screw press sludge dewatering system
Screw press Sludge Dewatering Equipment is our main product. It is a new kind of volute multi-disc hydraulic solid-liquid separation machine in wastewater treatment , adopting multi-disk structure. Low rotation speed, energy-saving, non-clogging design, easy to operate, all these advantages make this dewatering press more and more popular around the world. And it can work 24h automatically, it saves labor cost. Compact and smart design saves the construction cost. Easy to maintain saves your maintenance cost.
Screw press can be used for sludge thickening and dewatering ,it is is usually used for sludge treatment after biological process and thickening prior to storage, digestion and further dewatering. In WWTP, sludge concentration is about 0.2%-2%. After thickening, the solid content reaches 5% to 9%. Thus stable thickened sludge is provided for further dewatering equipment such as frame press and other machines. Also the dewatering efficiency and capacity are improved.
Work principle :
1. The main body of the dehydrator is composed of a fixed ring and a movable ring screw on top of each other, with a screw l shaft running through it to form a filtration device. The front section is the concentration section, and the rear section is the dehydration section. 2. The filter gap formed between the fixed ring and the movable ring, as well as the pitch of the spiral shaft, gradually decreases from the concentration section to the dehydration section. The rotation of the 3 spiral shafts not only pushes the sludge from the concentration section to the dehydration section, but also continuously drives the traveling ring to clean the filter gap and prevent blockage. After gravity concentration in the concentration section, the sludge is transported to the dehydration section. As it advances, it gradually decreases with the filter gap and pitch, and under the blocking effect of the back pressure plate, generates great internal pressure, continuously reducing its volume to achieve full dehydration
As screw press starts running, sludge flows into the filter cylinder and moves forward to sludge cake outlet under the thrust from screwshaft. The whole filter cylinder is composed of fixed rings, moving rings ans shaft. The first two sections are thickening zone, last two are dewatering zone, The space between screw blades gets more and more narrower, which means the inner pressure gradually gets bigger.. Under this pressure, liquid is squeezed out from the sludge and leaks from the small gaps between rings. And the left dry solid is pushed to the sludge cake outlet.
Technical process Diagram
Application occasions and advantages
It is suitable for municipal sewage, petroleum refining, leather brewing, printing and dyeing, animal husbandry, coal chemical beneficiation, biochemical pharmaceuticals, steel pickling, chemical sugar making, food processing, etc. 1. Low operating cost: equivalent to less than 40% of belt filter press, equivalent to less than 20% of centrifugal dehydrator. 2. Power saving: less than 5% of centrifuge 3. Water saving: less than 0.1 of belt filter press 4. Provide medicine: save medicine by 60% on average. 5. Small size: investment in dewatering machine room saves more than 60% of mud. 6. No clogging: the negatives of greasy fibre sludge.
The company's production and manufacture of the removal of snail mud dewatering machine, has now formed 16 types of specifications and models to adapt to different sludge treatment and different needs of customers. Sludge dewatering machine integrates automatic control cabinet, sludge thickening dewatering body and collecting liquid in body. It can realize high-efficiency flocculation under fully automatic operation sacrificial parts, and continuously complete sludge thickening and jade pressing dewatering.
It can be used for sludge in municipal sewage, food, beverage, chemical industry, leather, welding materials, papermaking, printing and dyeing, pharmaceutical, petroleum, coal and other industries.
¨The concentration can be adjusted (2000 ~ 50000mg / L) without the construction of concentration tank and storage tank, so as to reduce the construction cost, reduce the release of phosphorus and the generation of anaerobic odor.
High degree of automation, high separation efficiency, low power consumption, no noise and corrosion resistance.
¨Compact body design, concentration and dehydration integration, with electric control cabinet, sludge flocculation mixing tank and other auxiliary devices, strong compatibility.
Self cleaning function, low-speed spiral extrusion technology, low power consumption.
The frequency of daily maintenance is low, the replacement parts are few, the replacement operation is simple and time-consuming
¨Optional material: stainless steel SS304 or SS316L.
When the equipment is running, the sludge is pushed into the filter barrel from the inlet to the discharge outlet by the spiral spindle. As the pitch between the spiral spindles is gradually reduced, the pressure on the sludge increases and dewatering begins under the action of pressure difference. Water flows out from the filter gap between the fixed plate and the movable plate. At the same time, the equipment relies on the self-cleaning function between the fixed plate and the movable plate. Clean the filter clearance to prevent clogging. After sufficient dehydration, mud cake is discharged from the discharge outlet under the push of the screw shaft.
Main features 1.Simple process flow, high efficiency and energy saving of sludge dewatering, low system investment. 2.The system can be programmed to make the operation convenient and accurate. 3.Unique flocculant makes sludge dewatering easier. 4.Equitable and accurate dispensing, saving operation cost.
| number |
Equipment model |
DS standard capacity(kg/h) |
| Low concentration |
High concentration |
| 1 |
FLSDPW131 |
5 |
10 |
| 2 |
FLSDPW132 |
10 |
20 |
| 3 |
FLSDPW251 |
15 |
30 |
| 4 |
FLSDPW252 |
30 |
60 |
| 5 |
FLSDPW301 |
30 |
60 |
| 6 |
FLSDPW302 |
60 |
120 |
| 7 |
FLSDPW303 |
90 |
180 |
| 8 |
FLSDPW304 |
120 |
240 |
| 9 |
FLSDPW351 |
50 |
100 |
| 10 |
FLSDPW352 |
100 |
200 |
| 11 |
FLSDPW353 |
150 |
300 |
| 12 |
FLSDPW354 |
200 |
400 |
| 13 |
FLSDPW401 |
80 |
160 |
| 14 |
FLSDPW402 |
160 |
320 |
| 15 |
FLSDPW403 |
240 |
480 |
| 16 |
FLSDPW404 |
320 |
640 |
Audited Supplier 
1. The main body of the dehydrator is composed of a fixed ring and a movable ring screw on top of each other, with a screw l shaft running through it to form a filtration device. The front section is the concentration section, and the rear section is the dehydration section. 2. The filter gap formed between the fixed ring and the movable ring, as well as the pitch of the spiral shaft, gradually decreases from the concentration section to the dehydration section. The rotation of the 3 spiral shafts not only pushes the sludge from the concentration section to the dehydration section, but also continuously drives the traveling ring to clean the filter gap and prevent blockage. After gravity concentration in the concentration section, the sludge is transported to the dehydration section. As it advances, it gradually decreases with the filter gap and pitch, and under the blocking effect of the back pressure plate, generates great internal pressure, continuously reducing its volume to achieve full dehydration
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