Membranes, Hydranautics, Toray and Koch
|Membranes - Reverse
Osmosis, Filmtec, Hydranautics and Koch
Crossflow membrane filtration is a
pressure-driven separation process. Application:
Industrial, food, water, chemical, and
biotechnology markets, as well as for those
providing environmental protection.
Membranes serve as highly-engineered, physical
barriers that permit the passage of materials
only up to a certain size, shape or character.
CWG offers reverse osmosis membranes, filmtec
membranes, koch membranes, and Hydranautics
membranes in a variety of configurations,
materials and sizes; each designed to meet
specific application needs
There are four main membrane separation
processes currently employed for liquid/liquid
and liquid/solid separation: microfiltration
(MF), ultrafiltration (UF), nanofiltration (NF)
and reverse osmosis (RO).
Spiral wound products have become the most
commonly used membranes for industrial water
applications such as boiler make-up water,
brackish water treatment, seawater desalination,
microelectronics and pharmaceutical water
applications. These membranes are available as
UF, NF and RO.
What is Semi-permeable Membrane?
Semi-permeable membrane refers to a membrane
that selectively allows certain species to pass
through it while retaining others. In actuality,
many species will pass through the membrane, but
at significantly different rates. In RO, the
solvent (water) passes through the membrane at a
much faster rate than the dissolved solids
(salts). The net effect is that a solute-solvent
separation occurs, with pure water being the
product. (In some cases, dewatering is desired
to concentrate the salts).
What is Osmosis?
Osmosis is a natural process involving the fluid
flow of across a semi-permeable membrane
barrier. Consider a tank of pure water with a
semi-permeable membrane dividing it into two
sides. Pure water in contact with both sides of
an ideal semi-permeable membrane at equal
pressure and temperature has no net flow across
the membrane because the chemical potential is
equal on both sides. If a soluble salt is added
on one side, the chemical potential of this salt
solution is reduced. Osmotic flow from the pure
water side across the membrane to the salt
solution side will occur until the equilibrium
of chemical potential is restored. In scientific
terms, the two sides of the tank have a
difference in their “chemical potentials,” and
the solution equalizes, by osmosis, its chemical
potential throughout the system. Equilibrium
occurs when the hydrostatic pressure
differential resulting from the volume changes
on both sides is equal to the osmotic pressure.
The osmotic pressure is a solution property
proportional to the salt concentration and
independent of the membrane.
CWG is a wholesalers’ of the reverse osmosis
membranes, Hydranautics membranes, filmtec
membranes (dow membranes), koch membranes, toray
||Low Energy/High Flow Tap & Brackish Water Thin Film Membranes
||High Rejection Tap & Brackish Water Thin Film Membranes
||Low Fouling Membranes
|Tapwater Commercial RO
||2.5"x40” and 4"x40” membranes, TW30, XLE, LP, BW30, TW30HP
|Tapwater Industrial RO
||4”x40” and 8”x40” membranes, l BW30, BW30LE, LE, XLE, FR, RO, HSRO
|Seawater RO Elements
||2.5"x40”, 4”x40” and 8"x40” Seawater membranes, SW30, SW30HR, SW30HRLE
||4”x40” and 8"x40” Nanofiltration membranes, NF90, NF270, NF200, NF
||8" Dia. Semiconductor SG, SG30
||Ultra Low Pressure Elements for Tap & Brackish Water Thin Film Membranes, 4040ULP, 4820ULP, 8821ULP, 8831ULP-575 magnum..etc.
||High Rejection Tap & Brackish Water Thin Film Membranes, 8822HR-400, 8822HR-365, 4820HR, 4040HR, ROGA8221HR …etc.
||Seawater Membranes, 2540SWHF, 4021SW, 1820SW, 1820HF, 2822SS, ..etc.
||Low Pressure Brackish Water
||Low Pressure Brackish Water
|TM810, TM820-370, M820-400