Effect of coagulant basicity on virus removal from water by polyferric chloride
Effect of coagulant basicity on virus removal from water by polyferric chloride
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DOI：
10.2166/aqua.2016.104
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发表时间：
2016-06
影响因子：
4.3
通讯作者：
N. Shirasaki;T. Matsushita;Y. Matsui;T. Marubayashi
中科院分区：
文献类型：
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作者：
N. Shirasaki;T. Matsushita;Y. Matsui;T. Marubayashi
研究了混凝剂碱度对聚合氯化铁去除河水中噬菌体的影响。采用碱滴定法（在FeCl 3溶液中加入NaOH）制备了3种碱度（碱度0.9-2.1）的PFC，并与FeCl 3（碱度0）的PFC进行了病毒去除效果的比较。在pH 6和pH 8下，PFCs的病毒去除效率等于或小于FeCl 3。这表明，与铝基凝结剂不同，增加铁基凝结剂的碱度不会提高病毒去除效率。此外，单体铁（III）物种在全氟化碳的相对丰度下降，而沉淀的铁（III）物种的增加，随着碱度的增加，与ferron方法评估。胶体电荷密度也随着碱度的增加而降低。因此，很可能单体铁（III）物质丰度的降低导致胶体电荷密度的降低，从而降低了病毒去除效率。因此，开发具有增加的病毒去除效率的新型铁基凝结剂可能不可能通过简单地增加凝结剂的碱度。
We investigated the effect of coagulant basicity on bacteriophage removal from river water by polyferric chloride (PFC). PFC at three basicities (basicity 0.9–2.1) was prepared by means of base titration (NaOH was added to ferric chloride (FeCl3) solution) and the virus removal efficiencies of those PFCs were compared with that of FeCl3 (basicity 0). The virus removal efficiencies of the PFCs were equal to or less than that of FeCl3 at both pH 6 and pH 8. This suggests that, unlike aluminum-based coagulants, increasing the basicity of iron-based coagulants does not improve virus removal efficiency. Furthermore, the relative abundance of monomeric iron(III) species in the PFCs decreased, whereas that of precipitated iron(III) species increased with increasing basicity, as assessed with a ferron method. Colloid charge density also decreased with increasing basicity. Therefore, it is likely that the reduction in the abundance of monomeric iron(III) species led to the reduction in colloid charge density, which then reduced virus removal efficiency. Thus, the development of novel iron-based coagulants with increased virus removal efficiency may not be possible by simply increasing the basicity of the coagulant.