Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1987-06-12
1988-01-05
Terapane, John F.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
B09B 100, G21F 900
Patent
active
H00004049
ABSTRACT:
Recovery and disposing of waste materials containing inorganic chemicals not be effected by incineration to meet environmental regulations as is the situation with waste organic materials. As long as the inorganic toxic materials are in some soluble form, they can pollute the environment, and, also, end up in the water supplies. Two different disposal methods are disclosed wherein one method is effective for removing the insoluble inorganic salts by converting them into mesylates by reaction with methanesulfonic acid or with methanedisulfonic acid. Most mesylate salts are highly soluble in aqueous and certain organic systems. As an illustration, 1.0 part of silver mesylate or 2.0 parts of stannous mesylate or lead(II) mesylate will dissolve in 1.0 part of water at room temperature. This unique solubilizing property offers the ability of leaching such toxic metal contaminants as lead, cadmium, etc. from sewage sludge. The metal salts can thus be recovered and recycled. The other method relates to preparing the waste material for a safe burial without concern of contaminating the environment. This method is achieved by the following procedure: any acidic waste inorganic material is neutralized using a slurry of slaked lime. The neutralized material is then combined with the remainder of the waste material. The waste material is transferred to a polyethylene bag which is used to line the inside of a container. The waste material is then placed in the polyethylene bag, and mixed with enough sand and portland cement to produce a mixture that will harden overnight. The resulting block of concrete, contained within the polyethylene bag, can be buried safely without concern of contaminating the environment.
Bush Freddie M.
Garvin, Jr. John C.
Terapane John F.
The United States of America as represented by the Secretary of
Wolffe Susan
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