All Reverse Osmosis (RO) feed waters are totally different in ionic composition. As a result, different kinds of scale might deposit on the membranes if the right Antiscalant isn't used. Choosing the proper Antiscalant and cleanup chemicals can optimize operative potency and facilitate stopping plant failure.
Below I tend to list a number of the foremost common sorts of scales that I've known on Ro membranes and also the acceptable chemicals to use.
We continuously suggest a membrane autopsy to make sure deposits are identified correctly.
Antiscalant for various types of scales formed on RO Membrane
Scale Species
Information
Antiscalant
Calcium Carbonate
Calcium Carbonate is that the common scale found in membranes. Seems like an off-white powder. Can be simply clean with a strong acid product.
Lemon juice and ordinary vinegar
Silica
Silica – is a scale that can be present on a membrane as colloids, aluminosilicates on the lead membrane components, or as scale on the ultimate components. Each forms are troublesome to get rid of, being keen about pH scale and temperature.
Lime Softening
Calcium sulfate
Calcium sulfate (gypsum) – crystalline structure with terribly sharp blade-like scales, that cut the membrane surface. Common incidence in areas wherever there's a natural sulfate content within the underlying earth science. This makes it terribly troublesome to scrub.
DTPA
Calcium Phosphate
Calcium Phosphate – seems in several forms. usually found in Ro membrane systems fed with wastewater or agricultural leachate, because of the high phosphate loading.
Brushite or DiCalcium Phosphate
Magnesium hydroxide
Magnesium hydroxide (brucite) – precipitates at a high pH scale, above 9.5, in membrane systems. is found in second pass elevated pH scale saltwater B rejection plants, wherever pH scale levels square measure accrued higher than 9.5 with the hydroxide to help B rejection. comparatively rare.
Caustic Soda
Barium sulfate
Barium sulfate (barite) – seems like white crystals, which might take on-blade-like formations. terribly troublesome to scrub effectively.
NuGenTec
Strontium sulfate
Strontium sulfate (celestine) – seems as crystals or as needles, which might harm the membrane surface. terribly troublesome to get rid of.
Schlumberger
Selecting an effective Antiscalant
Selecting the proper antiscalant is vital in providing optimum operative conditions for each ocean and briny water Ro Plant. Correct product application can facilitate to confirm the plant runs as expeditiously as doable. it's going to additionally scale back operational expenditure, through energy savings, reduced cleanup frequency, and increasing the lifetime of the membrane.
Feedwater Source
Application
Additional information
Sea water
Large systems, 1st and second pass, partial recycling
Potable use – NSF/UKDWI, iron sequestrant and dispersant
Sea water
Small/medium
Potable use – NSF/UKDWI
Sea water
Phosphorous free
Sea water
High sulphate
Modified ocean water
Sea water
Second pass, high pH, high recovery
Brackish water portion of B rejection ocean water plant
Brackish water
Broad spectrum, stressed water
Potable use – NSF/UKDWI
Brackish water
High calcium sulphate
Brackish water
High silicon dioxide feed
Volcanic areas, eg Canaries, Chile and Japan
Brackish water
High phosphate
Waste water apply, agricultural leachate
Brackish water
Systems incorporating concentrate recycle
Small systems
So from the above information, I hope you got the names of the Antiscalant Chemicals which should be used for cleaning of an RO Plant and avoid fouling in membrane.
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