Two stage nanofiltration seawater desalination system vuong. Seawater desalination using reverse osmosis applied. Seawater desalination by using nanofiltration nf and. Nanofiltration process efficiency in water desalination.
Recently, nanofiltration membranes have been employed in pretreatment unit operations in both thermal and membrane seawater desalination. Recently, nanofiltration membranes have been employed in pretreatment unit operations in both thermal and membrane seawater desalination processes. Twopass nanofiltration seawater desalination prototype testing. Desalination is a process that takes away mineral components from saline water. Water desalination processes separate dissolved salts and other minerals from water. Water fluxes of about 10 lm2h, for both fo and nf processes could be achieved. The present invention is directed to a method and apparatus for desalinating seawater utilizing a two stage seawater desalination system, a first stage including at least one high performance nanofiltration membrane to receive seawater feed pressurized by a first stage pump sufficiently and to produce a first permeate, and a second stage including at least one high performance nanofiltration. Our research group has developed and patented in chile a scalable desalination process that considers two stages of nanofiltration in portable units, flexible in capacity, with renewable energy. The present invention is directed to a method and apparatus fig. Seawater desalination by reverse osmosis is widely practiced. Reverse osmosis seawater membranes seawater desalination. According to the international desalination association, in june 2015, 18,426 desalination plants operated worldwide, producing 86. Request pdf nanofiltration process for seawater desalinationsalt production integrated system a performance of three commercial nanofiltration membranes nf200, nf270 and tfcsr2 koch was.
Reverse osmosis seawater membranes seawater desalination ro. A nfed integrated membrane technology for utilization of brine from seawater desalination process was proposed and investigated. Application of nanofiltration pretreatment to remove divalent ions for economical seawater reverse osmosis desalination. We present the possibility to replace the firststage reverse osmosis ro seawater by nanofiltration nf membranes. Nov 06, 2003 a seawater desalination system comprising.
Results from both fo and nf tests suggested that the hybrid fonf process is a feasible process for seawater desalination. Nanofiltration nf, introduced in late 80s, is a membrane process whose performance falls between ultrafiltration uf and reverse osmosis ro. Feedwater sources may include brackish, seawater, wells, surface rivers and streams, wastewater, and industrial. Nf and reverse osmosis ro membranes becomes the most suitable. Aug 03, 2015 a mini pilot scale seawater desalination system was installed at urla bayizmir, turkey. Concentrating brine from seawater desalination process by.
Nanofiltration as pretreatment for seawater desalination drntu. A performance of three commercial nanofiltration membranes nf200, nf270 and tfcsr2 koch was investigated in order to check their ability in the. Sodium hydroxide production from seawater desalination. Performance testing of seawater desalination by nanofiltration. Then, we tested few membranes in the laboratory nf200, nf2540, mps44, and mps34. The traditional desalination technology is improving due to introduction of nanotechnologies like nanofiltration. Pretreatment with nanofiltration nf in seawater desalination preliminary. May 21, 2018 nanofiltration nf membranes with ultrahigh permeance and high rejection are highly beneficial for efficient desalination and wastewater treatment. One of the main applications has been in brackish and sea water treatment for drinking water production as well as for wastewater treatment. Pdf nanofiltration as a costsaving desalination process. Comparison of nanofiltration and reverse osmosis processes for a selective desalination of brackish water feeds hanane dach to cite this version. However, one of the inherent drawbacks of swro is its prone to membrane fouling because of the high total dissolved solids concentration in seawater. Seawater desalination to convert seawater into potable water is being used in many parts of the world.
One of the main applications of nanofiltration nf is in the pretreatment stage of seawater desalination. Seawater desalination by membranes has increased in recent years in response to. Desalination and water purification research and development program report no. Thin film nanocomposite reverse osmosis membrane modified by two dimensional laminar mos2 with improved desalination performance and foulingresistant characteristics.
Request pdf performance testing of seawater desalination by nanofiltration nanofiltration membranes of the ern, nf90, and sr90 brands have been studied in use for the treatment of model. Seawater nanofiltration for the elaboration of usable. Majority of the studies of fo membranes have been focused on either power generation or water production. Reverse osmosis ro and nanofiltration nf in relation to thermal processes, reverse osmosis ro is a relatively new process that was commercialized in the 1970s buros, 2000. The ability of a nanofiltration membrane to remove hardness and.
It has been shown that the overall selectivity and efficiency for all types of the membranes increase with increasing pressure. Introduction seawater desalination is a separation process. Seawater reverse osmosis swro has always been one of the favourite desalination technologies worldwide due to its high efficiency and low operating cost. Nanofiltration process for seawater desalinationsalt. Nanoparticletemplated nanofiltration membranes for ultrahigh. Pdf we present the possibility to replace the firststage reverse osmosis ro seawater by nanofiltration nf membranes. Nanofiltration membranes of the ern, nf90, and sr90 brands have been studied in use for the treatment of model solutions simulating seawater with the varying salt content. Nowadays water demand already exceeds supply and water scarcity is a global problem. Our research group has developed and patented in chile a scalable desalination process that considers two stages of nanofiltration. Characterization of membrane foulants in seawater reverse osmosis desalination. The implementation of seawater desalination, a key strategy to secure fresh water supply in arid and coastal regions, is greatly thwarted by its high cost relating to high energy and equipment cost associated with pressure and the high system or membrane fouling associated with the bivalence ions in the sea water. Seawater nanofiltration for the elaboration of usable salty. Currently, ro membranes used to desalinate seawater require about 800 to 1,200 psi, while brackish water applications may necessitate feed pressure ranging from 100 to 600 psi. The complete system consisted of sand filters, a 5 micron cartridge filter.
Membranebased seawater desalination processes have typically applied only ro. Forward osmosis membranes modified with laminar mos2 nanosheet to improve desalination performance and antifouling properties. Water desalination using cellulosic nanofiltration membrane. The primary journals reporting articles on nanofiltration are the journal of membrane science, desalination and separation and purification technology, although articles have been spread across a. Modeling nanofiltration for large scale desalination. Currently, ro is the most widely used method for desalination. Desalination welcomes submissions detailing work that is clearly connected to water desalting including applications of desalination to seawater, groundwater and waste waters, such as thermal. Desalination welcomes submissions detailing work that is clearly connected to water desalting including applications of desalination. The ability to increase ph is a crucial need for desalination pretreatment especially in reverse osmosis and for other industries, but processes used to raise ph often incur significant emissions and nonrenewable resource use. Solarpowered desalination with nanofiltration membranes agrisol project. Therefore, nanofiltration membranes have received interest worldwide. Pdf pretreatment with nanofiltration nf in seawater. Comparison of the three major desalination technologies reverse osmosis 3. Nov 30, 2012 nanofiltration membranes of the ern, nf90, and sr90 brands have been studied in use for the treatment of model solutions simulating seawater with the varying salt content.
Although nf and ededr are also mature technologies and can be used for desalination, ededr are typically not cost competitive for desalination of seawater amjad 1993, and nf is not ordinarily considered for seawater desalination. Characterization of membrane foulants in seawater reverse. Us7144511b2 two stage nanofiltration seawater desalination. Comparison of nanofiltration and reverse osmosis processes for a selective desalination.
For scale prevention in seawater reverse osmosis swro plants certain antiscalants, such as polyphosphates or polycarboxylic acids, are added to the feed water, but even with this precaution, the product water recovery. Seawater desalination by combined nanofiltration and ionic exchange. Pdf benchscale testing of nanofiltration for seawater. Article pdf available in desalination and water treatment 511. Abstract our article deals with the possibilities to treat seawater using commercial nanofiltration polyamide membranes, denoted nf70 and nf 200, in order to elaborate usable salty aqueous. Abstract the implementation of seawater desalination, a key strategy to secure fresh water supply in arid and coastal regions, is greatly thwarted by its high cost relating to high energy and equipment cost associated with pressure and the high system or membrane fouling associated with the bivalence ions in the sea water. More generally, desalination refers to the removal of salts and minerals from a target substance, as in soil desalination, which is an issue for agriculture. Nanofiltration as pretreatment for scale prevention in. Nf has high rejection rates for divalent ions and could eliminate the scaling species that pose serious fouling problems in seawater desalination.
Comparison of nanofiltration and reverse osmosis processes. Development of lower cost seawater desalination processes. Nanofiltration process for seawater desalinationsalt production integrated system. The ability of a nanofiltration membrane to remove. Critical appraisal of current nanofiltration modelling strategies for seawater desalination and further insights on dielectric exclusion desalination, 343 2014, pp. Pdf one of the main applications of nanofiltration nf is in the pretreatment stage of seawater desalination.
Solarpowered desalination with nanofiltration membranes. Nanofiltration process for seawater desalinationsalt production. Pdf a new approach to membrane and thermal seawater. Nanofiltration, desalination, membrane separation, reverse osmosis. This relatively thick membrane was made from cellulose acetate and required feed pressure in excess of 1,000 psi. Ami seawater ro membranes can be used as replacements in many watermaker seawater desalination filter brands, with exceptional value and performance benefits.
Benchscale testing of nanofiltration for seawater desalination article pdf available in journal of environmental engineering 311 november 2007 with 676 reads how we measure reads. Comparison of nanofiltration and reverse osmosis processes for a selective desalination of brackish water feeds. A performance of three commercial nanofiltration membranes nf200, nf270 and tfcsr2 koch was investigated in order to check their ability in the integrated ufnfromedcrystallization seawater desalination. Benchscale testing of seawater desalination using nanofiltration catherine j. Reverse osmosis process using thinfilm composite membranes has evolved over the last 20 years and has brought down the cost of desalination. The ability of a nanofiltration membrane to remove hardness. Design and modeling of novel lowpressure nanofiltration. The only alternative source is desalination of seawatersaline water. Fo is a natural process in which water was driven through a semipermeable membrane by an osmotic pressure gradient. Membrane separation requires driving forces including pressure applied and vapor, electric potential, and concentration.
Pdf thinlayer nanofiltration membranes using engineered. Desalination and nanofiltration through functionalized. Process modeling of brackish and seawater nanofiltration. So it is necessary to develop novel technologies to be able to use poorer quality source waters for drinking. Pdf nanofiltration as a pretreatment step in seawater. Seawater desalination by combined nanofiltration and ionic. Please check our watermaker replacement cross reference chart to find the suitable replacement seawater desalination. Abstract our article deals with the possibilities to treat seawater using commercial nanofiltration polyamide membranes, denoted nf70 and nf 200, in order to elaborate usable salty aqueous solutions from high concentrated solutions with total salinity around 70 gl to isotonic solutions with total salinity in the range of 9 gl.
Fo has been proposed for seawater desalination since the 1970s. In addition, the model was utilized to predict the performance of a seawater nanofiltration system which has been validated with the data obtained from a largescale seawater desalination plant, thereby establishing a reliable model for desalination using nanofiltration. Benchscale testing of nanofiltration for seawater desalination. Desalination is an interdisciplinary journal publishing high quality papers on desalination materials, processes and related technologies. Modeling of flatsheet and spiralwound nanofiltration. Although nf and ededr are also mature technologies and can be used for desalination, ededr are typically not cost competitive for desalination of seawater amjad 1993, and nf is not ordinarily considered for seawater desalination for potable water production. Currently, ro is the most widely used method for desalination in the united states. Nanofiltration as a pretreatment step in seawater desalination. A novel hybrid forward osmosis nanofiltration fonf process for seawater desalination. Nanofiltration nf is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening polyvalent cation removal and removal of disinfection byproduct precursors such as natural organic matter and synthetic organic matter nanofiltration. Please check our watermaker replacement cross reference chart to find the suitable replacement seawater desalination membrane element for your watermaker filter system.
A novel hybrid forward osmosis nanofiltration fonf. Nanofiltration nf, a lower pressure membrane process with high. Feedwater sources may include brackish, seawater, wells, surface rivers and streams, wastewater, and industrial feed and process waters. Pretreatment with nanofiltration nf in seawater desalination preliminary integrated membrane tests in urla, turkey. Saltwater is desalinated to produce water suitable for human consumption or irrigation.