Liquid purification or separation – Processes – Including geographic feature
Patent
1991-09-30
1993-04-13
Silverman, Stanley S.
Liquid purification or separation
Processes
Including geographic feature
210751, 210912, 210911, 405128, 405129, 405263, 588236, 588256, C02E 1114, B09B 300
Patent
active
052020339
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.
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Chowdhury Ajit K.
Stanforth Robert R.
McCarthy Neil M.
RMT, Inc.
Silverman Stanley S.
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