Ranking of antiscalant performance for gypsum scale suppression in the presence of residual aluminum

被引：61

作者：

Shih, Wen-Yi

Gao, Junbo

Rahardianto, Anditya

Glater, Julius

Cohen, Yoram ^{[1
]}

Gabelich, Christopher J.

机构：

[1] Univ Calif Los Angeles, Chem & Biomol Engn Dept, Los Angeles, CA 90095 USA

[2] Metropolitan Water Dist So Calif, La Verne, CA 91750 USA

来源：

DESALINATION | 2006年 / 196卷 / 1-3期

关键词：

aluminum; gypsum; mineral salt scaling; antiscalant; reverse osmosis; pretreatment;

D O I：

10.1016/j.desal.2006.04.001

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

An approach to ranking antiscalant effectiveness for gypsum scale suppression using combined bulk crystallization and membrane scaling diagnostic tests was explored with a focus on the adverse impact of residual aluminum in dissolved (Al3+) and as colloidal species on gypsum scale suppression. Five commercial antiscalants were ranked based on the crystallization induction time as determined in a well-mixed crystallization vessel with a back-light scattering turbidity meter to monitor gypsum formation. The presence of aluminum, even at trace levels (up to 100 mu g/L), significantly reduced the crystallization induction time, thereby reducing antiscalant effectiveness. For a given antiscalant dose, the crystallization induction time decreased with increasing total aluminum concentration according to a log-linear relationship. Although the above qualitative behavior was similar for the tested commercial anti-scalants, the adverse impact of aluminum on antiscalants effectiveness differed markedly among the different antiscalants. Diagnostic scaling tests in a plate-and-frame RO module demonstrated antiscalant performance ranking of the same order as that obtained based on bulk crystallization induction time measurements.

引用

页码：280 / 292

页数：13

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