Packing refers to a material that is filled in other objects.

In chemical engineering, a filler refers to an inert solid material contained in a packed column, such as a Pall ring and a Raschig ring, etc., which acts to increase the gas-liquid contact surface and strongly mix them with each other.

In chemical products, fillers, also known as fillers, refer to solid materials used to improve processability, mechanical properties of the product, and/or reduce costs.

In the field of sewage treatment, it is mainly used in the contact oxidation process, and microorganisms will accumulate on the surface of the filler to increase the surface contact with the sewage and degrade the sewage.

Advantages: simple structure, low pressure drop, easy to manufacture with corrosion-resistant non-metallic materials. It is suitable for gas absorption, vacuum distillation, and handling of corrosive fluids.

Disadvantages: When the tower neck is enlarged, it causes uneven distribution of gas and liquid, poor contact, etc., resulting in a decrease in efficiency, which is called amplification effect. At the same time, the packed tower has the disadvantages of large weight, high cost, troublesome cleaning and maintenance, and large loss of filler.