Prior to boiler, cooling, and reverse osmosis systems, water softeners are ion exchange systems created to remove the calcium and magnesium ions, which forms scale. The softer capacity, which can be represented in either grains or gallons, is the amount of hardness a softening can remove between regenerations.
Let’s understand some of the calculations of water softener’s resin capacity.
What is resin capacity?
A test carried out in the lab using a titration methodology can be used to assess resin capacity, which is a measurement of total capacity. For instance, a determined amount of cation resin is thoroughly rinsed after being totally converted, to the hydrogen (H) form using an excess of strong acid. The resin is then completely exhausted by the passage of a defined amount of caustic (NaOH). Then the waste is collected.
The sodium (Na) ions that the resin failed to catch are represented by the NaOH that went through the column. To neutralize this solution, acid is added and the necessary amount is expressed in equivalents.
The total equivalents of Na caught by the resin are calculated as the difference between the total equivalents of NaOH, passing through the column and the NaOH leaving the column. The resin's capacity is then calculated. Similar to this, an anion resin would undergo complete regeneration with NaOH and exhaustion with acid to determine its capacity.
How is the resin capacity calculated in a water softener?
Normally, the product's supplier's Data Sheet mentions the resin exchange capacity.
Normal resin capacity for cationic exchange is 55/liter.
As a result, one unit of resin equals = (Feed Hardness in ppm X Water Quantity in m3) /Exchange capacity.
How much salt is needed?
A certain amount of water is needed to dilute a 100% solution.
Say, 320 grams of NaCl dissolved in a liter of water at 20 degrees Celsius.
Add 3440 liters of water to create a 10% solution.
Then, begin the backwash process for an additional 40 minutes.
After a brief washing to bring the hardness below 5 ppm, the unit is now ready to start extracting up to 100 m3. Feed pressure must be kept between 1.5 and 2 bars, and exchange capacity is crucial; it varies from product to product.
Is the capacity of every resin the same?
Depending on the user's needs, each type of resin may convey capacity in a different way. Strong acid cation (SAC) resins are cation resins used for softening. They are frequently utilized in the hydrogen (H) form, for demineralization as well as the sodium or potassium forms for softening.
The literature specifies the capacity for the resin's Na form, even though the resin may be run in the H form. Because, the resin expands by around 5–6% when switching from the Na to the H form, some of the newer literature will report the capacity in H form, and it is always lower than Na form.
What do we offer?
Netsol Water is one of India's top producers of water treatment facilities. In order to provide our customers a solution created to operate with our purification and filtration plant, we have introduced a specific line of water softeners and RO Plants.
We provide design as well as installation of these water treatment facilities, as well as educate our clients on how to avoid water pollution, by employing a long-term approach and cutting-edge wastewater treatment procedures.