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Introduction: Horizontal spiral centrifuges can generally be divided into horizontal spiral filtration centrifuges and horizontal spiral sedimentation centrifuges. A horizontal screw centrifuge is a type of horizontal sedimentation equipment with screw-type discharge that operates continuously. The working principle of such a centrifuge is as follows: the drum and the screw rotate at high speeds in the same direction, but at different speeds. Materials are continuously introduced into the inner cylinder of the conveying screw through the feed pipe; after gaining speed, they enter the drum. Under the action of centrifugal force, the heavier solid particles settle on the walls of the drum, forming a sludge layer. The feed screw continuously pushes the deposited solid matter toward the cone end of the drum, where it is discharged outside the machine through the slag discharge port. The lighter liquid phase forms an inner liquid ring, which continuously overflows from the large-end overflow port of the drum and is discharged outside the machine through the drainage port. This machine can continuously feed, separate, wash, and discharge materials while operating at full speed. It features a compact structure, continuous operation, smooth performance, strong adaptability, high production capacity, and easy maintenance. Suitable for separating suspensions containing solid particles with a particle size greater than 0.005 mm and a concentration range of 2–40%. It is widely used in industries such as chemicals, light industry, pharmaceuticals, food, and environmental protection. Choosing the right horizontal screw centrifuge not only helps to resolve production issues and improve work efficiency, but it also saves on production costs and reduces operational risks. The main factors affecting the selection are as follows: 1. The rotation speed of the centrifuge: Generally, horizontal screw centrifuges should have a rotation speed of over 3000 revolutions per minute; the higher the speed, the greater the separation factor of the centrifuge, and thus the better the separation effect. 2. Material of the centrifuge: Different materials have varying physical and chemical properties such as wear resistance and corrosion resistance. For horizontal spiral centrifuges used abroad, the minimum acceptable material is 316L or duplex stainless steel; ceramic composite materials must be used for the wear-prone components. 3. Differential control of centrifuges: Different differential controllers have varying levels of control precision, and there are significant differences in their lifespan and maintenance costs. The higher the differential precision, the better the equipment’s ability to adapt to different materials; therefore, it is advisable to choose devices with high differential precision. 4. Length-diameter ratio: The higher the length-diameter ratio of a horizontal spiral centrifuge, the greater its processing capacity, and the lower the moisture content. 5. Installation power: It affects energy consumption control; generally, equipment in domestic countries has a higher energy consumption rate, while that in foreign countries is lower. 6. Processing technology: Horizontal screw centrifuges are separation devices that require high precision in manufacturing; products manufactured by companies lacking the capability for precision processing have a high failure rate and limited processing capacity. In terms of environmental protection applications, the spiral centrifuge is primarily used for dewatering the sludge generated during industrial and domestic wastewater treatment. With environmental issues becoming a concern for the whole world today, the value of horizontal screw centrifuges has become evident. In the past, sewage treatment plants and similar facilities relied on natural sedimentation or belt filter presses to dewater and concentrate sludge. Tests have shown that reducing the moisture content of sludge from 98% to 80% can reduce its volume by a factor of 10. For this reason, horizontal screw sedimentation centrifuges are widely used and promoted in the field of environmental protection, thanks to their advantages such as high processing capacity, automated operation, and effective dewatering performance. The sales volume of horizontal spiral centrifuges accounts for about half of all centrifuge products, which establishes their irreplaceable position. Abroad, horizontal screw centrifuges are the preferred choice for wastewater treatment equipment.