The document discusses the adsorption process for removing volatile organic compounds (VOCs) from air or gas streams. It defines adsorption and describes how VOCs accumulate on the surface of adsorbent materials like activated carbon. Fixed bed adsorption is commonly used, where the VOCs are removed as the contaminated air passes through a column packed with adsorbent. Key factors that influence the adsorption process include temperature, gas concentration, bed length, and regeneration of the adsorbent material. Common adsorbents for VOC removal include activated carbon beads and fibers, which can be used in continuous adsorption/desorption systems.