| A novel ion exchange system regenerated using a strong electrical field was proposed andinvestigated for the removal and recovery of Cr(Ⅵ) from wastewater. It may find its wideindustrial applications due to its high purification efficiency, good heavy metals recoverywithout chemicals consumption, quick regeneration, and simple structure.Research work focused mainly on the resin slection, the operational variable effects, andthe Cr(Ⅵ) recovery. Experimental results showed that it is feasible to regenerate resins using astrong electrical field. The macro-porous weak-base (D301) resin was chosen for the novel ionexchange system because of its satisfactory efficacy for Cr(Ⅵ) removal and recovery, with lowpower consumption required. The optimal operational conditions for the regeneration were: a DIwater temperature of 10℃, a flowrate of 1.2 L/h (a HRT of 2.4 min), a current of 1.5 A (acurrent density of 375 A/m~2), and a regenerateion time of 2 h. The average concentration ofCr(Ⅵ) in the regeneration solution was 723.5 mg/L, and 44 percent of the resin was regenerated,with a power of 8.44 kWh/molCr(Ⅵ) being consumed. The resin after regenerationdemonstrated good performance for Cr(Ⅵ) removal. The Cr(Ⅵ) concentration was reducedfrom initial 50 mg/L to lower than 0.5 mg/L after treatment. The regeneration solution could beconcentrated further to a level of 14.55 g chromic acid/L by ED, and the total powerconsumption only increased to 9.30 kWh/molCr(Ⅵ). |
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