Enhanced Coagulation of Titanium Tetrachloride Aided by the Modified Compound Bioflocculant
Enhanced Coagulation of Titanium Tetrachloride Aided by the Modified Compound Bioflocculant
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DOI：
10.1061/(asce)ee.1943-7870.0000938
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发表时间：
2015-02
影响因子：
2.2
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中科院分区：
文献类型：
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摘要通过丙烯酰胺与二甲基二烯丙基氯化铵的接枝共聚，对复合生物絮凝剂(CBF)进行改性，将其命名为MCBF。考察了MCBF助凝剂与四氯化钛(TiCl4)对高、低分子量天然有机物(NOM)的去除效果。利用激光衍射仪对絮凝特性进行了研究。结果表明，单体成功地接枝到CBF上，大大提高了CBF的相对分子质量和Zeta电位。MCBF与TiCl4具有协同作用，促进NOM的去除，尤其是在低TiCl4剂量下。此外，使用MCBF作为助凝剂与TiCl4配合使用，可以显著提高絮体生长速度、尺寸、强度和破碎絮体的回收率。MCBF对TiCl4产生的絮体分维的影响取决于NOM性质。投加量对混凝性能和絮凝性能均有显著影响。
AbstractThe compound bioflocculant (CBF) was modified by graft copolymerization of acrylic amide and dimethyl diallyl ammonium chloride, and the novel copolymer was denoted as MCBF. The effect of MCBF used as coagulant aid with titanium tetrachloride (TiCl4) was investigated for both high and low molecule weight natural organic matter (NOM) removal. Floc characteristics were studied using a laser diffraction particle-sizing device. Results indicated that the monomers were successfully grafted onto the CBF, and the molecule weight and zeta potential of CBF were greatly improved. The MCBF with TiCl4 exhibited synergistic effect by promoting NOM removal, especially at low TiCl4 doses. Additionally, using MCBF as a coagulant aid with TiCl4 can significantly increase the floc growth rate, size, strength, and broken-floc recoverability. The effect of MCBF on fractal dimension of flocs generated by TiCl4 depended on NOM properties. Both coagulation performance and floc properties were significantly affected by d...