Constructive Engineering of Large Reverse Osmosis Desalination Plants by Olabarria Pedro Maria Gonzalez

Author:Olabarria, Pedro Maria Gonzalez
Format: epub
Publisher: Chemical Publishing Company
Published: 2015-04-02T16:00:00+00:00

Figure 9.1. Detail of a spiral wound RO membrane.

Feed water enters the flow path provided by the spacers, at the upstream end. Due to the pressure supplied by a high pressure pump, a portion of the feed water is forced through the membrane. The water that does not pass through the membrane, plus the dissolved and suspended solids, exit the element at the downstream end of the flow path provided by the sheets of spacer material.

The water which passes through the membrane travels in the water carrier material inside each envelope and is collected in a central perforated tube. Figure 9.2 illustrates two envelopes, with two sheets of permeate water carrier attached to a perforated permeate tube.

Thin film membranes differ from asymmetric membrane. The salt rejecting layer and the porous support layers are made of different materials. The support material is a uniformly porous material (polysulfone) and the backing material (polyester). The salt rejection material is manufactured of polyamide.

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