Pretreatment and the effect of cations and anions on prevention of silica fouling
Pretreatment and the effect of cations and anions on prevention of silica fouling
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DOI：
10.1016/s0011-9164(01)00297-1
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发表时间：
2001-09
期刊：
影响因子：
9.9
通讯作者：
R. Sheikholeslami;I. Al-Mutaz;T. Koo;A. Young
中科院分区：
文献类型：
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作者：
R. Sheikholeslami;I. Al-Mutaz;T. Koo;A. Young
二氧化硅是苦咸水淡化过程中的主要污染物之一。它的存在限制了水的回收，此外一旦形成污垢，去除和清洁几乎是不可能的。因此，我们的目标是从一开始就防止二氧化硅结垢。许多复杂因素之一是水中存在的各种阳离子和阴离子对二氧化硅聚合的影响。通常，在实际的脱盐步骤之前有一个预处理阶段，用于尽可能多地去除二氧化硅。了解大多数主要阳离子和阴离子对聚合的影响非常重要，因此调整预处理阶段以强调去除最麻烦的组分。这项研究是针对预处理阶段量身定制的，研究了在批量测试定容反应器中，在 Ca 和 Mg 存在下以及不同 pH 值和浓度下二氧化硅去除和二氧化硅聚合的化学过程。在现场试验中还研究了通过增加 pH 值和添加石灰、苏打灰和铝酸钠来去除二氧化硅的有效性。
Silica is one of the major foulants in desalination of brackish water. Its presence limits the water recovery and in addition once foulant is formed, the removal and cleaning is almost impossible. Therefore, the aim is to prevent silica fouling from the inception. One of the many complicating factors is the effect of various cations and anions present in the water on silica polymerization. Usually, there is a pretreatment stage for removing as much silica as possible prior to the actual desalination step. It is of great importance to know the effect of most predominant cations and anions on the polymerization and hence tailoring the pretreatment stage to emphasize the removal of most troublesome components. This study is tailored towards pretreatment stage and addresses the chemistry of silica removal and polymerization of silica in presence of Ca and Mg and at various pH and concentrations in batch tests constant volume reactors. Also the effectiveness of silica removal by increase in pH and addition of lime, soda ash, and sodium aluminate in field tests have been investigated.