Waste Disposal Study. Evaluation of Methods to Recover Reusable Chemicals from Evaporated Photowastes.
Abstract
The feasibility of recovering usable chemicals from evaporated photoprocessing wastes was studied. About 50-70% of the evaporated waste consists of sodium thiosulfate and sodium sulfite. Recovery of thiosulfate and sulfite was achieved via solubilization and either a combination of crystallization and subsequent barium precipitation of these desired sulfur salts, or direct barium precipitation. The barium salts could then be converted to the soluble sodium thiosulfate and sodium sulfite by action of sodium carbonate. Recovery efficiencies to 90% were achieved. Maximum yields were obtained when the sodium thiosulfate was greater than 50% of the waste, and water was used as the solubilizing agent. For wastes containing quantities lower than this concentrate, sodium hydroxide was the solvent of choice. The latter allowed separation of sulfite from thiosulfate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1976
- Accession Number
- ADA031767
Entities
People
- George A. Lorenzo
- Thomas N. Hendrickson