Dealkalizers are acidic medium cation exchanges that are mostly used to treat water with significant bicarbonate hardness. Removing bicarbonate hardness reduces scale and corrosion, assuring the dependability of other water purification devices. The capacity of water to neutralize acid is measured by alkalinity. Depending on the pH of the water, there are three sorts of alkalinities: bicarbonate, carbonate, and hydroxide. The pH of bicarbonate (HCO3) ranges from 4.3 to 8.3. Bicarbonate is now the most common kind of alkalinity found in natural water bodies. The pH of carbonate (CO3) ranges from more than 8.3 to 10. When the pH is more than 10, there is hydroxide (OH) alkalinity.

You must consider the benefits and drawbacks of any capital expenditure, like as a dealkalizer, in your plant, just as you do with most mechanical or chemical problems. A properly sized and fitted dealkalizer could save you money, time, and difficulties if it is suited for your system. A trained and professional water treatment business can assist you through this procedure and evaluate if a dealkalizer is indeed the best solution for your location.

work process

Alkalinity in raw water can be lowered using a variety of ways, including:

  • Reverse Osmosis - Membrane filtration has grown in popularity as a boiler water treatment method. Almost all carbon dioxide may be removed from RO-treated feedwater with proper pre-treatment. Reverse osmosis may remove up to 98 percent of all mineral salts at the same time, considerably decreasing alkalinity and containing the characteristics - minimizing minerals. With reverse osmosis, boiler cycles can be expanded to 50 or more.
  • Chloride Anion Dealkalizers - Chloride anion dealkalizers work similarly to ion exchange water softeners, with the exception that the filtering vessels contain Type II strong-base anion resin. For resin regeneration, two approaches are available. The first use salt, whereas the second employs a salt-caustic mixture (NaOH). Wastewater should be softened in most circumstances when a dealkalizer is necessary to avoid boiler scale build-up. Combinations of salt and caustic have a greater capacity for alkalinity until regeneration is necessary.
  • Weak Acid Dealkalization - When the salt concentration to alkalinity ratio is 1 or above, a strong acidic cation (WAC) resin provides considerable cost savings. A WAC resin swaps hydrogen for the harshness associated with the alkalinity of the water. The carbon dioxide is then removed by degasification. If required, a little amount of caustic might be added to elevate the ultimate pH level.
  • Split Stream Dealkalization - Split stream dealkalization employs two parallel beds of strongly acidic cation (SAC). One bed is sodium-based and functions as a cation softener. Other layer operates in hydrogen form and functions as a demineralizer's cation vessel. Typically, sulfuric acid is employed to renew this bed. The flow of feedwater is shared between two vessels. The water soft by the sodium-based container has no alkalinity, but the water softened by the hydrogen container contains no alkalinity.
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