What are the Types of Sludge Dehydrators?
According to the current market share, we can divide the sludge dehydrators into belt-type sludge dehydrators, centrifugal sludge dehydrators, screw-type sludge dehydrators, etc. Let's talk about it in detail.
Belt-type sludge dehydrator
Belt-type sludge filter press is a very important piece of equipment in the sludge treatment industry. It has high sludge pressure efficiency, can concentrate and dewater sludge, and can handle a large amount of sludge. Since entering the market, it has been deeply trusted by the industry!
Structural composition:
It is generally composed of the main machine (filter belt, multi-channel pressure roller, motor, and air compression pump), dosing tank, dosing pump, sedimentation tank, sedimentation tank, clean water tank, mud pump, and pipeline.
Working principle:
Working principle The dewatering process of belt press filters can be divided into four important stages: pretreatment, gravity dewatering, wedge area pre-pressing dewatering, and press dewatering.
Workflow:
The sewage enters the sedimentation tank through the mud pump, and at the same time, the dosing pump injects chemicals into the sedimentation tank. The sewage settles quickly under the action of the chemicals. The mud pump pumps the settled mud to the sludge dehydrator. First, gravity dewatering is carried out on the filter belt and then enters the wedge area to stamp the mud. Under the action of the chemicals, the mud quickly coagulates, removes excess water, and dehydrates again. Finally, under the inclusion of two filter belts, it enters into the dehydration roll composed of multiple "S" types for deep dehydration.
Centrifugal sludge dehydrator
The centrifugal sludge dewatering machine is a new generation of advanced sludge dewatering equipment after the plate and frame filter press and belt filter press, which applies to all types of sludge dewatering.
Advantage:
(1) The horizontal spiral centrifuge uses the centrifugal sedimentation principle to separate the solid from the liquid. Since there is no filter screen, it will not cause blockage.
(2) When the feed concentration of the centrifuge changes during dehydration, the slip and torque of the drum and screw will be automatically tracked and adjusted, and no special person can be assigned for operation.
(3) In the centrifuge, small sludge can also be separated from water, so the dosage of the flocculant is small. Generally, the dosage of mixed sludge for dehydration is 1.5kg/t [dry sludge], the recovery rate of sludge is above 95%, and the moisture content of sludge cake after dehydration is about 70% - 85%.
(4) Centrifuge takes up small space and is easy to install and debug. The supporting equipment is only a dosing and feeding/discharging conveyor. The whole machine is fully sealed for operation and the workshop environment is good
(5) The vulnerable parts of the centrifuge are the bearings and seals. The maintenance cycle of the discharge screw pusher is generally more than three years. Imported famous bearings and seals can ensure that the equipment operates for a longer time with high intensity. Normal maintenance can greatly extend the maintenance cycle.
Stacked screw sludge dehydrator
The spiral stacked sludge dehydrator, referred to as spiral stacked sludge dehydrator, is currently the most widely used sludge dewatering product with the highest market share. It is a water treatment system widely used in municipal sewage treatment projects and petrochemical, light industry, chemical fiber, paper making, pharmaceutical, leather, and other industrial industries. The actual operation proves that spiral sludge dewatering can create considerable economic and social benefits for customers.
Structure:
The spiral sludge dehydrator belongs to the spiral sludge thickening and dewatering system, which can effectively reduce the capital construction cost and reduce the pressure of the enterprise. The spiral sludge dehydrator skillfully uses the automatic renewal filter cake filtration technology to replace the traditional filter screen filtration. The self-renewal filter cake filtration technology ensures the continuous and stable mud-water separation effect of the dehydrator. Through the strong squeezing force generated by the change of screw diameter and screw pitch, and the small gap between the movable ring and the fixed ring, the sludge is squeezed and dehydrated. It is a new type of solid-liquid separation equipment.
Working principle:
Generally, the screw stacker is connected to the dosing system. After the pam agent is pumped into the mixing tank, it is fully mixed and mixed with the slurry. It is transported to the upper part of the main body of the screw stacker through the screw extrusion system. In the sludge thickening section, it is concentrated, squeezed in the dehydration section, and the sludge is discharged.