Patents Assigned to Waste Management of Illinois, Inc.
  • Process for disposal of arsenic salts
    Patent number: 4118243
    Abstract: Arsenic-containing waste materials comprising water-soluble arsenic salts are processed to a product which comprises water-insoluble arsenic salts by reacting the same in an aqueous system with sulfuric acid and calcium hydroxide in the presence of sulfate ions and ferrous and/or ferric ions, and thereafter curing the system to solid form.The process can be practiced with conventional waste materials without preliminary special processing, and provides a product which can be easily handled and is amenable to secure landfill disposal.
    Type: Grant
    Filed: September 2, 1977
    Date of Patent: October 3, 1978
    Assignee: Waste Management of Illinois, Inc.
    Inventor: Mahendra D. Sandesara