MAK Water’s Dewatering Screw Press (DSP) is designed for efficient thickening and dewatering of liquid sludges that emanate from municipal and industrial wastewater treatment processes. Typical applications for wastewater treatment plants include dewatering of thickened or unthickened waste activated sludge (WAS), digested sludge from aerobic or anaerobic processes, and dissolved air flotation (DAF) sludges.
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Our Dewatering Screw Press is also suitable for dewatering of liquid sludges from a wide range of industries, including food & beverage, chemical, manufacturing, infrastructure development and resource industries.
For municipal WWTP sludge applications, our sludge Dewatering Screw Press typically produces dewatered sludge cake of 15% to 20% dry solids content. For industrial projects, depending on the specific application, cake of >20% dry solids content is possible.
The ability to dewater WAS directly from the activated sludge process, eliminates the need for an intermediate thickening process, thus offering significant savings in capital and operating costs.
Liquid sludge is pumped to the Dewatering Screw Press via an external feed pump. The sludge enters the Inlet Chamber, which is fitted with an overflow. Any overflow is directed back to the sludge source tank or process. The Inlet Chamber serves to optimise flow to the other parts of the machine.
Liquid sludge is discharged from the Inlet Chamber via a V-notch weir into the Flocculation Chamber. Polymer is added into the Flocculation Chamber to aggregate/flocculate sludge solids into flocs. Flocculation occurs where the sludge and polymer are mixed slowly by a vertical paddle mixer. The sludge flocs then flow via an overflow from the Flocculation Chamber into the screw, which is the basic mechanism of the dewatering press.
A screw with a variable pitch helix operates within a cylinder of fixed and moving rings that make up the dewatering drum. The fixed rings form a static structure whereas the moving rings ensure continuous self-cleaning while the screw is in motion. The gap between the fixed and moving rings varies from 0.5 to 0.1 mm.
However, when the screw is in operation, the size of the gaps changes continuously, thus giving a smooth dewatering process. The filtrate that results from the dewatering process as the flocculated sludge is compressed, flows through these gaps into a collection tray located under the machine. The filtrate can gravitate from this tray to the head of works or any other suitable location.
An adjustable pressure plate is mounted at the end of the screw. This allows the already dewatered sludge to be compressed even more to increase the dewatering efficiency, thus producing dewatered sludge cake. The dewatered cake can be discharged from the sludge Dewatering Screw Press into a skip directly, or discharged via a conveyor into a skip for collection & disposal of the dewatered cake.
The Dewatering Screw Press machine is made of 304 stainless steel. The rings are made of 316 stainless steel, and the screw is made of 316L stainless steel with special tungsten surface treatment. This ensures abrasion resistance, sufficient hardness and resistance to wear and tear, and provides the necessary resistance to corrosion for materials which come into contact with aggressive sludges.
The Dewatering Screw Press is designed to run in AUTO mode, thus requiring little operator attendance. In AUTO mode the operator can check the status of the equipment and change operational set-points via the HMI touch screen located in the Control Panel.
The Screw motor is fitted with a Variable Speed Drive (VSD) which makes it possible to accelerate or slow down the screw rotational speed for optimal dewatering. The Mixer motor is also fitted with a VSD to allow the operator to optimise flocculation for the best possible dewatering results.
The Dewatering Screw Press can also be operated in full MANUAL mode, where each component can be manually turned on/off via the HMI touch screen.
Product Description
A screw press is a machine that uses a rotating screw to press sludge against a permeable filter to drain water and produce a dry sludge cake.
The screw press is composed of a screw stacking body, a driving device, a filtrate tank, a flocculation tank, a frame, etc. The stacked screw body is composed of a fixed ring, a movable ring, a screw shaft, a screw, a gasket, and a connecting plate. The fixed rings and the movable rings are stacked on each other, and the screw shaft runs through it to form a filter body. It can be used in biochemical pharmaceuticals, petroleum refining, power plant wastewater, municipal wastewater, brewing wastewater, coal washing wastewater, chemical wastewater, printing, and dyeing paper making, and food industries.
Working principle
1. Concentration: When the helical push shaft rotates, the multiple fixed and active laminations set on the push shaft move relatively, and under the action of gravity, water is filtered out from the gaps between the relatively moving laminations to achieve rapid concentration.
2. Dehydration: The concentrated sludge moves forward continuously with the rotation of the screw shaft; along the direction of the mud cake outlet, the pitch of the screw shaft gradually decreases, the gap between the rings also gradually decreases, and the volume of the screw cavity Continuous shrinkage; under the action of the back pressure plate, the internal pressure gradually increases, driven by the continuous operation of the screw drive shaft, the water in the sludge is squeezed out, the solid content of the filter cake continues to increase, and the continuous dehydration of the sludge is realized.
3. Self-cleaning: The rotation of the screw shaft drives the moving ring to rotate continuously. The equipment relies on the movement between the fixed ring and the moving ring to realize a continuous self-cleaning process, avoiding the clogging problem of the traditional dehydrator.
Product Parameters
Model
Material
D.S.Capacity
Sludge Capacity(10000mg/L)
Dimension (L x W x H)
Weight (kg)
Running Weight
HDL131
SS 304
~ 6 -- 10 kgds/h
~1.0
2000x660x1040 mm
190
300
HDL201
~ 9 -- 20 kgds/h
~1.5
2500x800x1450 mm
320
550
HDL202
~ 18 -- 30 kgds/h
~3.0
2600x950x1450 mm
470
680
HDL203
~ 27 -- 45 kgds/h
~4.5
2700x1100x1450 mm
620
920
HDL301
~ 30 -- 60 kgds/h
~6.0
3200x800x1700 mm
600
1100
HDL302
~ 60 -- 100 kgds/h
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~12
3400x1250x1700 mm
1350
2050
HDL303
~ 90 -- 150 kgds/h
~18
3600x1600x1700 mm
1820
2580
HDL304
~ 120 -- 200 kgds/h
~24
3600x2050x1700 mm
2400
3520
HDL401
~ 100 -- 150 kgds/h
~15
4000x1000x2200 mm
1100
2500
HDL402
~ 185 -- 350 kgds/h
~30
4050x1420x2200 mm
1900
3600
HDL403
~ 400 -- 600 kgds/h
~45
4050x1800x2200 mm
3050
5250
HDL404
~ 480 -- 800 kgds/h
~61
4400x2650x2350 mm
5150
7200
Our Advantages
Various types of products, exquisite design, small footprint.
Compared with the traditional belt type, plate frame, and centrifugal dewatering machines, the screw press adopts the three-in-one design of the dehydration body, the flocculation mixing tank, and the electric control device, which is portable to install and occupies a small space, greatly reducing the design and construction cost. At the same time, there is no need to re-construct the replacement project due to the exquisite design of the stacked screws.
Simple operation and maintenance.
The 24-hour fully automatic unmanned operation can be realized through various methods such as PLC remote control, reducing operator's employment and maintenance costs. At the same time, due to its exquisite design, it is easy to learn and operate.
Water saving, power saving, low noise.
The screw press has a self-cleaning function and does not require a lot of cleaning water for clogging. Compared with other dehydrators, the flushing water consumption of the screw press is one percent of that of the belt dehydrator. The rotation speed of the screw shaft is 2-5 revolutions per minute, and the power consumption is low, which is economical and applicable. At the same time, due to the low speed and intermittent flushing, the equipment runs without noise.
Application
Municipal and sewage treatment: Most of the sewage from municipal sewage plants comes from urban domestic sewage, in which the content of organic sludge is high. The screw press dehydrates well, has low energy consumption, and can run unattended all day, so the screw press is suitable for municipal sewage factories.
Printing and dyeing enterprises: The pollutants in the sewage of printing and dyeing factories are complex. The water quality of this kind of sewage changes greatly, and the content of organic sludge is also relatively high. However, the screw press is used to deal with this kind of dye and fiber impurities. The dynamic and static ring pieces for the screw press Instead of the traditional filter cloth, there will be no clogging.
Papermaking and tobacco enterprises: The sewage produced by papermaking and tobacco has a large proportion of plant fibers and detergent additives. Among them, the water of pulp and cut tobacco is relatively alkaline, which is easy to corrode the machine and accumulate mud. With self-cleaning function, no residue left, and longer service life.
Beer and fruit juice enterprises: Wastewater mainly contains fruit peels, additives, fibers, carbohydrates, and alcohol. Due to the high content of organic matter, it is easy to become rancid and fermented. The screw press is relatively easy to treat juice beer sewage. The machine is made of 304 stainless steel, which is wear-resistant and anti-corrosion and is more suitable for juice brewery applications.
Starch and pharmaceutical companies: The wastewater produced in the process of starch and pharmaceuticals contains a lot of small molecule organic matter and is easily soluble in water. The screw press realizes the overall completion of flocculation and dehydration, ideal mud output, and relatively clear discharged water.
Filter Cakes
Detailed Photos
Production Workshop
Warehouse
Customer Site
Packaging & Shipping
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