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 floes formation of modified clay. The flocculation kinetics of modified clay particles at various concentrations of sodium alginate solutions were studied. And the floes fractal dimension was calculated by image analysis software to assess the morphologic features of the floes semi-quantitatively. Our results indicate that the coagulation rate of modified clay and the fractal dimension of floes 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 floes fractal dimension and floes 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 floes dimension of 1.6823 respectively. While, the floes fractal dimension and coagulation rate decreased when the concentration of sodium alginate is higher than 100mg/L,resulting in subsequent increase of the floes voidage.
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维普
万方数据
