The replacement cycle of activated carbon in a VOC exhaust gas treatment system depends on several operating conditions, including VOC concentration, airflow volume, gas composition, humidity, and daily operating hours. When the concentration of organic compounds is relatively low, activated carbon can typically be used for 6 to 12 months. However, for higher VOC concentrations or continuous industrial operation, the replacement cycle may be shortened to 3 to 6 months.

During operation, the adsorption capacity of activated carbon gradually decreases as pollutants accumulate in the pores of the carbon material. Once the carbon becomes saturated, the purification efficiency of the system may decline and odors or VOC emissions may increase.

To ensure stable system performance, it is recommended to regularly monitor exhaust gas concentration, pressure drop across the carbon bed, and system operating conditions. Proper maintenance and timely carbon replacement can maintain high purification efficiency, extend equipment service life, and ensure compliance with environmental emission standards.