Magazine article Science News

New Process Cleans NOx-Ious Air

Magazine article Science News

New Process Cleans NOx-Ious Air

Article excerpt

New process cleans NO.sub.x.-ious air

Nitrogen oxides (NO.sub.x.) are a mojor contributor to acid rain and smog ozone (SN: 4/30/88, p.276; 9/17/88, p.180). While many commercial technologies exist to scrub sulfur oxides (SO.sub.x.) from the gas stream exiting a fossil-fueled power plant's flue, available options for NO.sub.x scrubbing are limited and expensive. But a new process developed at Argonne (III.) National Laboratory can remove more than 70 percent of the NO.sub.x from coal-stack gases without affecting the ability of conventional flue-gas scrubbers to remove more than 90 percent of SO.sub.x.. And preliminary estimates suggest the cost of this NO.sub.x removal will be just half to one-tenth that of currently available NO.sub.x.-limiting technologies.

The new process adds a reagent -- such as the metal chelator, ferrous EDTA -- to the SO.sub.x.-removal solution used in conventional stack-gas scrubbers. …

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