The effect of arsenic: activated alumina has an adsorption effect on arsenic in water, and the accumulation of arsenic on activated alumina forms a decrease in the adsorption capacity of fluoride ions, and makes it difficult to elute arsenic ions during regeneration.
Raw water PH value: When the PH value is greater than 5, the lower the PH value, the higher the adsorption capacity of activated alumina, the fluorine removal methods are roughly divided into the following types: adsorption filtration method; membrane method; flocculation precipitation method; ion exchange method, aluminum sulfate The solution concentration of the regenerant is 2-3%, and the consumption of aluminum sulfate can be calculated based on 60-80g of solid aluminum sulfate for every 1g of fluoride removed.
The main factors affecting the adsorption function of activated alumina balls: particle size: the smaller the particle size, the higher the adsorption capacity, but the smaller the particle size, the lower the particle strength, which affects its service life,
Activated alumina ball regeneration: the regeneration agent uses sodium hydroxide solution or aluminum sulfate solution. The initial fluorine concentration of raw water: the higher the initial fluorine concentration, the larger the adsorption capacity.
The solution concentration of sodium hydroxide regenerant is 0,75% -1%, the consumption of sodium hydroxide can be calculated according to 8-10g solid sodium hydroxide required for the removal of 1g fluoride, and the amount of regeneration liquid is 3- 6 times, chloride ion and sulfate ion, raw water with too high fluoride is often more alkaline, PH value is often greater than 7,5, activated alumina ball is divided into activated alumina ball desiccant, activated alumina ball defluorinating agent .