Activated carbon has good adsorption properties for wastewater containing water-soluble dyes such as cationic dyes, direct dyes, acidic dyes, and reactive dyes; However, for wastewater containing insoluble dyes such as sulfur dyes and reducing dyes, due to their low solubility and long adsorption time, activated carbon can hardly adsorb or adsorb them very little.
What activated carbon is used for dyeing wastewater treatment?
Activated carbon used as an adsorbent includes powder, soft granular, and granular forms. Soft granular activated carbon has poor hardness and is easily crushed when liquid passes through. Generally, granular activated carbon is preferred. The Biological Activated Carbon (BAC) method utilizes external enzymes secreted by added microorganisms to infiltrate the microporous structure of carbon, causing the organic matter adsorbed by activated carbon to continuously decompose into carbon dioxide, water, or synthesize new cells, and finally permeate the structure of the carbon and be removed. The catalytic oxidation method of activated carbon can greatly prolong the regeneration cycle of activated carbon. Regularly replacing expired activated carbon can save expensive regeneration costs.
Specification of activated carbon for dyeing wastewater treatment
The design data of carbon columns used for decolorization treatment of dyeing wastewater in China are generally as follows: carbon column diameter of 2-3m, carbon column height of 3m, total residence time of about 30min; The gas to water ratio is 4:1.
