What is Activated Carbon Regeneration Regeneration Methods of Activated Carbon

What is Activated Carbon Regeneration

Activated carbon regeneration (i.e. reactivation) refers to the removal of adsorbed material from activated carbon by physical or chemical methods without destroying the original structure of activated carbon, and restoring its adsorption performance for the purpose of reuse. Before choosing the activated carbon regeneration method, it is important to have a clear understanding of the treated object and the scale of treatment.

The process of adsorption is a process in which the activated carbon, adsorbate and solvent form an adsorption equilibrium. To let the activated carbon desorb and restore its activity, the original equilibrium conditions must be broken, whose basis are as follows:

External heating to raise the temperature to change the equilibrium conditions, as the amount of adsorbed mass decreases with increasing temperature, thus desorbing the adsorbed mass.
Changing the chemical properties of the adsorbate.
Extracting the adsorbate with a solvent that has a strong affinity for the adsorbate.
Replacing the adsorbate with a substance that has a high affinity for the activated carbon, and then desorbing the replacement substance and regenerating the activated carbon.
Lowering the concentration (or pressure) of the solute in the solvent to desorb the adsorbate.
Removing the adsorbed material (organic matter) by decomposition or oxidation.
Regeneration Methods of Activated Carbon
There are various regeneration methods for activated carbon, like thermal regeneration method, biological regeneration method, wet oxidation method, solvent regeneration method, electrochemical regeneration method, catalytic wet oxidation method, etc.

Technical advantages of the process

It turns out that the activated carbon regeneration process is a one-step method, that is, after the waste carbon is dried, it directly enters the fluidized activation furnace for carbonization and activation. During the activation process, a large amount of steam needs to be added for surface oxidation reaction. The generated flue gas and the high-temperature desorbed organic flue gas are mixed and then enter the tail gas treatment system to be heated to 1100°C for denitrification treatment. The total amount of flue gas at this time is about 8000-10000N.M3/h, and the required fuel is converted into 350N.M3/h natural gas, which consumes a lot of energy.
The latest process features are: after drying the waste carbon, it is carbonized at high temperature in an advanced static furnace to desorb and analyze more than 95% of the organic matter in the waste carbon. During this process, the static furnace is completely anaerobic, and the organic matter produced is The amount of flue gas is very small. After spray washing, most of the organic matter and ash are dissolved in the water. When the circulating washing water COD reaches a certain concentration, it enters the waste liquid disposal workshop. At this time, the amount of harmful flue gas entering the tail gas treatment is very large. Small, the air volume is about 1000N.M/h, plus the amount of flue gas generated during drying, the air volume is about 5000M3/h, which is about 50% of the original process, which greatly reduces the energy consumption of exhaust gas treatment. The carbonized carbon, Then it enters the fluid activation furnace for activation. At this time, the tail gas of the fluid activation furnace can be completely emptied directly.
The optimized process has low requirements for ash content, organic matter content, etc. in the waste carbon market (even waste carbon from sewage plants can be carbonized). It can also provide different qualities of recycled carbon according to the requirements of recycled carbon dealers. Make the operation of the entire project flexible. At the same time, reducing treatment costs can also face the impact of future disposal prices due to the rise of the incineration industry.