How to use reverse osmosis scale inhibitor?

Dosing point of scale inhibitor

In order to achieve maximum efficiency, the special high-efficiency scale inhibitor/dispersant for reverse osmosis is best to be added before the static mixer or the Cartridge filter Housing. The actual output of the dosing metering pump must be calibrated before dosing. When dosing, note that it should be added continuously and proportional to the flow of water in order to maintain the recommended dosage level. Please ask the engineer to determine the dosing point according to the specific conditions of your system.

Dosage of scale inhibitor

The dosing dose is the dosage of the standard solution of the medicament required per unit volume of the water, that is, the concentration of the standard solution in the water. According to the water quality analysis report of the influent salinity, temperature, recovery rate, etc., a reference dosing dose is calculated. According to the specific conditions of the reverse osmosis system, the type of membrane and other conditions, determine and recommend the most suitable dosage.

Pharmaceutical preparation instructions

Reverse osmosis special high-efficiency scale inhibitor/dispersant can be directly added, or it can be added after being diluted in any proportion (diluted with RO product water or deionized water). The dilution concentration of the drug standard solution should not be less than 10% (w/w), and the diluted drug solution must be fully stirred to ensure uniform mixing.
In order to ensure that the scale inhibitor is injected into the RO system according to the recommended dosage, the following two methods can be added according to the actual situation.

Using method one of scale inhibitor:

Calibrate and determine the actual output of the dosing metering pump. According to the RO system inlet water flow and the recommended dosing dose, first calculate the concentration of the dispensed liquid. Then according to the volume of the pharmaceutical liquid to be prepared, calculate the amount of the pharmaceutical standard liquid required for the preparation of the pharmaceutical liquid.
Medicinal solution concentration (g/L) = injection volume of standard medicament solution per unit time (g/h)/actual output of dosing metering pump (L/h)
Among them: the injection volume of chemical standard solution per unit time (g/h) = influent flow (T/h) × dosing dose (g/T, ppm)
Dosage of standard drug solution (kg) = concentration of drug solution (g/L) × volume of drug solution (L)/1000 (g/kg)

Scaling inhibitor use method two:

Determine the concentration of the pharmaceutical standard liquid to dispense the pharmaceutical liquid, calculate the output of the required dosing metering pump according to the RO system water flow and the recommended dosing dose, and adjust the output of the metering pump.
Medicinal solution concentration (g/L)=medicament standard solution dosage (kg)/medical solution volume (L)×1000(g/kg)
The actual output of the dosing metering pump (L/h) = the injection volume of the standard drug solution per unit time (g/h)/the concentration of the drug solution (g/L)
Among them: the injection volume of chemical standard solution per unit time (g/h) = influent flow (T/h) × dosing dose (g/T, ppm)
Note: The above methods are all instructions for the preparation of pharmaceutical standard solutions. For concentrated products, the corresponding dosage can be determined according to the concentration ratio.

Professional tips on the use of scale inhibitors

  1. If the influent water contains high salt and iron compounds, long-term operation will deposit on the surface of the reverse osmosis membrane and cause pollution. This phenomenon must be controlled to prevent deposition on the surface of the membrane and avoid damage to the surface of the reverse osmosis membrane caused by the increased pressure difference.
  2. When you use other scale inhibitors, pay special attention to whether the flocculant you use is compatible with the scale inhibitor/dispersant, otherwise it will cause the reverse osmosis membrane to block.
  3. Pay attention to determine the reasonable dosage, too high or insufficient dosage will cause membrane fouling.
  4. The scale inhibitor product will freeze when the storage temperature is lower than the freezing point. If it freezes, it should be completely melted and stirred evenly before use, otherwise it will affect the accuracy of dosing.
5000ppm TDS brackish water

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