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Related Experiment Videos

Lead removal from foundry waste by solvent extraction.

D B Shah1, A V Phadke, W M Kocher

  • 1Department of Chemical Engineering, Fenn College of Engineering, Cleveland State University Cleveland, Ohio 44115, USA.

Journal of the Air & Waste Management Association (1995)
|March 1, 1995
PubMed
Summary

Solvent extraction effectively removes lead from foundry waste solids using a toluene and di-(2-ethyl-hexyl) phosphoric acid (HDEHP) mixture. This method significantly reduces lead concentrations, making waste treatment more efficient.

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Area of Science:

  • Environmental Chemistry
  • Waste Management

Background:

  • Foundry process waste, specifically millpond wastewater solids, often contains high lead concentrations.
  • Effective methods are needed to reduce lead levels in industrial waste for environmental protection.

Purpose of the Study:

  • To investigate the efficacy of solvent extraction for reducing lead concentrations in millpond wastewater solids.
  • To determine the optimal conditions for lead extraction using a toluene-HDEHP mixture.

Main Methods:

  • Solvent extraction was employed using toluene and a toluene-di-(2-ethyl-hexyl) phosphoric acid (HDEHP) mixture.
  • The influence of HDEHP concentration, contact time, and solvent volume on lead extraction was evaluated.
  • Toxicity Characteristic Leaching Procedure (TCLP) tests were performed on treated and untreated samples.

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Main Results:

  • Toluene alone was ineffective for lead extraction.
  • The toluene-HDEHP mixture demonstrated effective lead removal from solid foundry waste.
  • Optimal HDEHP concentration was found to be between 0.05 to 0.1 mol/l.
  • A contact time of 0.5 hours was sufficient for efficient leaching.
  • Treated samples showed significantly lower leachable lead content compared to untreated samples.

Conclusions:

  • Solvent extraction with a toluene-HDEHP mixture is a highly effective method for reducing lead content in millpond wastewater solids.
  • The process is efficient, with optimal conditions identified for practical application in waste treatment.