Process for removing mercury from industrial and clinical waste

Details Process for removing mercury from industrial and clinical waste Process for removing mercury from industrial and clinical waste

1999-11-01

2000-12-26

Simmons, David A.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210694, 210756, 210759, 210806, 210807, C02F 128

Patent

active

061653667

ABSTRACT:
A process is described for the removal of mercury present at levels of 1-5000 ppb in waste water discharged from clinical research laboratories, industries and hospitals. The process involves preoxidation of the influent waste water with very small amounts of hypochlorite (16-100 ppm levels)or hydrogen peroxide, in a pretreatment tank. The waste water is then serially filtered through two pre filters and four carbon columns at a flow rate of 5 bedvolumes/hr. The preoxidation, prefiltration, organic removal, heavy metals removal (second column) and polishing stages (third and fourth) are important to achieve very low levels of mercury in the effluent. The last three columns contain activated coconut shell carbon impregnated with mercaptothiazoline . The three columns of the mercaptothiazoline impregnated carbon remove mercury and other heavy metals successively and reduce their levels in the influent to very low levels that is well below the enforced limit of 1 ppb. The last column could be also filled with MCT impregnated carbon fiber. Each of the columns are topped by a 0.5 foot layer of 0.5% carbon impregnated with chlorhexidine, butyl paraben and resorcinol monoacetate to prevent biofouling.

REFERENCES:
patent: 3974170 (1976-08-01), Campbell et al.
patent: 5755977 (1998-05-01), Gurol et al.
patent: 5868924 (1999-02-01), Nachtman et al.

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