Method and mixture for treating hazardous wastes
AssigneeRMT, Inc.
InventorRobert R. Stanforth
Life of this patent
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Abstract
A method of treating solid hazardous waste containing unacceptable levels of leachable metals such as lead and cadmium includes mixing the solid waste with an agent selected from the group consisting of reactive calcium carbonate, reactive magnesium carbonate and reactive calcium magnesium carbonate. After the solid waste and agent are mixed under conditions which support reaction between the agent and metals, the metals will be converted to nonleachable forms which are relatively stable under normal environmental conditions. If the solid waste material and agent are both dry when mixed, it may be beneficial to add water to facilitate the mixing of the solid waste and agent and the conversion of the metals into nonleachable forms.
Claims9
A method of treating solid hazardous waste containing unacceptable levels of leachable metals selected from the group consisting of lead and cadmium, the method comprising the step of mixing the solid waste with water treatment lime sludge including at least one agent selected from the group consisting of reactive calcium carbonate, reactive magnesium carbonate and reactive calcium magnesium carbonate, so that under conditions which support reaction between the agent and metals, the metals will be converted to nonleachable forms which are relatively stable under normal environmental conditions.
A non-hazardous solid waste mixture which may be safely disposed of in a landfill, comprising:
- (a) water treatment lime sludge including at least one agent selected from the group consisting of reactive calcium carbonate, reactive magnesium carbonate, and reactive calcium magnesium carbonate;
- and
- (b) a solid waste which prior to a reaction with said agent contains unacceptable levels of leachable metals selected from the group consisting of lead and cadmium, said lime sludge and solid waste being mixed together in quantities sufficient so that under conditions which support a reaction between the agent and the metals, the metals will be substantially converted to monleachable forms which are relatively stable under normal environmental conditions.
Dependencies are inferred from the claim text.