Printing and dyeing industry is a typical high-water industry consumes nearly million tons per year with demineralized water craft. Dyeing wastewater pollutant sources and composition is very complex, with changes in water quality, high organic content, high color (mostly colored dye) and other characteristics, direct emissions on human health and the living environment bring great harm, also causing water waste. As the state and society and the growing importance of sustainable development requires environmental protection requirements, the traditional approach has become increasingly difficult to meet production and environmental requirements. I produced a decanter centrifuge is a horizontal spiral unloading settlement equipment for continuous operation. This type centrifuge works as follows: drum and the screw rotate in the same direction at a certain speed differential, material from the feed tube feeding scroll continuously introducing the inner tube, accelerated into the drum, the centrifugal force field, the heavier solid phase deposition of sediment layer is formed on the drum wall. Conveying spiral deposited solid phase continuously pushed to drum cone end, the slag discharge port out of the machine. Lighter fluid liquid phase is formed inner ring, by the big end drum continuous overflow overflow outlet drum through the discharge port from the plane. The function at full speed, continuous feed, separation, washing and discharge. Has the structure compact, continuous operation, smooth operation, strong adaptability, large capacity, easy maintenance. For separating solid phase particle size greater than 0.005mm, the concentration range of 2-40% of the suspension. Widely used in chemical industry, pharmaceutical, food, environmental protection and other industries