Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1996-05-21
1998-06-23
Cintins, Ivars
Liquid purification or separation
Processes
Ion exchange or selective sorption
205287, 210677, 210688, 210913, C02F 128
Patent
active
057700907
ABSTRACT:
A waste water stream containing a heavy metal such as chromium, zinc, copper, and the like is directed from a source after pH adjustment to a tank containing adsorption material in the form of granular activated carbon. A waste water stream is directed to the tank in either an upward or downward flow mode. The heavy metal is adsorbed onto the surface of the adsorption material which is pretreated to an initial pH in the range between about 1.5 to 2.5. The water stream free of the metal contaminant is directed to an effluent tank for safe discharge. Thereafter a stripping solution preferably containing sulfuric acid is circulated through the tank to remove the adsorbed metal for the adsorption material. The metal is carried by the stripping solution from the tank to an electrolytic metal recovery unit. The unit includes a cathode terminal and the stripping solution passes through a voltage potential resulting in electrolytic deposit of the heavy metal onto the cathode terminal. The stripping solution free of the heavy metal is returned to a tank for reuse in the adsorption process. The cathode terminal is removed from the metal recovery unit to allow recovery of the metal for reuse.
REFERENCES:
patent: 4652352 (1987-03-01), Saieva
Bowers et al., Proq. Wat. Tech., "Activated Carbon Processes for the Treatment of Chromium (VI)-Containing Industrial Watewaters", vol. 12, pp. 629-649 (1980).
Landrigan et al. National Technical Information Service, "Removal of Chromium from Plating Rinse Water Using Activated Carbon", EP-570/2-75-055, pp. 1-43 (1975).
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