| Hydrocons offers Reverse Osmosis system
with spirally wounded composite membrane
with FRP or stainless steel RO housing for
the membrane. The system is provided with
proper pre treatment to ensure the safety
of the RO membrane & to obtain maximum
overall recovery from the system. Necessary
safety interlocks are provided to safeguard
the high pressure pump & the RO membranes.
Hydrocons offer manual & completely
automatic reverse osmosis system to meet
the customer requirement.
Hydrocons offer world’s latest electrodeionisation
technology to generate high purity water.
EDI cell can meet stringent water quality
such as USP standards. The RO permeate water
having conductivity less than 20 us/cm fed
to EDI cell. The ion-exchange takes place
on ultra pure resin bed. These absorbed
ions of resins pulls towards concentrate
chambers by respective electrode, these
pulled ions continuously flush in concentrate
chamber with small amount of RO permeate
water & finally goes to drain.
RO System with can be designed for any
feed water quality. RO System with max.
overall recovery of 75-80% can be designed.
The semi-permeable reverse osmosis membrane
has a porosity 0.001 micron. Pressure sensors
are provided across the RO system so as
to measure feed & reject pressure of
RO system. As soon as discharge pressure
& pressure drop is more than 15 to 20%
than normal then system will give alarm
& if not attained within 5 min., the
system will be tripped automatically. The
Reverse Osmosis System consist of Hot water
Sanitizable, high rejection & low energy
type RO membranes. The RO membrane is housed
in the High Pressure FRP/ SS 316/ SS 316
L. For high purity water the pipe end connections
are with TC end connection.
Continuous Electro-Deionisation systems
(CEDI) for producing pure water.
Introduction :
With the advent of new technology it is
now practical to deionise water without
the use of cation and anion resins regenerated
with acid and caustic solutions; this technology
is known as Continuous Electro-Deionisation
or CEDI.
The process was developed in 1980 and has
since been perfected in the form of modular
cells for use in high purity water systems
as a polishing de-ioniser when feed with
permeate from a Reverse Osmosis system,
thus replacing the requirement for twin
bed and mixed bed de-ionisers.
Description of Continuous CEDI Cell:
CEDI systems are used as a post-treatment
to reverse osmosis to further purify the
permeate to produce water with a quality
of 10 to 18 megohm depending on feed water
quality and flow rates. The
CEDI units are modular in construction
and can accommodate multiple CEDI modules.
Advantages of CEDI Cell over conventional
EDI Systems
- Does not require chemicals for regeneration
- Compact in size
- Produces consistent water quality
- Economical running costs
- Modular in construction
- Safe process
Process Description :
CEDI system has an recovery of 95%. The
5% reject water from EDI can be feed back
to the feed of RO System & hence the
overall recovery of the system is 100% (approx.).
CEDI consists of two chambers: the first
is ion exchange chamber / frame consist
of ultrapure cation & anion exchange
resins, these resins are in mixed form.
The second chamber is concentrate chamber.
These chambers are arranged in alternate
positions in EDI cell. The cation membrane
& anion membrane forms the boundary
of each ion exchange chamber. The cations
present in the feed water are exchanged
on cation exchange resins. These picked
up cations push through resin towards the
cathode & pass through the cation allowable
membrane into the concentrate chamber. Also
anions present in the feed water are exchanged
on anion exchange resins. These picked up
anions push through from resin towards the
anode & pass through the anion allowable
membrane into the concentrate chamber. All
rejected ions in the concentrate chamber
are continuously rinsed with a small amount
of the RO Permeate water. This water having
TDS not more than 25 – 30 ppm, can
be recycle to the feed of Reverse Osmosis
system. A part of permeate water when passes
through the electric field of EDI cell,
forms Hydrogen & Hydroxyl ions. These
ions regenerate the cation & anion resins
on-line.
A primary benefit of this system is continuous
operation, as the ion exchange resin is
regenerated continuously by electricity
instead of regeneration chemicals. This
approach eliminates the downtime, while
reducing chemical usage and the need for
waste treatment. No acid or caustic regenerate
chemicals are required.
Hot water sanitizable EDI systems are also
available for critical Pharma applications.
Similarly EDI units with higher flow capacities
and range are available for power plant
applications.
The unit incorporates the following
features:
- Polished stainless steel housing and
frame.
- Integral control panel with auto dump
feature.
- Panel mounted resistivity meter with
digital indication, temperature compensation
and 0-10V output option.
- Panel mounted pressure and flow metering
for the system.
- D.C. Voltage controller that can accept
a 4-20mA control signal to control voltage
in line with water quality.
- The complete unit is fully assembled
and ready for use simply by plumbing it
directly on to the permeate water supply
from a Reverse Osmosis system.
- The complete system complies 21 CFR
part 11 and backed with complete validation
documents.
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