Microwave desorption and regeneration methods for activated carbon with adsorbed radon

This paper introduces a microwave desorption and regeneration methods for activated carbon with adsorbed radon. The influencing factors and objectivity in the process of desorption were tested, and the feasibility of the microwave regeneration of activated carbon with adsorbed radon was analyzed. The results showed that activated carbon with adsorbed radon can be heated uniformly by microwave, after 20min of heating, the temperature differences between different depths in the activated carbon were within +/- 6 degrees C; When the temperature reaches 150 degrees C, the microwave takes three minutes, and the electric heating takes 9min, the energy consumption of microwave heating is lower, and the cooling performance after microwave heating was better than that after electric heating. A better desorption rate was achieved with a higher microwave power, a constant airflow rate (an airflow rate that is too high or too low will reduce the desorption rate), a higher moisture content and a lower activated carbon packing density. The effect of microwave desorption activated carbon is remarkable, in our experiment, the maximum desorption rate of the activated carbon reached 97.6%;The loss rate of the activated carbon after regeneration was low, and the total loss rate was 2.65% after five cycles of continuous absorption and desorption. The results can provide guidance for the development of key desorption technologies for implementation in radon reduction devices based on activated carbon.