The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 1993
Filed:
Sep. 30, 1991
Robert R Stanforth, Madison, WI (US);
Ajit K Chowdhury, Madison, WI (US);
RMT, Inc., Madison, WI (US);
Abstract
A method of treating solid waste in soil or solid disposed waste containing unacceptable levels of leachable metals, such as lead, cadmium, arsenic, zinc, copper and chromium, includes mixing the solid waste or soil in place with a phosphate source or a carbonate source or ferrous sulfate. After the solid waste and the additive are mixed, if needed an additional pH controlling agent is mixed into the soil or waste and additive. After the solid waste and additive and pH controlling agent are mixed under conditions which support reaction between the additive, pH controlling agent and metals, the metals will be converted to non-leachable forms which are relatively stable under normal environmental conditions. The treatment additives can be introduced and contacted with the soil or waste in any of the following techniques: spreading the additives on top of the soil or waste and mixing with a mechanical device, such as a rotary tiller, adding the treatment chemical through an infiltration gallery as a solution or slurry, injecting a soluble additive through injection nozzles or injection wells, and adding a treatment additive through a hollow-shaft auger and in-place mechanical mixing.