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What is the role of coal based activated carbon in water treatment?

Time of publication: 10:14, November 5, 2020

In the water quality pretreatment system, the activated carbon filter can absorb the residual chlorine which cannot be removed in the previous stage filtration, prevent the oxidation and decomposition of the later stage reverse osmosis membrane, and absorb the small molecule organic matters and other pollutants leaked from the front stage, which has obvious adsorption effect on the odor, colloid, pigment and heavy metal ions in the water, which can further reduce the SDI value of RO inlet water and ensure SDI < 5 TOC<2.0ppm。

The activated carbon filter works through a carbon bed. The activated carbon particles composed of carbon bed have many pores and large specific surface area, which have strong physical adsorption capacity. The pollutants are effectively adsorbed by activated carbon in water. In addition, there are oxygen-containing functional groups on the surface of activated carbon, and the organic pollutants in water passing through the carbon bed are effectively adsorbed by the activated carbon. Activated carbon filter is a common water treatment equipment. As the pretreatment of water treatment desalination system, it can effectively guarantee the life of the later stage equipment, improve the water quality and prevent pollution, especially the free residual chlorine poisoning pollution such as the reverse osmosis membrane and ion exchange resin.

 Coal based activated carbon

What is the commonly used activated carbon in activated carbon filter?

A: coal particle activated carbon and fruit shell particle activated carbon. Today's editor introduces the role of coal based granular activated carbon in water treatment

Coal particle activated carbon is made of fine anthracite and refined by advanced technology. It has the characteristics of reasonable pore structure, good adsorption performance, high mechanical strength, easy regeneration and low cost. Coal based granular activated carbon is mainly used for the purification of toxic gases, waste gas treatment, industrial and domestic water purification. It is suitable for the purification of raw water and tap water in power plants, especially the filtration and purification of chemical wastewater and the chlorine radical treatment of brackish water in power plant boilers, which has good treatment effect.

The main performance of coal based activated carbon is adsorption, which is related to the pore structure of activated carbon. The specific surface area and specific volume of micropores are large. Therefore, micropores determine the adsorption capacity of activated carbon to a large extent.

Physical adsorption and chemical adsorption are mainly produced on the surface of solid activated carbon.

Chemical adsorption is a monolayer adsorption, which can remove polar pollutants and metal ions from wastewater and waste gas.

Physical adsorption can form multi-layer adsorption, effectively adsorbing organic pollutants in wastewater and waste gas.

When an adsorbate contacts with the surface of the adsorbent, whether physical adsorption or chemical adsorption occurs depends on the surface activity of the adsorbent, the nature of the adsorbate, temperature and other factors.

In addition to adsorption capacity, industrial activated carbon also requires: (1) high mechanical strength and good wear resistance; (2) low energy required for desorption and easy regeneration; (3) stable structure and low carbon loss during regeneration.


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