the invention provides a multi - functional polymer - entrapped - cell - bead airlift bioreactor for odor or gaseous emission treatment . especially , it refers to a reactor that mainly treats a low - and - medium gas flow rate and concentration of volatile organic emission or odorous substances . particularly , it utilizes synthetic material and microbial entrapment technology as the microbial source and startup mechanism for gaseous emission and odor treatment . besides , plastic decomposing thiosphaera pantotropha can be added under certain condition to be triggered to breakdown the synthetic material to prevent wastes . this will achieve benefits in low cost , high efficiency and zero secondary pollution .