Calculating the Antiscalant feed Dosage



Antiscalant Chemical is a widely used product in every industry for cleaning the RO Plant. There exists a possibility for Calcium, barium, strontium, halide, and silicon oxide compounds to precipitate within the concentrate or brine channels of the Reverse Osmosis Membranes. Precipitation happens once the solubility limits of those varied salts and silicon oxide are exceeded. Today in this blog, we will discuss the amount of Antiscalant required for Dosing in the RO Plant.

How does the scale deposit form in your RO System?

As pure water is forced through the membrane under pressure, the salt concentration on the brining part of the RO Membrane will increase since the solvent (pure water) is being transported through the membrane that acts as a barrier to the salts. As the salt concentration will increases the smallest amount of soluble salts can begin to create micronuclei particles. These mixes are eventually formed by the insoluble salt crystals. If these crystals are permitted to go unchecked, they will eventually form scale deposits on the RO Membrane surface. Excessive scale build-up can cause the RO Membrane part to lose its potential because of enlarged polarization or in extreme cases plug the membrane channels.

How can we stop the scale formation?

To inhibit mineral scale formation a specially developed organic chemical compound (scale inhibitor) is injected into the raw water stream. This RO Antiscalant can facilitate disperse suspended matter present within the raw feed water stream alter crystal growth of mineral scales and sequester micro- nuclei to forestall crystal growth.

How much amount of Dosage is required to stop the scale formation?

The amount of dose required to prevent scale formation within the RO Membrane is set by the concentration of varied constituents within the brine solution. The need for scale matter addition is site-specific depends on feed flow, raw water analysis, and computer-generated predictions for the particular RO Membrane being used. Normally, a scale inhibitor/Antiscalant requires a minimum of 2- 5 milligrams per liters (mg/L) to prevent scaling.

How to calculate the Antiscalant feed dose?

For sample calculations, we’ll assume to understand this calculation properly 

Feed Flow: 420 GPM

Specified Dose: a combine of 1.21 mg/l neat solution (provide by chemical supplier)

Anti-Sealant Density: 10.5 lb/gallon

420 gal/min * 1440 min/day = 604,800 gal/day

1.21 mg/l (ppm) * 8.345 min/day * 604,800/1,000,000 = 6.10 lb/day

6.10 lb/day / 10.5 lb/gal = 0.58 gal/day per train

0.58 lb/day * 3789 ml/gal = 2197.62 ml/day


2197.62 ml/day / 1440 min/day = 1.52 ml/min


Therefore, the dosage is to be set at the dosing pump to 1.52 ml/min for this specific example.

Pearl Water Technologies offers you productive RO Antiscalant at your budget. Our products are ISO Certified. You can visit our site to get the details of our product: https://pearlwater.in/antiscalant. If you have any queries, then feel free to call our expert at 9582215137.

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