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首页> 外文期刊>Separation and Purification Technology >Comparative analysis on floc growth behaviors during ballasted flocculation by using aluminum sulphate (AS) and polyaluminum chloride (PACl) as coagulants
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Comparative analysis on floc growth behaviors during ballasted flocculation by using aluminum sulphate (AS) and polyaluminum chloride (PACl) as coagulants

机译：硫酸铝（AS）和聚铝氯化铝（AS）和聚铝氯化铝（AS）和聚氨铝（PACL）作为凝结剂的比较分析

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摘要

For enhancing the understanding of ballasted flocculation (BF) mechanisms, a series of BF tests were performed to explore the coagulant dosage and mixing intensity effects on floc growth behaviors and corresponding particle settling by using coagulants of aluminum sulphate (AS) or polyaluminum chloride (PACT). As expected, different coagulant dosages brought about distinct surface charge characteristics of micro-floc aggregates after either Al-based coagulant addition, thereby affecting the development of ballasted floc size. More specifically, the higher the coagulant dosage was, the more the cationic hydrolyzed-Al species were produced, leading to a requirement of more binding sites on the injected polymer for bridging between micro-flocs and ballasting agent (BA) particles, and accordingly, the degree to which BA particles had been incorporated into the aggregate matrix seemed to largely account for ballasted floc formation. Besides, floc aggregates formed after breakage appeared larger than those after maturation, especially at higher coagulant dosages, possibly caused by a stretched conformation of long polymer chains providing more binding sites available within a higher-shear suspension. In an operational sense, poor incorporation should be maximally eliminated, since this undesirable behavior could produce a greater number of resultant flocs with fewer or even no BA particles, thus worsening the settling performance. This research would be helpful for thoroughly understanding ballasted floc formation mechanisms in either water or wastewater treatment operations.
机译：为了提高对镇流絮凝（BF）机制的理解，进行一系列BF试验以探索凝结剂剂量和混合强度效应Floc生长行为和相应的颗粒沉降，通过使用硫酸铝（AS）或聚铝氯化物（PACT ）。正如预期的那样，在基于Al的凝结剂加法后，不同的凝结剂剂量带来了微小絮凝物的不同表面电荷特性，从而影响了镇流式絮凝尺寸的发展。更具体地，凝结剂剂量越高，制备阳离子水解 - Al种类越多，导致在微絮凝剂和压载剂（BA）颗粒之间桥接的注射聚合物上具有更多结合位点，因此， Ba颗粒已被掺入聚集基质中的程度似乎在很大程度上占压载絮状物形成。此外，在破损后形成的絮凝物显得大于成熟后的植物，特别是在较高的凝结剂剂量下，可能是由长聚合物链的拉伸构象引起的，在更高剪切悬浮液中提供更多的结合位点。在操作意义上，应最大地消除差的结合，因为这种不良行为可以产生更多数量的由较少甚至没有BA颗粒的合成絮状物，从而使沉降性能恶化。本研究将有助于在水或废水处理操作中彻底了解镇流式絮状机制。

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