Adsorption of Trichloroethylene by Fibrous and Granular Activated Carbons in the Presence of Natural Organic Matter
نویسندگان
چکیده
Adsorption by granular activated carbon (GAC) has been widely employed to remove various synthetic organic contaminants (SOCs) from water supplies [1]. A factor complicating the design and effectiveness of activated carbon for the treatment of potable waters is the presence of naturally occurring dissolved organic matter (NOM) in natural waters. The presence of NOM can significantly reduce the efficiency of activated carbon processes, by competing with targeted SOCs, and thus reducing SOC uptake and rate of adsorption. In fixed-bed reactors, the mass-transfer zone of NOM components can move more rapidly than that of the targeted SOCs. Therefore, at some positions within the bed, the NOM adsorbs ahead of the SOC, and fouls or “preloads” the carbon. It has been shown that the preloading phenomenon can significantly reduce the performance of fixed bed adsorbers [2,3]. Ideally, an activated carbon that exhibits maximum SOC removal but minimum NOM uptake is expected to provide a longer service time reducing the overall cost of water treatment process.
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