EU Standard Fully Automatic Industrial Grade Screw Sludge Dewatering Machine

EU Standard Fully Automatic Industrial Grade Screw Sludge Dewatering Machine

Product Item : DL-301
Category： Sludge Dehydrator
Material: SS304/SS316L
Productivity: 30-50KG/H
Machinery Test Report: Provided
Certification: CE /ISO9001
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I. Sludge dehydrator introduction

Screw press sludge dewatering machine is an efficient and reliable solution to sludge water management and wastewater treatment. It utilizes a screw mechanism to transport and compress sludge, separating the water from the solid materials. The dewatered sludge cake is with reduced moisture content and volume, making it easier to handle and dispose of.

It adopts the screw extrusion principle. The rotation of the screw shaft produces a great internal pressure under the blocking action of the backpressure plate while pushing the sludge transportation so that the volume is continuously reduced, and the purpose of dewatering is finally achieved.

Discover the most efficient sludge dewatering machine designed to separate solid and liquid components of sludge. Reduce disposal costs, …

II. Sludge dehydrator description

Sludge dewatering is the process of separation of components of solid and liquid sludge to minimize the sludge disposal.

Sludge dewatering equipment is not intended to treat the sludge or liquid but; it only separates the liquid components & solid components so it will get easier & cost-effective to handle the separate phases of the disposal. Once the Final sludge has been dewatered, then the liquid is treated in ETP/STP & solid sludge is disposed.

The main purpose of the Sludge dewatering machine is to minimize handling and disposal. Sludge dewateringpress is the most cost-effective method of dewatering and hence helps to sustain the environmental objectives of the company.

III. Sludge dehydrator process

The screw press, with conical screw shaft and cylindrical screen, consists of three treatment zones: an inlet and drive zone, a three-part thickening and dewatering zone and a press zone with a pneumatic counterpressure cone. Cost-effective sludge dewatering with independent sludge treatment.

In the first part of the thickening and dewatering zone, the supernatant is quickly removed by a feed pump through a large free filter surface at low primary pressure. A pressure probe in the feed zone controls the primary pressure, thus ensuring consistent filtrate quality.

In the second part of the screen, the volume of material between the screw threads is reduced by means of a conical screw and the sludge is pressed against the inner surface of the screen, thus dewatering the sludge and decreasing the cake thickness. The screen aperture in this screen section is much smaller.

In the third part of the screen, the remaining water is pressed out of the sludge with minimum cake thickness by a pneumatic counterpressure cone at the press-out. The dewatered sludge is pushed by a screw conveyor over the pressure cone into the discharge chamber. The residence time of the sludge in the screw press as well as the filtering time can be adjusted by adjusting the speed of the screw shaft to meet individual requirements.

IV. Sludge dehydrator overall composition

The dehydrator is mainly composed of sludge premix module, concentration and dewatering module and electric control system.

The main body of the screw press dehydrator is a filter device which is superimposed by a plurality of fixed rings and floating rings, and the screw shaft runs through it. The anterior segment is concentrated and the posterior segment is dehydrated. Sludge concentration and dewatering are done in one cylinder.

The initial section of dewatering drum is the thickening Zone, where the solid-liquid separating process takes place and where the filtrate will also be discharged. The pitch of the screw and the gap between the rings decrease at the end of dewatering drum, hence increasing its internal pressure, end Plate further increases the pressure, so as to discharge dry sludge cake.

V. Sludge dehydrator complete practical operation steps

The operation of a Multi-disc Screw Press follows these basic steps:

Sludge Conditioning

Polymer is mixed with the incoming sludge to agglomerate the solid particles, forming larger flocs. This increases filtration efficiency.

Sludge Feeding

The conditioned sludge is fed into the dewatering drum.

Thickening and Dewatering

The drum consists of a screw shaft that rotates slowly. Surrounding this screw are alternating fixed and moving rings. As the screw rotates, it transports the sludge toward the outlet. During this movement: Water is drained through the narrow gaps between the discs. Pressure increases as the pitch of the screw tightens and the volume decreases, squeezing more water out of the sludge.

Cake Discharge

The dewatered sludge (now a semi-solid cake) is pushed out from the end of the screw shaft for disposal or reuse.

Sludge is first flow into the Control Tank and then flows down into the Flocculation Tank, Where polymer coagulant is added. From there, the flocculated sludge overflows into the dewatering drum where it is filtered and compressed. The entire operation sequence, including sludge feed control, polymer makeup, dosing and sludge cake discharge are controlled by the built-in timer and sensors of the PLC.

The sludge is delivered to the metering tank through the sludge pump, and then the sludge flows into the flocculation mixing tank. The excess sludge flows back to the sludge tank from the overflow pipe. Inject polymer flocculants into the flocculation mixing tank, alum floc formed after stirring, and then enters into a dewatering section of a screw press after gravity concentration (pre-treatment) section. Flocculation and dewatering are carried out in sequence, so that we have a three-stage separation process: flocculation, dewatering and concentrate recovery.

The sludge enters the dewatering machine and the sludge moves towards the sludge cake outlet under pressure from the helical screw blades. Since the pitch becomes narrower towards the outlet of the sludge cake, the sludge bears heavier pressure and begins to dewater. Water comes out from the space between fixed and moving rings while dry solids exits from the outlet.

In the actual working process, the sludge is pumped to the metering tank by an external conveying pump. The sludge after distribution further flows into the flocculation tank, reacts with the flocculant fully under the stirring of the agitator to produce stable alum flocs, and then enters the dewatering screw through the upper part of the flocculation tank. In the dehydrated body, alum flowers concentrate in the concentrated section by gravity and advance to the dehydrated section at the same time. In the process of propulsion, with the filter clearance and pitch gradually reduced, and the back pressure plate blocking effect. During the spiral rotation, the floating ring and the fixed ring will form a dislocation movement, and the water will be discharged from the gap between the floating ring and the fixed ring. It replaces the traditional filter cloth filtering method with a unique and subtle filter pattern.

VI. Sludge dehydrator model

Model	DS Capacity (kg/h) Min	DS Capacity (kg/h) Max	2g/L	5g/L	2g/L (m³/h)	5g/L (m³/h)	10g/L	20g/L	25g/L	50g/L	Spiral Diameter	Discharge Distance
DL101	3	5	1.5	0.6	1.5	0.6	0.5	0.25	0.2	0.1	Φ100×1	215
DL131	6	10	3	1.2	3	1.2	1	0.8	0.4	0.2	Φ130×1	260
DL132	12	20	6	2.4	6	2.4	2	1	0.8	0.4	Φ130×2	250
DL202	18	30	9	3.6	9	3.6	3	1.5	1.2	0.6	Φ200×2	350
DL301	30	50	15	6	15	6	5	2.5	2	1	Φ310×1	495
DL302	60	100	30	12	30	12	10	5	4	2	Φ310×2	495
DL303	90	150	45	18	45	18	15	7.5	6	3	Φ310×2	495
DL352	120	200	60	24	60	24	20	10	8	4	Φ350×2	580
DL353	180	300	60	36	60	36	30	15	12	6	Φ350×3	580
DL402	120	200	60	24	60	24	20	10	8	4	Φ410×2	585
DL403	180	300	60	36	60	36	30	15	12	6	Φ410×3	585

VII.Sludge dehydrator advantages

Waste volume reduction

The focus of sludge dewatering is to reduce weight and volume in order to minimize waste disposal costs. Therefore water removal is the primary means of volume reduction until the sludge by-products can be economically disposed of.

Reduce transportation costs

A dry, high solids content cake means lower costs. The use of dewatering equipment is an effective tool for managing sludge accumulation and can reduce transportation costs and storage costs.

Wastewater recycling

Once the sludge is dewatered and treated water is free of hazards and contaminants, it can be recycled by industry and communities for reuse. For example, steam power plants use reclaimed water to provide power services to communities.

Automation

Many people think of filter presses as labor-intensive equipment. In fact sludge dewatering filter presses can be automated with automatic cloth washers, mechanically assisted cake release devices and sophisticated control systems that allow communication with the main plant control system.

Protecting the environment

Reduces the volume of waste to a more compact and manageable size for disposal. While the dry cake is disposed of, the reuse of the filtrate reduces the need for new water sources required for treatment in municipal and industrial wastewater plants, as well as the overall amount of water required for treatment.

VIII. Sludge dehydrator key features

Simple operation and maintenance

Through a variety of induction control can realize all-weather automatic unattended operation, less routine maintenance items.

Compact design, saving space

Screw dewatering water, flocculation mixing tank, electric control cabinet press adopts trinity design, easy installation, small footprint.

Energy saving, water saving, low noise, low vibration

The core component screw shaft speed is 2~4 RPM, so the power consumption is very low. Its self-cleaning structure can prevent the filter slit clogging, can save a lot of cleaning water. There is almost no noise and vibration when rotating at low speed, ensuring a comfortable and quiet working environment.

Strong anti-sludge ability, easy to separate and not blocked

Self-cleaning structure of screw press dehydrator, not easy to cause filter seam blockage, even if the sludge can be easily handled. Kuosi also has an oil sludge treatment system to recover valuable substances from the sludge and reduce waste emissions. It should be noted that the sludge needs to be flocculated in the mixing tank and then passed through the overflow port into the dewatering water. Therefore, the sludge entering the screw press dehydrator must have certain fluidity.

IX. Sludge dehydrator applications

Dewatering screw press is widely used across various industries, with applications in fruit and vegetable juicing, plant dewatering, processing spent grains. It plays a vital role in managing agricultural waste, including grass, stalks, and coconut shells, as well as fruit and vegetable waste and food waste. Additionally, it effectively handles wastewater and slurry, excelling in managing animal manure. This versatile machine also dewaters materials like paper pulp and sludge, making it a key component in sustainable waste management practices.

Screw press dewatering machine is widely used in fruit and vegetable juicing, agricultural waste dewatering, distiller’s grains dewatering, crushing and dewatering of fruit waste and vegetable waste, decomposition of food waste, extrusion dewatering of domestic waste, solid-liquid separation of animal feces, dewatering of pulp, sawdust, and sludge.

The versatility of the Sludge Dewatering Machine allows it to handle a wide variety of sludge types.

It is suitable for:

Municipal Wastewater Treatment Plants

Effluent Treatment Plants (ETP)

Sewage Treatment Plants (STP)

Food & Beverage Industry

Paper & Pulp Industry

Textile & Dyeing Industry

Chemical & Pharmaceutical Plants

Tannery & Leather Processing Units

Whether dealing with oily sludge, organic sludge, or fibrous sludge, it can adapt and deliver consistent performance.