Gobal Water intelligence.com
a Thesis on the subject pdf (4.8 mb)
Aqualyng enables constant supply of fresh drinking
water, using technology that tenders economical solutions even in rural areas.
Our desalination plants can be installed close to end users. Decentralised
solutions reduce distribution cost, minimise environmental damage, enable water
intake from saltwater wells and are easily adapted to suit local building
Low energy consumption
desalination process uses membrane filter based on the reverse osmosis
principle. Our proprietary energy recovery process recycles as much as 98.5% of
the energy. Moreover, this advanced system consumes some 2 kWh per cubic metre
of fresh water, which is considerably less than traditional solutions.
Aqualyng's energy recycling process gives low operating cost and improved
operation condition for the membranes.
Aqualyng's solution secure low investment cost and low operation cost.
energy consumption rates for a conventional system (with Pelton turbine as
energy recovery device) are around
3 - 4.5 kWh/m3 of fresh water produced
from Atlantic seawater. The energy consumption of desalting Atlantic seawater
at 20oC temperature using the Aqualyng system is 2.0 kWh/m3 of fresh water
produced.Compared to conventional systems with
turbines, the Aqualyng system results in a saving of minimum 1.5 kWh/m3.
However, the system becomes more advantageous as the feed water salinity
incre-ases and savings of 2-3 kWh/m3 is, for example, to be expected for most
cases of Red Sea and Arabian Gulf applications.
The AqualyngTM system
uses the brine energy in a special equipment, called the Recuperator, to
pressurise seawater to the same pressure as the brine. The process is actually a
pump, of the reciprocating principle, hydraulically driven by the brine.
capacity of this "pump", in terms of flow and pressure, is the same as the brine
There are no moving parts in the Recuperator, as opposed to
other pressure recovery devices, and this increases the durability of the
A small booster pump is required to compensate for the pressure
drop in the membranes and the piping system. This booster pump increases the
pressure of the pre-treated seawater that has gone through the "pressure
recuperator" up to the operating pressure required at the membranes inlet. As
the process delivers seawater at the same flow rate as the brine rejected by the
RO membranes, then the capacity of the high-pressure pump will be equal to the
fresh water produced by the membranes.
This means that with a system
recovery rate of 40%, 60% of the feed water is delivered by the Recuperator
system and only 40% from the high pressure pump.
In a conventional SWRO
desalination system, all feed water has to go through the high-pressure pump
which only has a modest efficiency, 70-85%, dependent on type and size. The
Recuperator has an efficiency of around 98% and this is where the big difference
The AQUALYNG - energy recovery system is a work exchanger that uses the
saline-reject (brine) from the membranes to pressurise pre-treated seawater in a
The whole system uses pairs of
duplex stainless steel vessels that work alternatively
in a compression and
decompression-discharge sequence. Pre-treated seawater comes from a pressurised
feeding tank that keeps a constant flow and pressure into
the system. One of
the vessels is under high-pressure by the brine and displacing seawater while
the other is filling up with low-pressure pre-treated seawater from
and draining the reject at the bottom.
The pressurised seawater goes
into the membrane train via a booster pump. This pump compensates the head
losses across the membrane elements and the piping system, which are around 2-3
The whole sequence is accomplished by the operation of a set of
several duplex stainless steel valves actuated by a hydraulic system and
automatically controlled by
a PLC platform, thus resulting in a continuous
flow of seawater at high pressure into
the Recuperator animation here
Aqualyng wins contract to Build, Own, Operate 114 000 m3/day desalination
plant in Karachi, Pakistan
Vanvikan, Norway, June, 26th, 2007 The agreement includes a dedicated power plant and distribution
piping, and will be completed in 24 months. The plant will be located in the
Hawks Bay area, where the land has been made available by the City District
Government Karachi (CDGK) .Included in the agreement is the option of increasing
capacity to 228 000 m3/day.
Aqualyng, leading supplier of
desalination plants based upon reverse osmosis technology, secures breakthrough
project in Karachi. A contract has been signed between Karachi Water &
Sewerage board and Aqualyng to build, operate and produce 114 000 m3 of potable
water to Karachi. The city of Karachi has the past years experiences severe
water shortage, and the establishing of this mega plant is the first step in the
process of utilizing desalination to reduce the water shortage.
The signing of this major project follows
Aqualyngs recent success in Pakistan with the signing of an MOU for 2x10.000
m3/day in Gwadar, Balochistan.
water - less energy
Aqualyng AS is a Norwegian
company specialized in delivering desalination plants for production of all
qualities of water. Aqualyng AS develops, fabricates, sells,
operates and services desalination plants, and has installed successful plants
since 1999. The Aqualyng plants are cost-effective solutions based on the
patented energy recovery system, the Recuperator, and standardized modules.
Aqualyng AS is owned by Aqualyng
Holding, a company dedicated to financing water contracts globally.
Aqualyng Holding is established in Norway and Dubai, and has the financial
strength to participate in large international desalination projects.
For more information, please contact:
Christian Wee, Sales