Biological Deodorization BoxMicrobial bio-fillers with a large surface area for attachment and growth, allowing microorganisms to form a biofilm on the bio-fillers in a suitable environment. The microorganisms in the biofilm utilize inorganic and organic substances from waste gases as carbon and energy sources, maintain their life activities by degrading malodorous substances, and decompose the malodorous substances into odorless substances like water, carbon dioxide, minerals, etc., achieving the goal of VOCs purification treatment.