A composite defluoridation agent is a chemical agent specially designed to remove fluoride ions from wastewater. This type of defluoridation agent is usually composed of multiple ingredients, designed to improve fluoride removal efficiency and reduce costs.
The components of composite defluoridation agents may include:
Polyhydroxy compounds: such as certain organic acids, which can form stable complexes with fluoride ions. Polycarboxyl compounds: such as trifluoromethanesulfonic anhydride, octanoyl chloride, 1R-(-)-camphorsulfonic acid, 3-furoic acid, n-valeryl chloride, butane tetracarboxylic acid, etc., these compounds can react chemically with fluoride ions. Inorganic substances: such as calcium salts (such as calcium chloride, calcium sulfate), magnesium salts, aluminum salts, phosphates, iron salts, etc., these inorganic substances can form insoluble precipitates with fluoride ions.
The working principle of composite defluoridation agents is usually based on chemical precipitation or adsorption. Fluoride ions can react with certain components in the composite defluoridation agent to form insoluble fluoride precipitates, which can be removed from water.
By controlling the pH value, temperature and other conditions of the solution, specific inorganic substances and fluoride ions form precipitation. Without significantly changing the original sewage treatment system, the fluoride content can be reduced by adding defluoridation agents. This includes adding defluoridation agent storage tanks, dosing pumps and pH detectors to quickly reduce the fluoride content with small investments and low operating costs. The defluoridation effect is affected by factors such as the location of agent addition, dosage, pH control and the selection of auxiliary flocculants (such as polyacrylamide PAM). For example, adjusting the location of PAM addition (from the inlet to the outlet of the coagulation sedimentation tank) and type can improve the defluoridation efficiency. Controlling the pH value of the reaction solution is crucial to the defluoridation effect, because different pH conditions may affect the form of fluoride and the activity of the defluoridation agent.
Wastewater defluoridation is a process involving the combination of agent selection, process optimization, pH adjustment and possible deep treatment, which requires careful adjustment and monitoring according to specific water quality conditions.
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