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Sea water Desalination Systems
Sea water R/O system
reverse osmosis Sea water system
As Sea water Desalination Systems is the same theory as R/O system for city water and underground water, this system use high pressure plunger pump & high Rejection Membrane because of high salt grade of sea-water. Generally,
City water & underground water has 150ppm ~ 250ppm of TDS, but Sea-water has 34,000ppm ~ 36,000ppm of TDS. Due to this reason, sea-water is purified by high Rejection Membrane, which can remove salt about 99.4%. If sea-water is passed through this membrane, it becomes drinking water by the separation of water & salt. At the same time, as virus & bacteria are removed together, the water is the same condition as purified water of city-water.
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Application:
Dring water & ship water, the treatment of underground water around beach, drinking water for island, etc. |
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First step
It is for obtaining drinking water by combining concentration water from the 1st membrane and final treatment water from the 2nd membrane. The principle is to produce fresh-water of under 500mg/L through High recovery, which can endure 100 air-pressure & 99.5% salt remove ratio, and 1st membrane against seawater of 35,000~36,000mg/L. It is much economical than the others. The 2nd step
It is to obtain final treatment water from the additional system with the 1st membrane water. It produces sea-water of 3000~ 4500mg/L of salt ratio, and produce fresh-water of under 500mg/L by the later process. Both process need 90~95% salt remove ratio with 70~80 air-pressure. Compare to Single stage system, Double stage system has attractive point to get much lower salty & high quality water. |
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Factor and material |
Effect for semipermeable membrane |
Process method |
hydrogen-ion concentration |
Induction of oxidation for membrane |
Control by acid drugs and alkali drugs (Ph6~8) |
Microorganism |
Corrosion of membrane surface by using slime |
CA membrane : injection of (Cl2) and filtration of active carbon
PA membrane : injection of (Cl2) and transmission of ultraviolet (when injection of (Cl2), before flow R.O you must change from electric Cl2 to active carbon or SBS |
organism |
Induction of block for membrane |
Adhesion and filtration of active carbon or removal by injection Cl2 and chloric acid |
Fe and Mg |
Formation of Scale on surface of membrane |
oxidation, filtration and contact oxidation filtration (using of sulfurous acid soda) |
silica |
Formation of Scale on surface of membrane |
indissolubility : removal by Filtrationsolubility : removal by injection magnesium hydroxide |
Water temperature |
Induction of the crack of membrane |
Control of water temperature by heat changer(20 ℃ ~ 25 ℃ ) |
mineral |
Formation of the sediment on surface of membrane |
Treatment of dissolution ion and changeable reaction by injection of 킬레이트제 or chemical compulsion sedimentation |
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