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Screw Press

Name: Screw Press
Brand: QuaSys Inc.
Availability: InStock

Krofta Filter Press

The Krofta Screw Press is an economical and environmentally friendly sludge dewatering solution. It operates based on screw extrusion principles, utilizing the increasing screw diameter and pitch to generate a powerful squeezing force. This force, combined with the narrow gap between the floating and fixed rings, effectively separates solids from liquids, making it a highly efficient sludge dewatering machine.

Krofta Screw Press Product Range

Model Number	Maximum Inlet Flow (m³/h) at 1% Consistency	Power (kW)	Wash Water Requirement (m³/h)
KSP 15	1.5	0.37	0.035
KSP 30	3	0.75	0.06
KSP 60	6	0.75	0.07
KSP 100	10	1.25	0.10
KSP 150	15	1.5	0.15
KSP 200	20	1.5	0.20
KSP 250	25	1.5	0.25
KSP 500	50	3.75	0.50
KSP 700	76	4.5	0.75

Quatech Screw Press

The Quatech Screw Press is an economical and eco-friendly sludge dewatering machine. It is a new type of equipment that uses screw extrusion principles to achieve solid-liquid separation. The process involves strong squeezing forces generated by variations in the screw diameter and pitch, along with the small gap between the floating and fixed rings.

Typical applications for wastewater treatment plants include dewatering thickened or un-thickened waste activated sludge (WAS), digested sludge from aerobic or anaerobic processes, and dissolved air flotation (DAF) sludges. The Quatech Screw Press is also effective for dewatering liquid sludges from various industries, including municipal applications. For municipal or bio sludge applications, the press typically produces a dewatered sludge cake with 20% dry solids content. It is a simple, slow-moving device that achieves dewatering through continuous gravitational drainage.

QUATECH SCREW PRESS PRODUCT RANGE

QSP Models	Max Inlet Flow @1% consistency (m³/hour)	Power (kW)	Wash Water Requirement (m³/hour)	Machine Weight (Kg)
QSP – 15	1.5	0.37	0.035	350
QSP – 30	2	0.75	0.06	450
QSP – 60	6	0.75	0.07	550
QSP – 100	10	1.25	0.10	750
QSP – 150	15	1.5	0.15	1000
QSP – 200	20	1.5	0.20	1200
QSP – 250	25	1.5	0.25	1300
QSP – 500	50	3.75	0.50	1450
QSP – 750	75	4.5	0.75	1880

Spare Parts & Advantages

Spare Parts

Screw Shaft
Screen Basket
Wiper Blades
Drive Motor
Bearings
Pressure Plate
Bearings & Shaft Sleeves
Seals and Gaskets
Flanged Connectors
Motor Couplings
End Plates
Discharge Nozzle
Liner Plates

Advantages

Compact design with significant energy savings
Simple operation and easy maintenance
Lower investment compared to belt filter presses, making it more cost-effective for lower flow rates

How a Screw Press Works

A screw press dewaters sludge continuously by feeding it through a slowly rotating screw inside a cylindrical screen. As the screw's pitch decreases along its length, the sludge is progressively compressed, squeezing out water through the screen while the solid cake is discharged at the outlet. Polymer is typically dosed ahead of the press to flocculate solids and improve dewatering efficiency.

Unlike batch-operated filter presses, a screw press runs continuously at low RPM, which is why it consumes significantly less power and requires less manual operator attention.

Screw Press vs Filter Press

Both dewater sludge, but they suit different situations — screw presses excel at continuous-duty biological sludge, while filter presses achieve higher cake dryness for chemical/industrial sludge. Read our full Screw Press vs Filter Press comparison and Total Cost of Ownership breakdown for a complete picture.

Technical Specifications

Parameter	Value
Capacity	1 to 500 kg DS/hr
Cake Dryness	18–25% dry solids
Operation	Continuous
Power Consumption	60–80% lower than an equivalent centrifuge

Applications

STP biological sludge dewatering
ETP sludge dewatering
Food & beverage industry sludge
Paper and pulp industry sludge

Why Choose QuaSys Inc. for Screw Press?

QuaSys Inc. supplies screw press machines sized to your actual sludge volume and characteristics, with polymer dosing guidance included during commissioning to optimize cake dryness from day one. AMC and spare parts support available pan-India.

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Specifications & pricing last verified: 03 Jul 2026

Frequently Asked Questions — Screw Press

What is the price of a Screw Press in India?+

Screw press prices range from ₹5–8 Lakh for a small 1–5 kg DS/hr unit to ₹40–80 Lakh for large 200–500 kg DS/hr machines. Total installed system cost depends on polymer dosing, conveyors, and civil work — contact us for a project-specific quotation.

What cake dryness can a screw press achieve?+

Screw press machines typically achieve 18–25% dry solids content in the dewatered sludge cake. Actual results depend on sludge type (biological vs chemical), polymer dosing accuracy, and feed sludge consistency — our engineers help optimise dosing during commissioning.

Screw press vs. filter press — which should I choose?+

Screw presses run continuously with lower manpower and power needs, ideal for biological (STP) sludge. Filter presses are batch-operated but achieve higher cake dryness (up to 35–40%), often preferred for chemical/industrial sludge. See our detailed comparison guide on the blog for a full breakdown.

How much floor space and power does a screw press need?+

Screw presses are compact and vertical, needing significantly less floor space than a filter press of equivalent capacity, and typically consume 60–80% less power since they run continuously at low RPM rather than high-pressure batch cycles.