1. Centrifugal dewatering machine
The decanter centrifugal dewatering machine is mainly composed of a rotating drum and a screw ejector with a hollow rotating shaft. After the sludge is sent into the rotating cylinder by the hollow rotating shaft, it is immediately smashed by the centrifugal force generated by the high-speed rotation which is several thousand times larger than the gravity. In the drum cavity. The specific gravity of the sludge particles is large, so the centrifugal force generated is also large, and the crucible is attached to the inner wall of the rotating hub to form a solid layer; the water density is small, the centrifugal force is also small, and only the liquid layer is generated inside the solid layer. The sludge of the solid layer is transported to the cone end of the drum under the slow push of the screw ejector, and is continuously discharged through the drum venting port, and the liquid is discharged from the water outlet to the outside of the drum, and is discharged after being discharged. machine.
The characteristics of the horizontal screw centrifugal dewatering machine: small footprint, simple operation, continuous operation, high degree of automation, less pollution to the working environment, less labor intensity of the operator; horizontal decanter centrifuge is affected by the fluctuation of sludge load Small, due to the large centrifugal force, the sludge pretreatment (flocculation) is not required. Therefore, a smaller molecular weight flocculant can be used with a small amount and a lower operating cost.
The dewatering technology of centrifugal dewatering machine has made great progress in recent years, especially some advanced technologies from abroad, such as the spiral centrifugal dewatering machine produced by Alfa Layal Company of Sweden, FlOwttwey Company of Germany, Sharples Company of USA, Shichuan Broadcasting Company of Japan, etc. The mud cake has a solid content of more than 30%, continuous operation, stable and reliable, the slurry can be concentrated without concentration, and the automation is high; and the operation is carried out in a completely enclosed environment, and there is no sludge and sewage around the dehydrator. Existence, no odor, can greatly improve the working environment of the operating personnel, and thus is favored by the industry, has great market potential.
2. Belt filter press dehydrator
The belt type filter press dewatering machine is composed of a sludge layer sandwiched by two upper and lower tensioned filter belts, and passes through a series of regularly arranged roller cylinders in an S shape, and relies on the tension of the filter belt itself to form a squeeze layer on the sludge layer. Shear force, continuous operation, squeeze out the water in the sludge layer to achieve sludge dewatering.
The belt type filter press dewatering machine is greatly affected by the fluctuation of sludge load. When the sludge load is large, the sludge will overflow from both sides of the filter belt and pollute the site. After the filter belt is turned into the lower part, a large amount of water recoil is required. The sludge adhered to the filter belt does not block the pores of the filter belt, because the belt type filter press dewatering machine is open-type work, which has a large pollution to the working environment and consumes a large amount of water; the belt type filter press dewatering machine The operation is cumbersome. During the operation process, the filter belt often runs off and the filter belt is worn out. It is necessary to adjust and replace the new filter belt in time. Therefore, the management control is relatively complicated, and the quality of the operation operator is high; the filter press dehydrator is The sludge pretreatment (flocculation) is required to be high, and a high molecular weight flocculant is required and the amount is large, so the price is high and the cost is high.
3. Plate and frame filter press dewatering machine
The plate and frame filter press is extruded through the plate frame, so that the water in the sludge is discharged through the filter cloth to achieve the purpose of dehydration. It is mainly composed of a concave type filter plate, a frame, an automatic-pneumatic closing system side plate suspension system, a filter plate vibration system, an air compression device, a filter cloth high-pressure flushing device, and a body side photoelectric protection device. When selecting equipment, you should consider the following aspects:
(1) Requirements for the solid content of mud cake. Compared with other types of dewatering machines, the general plate and frame filter press has a high solid content of up to 65 percent. If it is reduced from the land occupation of the sludge, the plate and frame filter press It should be ^ plan.
(2) The material of the filter plate and filter cloth. Resistant to corrosion, with a certain tensile and compressive strength.
(3) How the filter plate moves. The requirements can be fully or semi-automatically completed by hydraulic-pneumatic devices to reduce the labor intensity of the operator.
(4) The operator has high labor intensity, large floor space, large site pollution, large loss of filter cloth and filter plate, and low production efficiency.
