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Is limited space blocking your biological sludge dewatering plans? Our Compact Screw Press is designed for tight environments, like the upper floors of municipal wastewater plants or small bioreactors in industrial parks. The vertical screw design takes up just 0.72m² of floor space—60% less than horizontal presses—while delivering consistent dewatering for sludge from activated sludge processes, trickling filters, and rotating biological contactors.
| Quantity: | |
|---|---|
YDL353
BOEEP
YDL
| Parameter design | |
| Type：YDL353 | Protection Level：IP55 F |
| Dimension：L4700×W1950×H2130（mm） | Power Supply：380V/3/50Hz or customize |
| Inlet sludge concentration：2500~20000mg/L | Outlet sludge moisture content：75-85% |
| Capacity：240-360kgds/h | Polymer feeding rate：DS 0.2～1% |
| Power：4.8kw | Flush water：180L/h |
| Water supply pressure：≥0.2MPa | Equipment weight：3500kg |
| Screw body | Pre thickening mixing system |
| Diameter × Length：Φ350×2800(mm) | Dimension：L1000×W1000×H1400(mm) |
| Quantity：3pcs | Volume：1400L |
| Material：Plate: SUS304/ Screw Shaft: SUS304 | Material：SS304 |
| Motor Power：1.1×3kW | Motor power：1.5kw |
| Electrical Cabinet | |
| 1. Frequency converting controls dewatering body; | |
| 2. Controls polymer mixing device; | |
| 3. Realize the switch of automatic operation and manual operation. | |
Vertical layout: 1.2m height x 0.6m width x 0.5m depth—fits through standard 0.8m doorways, making it ideal for retrofitting into existing buildings without structural modifications.
Lightweight construction: 300kg (stainless steel version), compared to 1.5 tons for equivalent horizontal presses—easily moved with a pallet jack or elevator.
Gentle screw rotation (10 RPM, torque 50 Nm) preserves 90%+ of microbial viability, crucial for sludge reused in anaerobic digesters or as seed sludge for new bioreactors.
Adjustable screen mesh (0.1mm for fine flocs, 0.5mm for coarse solids) via quick-release clamps—switch between municipal and industrial sludge types in 10 minutes.
Produces cake with 25-30% solids content, reducing disposal volume by 50%—tested on activated sludge from Chicago’s Stickney Water Reclamation Plant.
Self-cleaning function: Every 2 hours, the screw reverses for 20 seconds while nozzles spray 30psi water, preventing biofilm buildup and associated odors (common in humid environments).
Municipal Wastewater Plants: Dewaters excess sludge from aeration tanks (0.5-1% solids input) and secondary clarifiers (1-3% solids), supporting plants treating 10,000-50,000 m³/day.
Industrial Bioreactors: Handles sludge from food processing (high BOD), pharmaceutical fermentation (low toxicity), and biofuel production (high volatile solids).
Decentralized Treatment: Ideal for resort sewage systems (e.g., Maldives resorts with limited space), university campuses, and rural communities with 500-5,000 residents.
Space Saver: The #1 choice for urban plants like New York City’s Wards Island Plant, where floor space costs $500+/ft²—install 3 units in the space of 1 traditional press.
Low Odor Operation: Sealed casing with activated carbon filter (optional) reduces hydrogen sulfide emissions by 80%, keeping neighboring areas odor-free.
Long Lifespan: 316 stainless steel screw and PE-coated screen (UV-resistant) ensure 10+ years of service, even in corrosive biological treatment environments—backed by our 5-year warranty (industry-leading for compact systems).
Main Structure
BOEEP pre-thickening screw press dewatering unit is composed of pre thickening mixing system, screw body, driving device, filtrate receiver and frame.
 1-Pre Thickening Mixing system The pre concentration system is composed of the pre concentration system (Figure 1), the mixing blades and the concentrated box. The mixing system is used to make the sludge and polymer fully mixed in the thickening tank, the sludge can be flocculated to be gathered together, meanwhile, some of the water will be filtrated in the thickening system due to the gravity function, and the formed flocs will be transported to the screw body to press and dewater. There are sludge inlet, overflow port, polymer feed port and vent nozzle in mixing tank. Also there is the level adjusting device to adjust the sludge inleting amount. |
2-Screw body
Screw body is composed of fixed rings, moveable rings, screw shaft, screw, gasket and lots of junction plate. The front part of the main body is the thickening part, and the ending part is dewatering part. So the thickening and dewatering of the sludge can be finished in one canister. Sludge will be transported to the dewatering department after being thickened in the thickening department. In the advancing process, great pressure has been produced because of the gradually decreasing filter spacing and screw distance, and the back platen clogging. Then the volume decreases continuously, and the purpose of fully dewatering will be achieved.
3-Driving device
Drive device is the power source of the equipment, and the performance of drive device can affect the equipment performance directly. For this reason, the motor our company adopts has a superior performance with IP55 and F level. Frequency conversion starting and speed control mode can suit for different application conditions to avoid the impact of the load.
4-Filtrate receiver
Filtrate receiver, welded by plate, is used to collect filtrate pressed by screw body. Filtrate receiver is welded to the side plates directly, and there are flanges on the side to connect the external devices.
Working Principle
When the pre-thickening screw press dewatering unit operates, sludge will be transported to the mixing tank by sludge feed pump, at the same time, the solid polymer has been added to the mixing tank quantitatively by the polymer feed pump. Mixing motor drives the whole mixing system to make the sludge and polymer fully mixed and then flocs will be produced. When the liquid level arrives at the superior level of the liquid level sensor, the liquid level sensor gets the signal to make the motor of screw body operates, then begins to press the sludge which has flows into the screw body. Sludge will be transported to the outlet step by step by the effect of screw shaft; filtrate will flow out by the space of fixed annular plates and moveable annular plates.
Model Choice
| Model | DS Sludge treating capacity | Sludge flow treating capacity | |||
| 2500mg/L | 5000mg/L | 10000mg/L | 20000mg/L | ||
| YDL301 | 40-70 kg/h | ~16 m³/h | ~10m³/h | ~7 m³/h | ~3.5m³/h |
| YDL302 | 80-140 kg/h | ~32m³/h | ~20m³/h | ~14 m³/h | ~7 m³/h |
| YDL303 | 120-210 kg/h | ~48m³/h | ~30 m³/h | ~21 m³/h | ~10.5m³/h |
| YDL304 | 160-280 kg/h | ~64 m³/h | ~40 m³/h | ~28 m³/h | ~14 m³/h |
| YDL351 | 80-120 kg/h | ~32m³/h | ~16m³/h | ~12 m³/h | ~6m³/h |
| YDL352 | 160-240 kg/h | ~64m³/h | ~32m³/h | ~24 m³/h | ~12 m³/h |
| YDL353 | 240-360 kg/h | ~96 m³/h | ~48 m³/h | ~36 m³/h | ~18 m³/h |
| YDL354 | 320-480 kg/h | ~128m³/h | ~64m³/h | ~48m³/h | ~24 m³/h |
| YDL401 | 100-160 kg/h | ~40m³/h | ~26m³/h | ~16m³/h | ~8 m³/h |
| YDL402 | 200-320 kg/h | ~80m³/h | ~52 m³/h | ~32 m³/h | ~16 m³/h |
| YDL403 | 300-480 kg/h | ~120m³/h | ~78m³/h | ~48m³/h | ~24 m³/h |
| YDL404 | 400-640 kg/h | ~160 m³/h | ~104 m³/h | ~64 m³/h | ~32 m³/h |
Technical Specification
| Model | Screw specification | Distance from mud cake outlet to the ground (mm) | Overall dimensions(mm) | N.W | Operating weight | ||
| length(L) | width(W) | height(H) | |||||
| YDL301 | φ300×1 | 500 | 4000 | 1580 | 1900 | 1100kg | 1850kg |
| YDL302 | φ300×2 | 500 | 4000 | 1580 | 1900 | 1550kg | 2450kg |
| YDL303 | φ300×3 | 500 | 4000 | 1610 | 1900 | 2100kg | 3250kg |
| YDL304 | φ300×4 | 500 | 4185 | 2050 | 1900 | 2800kg | 4100kg |
| YDL351 | φ350×1 | 680 | 4340 | 1160 | 2300 | 1350kg | 2250kg |
| YDL352 | φ350×2 | 680 | 4500 | 1550 | 2300 | 2350kg | 3500kg |
| YDL353 | φ350×3 | 680 | 4800 | 2100 | 2300 | 3500kg | 5000kg |
| YDL354 | φ350×4 | 680 | 5100 | 2650 | 2300 | 4500kg | 6100kg |
| YDL401 | φ400×1 | 875 | 5150 | 1400 | 2560 | 3100kg | 5200kg |
| YDL402 | φ400×2 | 875 | 5150 | 1880 | 2560 | 4300kg | 6900kg |
| YDL403 | φ400×3 | 875 | 5350 | 2525 | 2560 | 6000kg | 9100kg |
| YDL404 | φ400×4 | 875 | 5500 | 3105 | 2560 | 7500kg | 12900kg |
| Model | Motor power | Washing water pressure | Clean water qty(L/h) | Maintenance frequency | Wearing parts replacing cycle (years) | ||||
| Screw shaft | Mixer | Total | Screw axis | Active ring | Drive shaft | ||||
| YDL301 | 0.75 | 1.1 | 1.85 | 0.1~0.2Mpa (Without high pressure flushing equipment) | 40 | 5 Minutes per hour | 10 | 5 | 2 |
| YDL302 | 1.5 | 1.1 | 2.6 | 80 | 10 | 5 | 2 | ||
| YDL303 | 2.25 | 1.1 | 3.35 | 120 | 10 | 5 | 2 | ||
| YDL304 | 3 | 1.1 | 4.1 | 160 | 10 | 5 | 2 | ||
| YDL351 | 1.1 | 1.1 | 2.2 | 60 | 10 | 5 | 2 | ||
| YDL352 | 2.2 | 1.1 | 3.3 | 120 | 10 | 5 | 2 | ||
| YDL353 | 3.3 | 1.5 | 4.8 | 180 | 10 | 5 | 2 | ||
| YDL354 | 4.4 | 1.1+1.1 | 6.6 | 240 | 10 | 5 | 2 | ||
| YDL401 | 1.5 | 1.1 | 2.6 | 80 | 10 | 5 | 2 | ||
| YDL402 | 3 | 1.5 | 4.5 | 160 | 10 | 5 | 2 | ||
| YDL403 | 4.5 | 1.1+1.1 | 6.7 | 240 | 10 | 5 | 2 | ||
| YDL404 | 6 | 1.1+1.1 | 8.2 | 320 | 10 | 5 | 2 | ||
Product Details
Object Site
| Parameter design | |
| Type：YDL353 | Protection Level：IP55 F |
| Dimension：L4700×W1950×H2130（mm） | Power Supply：380V/3/50Hz or customize |
| Inlet sludge concentration：2500~20000mg/L | Outlet sludge moisture content：75-85% |
| Capacity：240-360kgds/h | Polymer feeding rate：DS 0.2～1% |
| Power：4.8kw | Flush water：180L/h |
| Water supply pressure：≥0.2MPa | Equipment weight：3500kg |
| Screw body | Pre thickening mixing system |
| Diameter × Length：Φ350×2800(mm) | Dimension：L1000×W1000×H1400(mm) |
| Quantity：3pcs | Volume：1400L |
| Material：Plate: SUS304/ Screw Shaft: SUS304 | Material：SS304 |
| Motor Power：1.1×3kW | Motor power：1.5kw |
| Electrical Cabinet | |
| 1. Frequency converting controls dewatering body; | |
| 2. Controls polymer mixing device; | |
| 3. Realize the switch of automatic operation and manual operation. | |
Vertical layout: 1.2m height x 0.6m width x 0.5m depth—fits through standard 0.8m doorways, making it ideal for retrofitting into existing buildings without structural modifications.
Lightweight construction: 300kg (stainless steel version), compared to 1.5 tons for equivalent horizontal presses—easily moved with a pallet jack or elevator.
Gentle screw rotation (10 RPM, torque 50 Nm) preserves 90%+ of microbial viability, crucial for sludge reused in anaerobic digesters or as seed sludge for new bioreactors.
Adjustable screen mesh (0.1mm for fine flocs, 0.5mm for coarse solids) via quick-release clamps—switch between municipal and industrial sludge types in 10 minutes.
Produces cake with 25-30% solids content, reducing disposal volume by 50%—tested on activated sludge from Chicago’s Stickney Water Reclamation Plant.
Self-cleaning function: Every 2 hours, the screw reverses for 20 seconds while nozzles spray 30psi water, preventing biofilm buildup and associated odors (common in humid environments).
Municipal Wastewater Plants: Dewaters excess sludge from aeration tanks (0.5-1% solids input) and secondary clarifiers (1-3% solids), supporting plants treating 10,000-50,000 m³/day.
Industrial Bioreactors: Handles sludge from food processing (high BOD), pharmaceutical fermentation (low toxicity), and biofuel production (high volatile solids).
Decentralized Treatment: Ideal for resort sewage systems (e.g., Maldives resorts with limited space), university campuses, and rural communities with 500-5,000 residents.
Space Saver: The #1 choice for urban plants like New York City’s Wards Island Plant, where floor space costs $500+/ft²—install 3 units in the space of 1 traditional press.
Low Odor Operation: Sealed casing with activated carbon filter (optional) reduces hydrogen sulfide emissions by 80%, keeping neighboring areas odor-free.
Long Lifespan: 316 stainless steel screw and PE-coated screen (UV-resistant) ensure 10+ years of service, even in corrosive biological treatment environments—backed by our 5-year warranty (industry-leading for compact systems).
Main Structure
BOEEP pre-thickening screw press dewatering unit is composed of pre thickening mixing system, screw body, driving device, filtrate receiver and frame.
1-Pre Thickening Mixing system The pre concentration system is composed of the pre concentration system (Figure 1), the mixing blades and the concentrated box. The mixing system is used to make the sludge and polymer fully mixed in the thickening tank, the sludge can be flocculated to be gathered together, meanwhile, some of the water will be filtrated in the thickening system due to the gravity function, and the formed flocs will be transported to the screw body to press and dewater. There are sludge inlet, overflow port, polymer feed port and vent nozzle in mixing tank. Also there is the level adjusting device to adjust the sludge inleting amount. |
2-Screw body
Screw body is composed of fixed rings, moveable rings, screw shaft, screw, gasket and lots of junction plate. The front part of the main body is the thickening part, and the ending part is dewatering part. So the thickening and dewatering of the sludge can be finished in one canister. Sludge will be transported to the dewatering department after being thickened in the thickening department. In the advancing process, great pressure has been produced because of the gradually decreasing filter spacing and screw distance, and the back platen clogging. Then the volume decreases continuously, and the purpose of fully dewatering will be achieved.
3-Driving device
Drive device is the power source of the equipment, and the performance of drive device can affect the equipment performance directly. For this reason, the motor our company adopts has a superior performance with IP55 and F level. Frequency conversion starting and speed control mode can suit for different application conditions to avoid the impact of the load.
4-Filtrate receiver
Filtrate receiver, welded by plate, is used to collect filtrate pressed by screw body. Filtrate receiver is welded to the side plates directly, and there are flanges on the side to connect the external devices.
Working Principle
When the pre-thickening screw press dewatering unit operates, sludge will be transported to the mixing tank by sludge feed pump, at the same time, the solid polymer has been added to the mixing tank quantitatively by the polymer feed pump. Mixing motor drives the whole mixing system to make the sludge and polymer fully mixed and then flocs will be produced. When the liquid level arrives at the superior level of the liquid level sensor, the liquid level sensor gets the signal to make the motor of screw body operates, then begins to press the sludge which has flows into the screw body. Sludge will be transported to the outlet step by step by the effect of screw shaft; filtrate will flow out by the space of fixed annular plates and moveable annular plates.
Model Choice
| Model | DS Sludge treating capacity | Sludge flow treating capacity | |||
| 2500mg/L | 5000mg/L | 10000mg/L | 20000mg/L | ||
| YDL301 | 40-70 kg/h | ~16 m³/h | ~10m³/h | ~7 m³/h | ~3.5m³/h |
| YDL302 | 80-140 kg/h | ~32m³/h | ~20m³/h | ~14 m³/h | ~7 m³/h |
| YDL303 | 120-210 kg/h | ~48m³/h | ~30 m³/h | ~21 m³/h | ~10.5m³/h |
| YDL304 | 160-280 kg/h | ~64 m³/h | ~40 m³/h | ~28 m³/h | ~14 m³/h |
| YDL351 | 80-120 kg/h | ~32m³/h | ~16m³/h | ~12 m³/h | ~6m³/h |
| YDL352 | 160-240 kg/h | ~64m³/h | ~32m³/h | ~24 m³/h | ~12 m³/h |
| YDL353 | 240-360 kg/h | ~96 m³/h | ~48 m³/h | ~36 m³/h | ~18 m³/h |
| YDL354 | 320-480 kg/h | ~128m³/h | ~64m³/h | ~48m³/h | ~24 m³/h |
| YDL401 | 100-160 kg/h | ~40m³/h | ~26m³/h | ~16m³/h | ~8 m³/h |
| YDL402 | 200-320 kg/h | ~80m³/h | ~52 m³/h | ~32 m³/h | ~16 m³/h |
| YDL403 | 300-480 kg/h | ~120m³/h | ~78m³/h | ~48m³/h | ~24 m³/h |
| YDL404 | 400-640 kg/h | ~160 m³/h | ~104 m³/h | ~64 m³/h | ~32 m³/h |
Technical Specification
| Model | Screw specification | Distance from mud cake outlet to the ground (mm) | Overall dimensions(mm) | N.W | Operating weight | ||
| length(L) | width(W) | height(H) | |||||
| YDL301 | φ300×1 | 500 | 4000 | 1580 | 1900 | 1100kg | 1850kg |
| YDL302 | φ300×2 | 500 | 4000 | 1580 | 1900 | 1550kg | 2450kg |
| YDL303 | φ300×3 | 500 | 4000 | 1610 | 1900 | 2100kg | 3250kg |
| YDL304 | φ300×4 | 500 | 4185 | 2050 | 1900 | 2800kg | 4100kg |
| YDL351 | φ350×1 | 680 | 4340 | 1160 | 2300 | 1350kg | 2250kg |
| YDL352 | φ350×2 | 680 | 4500 | 1550 | 2300 | 2350kg | 3500kg |
| YDL353 | φ350×3 | 680 | 4800 | 2100 | 2300 | 3500kg | 5000kg |
| YDL354 | φ350×4 | 680 | 5100 | 2650 | 2300 | 4500kg | 6100kg |
| YDL401 | φ400×1 | 875 | 5150 | 1400 | 2560 | 3100kg | 5200kg |
| YDL402 | φ400×2 | 875 | 5150 | 1880 | 2560 | 4300kg | 6900kg |
| YDL403 | φ400×3 | 875 | 5350 | 2525 | 2560 | 6000kg | 9100kg |
| YDL404 | φ400×4 | 875 | 5500 | 3105 | 2560 | 7500kg | 12900kg |
| Model | Motor power | Washing water pressure | Clean water qty(L/h) | Maintenance frequency | Wearing parts replacing cycle (years) | ||||
| Screw shaft | Mixer | Total | Screw axis | Active ring | Drive shaft | ||||
| YDL301 | 0.75 | 1.1 | 1.85 | 0.1~0.2Mpa (Without high pressure flushing equipment) | 40 | 5 Minutes per hour | 10 | 5 | 2 |
| YDL302 | 1.5 | 1.1 | 2.6 | 80 | 10 | 5 | 2 | ||
| YDL303 | 2.25 | 1.1 | 3.35 | 120 | 10 | 5 | 2 | ||
| YDL304 | 3 | 1.1 | 4.1 | 160 | 10 | 5 | 2 | ||
| YDL351 | 1.1 | 1.1 | 2.2 | 60 | 10 | 5 | 2 | ||
| YDL352 | 2.2 | 1.1 | 3.3 | 120 | 10 | 5 | 2 | ||
| YDL353 | 3.3 | 1.5 | 4.8 | 180 | 10 | 5 | 2 | ||
| YDL354 | 4.4 | 1.1+1.1 | 6.6 | 240 | 10 | 5 | 2 | ||
| YDL401 | 1.5 | 1.1 | 2.6 | 80 | 10 | 5 | 2 | ||
| YDL402 | 3 | 1.5 | 4.5 | 160 | 10 | 5 | 2 | ||
| YDL403 | 4.5 | 1.1+1.1 | 6.7 | 240 | 10 | 5 | 2 | ||
| YDL404 | 6 | 1.1+1.1 | 8.2 | 320 | 10 | 5 | 2 | ||
Product Details
Object Site
