Some observations on the considerable variability of silt density index results due to equipment, filter and operator variables

The silt density index or similar fouling index is used extensively in the reverse osmosis industry as a practical guide to feedwater fouling potential. Some membrane manufacturers use silt density index results as the basis for their membrane guarantees. However, the empiricl nature of the theory b...

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Bibliographic Details
Published in:Desalination 1987, Vol.61 (3), p.201-210
Main Author: Walton, N.R.G.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Membrane separation (reverse osmosis, dialysis...)
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Summary:The silt density index or similar fouling index is used extensively in the reverse osmosis industry as a practical guide to feedwater fouling potential. Some membrane manufacturers use silt density index results as the basis for their membrane guarantees. However, the empiricl nature of the theory behind the test and the large potential for the both random and systematic errors to occur, suggest that the test conditions should be more rigorously specified to reduce the very substantial error potential, from both equipment and procedural variations. This paper draws onthe results and experiences of the author in conducting and supervising more than 20,000 silt density index test over the past few years at various reverse osmosis plants in the Middle East and highlights some of the more important variables inherent in the silt density index test method and its equipment.
ISSN:0011-9164
1873-4464
DOI:10.1016/0011-9164(87)80019-X