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Nanofilters Promise Pump Energy Savings During Reverse Osmosis

Posted September 05, 2016 12:00 AM by Engineering360 eNewsletter

This story out of the Nanyang Technological University in Singapore details the development of a new type of nanofilter for wastewater treatment. It allows for combining of the typically separate ultra-filtration and reverse osmosis (RO) processes. The secret ingredient to the new nanofilter, as noted in an article on Engineering360: a hollow fiber membrane that, among other attributes, requires only 2 bars of water pressure yet produces water nearly as pure as that resulting from RO. The pressure conventionally required is 10 bars or more. The membrane promises to dramatically reduce the amount of energy needed to power the pumps used in the process.
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Re: Nanofilters Promise Pump Energy Savings During Reverse Osmosis

09/07/2016 4:19 PM

This is really good news! It means reduction of footprint for some of the required water purification in power industry. It might even mean in some lower pressure boiler makeup settings, the requirement for a demineralizer downstream of RO could be eliminated by using this new filter (at the lower pressure) upstream. The RO existing would be fed the product from the nanofilter, thus reducing TDS and silica even further.

Depending on exact water requirements, the water could then be further purified by EDI on only the stream requiring ultimate purity.

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