Active aluminum oxide desiccant is a porous material with adsorption properties and catalytic activity, characterized by high dispersion and large specific surface area. It is suitable for drying various gases and liquids, serving as an adsorbent, desiccant, catalyst, and carrier in many reaction processes in petroleum, fertilizers, and chemical industries. This product is made from high-purity aluminum oxide, scientifically formulated and catalytically refined. It has high compressive strength, long service life, and can be reused repeatedly through regeneration methods. The principle of defluorination involves the adsorption of fluoride onto the surface of the adsorbent, forming insoluble fluorides. Meanwhile, the SO42– on the adsorbent can exchange with other anions such as F- and HCO3ˉ in water. The adsorbent can be placed in a filter bed, generally with a thickness of 700~1000mm and particle size of 0.5~2.5mm, at a filtration rate of 1.5~2.5m/n. The supporting layer uses pebbles, with a thickness of 400~700mm, and the pH of the raw water is adjusted to 5.5~6.5 with acid. By using small particle activated aluminum oxide, which has a large specific surface area, the defluorination effect can be improved, reducing water production costs. When the defluorination capacity of the activated aluminum oxide adsorbent does not meet standards, an aluminum solution of 1%~2% can be prepared and passed through the filter column at a flow rate of 0.6m/n for 6~8 minutes to regenerate it, allowing for repeated use. This method has a strong defluorination capacity and is an excellent technology for removing fluoride and various inorganic ions. Typically, activated aluminum oxide is produced by calcining aluminum hydroxide at temperatures between 400℃ and 600℃ or by burning conventional aluminum oxide with alkaline metal ions at temperatures between 400℃ and 500℃ to form white, granular porous adsorbents. //// Adsorption Function of Activated Aluminum Oxide Desiccant Activated aluminum oxide desiccant is a multi-microporous spherical substance with strong adsorption capabilities, a large specific surface area, high compressive strength, and a long service life, which can be reused through regeneration methods. This product is a white, spherical porous material that is non-toxic, odorless, non-pulverizing, and insoluble in water. It is widely used in industries such as petrochemicals, chemicals, textiles, and metallurgy for instrument air drying and in pressure swing adsorption air separation devices, with a dew point adsorption capability reaching above -41 degrees. It can also be used for deep drying of liquid and gaseous phases in steel, petroleum cracking gas, ethylene, and propylene. Activated aluminum oxide, also known as reactive alumina, has the English name Activated Alumina or Reactive alumina; activated aluminum oxide. In catalyst applications, aluminum oxide is commonly referred to as "activated aluminum oxide." It is a porous, highly dispersed solid material with a large surface area, and its microporous surface possesses the necessary characteristics for catalytic action, such as adsorption performance, surface activity, and excellent thermal stability. Therefore, it is widely used as a catalyst and catalyst carrier in chemical reactions. The spherical activated aluminum oxide pressure swing oil adsorbent consists of white, spherical porous particles with uniform particle size, smooth surface, high mechanical strength, and strong hygroscopicity. After absorbing water, it does not swell or crack, maintaining its original state. It is non-toxic, odorless, and insoluble in water. Activated aluminum oxide is an efficient drying agent for deep drying of trace water. It is very suitable for non-thermal regeneration devices. //// Main Factors Affecting the Adsorption Performance of Activated Aluminum Oxide: (1) Particle Size: The smaller the particle size, the higher the adsorption capacity, but smaller particle sizes also reduce particle strength, impacting its service life. (2) Raw Water pH: When the pH is greater than 5, a lower pH results in higher adsorption capacity of activated aluminum oxide. (3) Initial Fluoride Concentration of Raw Water: A higher initial fluoride concentration leads to a larger adsorption capacity. (4) Alkalinity of Raw Water: High concentrations of bicarbonate in raw water will decrease the adsorption capacity. (5) Chloride Ions and Hydroxyl Ions. (6) Influence of Arsenic: Activated aluminum oxide has an adsorption effect on arsenic in water. The accumulation of arsenic on activated aluminum oxide reduces its capacity to adsorb fluoride ions and makes it more difficult to elute arsenic ions during regeneration.