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Custom Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251

Home / Product / Screw Press Sludge Dewatering Machine / Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251
  • Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251
  • Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251
  • Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251
  • Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251

Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251

Food Grade Energy Saving Press Dewatering Machine, The spiral screw sludge dewatering machine adopts advanced screw pressing technology, which can effectively separate the water in the sludge and achieve energy-saving and efficient dewatering effect. Made of food grade materials, it meets strict hygiene standards to ensure that the materials are not contaminated during the dewatering process. Our dewatering machine is suitable for various sludge treatment occasions, especially in the food, beverage, pharmaceutical and other industries. With compact structure and small footprint, it can achieve efficient sludge dewatering in a limited space.

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QXDL-251
Food Grade Energy-Saving Press Dewatering Machine
Spiral Screw Sludge Dewatering Machine
15-30 kg/h Dry Sludge Capacity
0.92 kW Total Power
500 kg Machine Weight
2690 mm Length
Mechanism

Operational Principle

The Food Grade Energy-Saving Press Dewatering Machine utilizes a variable-pitch spiral shaft enclosed within a set of moving and stationary rings. As the screw rotates, the decreasing volume between ring stacks generates progressive compression, forcing free water and bound water through the ring gaps. The slow rotational speed (3-6 RPM) avoids shear degradation of the sludge flocs, preserving food-grade process integrity. A self-cleaning differential motion prevents accumulation of fibrous or sticky materials, ensuring continuous operation without chemical cleaning agents. The filtrate exits through the lower casing while dewatered cake advances toward the discharge cone, where adjustable back-pressure regulates final dryness.

Specifications

Technical Parameters

Equipment ModelQXDL-251
Dry Sludge Capacity15-30 kg/h
Dimensions (L×W×H)2690 × 880 × 1600 mm
Machine Weight500 kg
Power Consumption0.92 kW
Drive Speed3-6 RPM (adjustable)
MaterialsSS304 food-grade contact parts
01
Food Grade Construction
All sludge-contact surfaces manufactured from stainless steel 304 with electropolished finish. Meets sanitary standards for food processing, dairy, and beverage applications. Absence of lubrication points in the dewatering chamber eliminates contamination risk.
02
Energy Efficiency Profile
Total connected load of 0.92 kW results in operational expenditure 70 percent lower than centrifuge alternatives. The direct-drive helical gear motor consumes power only proportional to torque demand, reducing idle energy waste.
03
Fully Automatic Operation
Integrated torque sensor adjusts feed rate and back-pressure cone position without operator intervention. Modbus RTU output enables remote monitoring of cake dryness and runtime counters.
04
Compact Footprint Design
Occupies 2.4 square meters of floor space while processing 15-30 kg/h dry solids. Vertical integration of thickening and dewatering zones eliminates need for separate gravity thickener.
Engineering Deep Dive

System Components & Material Flow

A
Inlet & Thickening Zone
Flocculated sludge enters through a 150mm flanged port. The initial spiral section features large pitch (180mm) to allow free water drainage through stationary rings. Gravity thickening raises solids concentration from 0.5-2 percent to 5-8 percent before compression.
B
Compression & Dewatering Chamber
Progressive pitch reduction to 65mm creates mechanical pressure up to 0.6 MPa. The differential rotation between moving rings (driven by spiral friction) and fixed rings provides continuous gap cleaning. Dewatered cake dryness typically reaches 20-28 percent DS.
C
Discharge & Back-Pressure Control
Adjustable cone at the outlet regulates compression ratio. Pneumatic or manual adjustment allows fine-tuning of cake dryness from 18 percent to 30 percent based on sludge type. Quick-release clamp enables easy access for inspection.
Application Fields
Food processing sludge (potato, fruit, vegetable)
Dairy effluent activated sludge
Brewery and distillery spent grains dewatering
Meat and poultry wastewater residuals
Pharmaceutical fermentation biomass
Biogas digestate from food waste
Edible oil manufacturing sludge
Confectionery and sugar refinery waste
Operational Diagnostics & Field Solutions
Cake discharge too wet (above 80 percent moisture)
Increase back-pressure cone pressure by turning the adjustment screw clockwise 1-2 full turns. Verify feed sludge concentration remains above 2 percent solids. Reduce hydraulic loading if torque exceeds 75 percent of rated value.
Filtrate contains suspended solids
Inspect ring stack for foreign objects. Run flushing cycle for 5 minutes at low speed (2 RPM). Check polymer mixing ratio; optimal range is 4-6 grams polymer per kilogram dry solids for food-grade sludges.
Motor current fluctuating or frequent overload
Remove any fibrous winding material from the spiral shaft through inspection ports. Ensure upstream screening (2mm or finer) is installed. Reduce feed rate temporarily until torque stabilizes below 90 percent.
Intermittent discharge or bridging at inlet
Check feed pump consistency; install a variable frequency drive on the feed pump to match press capacity. For sticky sludges, introduce 2-3 percent dilution water at the inlet to improve flow.
Maintenance & Safety Protocol
  • Disconnect power supply before opening any access panel or performing internal inspection.
  • Lubricate the main drive chain (if equipped) every 500 operating hours with food-grade grease.
  • Inspect mechanical seal every 3 months; replace if leakage exceeds 5 drops per minute.
  • Clean the ring stack with low-pressure water (below 0.3 MPa) to avoid ring deformation.
  • Verify torque limiter calibration annually; slip torque should be set to 110 percent of motor nameplate torque.
  • Do not operate without proper grounding; ground resistance must be less than 10 ohms.
  • Install emergency stop pull-cord along the entire length of the machine for accessible shutdown.
Startup & Shutdown Sequence
1. Pre-start: Turn on dilution water for 30 seconds to wet ring surfaces.
2. Start screw shaft idle for 15 seconds to verify rotation direction.
3. Begin sludge feed at 50 percent rated flow; ramp up to full capacity after 2 minutes.
4. During shutdown: Stop feed pump first, allow machine to run for 8 minutes to discharge remaining solids.
5. Flush with clean water for 3 minutes while spiral rotates.
6. Run dry for 2 minutes before stopping the drive motor completely.

Equipment Model

 QXDL-251

Dry Sludge Treatment Capacity

 15-30 Kg/h

Equipment Dimensions

 L2690mm × W880mm × H1600mm

Machine Weight

 500kg

Total Power Consumption

 0.92 kW
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Yangzhou Qinxin Environmental Protection Technology Co., Ltd.

  • 14000+

    Factory Area

  • 18+

    Honorary Certificate

Yangzhou Qinxin Environmental Protection Technology Co., Ltd. is China Custom Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251 Suppliers and Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251 Company. This is an enterprise that combines industry and trade and is committed to research and development, production, and sales of environmental protection equipment, Our company is mainly engaged in Food Grade Energy-Saving Press Dewatering Machine Spiral Screw Sludge Dewatering Machine QXDL-251, stacked screw sludge dewatering machines, PAM integrated dosing devices, sludge low-temperature drying systems, solid-liquid separators, other sewage treatment equipment, mainly serving municipal, food, petrochemical, aquaculture, papermaking, leather, brewing, printing and dyeing, chemical, pharmaceutical, medical and other industries. Adhering to many years of practical experience and research and development in the production of environmental protection equipment, the company is AAA-level contract-oriented and trustworthy and has obtained a number of patents and quality management system certifications, environmental management system certifications, and occupational health and safety management system certifications.

HONOR & CERTIFICATE

Our products have obtained, include EC-Type Examination Certificate, BV, MODE, DNV, GL Certificate, EC Attestation of Conformity, Certificate of Type Approval for Marine Product and Lloyd’s Register Quality Assurance.

  • Environmental Management System Certificate
  • Environmental Management System Certificate
  • Quality Management System Certificate
  • Quality Management System Certificate
  • Occupational Health & Safety Management System Certificate
  • Occupational Health & Safety Management System Certificate
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