Five Influencing Factors Of Activated Carbon Wastewater Treatment

Since the adsorption process and action principle involved in activated carbon water treatment are relatively complex, there are also many influencing factors. Mainly related to the nature of activated carbon, the nature of pollutants in water, the process principle of activated carbon treatment, and the selected operating parameters and operating conditions.

1. Properties of activated carbon The activated carbon used for water treatment should have three requirements: large adsorption capacity, fast adsorption speed, and good mechanical strength. In addition to other external conditions, the adsorption capacity of activated carbon is mainly related to the specific surface of activated carbon; the adsorption speed is mainly related to the particle size and pore distribution of activated carbon. The activated carbon used for water treatment requires a well-developed transition pore (radius of 20 to 1000 Angstroms), which is good for adsorption Mass (pollutants in water) diffuses into the micropores. The smaller the particle size of activated carbon, the faster the adsorption speed, but the loss of water head should be increased, generally in the range of 8-30 mesh. The mechanical wear resistance of activated carbon affects the service life of activated carbon.

2. The nature of the pollutants The adsorption capacity of the same activated carbon for different pollutants is very different. Due to the different solubility, molecular structure, polarity and concentration of pollutants in water, the adsorption capacity of activated carbon varies greatly.

3. Temperature Because the adsorption process is an exothermic reaction, the adsorption heat is small during liquid phase adsorption. When the water is treated with activated carbon, the temperature has no significant effect on the adsorption.

4. The effect of the coexistence of multi-component pollutants when applied to the treatment of water by adsorption, usually water is not a single pollutant, but a mixture of multi-component pollutants. During adsorption, they can co-adsorb, promote or interfere with each other. In general, the adsorption capacity of multi-component adsorption is lower than that of single-component adsorption.

5. Adsorption operation conditions Because the activated carbon liquid phase adsorption, the external diffusion (liquid film diffusion) speed has an effect on the adsorption, so the type of adsorption device, contact time (water flow rate), etc. have an effect on the adsorption effect.