Removal of fluoride from semiconductor wastewater by electrocoagulation-flotation.
作者： CY Hu , SL Lo , WH Kuan , YD Lee , None
DOI: 10.1016/J.WATRES.2004.11.034
关键词:
摘要: This work employs an anodic surfactant, sodium dodecyl sulfate (SDS), to improve the flotation performance of electrocoagulation-flotation (ECF) process treated fluoride containing semiconductor wastewater following calcium precipitation. The dissolved ions and CaF(2) particles in after precipitation were effectively removed ECF simultaneously. dosage SDS required for was much less than those dispersed air (DiAF) or (DAF) processes because can be collected by hydro-fluoro-aluminum flocs ECF. Thus, only served as a frother make bubbles tiny stable defluoridation process. interference co-existing anions overcome increasing SDS. optimum initial acidity is close concentration precipitation; amount SS dropped rapidly if exceeded optimal value surface charge increased. modified changing [Ca(OH)(2)]/[Ca(2+)](T) ratio appropriate approximately given acid dissociation constant hydrofluoric pH before
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