Wet Scrubbers

Wet scrubbers capture acid gas molecules onto water droplets; sometimes alkaline agents are added in small amounts to aid in the reaction (see Section 5.21). New designs report on removing over 99% of the hydrogen chloride and, in some cases, sulfur dioxide and over 80% of the dioxin, the lead, and mercury (Hershkowitz 1986). The disadvantages include the added cost to treat the waste-water produced, corrosion of the metal parts, and incompatibility with the fabric type of the particulate control device. However, wet scrubbers collect gases as well as particulates, especially sticky ones.

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