Abstract
In order to understand the influence of Fe(III) on the filtration characteristics of polysaccharide fouling layer on membranes for drinking water treatment, this study selected alginate as a model polysaccharide, analyzed the filterability of the fouling layers formed from calcium alginate w/wo Fe(III), and quantitatively described the characteristics of the gel layers by using the permeability function and compressibility function. The results showed that calcium ions could aid alginate molecules to form a compact gel layer, which had high filtration resistance. Ferric ions and ferric (hydr)oxides (FeOx(OH)3-2x) particles coexisted in the alginate solution after the addition of ferric chloride, as ferric ions could quickly hydrolyze in water. A small amount of Fe(III) did not have significant effect on the filtration of the calcium alginate gel layer while increased amount of Fe(III) could improve the filterability because the gel layer structure had been changed by the ferric (hydr)oxides particles of higher concentration and/or size.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 3522-3528 |
| Number of pages | 7 |
| Journal | Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae |
| Volume | 35 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 6 2015 |
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Environmental Chemistry
- Environmental Science(all)