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Ultra Pure Water Reverse Osmosis EDI Membrane Stack Water Filtration System E-Cell-3X
For many years, operators of pure water production systems were
trying to find a technology to replace mixed bed ion exchange for
final demineralization. The operating cost as well as the
complexity and risks associated with acid and caustic regeneration
were frustrations to these operators. EDI became established as the
innovative alternative solution by reducing operating costs,
improving site environmental, health, and safety risk profiles, and
producing a continuous and steady supply of pure and ultrapure
water.
Production of pure water has evolved from conventional pretreatment
with multiple stages of ion exchange in initial and final
demineralization to the following membrane based
operations,including EDI, that are now considered to be best
practice by many customers around the world.
EDI utilizes both traditional ion exchange resin and ion exchange membrane to remove contaminants, including those that are uncharged or lightly charged in the feed water such as silica and boron. The biggest advantage lies in the fact that EDI technology employs direct current to drive contaminants out of the feed water and through the ion exchange membranes into the concentrate channels. The direct current also splits water into hydrogen and hydroxyl ions which act as continuous regenerating agents so that contaminants do not accumulate on the ion exchange resin. Therefore, EDI can continuously and predictably produce high-purity and ultrapure water with equal or better quality than mixed bed ion exchange.
General Description
As part of the E-Cell* electrodeionization product line,the
E-Cell-3X Stack is designed to:
• Use electrical current to provide ultrapure waterfor
semiconductor fabrication, power generation,solar panel production,
green hydrogen generation and many other heavy industries.
• Deliver premium performance including both the highest levels of
product water quality and the lowest energy consumption.
• Minimize cleaning requirements at higher feed water hardness
levels using counter-current operation.
• Be leak free, guaranteed with standard 3-year prorated warranty.
• Operate continuously and require no caustic or acid for
regeneration of ion exchange resin within the stack.
• Require no brine injection or concentrate recirculation.
Typical Applications
The product water from the E-Cell-3X can be relied upon to meet
today’s most demanding ultrapure water applications including:
• Ultrapure water for rinsing of semiconductor chips, solar panels,
and other microelectronics
• Demineralized boiler feed water for high pressure boilers found
in power plants and other heavy industrial sites
• Ultrapure water for electrolyzer green hydrogen generation. For
ease of design and additional confidence in your EDI application,
E-Cell performance projections and guarantees are available in the
Winflows* software or by contacting Veolia.
E-Cell-3X Stack Specifications | |
Nominal Flow | 5.0 m3 /h (22 gpm) |
Flow Rate Range | 2.3–6.4 m3 /h (10–28 gpm) |
Shipping Weight | 165 kg (364 lbs) |
Dimensions (width x height x depth) | 30 cm x 61 cm x 72cm 12’’ x 24” x 29'' |
Notes:
1. Actual performance may vary depending on site conditions.
Reference Winflows projection software to verify expected product
water quality as well as the resistivity, sodium, and silica
performance guarantees that are offered for the design conditions.
To obtain boron or other guarantees, contact Veolia.
2. Inlet pressure is determined by the downstream pressure
requirements for the product and concentrate streams,the choice of
counter-current or co-current operation, and stack pressure drop.
3. At nominal flow and 25°C. Reference Winflows projection software
to verify for design conditions.
4. Reference the Winflows projection software and the E-Cell Stack
Owner’s Manual to verify feed water specifications for the design
conditions.
5. TEA (ppm as CaCO3) - Total Exchangeable Anion, this represents
the concentration of all of the anions present in the feed water
including contributions from OH-, CO2 and SiO2. Winflows must be
used to confirm the feed water TEA is acceptable at the specific
applications’ operating conditions. Table value is at minimum flow
and maximum temperature.
6. 1.0 ppm as CaCO3 feed water hardness limit applies to standard
counter-current flow operation only. Allowable feed water hardness
decreases to 0.1 ppm as CaCO3 in co-current flow operation.
7. Allowable silica limit decreases above nominal flow. Allowable
silica limit decreases to 0.5 ppm with feedwater hardness above 0.5
ppm as CaCO3.
8. The boron feed level is limited to 0.3 ppm as B whenever there
is a silica guarantee requirement or resistivity guarantee
requirement above 10 MOhm-cm, as higher boron levels could impact
performance. Without these requirements the limit is 1.0 ppm boron.
9. Reverse Osmosis (RO) or equivalent feed water: RO provides EDI
feed water that is substantially free of particulate matter,
colloidal material and high molecular weight organic substances,
which can foul ion exchange media. RO permeate quality is specified
since EDI stacks contain packed beds of ion exchange medium that
cannot be backwashed/fluidized to remove particulate matter.Systems
with an open system between a RO system (or other source) and
E-Cell (ex. tank, decarbonator) must be fitted with filters
immediately preceding the E-Cell, to protect the E-Cell against
contamination with particulate matter. Generally, a 5 µm absolute
or 1 µm nominal filterwill be acceptable.
10. APHA - color standard/scale named for the American Public
Health Association and defined by ASTM D1209.Veolia Water
Technologies