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Filler generally refers to the material that is filled in other objects. In chemical engineering, packing refers to inert solid materials, such as Bauer ring and Rashi ring, which are packed in the packed tower. Its function is to increase the gas-liquid contact surface and make them mix strongly with each other. In chemical products, fillers, also known as fillers, refer to solid materials used to improve processing performance, mechanical properties of products and/or reduce costs. In the field of wastewater treatment, it is mainly used in contact oxidation process. Microorganisms accumulate on the surface of fillers to increase the contact with the surface of wastewater and degrade the wastewater.