Excellent Filtration Solutions For Seawater Desalination Plant
Since more than 70 percent of the world’s population lives within 120 kilometers of the ocean, the technology of sea water desalination has been rapidly applied in many countries and regions in the past 20 years. The latest data show that by 2020, people around the world has been built and contracted to build seawater and brackish water desalination plants, and its production capacity could reached 36 million tons of fresh water per day.
At present, desalination has spread to 125 countries and regions around the world, and desalinated water feeds about 5% of the world’s population. Seawater desalination, in fact, it has become a strategic choice widely adopted by many countries in the world to solve the problem of water shortage, and its effectiveness and reliability have been more and more widely recognized.
Filtration Process for Seawater Desalination Plant
The most commonly used seawater desalination technology is reverse osmosis membrane filtration, which mainly uses reverse osmosis membranes to remove the salt in the seawater, so that the seawater has a desalination effect. The whole seawater desalination project includes four parts of filtration: coarse filtration, micro filtration, ultra filtration and RO system.
Coarse filtration: coarse filtration generally uses multi-media filter housings and activated carbon filter housings. Multi-media filter housings are mainly used to remove suspended solids, colloids and other impurities and algae and other organisms in seawater. The activated carbon filter housing mainly absorbs the peculiar smell, organic matter, colloid in the seawater.
Micro filtration: The main purpose of micro filtration system is to filter the suspended solids, colloids, microorganisms and other impurities larger than 5 microns in seawater. Due to the high salt content of seawater, the security filter housing in the micro filtration system generally uses a fiber reinforced plastics filter housing with strong corrosion resistance.
Ultra filtration: The ultra filtration system generally selects the Ultrafiltration Membrane Module made of PVDF hollow fiber membrane and UPVC material membrane housing, which can intercept impurities with a particle size greater than 0.1 micron.
RO system: Seawater contains dissolved salt molecules, is forced through a RO system (essentially a filtration system), in which the larger salt molecules do not get through the membrane holes but the smaller water molecules do
Flow Chart of Filtration for Seawater Desalination Plant
Recommended Cartridge Filter for Seawater Desalination Plant
||Recommended Cartridge Filter
|Protection Filtration Before RO
||Polypropylene Melt Blown
Polypropylene String Wound
High Flow Cartridge Filter
|CPI for RO/UF
||Polypropylene Pleated Cartridge Filter
High Flow Cartridge Filter
Melt Blown Cartridge Filter: all 100% polypropylene material structure, lower cost and graded micron.
Polypropylene String Wound: long fiber material structure, no fiber leaching out, and high dirt holding.
High Flow Cartridge Filter: large diameter make sure large flow rate, could reach 500
GPM per hours, saving much installation place, and little change out times, little labor cost.
Customized Pretreatment Filtration Solutions to Optimize RO Membrane
Engineer in Brother Filtration will customized pretreatment solutions to optimize your RO membrane performance and extend its service life. Pretreatment is a key step in the design of desalination plants because we have to limit the speed of fouling and RO membrane clogging. Reducing clogging rates means removing algae, plankton, microorganisms and organic components. Brother Filtration provides customers with a full range of pretreatment processes, which are suitable for water containing a large number of organic ingredients. Advanced filtration membrane technology (ultra filtration, micro filtration) have been tested by customers all over the word.
Is the Water After Seawater Desalination Plant Drinkable?
As long as through the modern processing filtration treatment, the water could reach the safety and health standards, it can be drunk. Sea water desalination is generally to remove harmful and unsafe substances of sea water.
It is feasible to use seawater desalination technology for independent water supply, and the water quality can meet the requirements of drinking water standards. But in the actual sea water desalination, it is necessary to fully consider the user’s demand, the geographical environment of the project, water quality and other factors to select the best filtration equipment. In Brother Filtration, by optimizing the combination of filter cartridge and filter housing, the safety of water supply is guaranteed, and the equipment investment and operating costs are reduced.
What is the Average Unit Cost of Desalinated Groundwater and Seawater?
Unit cost of desalinated water is a function of capital cost, debt service, and operating cost. In general, cost of desalinated brackish water can range from $1.25 to $2.60 per 1,000 gallons, whereas desalinated seawater may cost anywhere from $3.60 to $5.80 per 1,000 gallons.