The coconut shell activated carbon adsorption combination method mainly includes aeration/activated carbon adsorption combination method, biological treatment/activated carbon adsorption combination method, ozone oxidation/activated carbon adsorption combination method. My Jinhao coconut shell activated carbon manufacturer specializes in the principle and production of activated carbon / biofilm (biological activated carbon) method as follows:
The activated carbon adsorption-biofilm method for the tertiary treatment of printing and dyeing wastewater was studied. The method combines the activated carbon adsorption organic matter with the microbial oxidative decomposition of organic matter to synergistically, so the effect is superior, and the life cycle of activated carbon can be prolonged and reduced. Processing costs.
In the activated carbon/biofilm method, since activated carbon can selectively adsorb oxygen and enrich organic matter in water, it creates a good environment for microbial reproduction, and forms an aerobic biofilm on the surface of coconut shell activated carbon. This kind of activated carbon is also called Biolvgicat Activated Carbon (referred to as biochar. The term was proposed by Miller and Rice in 1978 and has been treated by domestic and foreign water treatment. As used by the people, there are three views on the specific meaning of biochar:
1 The combined process of ozone and granular coconut shell activated carbon is biological activated carbon method;
8 The microbial community is attached to the surface of the granule coconut shell activated carbon, which is the biological activated carbon method;
3 In the process of water supply and wastewater treatment, the water treatment method for growing aerobic microorganisms on coconut shell activated carbon is the biological activated carbon method.
[Regeneration of activated carbon and principle of activated carbon regeneration]
The regeneration of activated carbon is a process in which the activated carbon loses its adsorption capacity after use, and the adsorbed substance is removed by physical, chemical or biochemical methods to restore the adsorption capacity for reuse. With the use of activated carbon and the nature of the adsorbed material, the degree of difficulty in regeneration is different, and the regeneration method used is also different.
The adsorbed substances on activated carbon, depending on their properties, are in different adsorption states. One is in a physical adsorption state, and depends on the intermolecular attraction between the adsorbate molecules and the activated carbon, that is, van der Waals force is adsorbed on the activated carbon. The adsorbent in the physical adsorption state has a weak adsorption force with the activated carbon, and is adsorbed on the activated carbon in a multi-molecular layer state, and capillary aggregation occurs in the voids of the activated carbon, and is easily removed from the activated carbon during regeneration.
The regeneration of activated carbon utilizes some of the following principles:
1. Changing the chemical properties of the adsorbed material to reduce its adsorption capacity for activated carbon;
2. Dissolve it from activated carbon with a solvent having a high affinity for the adsorbed substance;
3. Displace the activated carbon from the activated carbon by using a substance having a higher affinity for the activated carbon than the adsorbed substance;
4. Using a heating method, the equilibrium state of the adsorption is destroyed, and the adsorbed substance is detached;
5. Reduce the concentration (or pressure) of the adsorbed substances in the surrounding medium to desorb;
6. Decomposition of the adsorbed substance into a low molecular substance by oxidative decomposition or microbial decomposition.
[The purpose and operation process of the powdered activated carbon process]
Zinc chloride method for intermittent production of powdered activated carbon, in order to reduce the investment in mechanical equipment, the mixture of wood chips and zinc chloride solution is not kneaded by a kneading machine, but a dip tank is adopted, and zinc chloride is impregnated. It penetrates into the wood chips and acts as a kneading machine.
The operation mode of the impregnation is slightly different from different manufacturers, but they are all similar.
Impregnation of powdered activated carbon generally takes the immersion tank, also known as the immersion tank. It is a pool made of brick and acid-resistant cement on the ground. The pool is long, wide and deep. The outer surface of the tank is coated with acid-proof porcelain sheets to prevent corrosion, and a drain pipe is arranged at the bottom of the tank for discharging excess zinc chloride solution after immersion.
When impregnating the powdered activated carbon, the wood chips that meet the requirements are put into the immersion tank, and then the zinc water pump is started, and the prepared and tested zinc chloride solution is evenly poured on the wood chips until the zinc chloride solution covers the wood chips. So far, after the immersion - hour, the drain port at the bottom of the immersion tank is opened, and the excess zinc chloride solution is allowed to flow into the zinc pool. After a while, the zinc swarf material can be transported to the carbonization step for carbonization.
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