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E-Sorption - Innovative Technology for Demineralized Water by Direct Current
E-sorption technology is the new way of desalinating solutions. So how does e-sorption differ to traditional technologies and where do we benefit to reverse osmosis?
So what is it?
E-sorption is based on coated electrodes with cation and anion membrane. Water is directed to the modules through a channel (spacer). Electrical current is applied whereas negatively charged ions are attracted to the anode and positively charged ions are attracted to the cathode. Result of this is a stream of lower salinity to the feed.
Based on the feed TDS and required TDS target correct power is applied to the module to drive the desalination process. Desalination between 30-99,5% can be achieved without extensive use of pre-treatment.
System works in dead-end mode; no waste is being produced during the production. After a pre-set time the applied potential is reversed and ions are being flushed away. Recovery between 50-95% can be achieved based on feed water quality and product requirements.
Fewer chemicals are needed because fouling and scaling occur much less compared to traditional reverse osmosis. Additionally, based on feed water quality ; typical applications do not require any pre-treatment. If they do, pre-treatment is typically less sophisticated resulting in more efficient OPEX, CAPEX and more straightforward, easy-going application.
Why is it?
The electrodes and the membranes are not a physical barrier like @ RO. Therefore it is much more resistant to fouling as well as to scaling. Iron is limited up to 10ppm, TSS up to 30ppm, hardness has no limits at all.
Benefits to RO?
Desalination: Salinity Tuning: E-sorption is tunable; power drives the process. When you add up on current or vice versa you achieve various desalination rates accordingly; between 20-99%. At the same time RO can only produce continuous quality or permeate to be blended.
Low Fouling and Scaling: E-sorption is not a pressure driven process; the propensity to fouling and scaling is minimal.
Pre-treatment: Limits on most of the ions are set higher than those prior RO. E-sorption works mostly without any significant pre-treatment. High chlorine tolerance, much higher limits on most of the ions compared to RO.
Beyond limits: E-sorption can treat extreme waters where RO cannot be applied. Applications such as brine recovery, mining water with extreme hardness and salinity , high iron are typical fields of application.
Robust and easy –to-operate: E-sorption not being a pressure driven process is a very friendly-to-operate. The product itself and operational set-up is very robust. E-sorption allows for frequent start/stops without decrease of life-time. Additionally, low maintenance requirements and low consumables.
OPEX and CAPEX: Certain applications allow for lower OPEX as well as CAPEX. Low energy consumption allows for efficient solar power energy feed.
Integrated technology E-hybrid: Smart integration of technologies allows for great results. E-hybrid features highest applicability to complicated brackish waters together with salinity tuning and surprisingly lower CAPEX than most of the technologies.
Durability: Longer life expectancy, higher recovery, similar desalination cut as RO.
Environment Friendly Technology: Chemical free operation, low energy consumption-low pressure desalination, higher recovery to RO, controlled waste water quality.
Where does E-sorption benefit?
Process Water Desalination: Any industrial process requiring desalinated water; process make-up water, cooling towers, rinsing and washing, product water for cosmetics, food and beverage, brewery make-up water, machine tools, laundry, waste water desalination etc.
Drinking Water Desalination: Desalination of water for human consumption, irrigation, animal consumption.
Water Tuning: Perfect ion composition for tasty tap water at home.
RO brine recovery & oil and gas industry: Salinity up to 100.000ppm, desalination of produced water for re-use, mining water reclamation.
Integrated technologies: Complicated brackish water desalination, agriculture, horticulture, irrigation, water for farm animals, wineries.
Environmental technology: Chemical -free desalination, chemical -free softening, chemical -free denitrification.