming solids. For remediation of the hazardous solids in the basin, a continuous treatment process using a hydraulic dredging system with in-line addition of phosphoric acid was developed by RMT, Inc and implemented by CFD —Defiance. The EP-Toxic sludge in the basin (approximately 400,000 cubic yards) was remediated with this system (slurried and treated) to render the sludge nonhazardous, according to an OEPA-approved "Closure Plan" for achieving RCRA clean closure. The basin remained in use during the remediation process. BENCH-SCALE TREATABILITY TESTING Several composite samples of the basin sludge, with initial EP-Toxicity lead concentration varying from 8 to 38.5 mg/L, were treated with different chemical additives to evaluate various treatment possibilities for rendering the sludge non-EP-Toxic. The bench-scale treatability tests were designed to test the following variables: • Concentration of solids in test slurry. • Type and dosage of chemical additive. • Final treated slurry pH. • Additives for control of final slurry pH. Treatment additives evaluated during initial screening included: • Phosphates (three forms) • Magnesium hydroxide (two grades) 45th Purdue Industrial Waste Conference Proceedings, © 1991 Lewis Publishers, Inc., Chelsea, Michigan 48118. PrintpH in 1 I <; A Printed in U.S.A 37
Object Description
Purdue Identification Number | ETRIWC199005 |
Title | Remediation of GMC-Central Foundry Division-Defiance Foundry hazardous waste settling basin |
Author |
Chowdhury, Ajit K. Krueger, Richard C. Warner, Michael A. Wirth, Thomas R. |
Date of Original | 1990 |
Conference Title | Proceedings of the 45th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,41605 |
Extent of Original | p. 37-44 |
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 | 2009-08-18 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 37 |
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 | 5 REMEDIATION OF GMC-CENTRAL FOUNDRY DIVISION-DEFIANCE FOUNDRY HAZARDOUS WASTE SETTLING BASIN Ajit K. Chowdhury, Senior Chemical Engineer Richard C. Krueger, Project Engineer Michael A. Warner, Project Engineer RMT, Inc. Madison, Wisconsin 53708 Thomas R. Wirth, Senior Environmental Engineer General Motors Corporation Central Foundry Division Defiance, Ohio 43512 INTRODUCTION General Motors Corporation —Central Foundry Division —Defiance (CFD —Defiance) operates a ferrous foundry in Defiance, Ohio. Particulate emissions from the cupola operations are collected by wet cap and venturi scrubber emission control systems. The wastewater from the emission control systems is conveyed to a settling basin, and the effluent is reused in the plant. The accumulated sludge in the settling basin has been periodically removed by hydraulic dredging, and disposed in an on-site, state-approved, solid waste landfill. In the process of complying with NPDES regulations and Federal Metal Molding and Casting Effluent Guidelines, several sludge samples from different parts of the basin were collected and analyzed. Slightly more than half of these samples released lead in the EP Toxicity test above the hazardous waste criterion of 5.0 mg/L. CFD —Defiance notified the United States Environmental Protection Agency (USEPA) and the Ohio Environmental Protection Agency (OEPA) that the basin contained EP-Toxic sludge. As a result, CFD —Defiance and the OEPA negotiated a consent order for management of the sludge. To prevent generation of new hazardous sludge, an in-line wastewater treatment system was installed upstream from the basin to treat the incoming solids. For remediation of the hazardous solids in the basin, a continuous treatment process using a hydraulic dredging system with in-line addition of phosphoric acid was developed by RMT, Inc and implemented by CFD —Defiance. The EP-Toxic sludge in the basin (approximately 400,000 cubic yards) was remediated with this system (slurried and treated) to render the sludge nonhazardous, according to an OEPA-approved "Closure Plan" for achieving RCRA clean closure. The basin remained in use during the remediation process. BENCH-SCALE TREATABILITY TESTING Several composite samples of the basin sludge, with initial EP-Toxicity lead concentration varying from 8 to 38.5 mg/L, were treated with different chemical additives to evaluate various treatment possibilities for rendering the sludge non-EP-Toxic. The bench-scale treatability tests were designed to test the following variables: • Concentration of solids in test slurry. • Type and dosage of chemical additive. • Final treated slurry pH. • Additives for control of final slurry pH. Treatment additives evaluated during initial screening included: • Phosphates (three forms) • Magnesium hydroxide (two grades) 45th Purdue Industrial Waste Conference Proceedings, © 1991 Lewis Publishers, Inc., Chelsea, Michigan 48118. PrintpH in 1 I <; A Printed in U.S.A 37 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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