文獻名： Experimental and modeling analysis of lignin derived polymer in flocculating aluminium oxide particles

作者： Minoo Ataie^a ; Kayte Sutherland^a ; Leila Pakzad^a ; Pedram Fatehi^ab

^a Green Processes Research Centre and Department of Chemical Engineering, Lakehead University, Thunder Bay, ON P7B 5E1, Canada

^b State Key Laboratory of Biobased Material and Green Papermaking/Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qilu University of

Technology (Shandong Academy of Sciences), Jinan, Shangdong Province 250353, China

摘要：This study involves the experimental evaluation of flocculation systems for aluminium oxide particles using a semi-natural flocculant, kraft lignin-acrylic acid (KL-AA) polymer, with sophisticated tools, such as focused beam reflectance measurement and vertical scanner analyzer. A novel statistical framework was also developed to model the experimental results, which led to a more in-depth analysis of shape and size of flocs in heterogeneous suspensions. The mathematical modeling of the generated results revealed that the polymer induced generally larger flocs with three different size regimes. The weak interaction of KL-AA and the particles generated the largest but loosely structured flocs (with the greatest deviation from a spherical shape) at pH 3. These flocs could not be recovered after de-flocculation/re-flocculation, they had the slowest settling performance and they made sediment with the lowest concentration at pH 3. The charge interaction and bridging mechanisms generated flocs with the largest recoverable size after de-flocculation/re-flocculation at pH 6. The generated flocs became more compact and spherical as pH increased in the system. Interestingly, with increasing salinity of the system, the polymer induced larger flocs with a less compact structure. The flocs seemed to be slightly stronger at higher salinity, they settled in faster pace, and they made more compact sediments.