The method for removing ammonia using pellet activated carbon is mainly based on its physical and chemical adsorption, capturing ammonia molecules in the air through its porous structure. The following is a detailed description of this method:

Adsorption Mechanism:

Physical Adsorption: Ammonia molecules are adsorbed onto the large specific surface area of activated carbon (typically 500–1700 m²/g) through van der Waals forces. This process is reversible and applicable to a variety of pollutants.

Chemical Adsorption: Functional groups (such as acidic oxygen groups) on the surface of activated carbon form chemical bonds with ammonia molecules, enhancing adsorption capacity, especially after CO₂ activation treatment.

Key Performance Parameters:

Type: Nort Pellet Activated Carbon

Size: 3mm, 4mm, 5mm

Moisture Content:15%(max.)

Hardness: 95%(min.)

Phosphoric Acid Content:15%(min.)

CTC: 60%

Microporous Structure: Due to the small size of ammonia molecules, the micropore volume has the greatest impact on adsorption capacity; activated carbon with well-developed micropores is more efficient.

Mesopore Function: Mesopores facilitate the rapid diffusion of ammonia molecules, increasing the adsorption rate. Material Source: Made from raw materials such as coconut shells, wood, and coal through high-temperature activation. Coconut shell activated carbon, in particular, boasts a specific surface area of 1000–1600 m²/g, exhibiting excellent adsorption performance.

Application Scenarios and Implementation Methods:

Ventilation System Integration: In locations with high ammonia concentrations, such as pig farms, granular activated carbon is filled into filters and installed within ventilation ducts. Ammonia is adsorbed as air flows through.

Combined System: Combining biofiltration technology, utilizing the synergistic effect of microbial degradation and activated carbon adsorption to improve removal efficiency.

Other Applications: Also used for air purification in homes and vehicles, adsorbing pollutants such as ammonia and formaldehyde released from renovations.

Maintenance and Regeneration:

Replacement Cycle: Depending on the ammonia concentration and usage environment, filters typically need to be replaced every 3–6 months.

Regeneration Method: Exhausted granular activated carbon can be regenerated through high-temperature calcination at approximately 850°C, but each regeneration will result in a loss of 5–10% of its adsorption capacity.

Note: Adsorption performance gradually decreases after regeneration; ammonia levels need to be monitored to optimize maintenance costs.