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Thermal recovery of activated carbon (thermal reactivation)

July 27, 2025
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Thermal regeneration of activated carbon is    an important process in water and air purification systems, allowing for the reuse of loaded activated carbon. This process is not only cost-effective, but also offers significant environmental benefits. This article provides a comprehensive analysis of the thermal regeneration process, its advantages and disadvantages, and its applications in various industries.

Heat recovery process with activated carbon

Main phases of heat recovery

  1. Pre-treatment and drying    :

    • Drying from 100 to 150°C

    • Separation of large particles and physical impurities.

  2. Pyrolysis    :

    • Heat to 500–700 °C in an airless environment.

    • Decomposition of organic matter adsorbed on carbon surfaces

  3. Reactivation    :

    • Use steam at 800-900 °C.

    • Unclogs pores and creates a new pore structure.

  4. Let cool, then prepare    :

    • Reduce the temperature of the coal to room temperature.

    • Sieving and sorting particles for reuse

Key criteria in the process

  • Temperature: 600-900°C

  • Duration: 30-60 minutes

  • Process atmosphere: nitrogen or water vapor

  • Initial humidity: less than 50%

Advantages of heat recovery

Economic benefits

  • Reduce your cost of purchasing new activated carbon by 40-60%.

  • Save on delivery and disposal.

  • Improve your initial ROI

Environmental

  • Reduction of the generation of hazardous waste

  • Reducing the consumption of natural resources

  • Reduction of the CO2 footprint of the production cycle

Specifications

  • Retains 80-95% of original absorption

  • Ability to customize surface properties for specific applications

  • Reduces problems associated with handling saturated coal

Disadvantages and problems of the procedure

Technical limitations

  • The absorbency gradually decreases after each cycle .

  • Material loss of 5 to 15% per cycle

  • This requires complex equipment and a lot of energy.

Operational problems

  • Formation of  toxic compounds   in exhaust gases

  • Risk of accidental burns during operation

  • Continuous  monitoring of process parameters is required  .

Industrial applications of heat recovery

Water treatment industry

  • Processing    of activated carbon    in municipal wastewater treatment plants

  • Reuse and removal of organic compounds from drinking water

Chemical and petrochemical industry

Food & Pharmaceutical Industry

  • Activated Carbon Processing  for  Sugar Color Removal

  • Reuse in the edible oil refining process

pulverisierte Aktivkohle

New heat recovery technology

Improved circulation system

Recycling of microwave ovens

  • Reduce processing time by up to 50%

  • Energy saving

Use of a catalyst

  • Reduce the temperature required for activation

  • Improving the quality of recycled carbon

Rules and regulations

Internationale Standards

  • ASTM D3466 Standard for Evaluation    of Renewable Activated  Carbon

  • EPA Guidelines on Process Emissions

Safety measures

  • Systems for controlling     hazardous gas emissions

  • Special fire extinguishing equipment

  • Safety precautions when working with hot materials

At last

Thermal recycling of activated carbon is an effective way to reduce costs and protect the environment. Despite    technical challenges,    advances in recycling technology in recent years have made the process attractive to a wide range of industries. The development of more efficient and energy-efficient processes is promising for this technology.