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NEWater is produced by further purifying conventionally treated wastewater through microfiltration, reverse osmosis and ultraviolet radiation. The water is potable quality and can be added to drinking water supply reservoirs where it is withdrawn and treated again in conventional water treatment plants before being distributed to consumers.
In contrast, the reverse osmosis process uses hydraulic pressure as the driving force for separation, which serves to counteract the osmotic pressure gradient that would otherwise favor water flux from the permeate to the feed. Hence significantly more energy is required for reverse osmosis compared to forward osmosis.
The plant consists of 8,600 sea water reverse osmosis (RO) membranes, 248 pressure vessels, 115 pressure exchangers, 5 high-pressure pumps, 16 pressure filter vessels, electrical, automation and control systems and 1,200 m of HDPE pipelines of 1,600 mm diameter.
The silt density index is a measure for the fouling capacity of water in reverse osmosis systems. The test measures the rate at which a 0.45-micrometre filter is plugged when subjected to a constant water pressure of 206.8 kPa (30 psi).
Reverse osmosis has been used for the production of demineralised water for over 30 years. [10] In reverse osmosis, water is transported across a membrane under high pressure, leaving a product that consists mainly of water and a concentrate containing most other components such as minerals and unwanted residues . [ 12 ]
Pressure filters find widespread application in municipal water systems, industrial settings, residential well water systems, and swimming pools. These DE filtration systems are rather simple and can be used in a vertical or horizontal setting and can be modified to allow the application of multimedia filters.
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