Abstract
In response to the performance limitations on the decolorization and removal of organic matter by dissolved ozone flotation process(DOF), anionic and cationic polyacrylamide (PAM) were used to regulate floc size of the natural organic matter represented by humic acid, and aerated flocs formed at different PAM concentration gradients were characterized by aerated floc size, two-dimensional fractal dimension and contact angle between flocs and microbubbles. In addition, the effects of anionic and cationic PAM concentration gradients on humic acid degradation and aerated floc size were studied, and binding mechanism among anionic and cationic PAM, flocs and microbubbles was discussed. The results indicated that PAM addition improved humic acid removal in DOF process, and aerated floc size, fractal dimension and contact angle increased. There was an optimal dosage for different kinds of PAM, at which the removal efficiency, aerated flocs size and contact angle were the largest, and fractal dimension was the smallest. Compared with the anionic PAM at its optimum dosage, the formed aerated flocs using cationic PAM were characterized as larger size, higher contact angle, smaller fractal dimension and better humic acid removal effect. In DOF system, favorable aerated floc size could be formed to improve the removal efficiency of humic acid by ameliorate the electrostatic interaction strength among PAM, flocs and microbubbles.
| Translated title of the contribution | Regulation of the size and interfacial physicochemical properties of flocs in dissolved ozone flotation |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 2102-2112 |
| Number of pages | 11 |
| Journal | Chinese Journal of Environmental Engineering |
| Volume | 13 |
| Issue number | 9 |
| DOIs | |
| State | Published - 26 Sep 2019 |
| Externally published | Yes |