SnowPure ExcellPureRO - High Silica Rejection Membrane Elements

High Silica Rejection Membrane Elements
Many potable waters from surface sources contain naturally low levels of silica (4-8 ppm), but volcanic areas like Japan and Mexico and groundwater sources in the Middle East normally contain 20-100 ppm. This causes problems when purifying water. Hence, membranes with high rejection of soluble silica (SiO₂) are valuable for producing ultrapure water.

Standard and low energy (LE) reverse osmosis (RO) membranes do not reject silica well, often only 97-98%. Special membranes (ExcellPureRO™) have been developed to reject silica over 99.2%.

SnowPure’s ExcellPureRO membranes are uniquely designed for high rejection of silica. Achieving low silica values from the RO is important for many applications, including providing feedwater for electrodeionization (EDI) systems. We have matched these SXR membrane elements to specific Electropure EDI modules. An article is published here on successfully operating RO-EDI in a high-silica environment.

Key properties to be successful rejecting silica:

1. flat sheet membrane must be designed for silica removal (SnowPure’s is)
2. operation must be at the correct flux/pressure (SnowPure has an element for each EDI model)

Avoiding silica scale:

SnowPure recommends using Avista Vitec 4000 with ExcellPureRO membranes to prevent silica scaling. With Vitec 4000, you can achieve up to 325 ppm SiO₂ in the RO concentrate.

SnowPure`s Separation Technologies

• Electropure EDI
• Zapwater Laboratory EDI
• Electropure ED-Electrodialysis
• ExcellMembranes (IX, RO, NF, UF)
• SPUV High Efficiency UV
• GTM-Gas Transfer Membranes
• DC Power Supplies for EDI

Doing Business with SnowPure

• Electropure™ EDI technology was born in 1977, before lonpure
• SnowPure is privately held
• SnowPure is your partner, not a competitor
• High quality technology training and OEM support
• Focus on Customer Service, rapid response.

Benefits of ExcellMembranes

• USA Membrane Technology
• Manufactured in USA
• Highly controlled process
• 34 years of broad membrane experience
• Reliable, robust, proprietary membranes
• ISO-9001 compliant quality system

Technology Training and OEM System Design Support

• SnowPure believes strongly in training—this helps ensure field success with our technologies.
• SnowPure assists new OEM customers through their system design phase, both during the OEM training and the design process. Support includes reviews of P&l diagrams and feedwater requirements.
• Combined with ongoing Technical Service, we help ensure success.