Application of a reactive adsorbent-coated support system for removal of mercury(II)
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abstract
2016 Elsevier B.V. This study investigated removal of mercury by a reactive adsorbent-coated support (RACS) system under different pH values and hydraulic retention times (HRT), in the presence or absence of salts (nitrate and sulfate) or humic acids (HAs). The RACS system consists of pyrite-coated sand that was formed by electrostatic attraction and the pyrite was synthesized to near nano-scale. Column kinetics for mercury removal were examined by the Thomas model and Yan model with Yan model predicting data better than Thomas model. The pH of feed solutions largely affected the removal of mercury. As the pH decreased, the breakthrough curves were shifted to the left, indicating removal capacity of mercury decreased. Also, the steepness of the breakthrough curves increased, which indicates faster removal kinetics at low pH. At low HRT or with salts, the removal capacity of mercury decreased but faster kinetics was observed. HAs slowed the removal of mercury, but increased the removal capacity for mercury. The results of this study could provide fundamental information for a feasible scale-up of the column to produce high quality water from mercury-contaminated water with more stable residuals for disposal.
