It has been shown that the overall selectivity and efficiency for all types of the membranes increase with increasing pressure. A novel hybrid forward osmosis nanofiltration fonf. Reverse osmosis seawater membranes seawater desalination ro. Comparison of nanofiltration and reverse osmosis processes for a selective desalination. Recently, nanofiltration membranes have been employed in pretreatment unit operations in both thermal and membrane seawater desalination. Performance testing of seawater desalination by nanofiltration.
Modeling nanofiltration for large scale desalination. Modeling of flatsheet and spiralwound nanofiltration. Nanofiltration as pretreatment for scale prevention in. 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. Two stage nanofiltration seawater desalination system vuong. Pdf nanofiltration as a costsaving desalination process. Nanofiltration process for seawater desalinationsalt production. Article pdf available in desalination and water treatment 511. Pdf one of the main applications of nanofiltration nf is in the pretreatment stage of seawater desalination. Our research group has developed and patented in chile a scalable desalination process that considers two stages of nanofiltration. Pdf pretreatment with nanofiltration nf in seawater.
Membranebased seawater desalination processes have typically applied only ro. 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. Results from both fo and nf tests suggested that the hybrid fonf process is a feasible process for seawater desalination. Solarpowered desalination with nanofiltration membranes agrisol project. Aug 03, 2015 a mini pilot scale seawater desalination system was installed at urla bayizmir, turkey. Characterization of membrane foulants in seawater reverse osmosis desalination. Desalination and nanofiltration through functionalized. Comparison of nanofiltration and reverse osmosis processes. Nanofiltration, desalination, membrane separation, reverse osmosis. Water fluxes of about 10 lm2h, for both fo and nf processes could be achieved. Seawater nanofiltration for the elaboration of usable salty. Request pdf nanofiltration process for seawater desalinationsalt production integrated system a performance of three commercial nanofiltration membranes nf200, nf270 and tfcsr2 koch was. Twopass nanofiltration seawater desalination prototype testing. Currently, ro is the most widely used method for desalination in the united states.
The present invention is directed to a method and apparatus fig. Feedwater sources may include brackish, seawater, wells, surface rivers and streams, wastewater, and industrial feed and process waters. Nanoparticletemplated nanofiltration membranes for ultrahigh. Thin film nanocomposite reverse osmosis membrane modified by two dimensional laminar mos2 with improved desalination performance and foulingresistant characteristics. Nanofiltration as pretreatment for seawater desalination drntu. Nanofiltration process for seawater desalinationsalt production integrated system. 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. Solarpowered desalination with nanofiltration membranes. Ami seawater ro membranes can be used as replacements in many watermaker seawater desalination filter brands, with exceptional value and performance benefits.
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. Pdf we present the possibility to replace the firststage reverse osmosis ro seawater by nanofiltration nf membranes. One of the main applications of nanofiltration nf is in the pretreatment stage of seawater desalination. Nf and reverse osmosis ro membranes becomes the most suitable. The ability of a nanofiltration membrane to remove hardness and. Pdf a new approach to membrane and thermal seawater. We present the possibility to replace the firststage reverse osmosis ro seawater by nanofiltration nf membranes. 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. Benchscale testing of seawater desalination using nanofiltration catherine j.
One of the main applications has been in brackish and sea water treatment for drinking water production as well as for wastewater treatment. Nanofiltration as a pretreatment step in seawater desalination. 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. Nanofiltration process efficiency in water desalination. 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. 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. Design and modeling of novel lowpressure nanofiltration. 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. Seawater desalination by combined nanofiltration and ionic exchange. Reverse osmosis seawater membranes seawater desalination. According to the international desalination association, in june 2015, 18,426 desalination plants operated worldwide, producing 86. 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. This relatively thick membrane was made from cellulose acetate and required feed pressure in excess of 1,000 psi. 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.
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. Fo is a natural process in which water was driven through a semipermeable membrane by an osmotic pressure gradient. 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. Desalination is a process that takes away mineral components from saline water. Pdf nanofiltration as a pretreatment step in seawater. 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. Seawater desalination by reverse osmosis is widely practiced. Critical appraisal of current nanofiltration modelling strategies for seawater desalination and further insights on dielectric exclusion desalination, 343 2014, pp. The ability of a nanofiltration membrane to remove hardness. Comparison of nanofiltration and reverse osmosis processes for a selective desalination of brackish water feeds hanane dach to cite this version. 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 traditional desalination technology is improving due to introduction of nanotechnologies like nanofiltration. 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. Benchscale testing of nanofiltration for seawater desalination. Nanofiltration process for seawater desalinationsalt. 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. Pretreatment with nanofiltration nf in seawater desalination preliminary. Development of lower cost seawater desalination processes.
Currently, ro is the most widely used method for desalination. Recently, nanofiltration membranes have been employed in pretreatment unit operations in both thermal and membrane seawater desalination processes. The only alternative source is desalination of seawatersaline water. Comparison of nanofiltration and reverse osmosis processes for a selective desalination of brackish water feeds. Nov 06, 2003 a seawater desalination system comprising. Us7144511b2 two stage nanofiltration seawater desalination. Please check our watermaker replacement cross reference chart to find the suitable replacement seawater desalination. Desalination and water purification research and development program report no. Seawater desalination by combined nanofiltration and ionic. Therefore, nanofiltration membranes have received interest worldwide. Nowadays water demand already exceeds supply and water scarcity is a global problem.
Strategiesforusingfilmtecelementstoloweryourtotalcostof seawater. Nanofiltration nf, introduced in late 80s, is a membrane process whose performance falls between ultrafiltration uf and reverse osmosis ro. 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. 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.
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. A performance of three commercial nanofiltration membranes nf200, nf270 and tfcsr2 koch was investigated in order to check their ability in the. Then, we tested few membranes in the laboratory nf200, nf2540, mps44, and mps34. Pdf thinlayer nanofiltration membranes using engineered. Water desalination processes separate dissolved salts and other minerals from water. Sodium hydroxide production from seawater desalination. 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.
Seawater desalination using reverse osmosis applied. Seawater nanofiltration for the elaboration of usable. Concentrating brine from seawater desalination process by. Water desalination using cellulosic nanofiltration membrane. Nf has high rejection rates for divalent ions and could eliminate the scaling species that pose serious fouling problems in seawater desalination. Application of nanofiltration pretreatment to remove divalent ions for economical seawater reverse osmosis desalination.
A nfed integrated membrane technology for utilization of brine from seawater desalination process was proposed and investigated. Introduction seawater desalination is a separation process. Comparison of the three major desalination technologies reverse osmosis 3. Seawater reverse osmosis swro has always been one of the favourite desalination technologies worldwide due to its high efficiency and low operating cost. Saltwater is desalinated to produce water suitable for human consumption or irrigation. Seawater desalination by using nanofiltration nf and. Nanofiltration nf, a lower pressure membrane process with high. Pdf benchscale testing of nanofiltration for seawater. Nanofiltration nf membranes have applications in several areas. Characterization of membrane foulants in seawater reverse. Desalination welcomes submissions detailing work that is clearly connected to water desalting including applications of desalination. Seawater desalination to convert seawater into potable water is being used in many parts of the world.
Forward osmosis membranes modified with laminar mos2 nanosheet to improve desalination performance and antifouling properties. A novel hybrid forward osmosis nanofiltration fonf process for seawater desalination. The ability of a nanofiltration membrane to remove. Feedwater sources may include brackish, seawater, wells, surface rivers and streams, wastewater, and industrial. Fo has been proposed for seawater desalination since the 1970s. Membrane separation requires driving forces including pressure applied and vapor, electric potential, and concentration. Majority of the studies of fo membranes have been focused on either power generation or water production.
So it is necessary to develop novel technologies to be able to use poorer quality source waters for drinking. 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. Seawater desalination by membranes has increased in recent years in response to. Process modeling of brackish and seawater nanofiltration.
Desalination is an interdisciplinary journal publishing high quality papers on desalination materials, processes and related technologies. Pretreatment with nanofiltration nf in seawater desalination preliminary integrated membrane tests in urla, turkey. May 21, 2018 nanofiltration nf membranes with ultrahigh permeance and high rejection are highly beneficial for efficient desalination and wastewater treatment. Reverse osmosis process using thinfilm composite membranes has evolved over the last 20 years and has brought down the cost of desalination. Nf can either be used to treat all kinds of water including ground, surface, and wastewater or used as a pre treatment for desalination.