Silica fouling in coal seam gas water reverse osmosis desalination,Environmental Science: Water Research & Technology

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Silica fouling in coal seam gas water reverse osmosis desalination
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2017-06-07 00:00:00 , DOI: 10.1039/c7ew00128b
L. Lunevich _{1,

2,

3,

4,

5} , P. Sanciolo _{1,

2,

3,

4,

5} , N. Milne _{5,

6} , S. R. Gray _{1,

2,

3,

4,

5}

Affiliation

Silica fouling was studied in RO desalination of high salinity (30–60 g L⁻¹ as NaCl) coal seam gas (CSG) water for a range of silica concentrations, pH conditions and dissolved aluminium concentrations. Silica fouling patterns and the effect of various residual dissolved aluminium concentrations on silicate scale formation were recorded. The permeate flux decline data collected during each RO experiment showed that the deposition of the foulant layer on the membrane surface formed much faster in higher salinity and higher silica concentration water (∼50 mg L⁻¹) in the presence of elevated concentrations of dissolved aluminium (7.4–27.7 mg L⁻¹). It was found that the presence of elevated concentrations of dissolved aluminium reduces silica solubility to as low as 60–48 mg L⁻¹, leading to rapid aluminium-silicate deposition on the RO membrane surface. A mechanism of aluminium silica formation is discussed.

中文翻译：

煤层瓦斯水中的二氧化硅结垢反渗透脱盐

在高盐度（30–60 g L ^-1作为NaCl）煤层气（CSG）水的RO脱盐过程中，研究了二氧化硅的结垢情况，分析了一系列的二氧化硅浓度，pH条件和溶解的铝浓度。记录二氧化硅结垢模式以及各种残留的溶解铝浓度对硅酸盐结垢形成的影响。在每个反渗透实验期间收集的渗透通量下降数据表明，在较高的盐度和较高的二氧化硅浓度的水（〜50 mg L ^-1）下，在存在较高浓度的溶解铝的情况下，污垢层在膜表面上的沉积形成要快得多。（7.4–27.7毫克L ^-1）。发现增加浓度的溶解铝的存在将二氧化硅溶解度降低至低至60–48 mg L ^-1，从而导致RO膜表面迅速沉积铝硅酸铝。讨论了铝硅酸盐形成的机理。

更新日期：2017-06-07

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