| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 642574 | Separation and Purification Technology | 2011 | 8 Pages |
The coagulation behavior, residual aluminum ratio of three PAC coagulants as well as content and proportion of different residual Al speciation during the treatment of a specific surface water were investigated in this paper. Experimental results suggested that surface adsorption and entrapment effect worked effectively in turbidity removal regarding this specific water. PAC20 was appropriate to remove hydrophilic natural organic matter (NOM), while PAC15 and PAC23 were appropriate to remove hydrophobic fraction NOM. PAC, especially PAC20, could reduce the content of total dissolved Al and dissolved monomeric Al with comparatively higher toxicity. PAC20 showed lower concentration for every residual Al species. The majority of total residual Al existed in the form of unsoluble particulate Al (about 62–93% for PAC15, 65–92% for PAC20 and 54–78% for PAC23). Among total dissolved Al in the effluent treated with PAC15 and PAC23, dissolved organically-bound Al was almost the major speciation (about 40–92% for PAC15 and 37–86% for PAC23). There existed no dissolved organically-bound monomeric Al in purified water treated with three PAC samples. Residual Al ratio of PAC varied in the following order: PAC15 > PAC23 > PAC20. Besides, Al speciation in coagulants likely remained in treated water at lower dosage.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Al separation was conducted in PAC (with various B value) coagulated surface water. ► Five Al species were separated and measured in purified water by PAC coagulation. ► Other Al speciation could be achieved through substraction. ► OH/Al and PAC dosage effect on coagulation performance and Al species were studied. ► Others were conducted in terms of Al speciation proportion and residual Al ratio.
