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Adsorption characteristics of haloacetic acid in drinking water by granular activated carbon

Views: 0     Author: Site Editor     Publish Time: 2024-03-07      Origin: Site

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Activated carbon treatment processes are widely used to control toxic trace organic matter in drinking water. GAC has its own advantages for the treatment of haloacetic acid in drinking water (no by-products are generated). Granular activated carbon (GAC) is used to treat trichloroacetic acid (TCAA) and dichloroacetic acid in the by-product halohexanoic acid of drinking water disinfection.

(DCAA) adsorption characteristics were studied and compared. Under single substrate conditions, the adsorption isotherm of haloacetic acid by activated carbon is most consistent with the modified Freundlich equation. When the concentration is less than 200 ug/L, the adsorption of haloacetic acid by activated carbon basically behaves as a single layer. Activated carbon basically exhibits single-layer adsorption for haloacetic acid. When the dosage of activated carbon was 1600 mg/L, the removal rates of TCAA and DCAA by GAC reached 98.49% and 98.01% respectively. The adsorption capacity of activated carbon for TCAA is higher than that of DCAA. When the equilibrium concentration is 0.3umoI/L, the molar adsorption capacity ratio of the two is 1:17:1. Acidic conditions are conducive to the adsorption of haloacetic acid by activated carbon. Under multi-substrate coexistence conditions, there is competitive adsorption between the two haloacetic acids. Compared with single substrate conditions, the adsorption of TCAA by activated carbon is less affected than DCAA. At the same time, the adsorption rate comparison shows that the adsorption rate of DCCA on activated carbon is faster.


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