Abstract：Simulated low turbidity and micro-polluted water was used as raw water and aluminium sulfate was used as coagulant,the flocs growth process, two-dimensional perimeter fractal dimension (Dpf), specific surface and the relationship between flocs characteristics and coagulation efficiency under three common coagulation mechanisms (charge neutralization, bridging and sweep flocculation) were investigated. The results indicated that the highest growth rate S (0.951), stable flocculation index (FI) value (3.7%) and two-dimensional perimeter fractal dimension (1.588) of flocs were formed under bridging dominated the coagulation mechanism. Additionally, the flocs stick together in clumps with porous space in such condition and its specific surface was between that formed by sweep flocculation and charge neutralization as the following hierarchy: sweep flocculation (83.646m2/g)>bridging (98.808m2/g) >charge neutralization (116.046m2/g). The FI value, S and Dpf had a significant linear correlation with the turbidity removal efficiency, the correlation coefficient reaching up to 0.979、0.982 and 0.963, respectively. The flocs with higher specific surface and bigger adsorption capacity may be contributed to a higher organic matter removal.
邬艳, 杨艳玲, 李星, 周志伟, 王伟强, 苏兆阳. 三种常见混凝机理为主导条件下絮体特性研究[J]. 中国环境科学, 2014, 34(1): 150-155.
WU Yan, YANG Yan-Ling, LI Xing, ZHOU Zhi-Wei, WANG Wei-Qiang, SU Zhao-Yang. Study on flocs characteristics under three common dominant coagulation mechanisms. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(1): 150-155.
