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Activated carbon is an indispensable filter material in water treatment. Activated carbon can directly affect the quality of water produced. The text will mainly introduce the influencing factors of activated carbon water treatment.
1. The effect of solution pH on the adsorption of activated carbon
The influence of pH value of the solution on adsorption should be considered comprehensively with the influence of activated carbon and adsorbate (solute). The pH of the solution controls the degree of dissociation of acidic or basic compounds. When the pH reaches a certain range, these compounds will dissociate and affect the adsorption of these compounds. The pH value of the solution will also affect the solubility of the adsorbate (solute) and the charging of the colloidal substance (solute). Because activated carbon can adsorb hydrogen and oxygen ions in water, it affects the adsorption of other ions.
The effect of activated carbon in the activated carbon filter to adsorb organic pollutants from water generally decreases with the increase of the pH value of the solution. When the pH value is higher than 9.0, it is not easy to adsorb. The lower the pH value, the better the effect. In practical applications, the optimal pH range is determined through experiments.
2. The influence of solution temperature
Because the adsorption heat is small during liquid phase adsorption, the effect of solution temperature is small. Adsorption is an exothermic reaction. Adsorption heat, that is, the total heat released by activated carbon adsorbing a unit weight of adsorbate (solute), with KJ/mol as the unit. The greater the heat of adsorption, the greater the effect of temperature on adsorption. On the other hand, temperature has an effect on the solubility of a substance, and therefore also has an effect on adsorption. When activated carbon is used to treat water, the effect of temperature on adsorption is not significant.
3. The influence of coexistence of multi-component adsorbates
When the adsorption method is used to treat water, usually the water is not a single pollutant, but a mixture of multi-component pollutants. During adsorption, they can be co-adsorbed to promote or interfere with each other. In general, the respective adsorption capacity of multi-component adsorption is lower than that of single-component adsorption.
4. Adsorption operating conditions
Because the external diffusion (liquid film diffusion) speed has an influence on the adsorption during the liquid phase adsorption of activated carbon, the type of adsorption device, contact time (water flow rate), etc. have an impact on the adsorption effect.
To sum up, there are many factors that affect the adsorption, which should be comprehensively analyzed, and the best adsorption conditions should be selected according to the specific situation to achieve the best adsorption effect.
