Qua Water Technologies Private Limited, having its head quarter in USA, manufactures filtration membrane
& membrane related products of highest technological excellence that cater to the water & wastewater
treatment & recycle systems. Click here to download PDF catalogue.
Advanced ultra-filtration membranes (UF Membranes),
FEDI (Fractional Electrodeionization) and membrane bio
||Fully in-house R&D
and manufacturing in
|Improve plant’s design economy & reliability, reduce
fouling, simplify cleaning, lower the total installed cost,
reduce footprint of overall waste water treatment.
FEDI and FEDI Rx | Two Stage Separation
The Electrodeionization (EDI) process, invented over 20 years ago, is a continuous, chemical-free method
that removes ionized and ionizable impurities from the feed water using DC power. EDI is most commonly
used to treat Reverse Osmosis (RO); permeate and replace Mixed Bed (MB) ion exchange; producing high
purity water of up to 18 M Ω.cm. EDI eliminates the need to store and handle hazardous chemicals
required for resin regeneration and the associated neutralization steps.
QUA’s Fractional Electrodeionization (FEDI) process is an advancement of EDI and was developed by
taking into account the limitations of conventional EDI. FEDI has been in the market for over five years
now and has been installed in power stations, refineries, and more. Many of these FEDI systems supplied
are some of the largest installed systems in the world.
The patented dual voltage process allows for a higher flexibility and tolerance to inlet water conditions,
thus lowering the risk of scaling, and improving the plant’s design economics and reliability. FEDI products
are supported with CE conformity certificates.
FEDI Technology | Making a good technology even
There are two types of ionic impurities removed in an EDI
process; strongly ionized impurities (divalent ions such as Ca,
Mg, SO4 and monovalent ions such as Na, Cl and HCO3) and
weakly ionized impurities (such as CO2, B and SiO2). Both
types of ionic impurities require a different driving force
(current) for movement and separation. Strongly ionized
impurities require less current, whereas weakly ionized
impurities require more. Rather than applying one current to
the entire module, the FEDI process differentiates the
treatment of weakly ionized and strongly ionized impurities by
applying different currents and voltages in a two stage process.
This allows a significant portion of strongly ionized impurities,
mainly the divalent ions, which can cause precipitation at a
higher voltage, to be removed in Stage-1. Subsequently, a
higher voltage is applied for removing weakly ionized impurities
in Stage-2. The rejected ions from both stages are removed,
using separate reject streams, thus preventing hardness
About FEDI Rx
FEDI® Rx stacks are a pharmaceutical grade water system featuring hot water sanitization ability at 85°C.
These stacks have the ability to produce high purity water quality up to 18 MΩcm using a patented process
with double sets of electrodes per stack. FEDI Rx stacks are available in four sizes (5X, 10X, 20X & 30X).
These stacks have widespread application in Pharmaceutical, Biomedical & Laboratories where hot water
sanitization is required.
Q-SEP | Hollow Fiber Ultrafiltration Membranes
Ultrafiltration (UF) is a membrane process used to remove suspended solids, colloidal matter, high
molecular-weight substances, bacteria and viruses from various feed water sources. UF membranes can
achieve a low and consistent silt density index (SDI) and are often used as pre-treatment for reverse
osmosis using surface water, seawater and biologically treated wastewater as feed source.
Q-SEP UF membranes incorporate high strength hollow fibers which deliver superior performance without
the risk of fiber breaks. These UF membranes are made from a hydrophilic polyether sulfone (PES)
material with excellent low fouling characteristics and operate under a pressurized inside-out flow
configuration for superior performance. Q-SEP modules are manufactured with NSF-PDWEP certification
for drinking water application.
Q-SEP UF fibers and modules are manufactured in a state-of-the-art, environmentally controlled
manufacturing facility. In the facility, continuous online monitoring to maintain consistent quality. Turbidity
can be reduced to less than 0.05 NTU. Typically, a 6-log removal for bacteria, giardia and cryptosporidium,
while a 4-log removal for viruses, can be achieved.
Q-SEP modules contain an advanced UF fiber prepared by an innovative patented cloud point precipitation
method. This method ensures a very uniform pore size distribution and high pore density in the
membrane. As a result, the product water quality from the Q-SEP modules is significantly better than the
quality from conventional UF modules at a very low operating pressure.
The fibers in the Q-SEP module are held firmly in place, which reduces the stress on the fibers even at
high flow velocities. Uniform fiber packing limits the pressure drop variation within the module and
prevents localized high fouling conditions. The unique end cap sealing design allows for high pressure
operation and ease of assembly. The UF modules can be used as dead-end filtration or in cross flow mode.
The membranes are available with 0.8 mm ID fibers, suitable for feed water with low turbidity and 1.2 mm
ID fibers, suitable to treat water with higher turbidity.
EnviQ | Membrane Bio Reactor (MBR)
QUA’s EnviQ flat sheet submerged ultrafiltration membranes have been specially developed to improve
the ease of operation and maintenance of MBR facilities. EnviQ’s innovative design offers ultrafiltration
quality product water with a stronger and more rugged PVDF flat sheet membrane. The unique features in
EnviQ consist of reverse diffusion and specially designed air diffusers, which maximize scrubbing
efficiency, lowers pressure and reduces cleaning.
EnviQ Technology | Superior Membrane Technology
EnviQ membranes have billions of
microscopic pores on the surface that form
a barrier to impurities, allowing clean
water to pass. Water is drawn through the
pores by using gentle suction. EnviQ
provides more consistent and higher
quality effluent using an advanced PVDF
reinforced membrane and proprietary
The proprietary air diffuser design maintains a continuous flow of consistent/correct sized air bubbles. This
then prevents solids from settling at the tank bottom or sticking to the membrane surface and eliminating
In addition, EnviQ lowers the total installed cost of biological waste water treatment and recycle systems
as compared to conventional activated sludge processes with tertiary filtration. EnviQ facilitates increased
MBR adoption, resulting in more efficient bio treatment, smaller foot print and high quality effluent.
MBR combines conventional activated sludge technology with membrane filtration. MBR can be designed at
a much higher MLSS concentration compared to conventional processes, giving advantages of lower
hydraulic retention time (HRT) and higher sludge retention time (SRT). This reduces the footprint of the
overall wastewater treatment. In addition, MBR replaces clarifier/ sedimentation tank as well as media and
membrane filtration. The treated water is highly superior and can be used directly, or as feed to a reverse
osmosis unit. EnviQ is available in modular construction. This ensures the ease of design as well as
CeraQ | Ceramic Filter
Due to the rigid material of construction, CeraQ ceramic ultrafiltration membranes offer high quality
filtration in virtually any environment. The ceramic membrane has various applications, mostly in treating
very difficult to treat water and wastewater, or where high temperature operation is involved. The ceramic
membrane is a very viable technology for produced water treatment.
CeraQ modules consist of 3.5 mm ID ceramic tubular elements potted into bundles for various surface
area requirements. They are produced from inorganic material such as aluminium oxide, silicon carbide,
titanium oxide, or zirconium oxide. Other features of CeraQ modules include their durability and material
stability cleaning the membrane with aggressive solvents if required.
CeraQ filter modules are available in four different pore sizes: 0.4, 0.05, 0.01 and 0.004 micron. The
various pore sizes address diverse applications. The alumina based ceramic membranes have proprietary
coating which ensures long service life and a high degree of permeance recovery. CeraQ is ideal for
applications where conditions are not well suited for polymeric membranes such as wastewater with high
fouling and/or high process temperatures.
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