PURPOSE: To provide a method and apparatus for treating waste gas in which waste gas treatment is performed to the high concentration and with high efficiency and at a low operating cost by performing the electrostatic sticking of mist and high boiling point substances and the adsorption of harmful/odorous gas by electrified powdery adsorbents.

CONSTITUTION: Powdery adsorbents are carried by an electrifying pneumatic carrying means 10A to be electrified and are transferred to an adsorptive pneumatic carrying means 1 to mix them in gas to be treated 8, permitting the sticking and adsorption to be executed. Next, the adsorbents and the gas to be treated 8 are separated by a separation means 2 and the separated adsorbents are subjected to heating treatment by adsorbent regeneration means 3, 4. As a result, harmful/odorous gas components are desorbed and mist and high boiling point substances are thermally decomposed to execute regenerating treatment to the adsorbents. The regenerated adsorbents are returned to the adsorptive pneumatic carrying means 1 by an adsorbent pneumatic feeding means 5 to mix them in the gas to be treated 8 and on the other hand, the gas components separated from the adsorbents are transferred to harm removing treatment means 6, 7 to effect harm removing treatment.