Can Activated Carbon Be Reused?

As a leading Chinese water treatment chemical manufacturer, we produce high-quality activated carbon widely used in industrial wastewater, drinking water purification, and environmental treatment. Many clients ask: “Can activated carbon be reused?” The answer is “Of course!”

Can Activated Carbon Be Reused?

Activated carbon has a high surface area and porous structure. Its adsorption capacity decreases over time, but it can be regenerated and reused, especially in industrial and municipal water treatment, reducing costs and improving resource utilization.

Factors Affecting Activated Carbon Lifespan

    1. Type of contaminants – High organic load, oil, or heavy metals accelerate saturation.

    2. Water pH – Acidic or strong alkaline conditions can damage pores.

    3. Operating temperature – High or fluctuating temperatures reduce adsorption.

    4. Particle type and size – Granular carbon (GAC) is more suitable for reuse than powdered carbon (PAC).

    5. Usage mode – Continuous flow, flushing frequency, and contact time influence lifespan.

How to Reuse Activated Carbon

Thermal Regeneration

     ● High-temperature heating or steam removes adsorbed contaminants

     ● Restores pore structure and adsorption capacity

     ● Suitable for GAC

Chemical Regeneration

     ● Acids, alkalis, or solvents remove specific pollutants

     ● Restores adsorption for heavy metals or refractory organics

Soaking and Washing

     ● Simple water or salt water rinse

     ● Suitable for lightly contaminated water, limited adsorption recovery

Reuse Frequency by Carbon Type

     ● Granular Activated Carbon (GAC): 3–5 times

     ● Powder Activated Carbon (PAC): Typically single-use

     ● Modified or specialty carbons: Depends on regeneration and contaminant type

Note: Reuse depends on contaminant type, water quality, and regeneration method; monitor adsorption performance regularly.

Precautions for Reused Activated Carbon

    1. Monitor adsorption capacity – Check iodine number, toluene adsorption, etc.

    2. Avoid cross-contamination – Prevent mixed pollutants during regeneration

    3. Proper storage – Keep dry, sealed, away from strong acids, bases, or solvents

    4. Safety – Use PPE when regenerating to avoid dust inhalation

FAQ

Q1: Can activated carbon be reused?
A1: Yes, especially granular carbon with thermal or chemical regeneration.

Q2: Can powdered activated carbon be reused?
A2: Usually single-use; reuse not recommended.

Q3: How is reuse frequency determined?
A3: Based on water quality, contaminant type, regeneration method, and adsorption tests.

Q4: Will adsorption efficiency decrease after reuse?
A4: Yes, regular monitoring and timely regeneration or replacement are necessary.