|
|
|
| The effect of sodium alginate on the coagulation rate and flocs formation of modified clay |
|
|
|
|
Abstract In present study, we used sodium alginate as a model compound to investigate the effect of algal organic matters (AOMs) occurred during algal blooms on the coagulation rate and flocs formation of modified clay. The flocculation kinetics of modified clay particles at various concentrations of sodium alginate solutions were studied. And the flocs fractal dimension was calculated by image analysis software to assess the morphologic features of the flocs semi-quantitatively. Our results indicate that the coagulation rate of modified clay and the fractal dimension of flocs are lower than that of control when the concentration of sodium alginate is below 10mg/L. In the range of 10-100mg/L, sodium alginate can improve the coagulation rate of modified clay; the flocs fractal dimension and flocs strength increase steadily to a peak and then decrease. The optimum concentration of sodium alginate is 50mg/L, along with the maximum cogulation rate of 44.13 and the flocs dimension of 1.6823 respectively. While, the flocs fractal dimension and coagulation rate decreased when the concentration of sodium alginate is higher than 100mg/L,resulting in subsequent increase of the flocs voidage.
|
|
Received: 10 June 2012
|
|
|
|
|
|
|
