| 摘要 |
<p>A method for improved productivity for desalination by reverse osmosis (RO). The method includes an integrated membrane and chemical treatment process for increasing recovery based on permeate, defined as the ratio of permeate flow to feed flow, by reducing the effects of silica deposition or fouling. Saline feed water that requires RO desalination but that is high in silica concentration is first filtered with a particle removing filter, such as a microporous or ultrafiltration membrane filter, to remove suspended solids that may otherwise foul the RO membranes. A silica dispersant is introduced prior to the RO step. Some or all of the primary RO concentrate is preferably filtered by a microporous or ultrafiltration membrane to reduce dispersed silica concentration and the filtrate is further treated with RO. This microporous or ultrafiltration membrane can be either the same as used for pretreatment ahead of the RO or a separate MF or UF dedicated to only receive RO concentrate as its feed.</p> |
