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Dow Water Solutions has revealed that Ningbo Jiufen Co-gen is using its ultrafiltration (UF) membranes as the sole pretreatment in its reverse osmosis water treatment process.

The UF membranes helped Ningbo Jiufen Co-gen manage the site’s steady supply of steam and hot water, resulting in optimal flux and high recovery.

The site handles the generation, installation, and repair of electrical services for the Ningbo province in China.

It also maintains a steady supply of source water through the nearby Xiepu River, which is high in total suspended solids with temperature fluctuation and seawater intrusion that increases the impurity level in the river.

The DOW UF membranes have overcome these challenges and demonstrated solid performance with an average product water turbidity of 0.1 Nephelometric Turbidity Unit (NTU) and silt density index (SDI) of less than two.

The UF membranes have been in operation since August 2005 without chemically enhanced backwash and with only periodic clean-in-place to restore or stabilise the transmembrane pressure.

Overall, the reverse osmosis system has only required four chemical cleanings over a two-year period.

The Dow UF solution consists of SFP-2660 modules.

Dow Water Solutions

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