Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1991-08-28
1992-12-08
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
210669, 210679, 210688, 210694, 210747, 431 2, C02F 900
Patent
active
051695340
ABSTRACT:
An improved process for disposal of aqueous hazardous waste is based on the finding that caustic-treated coal that is substantially hydrophilic and self-combusting can combine with contaminants present in water, including organic contaminants and metal ion contaminants. Contacting of the coal with contaminant-containing water results in the production of contaminant-containing coal and reduction of the content of contaminant in the water by at least about 80% by weight. When the contaminant-containing coal is burned in the presence of a slagging agent, the organic contaminants are destroyed by combustion and the metal ion contaminants are encapsulated in slag, for safe disposal. Several integrated treatment methods are disclosed for aqueous waste, such as ground water, based on this finding. The caustic-treated coal used in a process of the present invention can be subjected to several treatments, including washing steps for removing mineral matter and/or sulfur from the coal to yield caustic-treated coal with reduced mineral matter and sulfur content. Alternatively, the coal can be treated with a water-soluble primary or secondary amine and carbon disulfide in the presence of water of modify its surface.
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Cintins Ivars
Farber Michael B.
Goldstein Sol L.
TRW Inc.
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