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首页> 外文期刊>Separation and Purification Technology >Enhancement of flocculation and shear resistivity of bentonite suspension using a hybrid system of organic coagulants and anionic polyelectrolytes
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Enhancement of flocculation and shear resistivity of bentonite suspension using a hybrid system of organic coagulants and anionic polyelectrolytes

机译：使用有机凝结剂和阴离子聚电解细胞的杂交系统增强膨润土悬浮液的絮凝和剪切电阻率

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摘要

In this study, the influence of the hybrid coagulation-flocculation system on the flocculation and shear resistivity of bentonite suspension has been investigated. Two short-chained coagulants, polyamine and polyDADMAC, accompanied with low and high Molecular Weight (Mw) long-chained anionic Polyacrylamide (PAM) flocculants have been used to enhance the size and mechanical properties of the produced flocs. Four characterization techniques were used as evaluation criteria of degree of flocculation including turbidity, zeta potential (zeta), floc size analysis and rheology. Optimum dosages between 5 and 10 mg/L were obtained for flocculants and between 20 and 30 mg/L for coagulants in hybrid systems. Compared to single systems, hybrid systems performed exceptionally well. Removal efficiency of 99% was achieved using hybrid systems producing water with turbidity as low as 1.05 NTU. Although differences were insignificant in the treatment quality, significant improvement was achieved in floc size and rheological behavior. Hybrid systems were able to produce large flocs of more than 400 mu m, five times bigger than flocs from the single cationic coagulant systems. Most importantly, rheological testing of produced slurries revealed the remarkable advancement achieved by hybrid systems. Hybrid systems were able to increase the elastic modulus (G') by more than ten times resulting from the compacted flocs present in the system. Furthermore, resistivity toward shear and oscillations were improved. Ultimately, hybrid systems have surpassed the single cationic systems by achieving slightly better treatment besides producing larger, denser and more resistive flocs. Generally, polyDADMAC performed better than polyamine in hybrid systems. The combination of polyDADMAC with high Mw PAM gave the best separation as well as the largest flocs, while the combination with low Mw PAM resulted in the best rheological properties.
机译：在该研究中，研究了杂化凝血 - 絮凝系统对膨润土悬浮液的絮凝和剪切电阻率的影响。伴随着低和高分子量（MW）长链阴离子聚丙烯酰胺（PAM）絮凝剂的两种短链凝结剂，多胺和多层粘蛋白（PAM）絮凝剂用于增强所产生的絮凝物的尺寸和机械性能。四种表征技术被用作絮凝度的评价标准，包括浊度，Zeta电位（Zeta），絮凝尺寸分析和流变。在絮凝剂和20至30mg / L之间获得5-10mg / L之间的最佳剂量，用于杂交系统中的凝结剂。与单系统相比，混合系统非常良好地进行。使用用浊度为低至1.05 NTU的杂交系统实现99％的去除效率为99％。尽管在治疗质量方面的差异微不足道，但絮凝尺寸和流变行为实现了显着的改善。混合系统能够产生超过400μm的大絮状物，比来自单阳离子凝结剂系统的絮凝物大的五倍。最重要的是，产生的浆料的流变测试揭示了混合体系实现了显着的进步。混合系统能够通过系统中存在的压实絮凝物增加超过十倍的弹性模量（g'）。此外，改善了对剪切和振荡的电阻率。最终，除了产生较大，更密集和更电阻絮凝物之外，混合系统通过实现稍好的处理而超越了单阳离子系统。通常，多达马加比混合系统中的多胺进行。 PolydadMac与高MW PAM的组合给出了最佳的分离以及最大的絮凝物，而具有低MW PAM的组合导致最佳流变性质。

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