Abstract
This study addressed the size and fractal dimensions of flocs coagulated from highly turbid raw water using polyaluminum chloride (PACl) as the coagulant. Large flocs with loose interior structures are preferred for removing turbidity and humic acid from water. The response surface method, with the Box-Behnken design of experiments, was used to elucidate the effects of pH, turbidity, alkalinity of suspension, doses of PACl, and humic acid on the characteristics of the flocs. Nondimensional correlations between the floc size and the fractal dimension of the coagulated flocs were derived by regression analysis. Graphical presentation facilitates the interpretation of the data obtained from the designed experiments. The variable that most affects the floc characteristics is the PACl dose. However, the "optimal" conditions that lead to large flocs are different from those that lead to loose flocs. A compromise must be made to generate satisfactory flocs from highly turbid raw water. The conclusion drawn from bench tests is applicable to extremely highly turbid stormwater obtained during storm Nari on September 16-19, 2001.
| Original language | English |
|---|---|
| Pages (from-to) | 19-42 |
| Journal | Separation Science and Technology |
| Volume | 39 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2005 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Coagulation
- Floc properties
- High turbidity waters
- Humic acid
- PACl
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