Standard Practice for Calculation and Adjustment of the Stiff and Davis Stability Index for Reverse Osmosis

Importancia y uso:

5.1 In the design and operation of reverse osmosis installations, it is important to predict the calcium carbonate scaling properties of the concentrate stream. Because of the increase in total dissolved solids in the concentrate stream and the differences in salt passages for calcium ion, bicarbonate ion, and free CO₂, the calcium carbonate scaling properties of the concentrate stream will generally be quite different from those of the feed solution. This practice permits the calculation of the S & DSI for the concentrate stream from the feed water analyses and the reverse osmosis operating parameters.

5.2 A positive S & DSI indicates the tendency to form a calcium carbonate scale, which can be damaging to reverse osmosis performance. This practice gives procedures for the adjustment of the S & DSI.

Subcomité:

D19.08

Referida por:

D6161-19, D3739-19, D4472-23

Volúmen:

11.02

Número ICS:

71.120.99 (Other equipment for the chemical industry)

Palabras clave:

calcium carbonate; membrane scaling; reverse osmosis (RO); stability index for RO; Stiff and Davis Stability Index (S & DSI) ;