New insights into silica scaling on RO-membranes

Andreas Kempter; Torben Gaedt; Volodymyr Boyko; Stephan Nied; Keith Hirsch

doi:10.1080/19443994.2012.715237

New insights into silica scaling on RO-membranes

Andreas Kempter, Torben Gaedt, Volodymyr Boyko, Stephan Nied, Keith Hirsch

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

The polymerization of silica in hard water was investigated by using different supersaturation levels of silica at pH 7 and 8. The results indicate a kinetically stable range up to ~400ppm [SiO₂] under the chosen conditions at pH 7, whereas no such range is present at pH 8. Additionally, polyvinylpyrrolidone and polyethers were tested for their silica inhibition capabilities. It was found that the performance is depending on molecular weight as well as dosage of the polymers, respectively. From these results, a mechanism for inhibition at pH 7 and 8 was suggested.

Original language	English
Pages (from-to)	899-907
Number of pages	9
Journal	Desalination and Water Treatment
Volume	51
Issue number	4-6
DOIs	https://doi.org/10.1080/19443994.2012.715237
State	Published - 2013
Externally published	Yes

Keywords

Antiscalants
Polymers
RO membranes
Scaling process
Silica polymerization
Silica scale

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10.1080/19443994.2012.715237

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title = "New insights into silica scaling on RO-membranes",

abstract = "The polymerization of silica in hard water was investigated by using different supersaturation levels of silica at pH 7 and 8. The results indicate a kinetically stable range up to ~400ppm [SiO2] under the chosen conditions at pH 7, whereas no such range is present at pH 8. Additionally, polyvinylpyrrolidone and polyethers were tested for their silica inhibition capabilities. It was found that the performance is depending on molecular weight as well as dosage of the polymers, respectively. From these results, a mechanism for inhibition at pH 7 and 8 was suggested.",

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AU - Kempter, Andreas

AU - Gaedt, Torben

AU - Boyko, Volodymyr

AU - Nied, Stephan

AU - Hirsch, Keith

PY - 2013

Y1 - 2013

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AB - The polymerization of silica in hard water was investigated by using different supersaturation levels of silica at pH 7 and 8. The results indicate a kinetically stable range up to ~400ppm [SiO2] under the chosen conditions at pH 7, whereas no such range is present at pH 8. Additionally, polyvinylpyrrolidone and polyethers were tested for their silica inhibition capabilities. It was found that the performance is depending on molecular weight as well as dosage of the polymers, respectively. From these results, a mechanism for inhibition at pH 7 and 8 was suggested.

KW - Antiscalants

KW - Polymers

KW - RO membranes

KW - Scaling process

KW - Silica polymerization

KW - Silica scale

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JO - Desalination and Water Treatment

JF - Desalination and Water Treatment

IS - 4-6

ER -

New insights into silica scaling on RO-membranes

Abstract

Keywords

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