Why does the color become darker with decolorizing activated carbon?

When activated carbon is decolorized, the color becomes darker, and it cannot be judged from the color alone, because after decolorization, whether the ultrafine activated carbon in the wastewater separates directly affects the color judgment, and the organic matter in the wastewater may deteriorate due to the prolonged contact time with air , coconut shell granular activated carbon An oxidation reaction occurs, which will cause color development. Why does the color become darker with decolorizing activated carbon?

There is a problem with the quality of activated carbon. A decrease in the iodine adsorption value will cause a decrease in the adsorption effect, and the original water color or the concentration of organic matter will increase.

Generally, the adsorption effect of decolorizing activated carbon has a direct effect on the PH value of water. The lower the pH, the better the adsorption effect. The lower the water temperature, the better the adsorption, the higher the water temperature, the better the desorption.

The fuller the contact between activated carbon and water, the longer the time, the better it is for adsorption. The contact time between activated carbon and water is generally controlled at more than 20 minutes, too short a time will reduce the adsorption effect. powdered carbon When the carbon-water mixture is stirred strongly and the carbon-water separation time is short, the decolorization effect will be reduced. The color of decolorized activated carbon will darken because of the above reasons.