Calgon Corporation

Calgon Carbon Corporation

Norman J Wagner

Rabindra K Sinha

Charles K Polinsky

Ronald S Joyce

K Raman Venkatesh

Eve R Cobes

Stephen D Cifrulak, Sr

Dale Lee Jennings

S David Cifrulak

A process for concentrating and destroying the perchlorate and nitrate anions present in ground water and drinking water sources is disclosed. In the process, the perchlorate and nitrate anions present in feed water are concentrated into a much smaller effluent stream. A typical process configuration involves using a continuous contacter apparatus known as ISEP wherein the perchlorate present in feed water is adsorbed on to an ion-exchange resin resulting in a perchlorate-free treated water. The ISEP unit also incorporates a regeneration zone where the adsorbed perchlorate is effectively removed from the resin using relatively low volumes of concentrated brine solution as the regenerant. The waste from the ISEP unit is a concentrated brine solution containing perchlorate and other anions that may be present in the feed stream. This waste stream from the ISEP unit is treated by a combination of: i) bioreactor or a catalytic reactor that removes perchlorate and nitrate (if present) anions ii) sulfate removal (if needed) by nanofiltration or other established methods and iii) filters and a disinfectant system to render the brine stream re-usable. The resulting stream is recycled back into the process. The entire process results in a very small waste stream that needs disposal. The process can be applied to feed water streams containing either perchlorate alone or perchlorate and other anions such as nitrate, sulfate and bicarbonate.

Process for the removal and destruction of perchlorate and nitrate from

Gas streams contaminated with acid and acid precursor gases and vapors are purified by contacting the gas streams with activated carbon impregnated with sodium hydroxide.

Removal of acidica contaminants from gas streams by caustic impregnated

Removal of acidic contaminants from gas streams by caustic impregnated

Insulation members having spaced apart walls, and at least a partial vacuum in the chamber defined by the walls are filled with activated carbon. The filling is accomplished under vacuum conditions, and activated carbon, degassed and having a density of greater than 0.3 grams/cm.sup.3 is employed to at least partially fill the chamber.

Method of preparing activated carbon for flow in a vacuum

An improved process for the removal of malodorous sulfur compounds, for example H.sub.2 S and methyl mercaptan, from gas streams containing oxygen in which a bed of activated carbon treated with PbOAc, NaOH and moisture is used to remove said compounds. The treatment, which may also be combined with regeneration of the activated carbon, is effected, typically, by applying to the carbon one bed volume of dilute (4-6%) NaOH and PbOAc solution, draining and drying with 50-100% R.H. air.

Dual impregnated activated carbon for improved removal of malodorous

An improved process for the removal of malodorous compounds, especially sulfur-containing compounds, for example H.sub.2 S and methyl mercaptan, from gas streams containing oxygen in which a bed of activated carbon treated with NaOH and moisture is used to remove said compounds. The treatment, which may also be combined with regeneration of the activated carbon, is effected, typically, by applying to the carbon one bed volume of dilute (4-6%) NaOH solution, draining and drying with 50- 100% R.H. air.

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Pittsburgh, PA, United States of America

Norman J Wagner