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Comment PDF Water Treatment

Water Treatment Technologies

By Chemical Engineering |

Removing contaminants from water is a critical operation in the chemical process industries (CPI). The goal of treatment processes is to reduce the relevant contaminants to the extent required by the application. This column provides information on major categories of contaminants and on pretreatment, primary treatment and posttreatment technologies (Tables 1 and 2). Pretreatment Pretreatment technologies protect primary treatment equipment from fouling and chemical degradation. Bed filters. Bed filters contain a porous bed of inert, uniformly sized particles, such as coal and sand. Typical bed filters can remove suspended solids down to 10 microns. Cartridge filters. Cartridge filters are thick-walled tubes constructed of synthetic polymers. In string-wound constructions, the material is wound around the core in a pattern that creates a tortuous path through which the water must flow. Other constructions use nonwoven materials. Bag filters. Bag filters usually consist of bags created of nonwoven fabrics, supported in housings. Adsorptive filters. Activated carbon filters are available in either bed or cartridge configurations. The highly porous material can remove dissolved gases, volatile hydrocarbons and dissolved organic…
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