05202033 is referenced by 68 patents and cites 25 patents.

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.

Title
In situ method for decreasing heavy metal leaching from soil or waste
Application Number
7/767520
Publication Number
5202033
Application Date
September 30, 1991
Publication Date
April 13, 1993
Inventor
Ajit K Chowdhury
Madison
WI, US
Robert R Stanforth
Madison
WI, US
Agent
Lathrop & Clark
Assignee
RMT
WI, US
IPC
B09B 3/00
C02E 11/14
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