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Fredrick Cottrell first used wet electrostatic precipitators (ESPs) in 1910 to control acid mist emissions at a smelting operation in Selby, Calif. Since then, wet ESPs have been a mainstay of the sulfuric acid mist manufacturing industry, used at pyrometallurgical smelters and acid regeneration plants worldwide.
Eco-friendly products are everywhere—but are they truly sustainable or just clever marketing? This article uncovers what really makes a product green.
