RYDL404 Type Large Processing Capacity Multi-disc Screw Press Dehydrator with Pre-thickening System Sludge Dewatering Machine
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RYDL404 Type Large Processing Capacity Multi-disc Screw Press Dehydrator with Pre-thickening System Sludge Dewatering Machine

This RDL404 Type Large Processing Capacity Multi-disc Screw Press Dehydrator with Pre-thickening System Sludge Dewatering Machine can handle sludge with sludge concentration of 2500mg/l-50000mg/l.
  • RYDL404
  • RYDE-ENV (Ryde Environment)

Technical Specification

TypeRDL404Dry Sludge(DS) treating capacity400-640kg/h
Solid content2500-20000mg/LOutput sludge moisture content75-85%
Power supply

According to customer's requirement

Motor protection levelIP55 F
Net weight6400kgOperating weight12900kg
Dimension5500mm(Length)×3105mm(Width) ×2560mm(Height)
Energy consumption of the whole machine
Power consumption8.2kw

Water consumption320L/hWater supply pressure0.1-0.2MPa
Flocculant consumption 2-8g-PAM/kg-DS, when the concentration of PAM is 0.1-0.2%
(PAM means Polyacrylamide)
Detailed list of pipeline connection
Pipe port for sludge inletDN100  Flange Connection  PN1.0Mpa JB/T81-94
Pipe port for filtrate outletDN200  Flange Connection  PN1.0Mpa JB/T81-94
Pipe port for return flowDN150  Flange Connection  PN1.0Mpa JB/T81-94
Pipe port for sewage outlet of mixing tankDN65    Flange Connection  PN1.0Mpa JB/T81-94
Pipe port for filtrate outlet of mixing tankDN150  Flange Connection  PN1.0Mpa JB/T81-94
Pipe port for flushing water inletDN50    Internal Thread Connection G3/4"
Pipe port for polymer inletDN50    External Thread Connection G1"
Screw bodySS304/SS316/SS2205
Mixing tankSS304/SS316/SS2205
Electric control panelSS304/SS316/SS2205

1. The electronic control system can be customized according to customers'requirements. 

    It can add PLC and communication module.

2. For detailed information and drawings, please contact our engineer.

Product Description

Pre-thickening Screw Press Sludge Dehydrator adds pre-thickening system on the basic of multi disc screw press.

It is widely used for lower consistency sewage wastewater and is composed of thickening part & dehydration part.

The consistency range can be from 2500 mg/L to 20000 mg/L, thus the investment can be reduced a lot. It is professional interated thickening & dewatering sludge dehydrator.

The Multi-Disc Screw Press Dehydrator made by Yangzhou Ryde Environment, provides the most efficient method of dewatering for municipal wastewater treatment plants and a wide range of industrial sewage sludge, containing fats, oils, fibrous and abrasive substances.

Our Multi-disc screw press dehydrators are excellent for facilities, requiring a minimum of maintenance staff and operating costs reduction. The dewatering process is operated using minimal energy and requires the least amount of other resources (flocculant, rinsing water, wearing parts), as well as minimal maintenance and staff supervision, compared to any other dewatering equipment.


The core component of Multi-disc screw press dehydrator is the screw body, screw body has configuration with screw surrounded by filtering devices which have moving rings and fixed rings combined together and lined up.



The pre concentration system is composed of the pre-thickening system, the mixing blades and the thickening tank.

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 pre-thickening system due to the gravity function.

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.

As screw rotates, screw filters and dehydrates sludge while it is conveying sludge. Moving ring of the filtering device is moved upward as screw rotates and water was discharged from the gap made between the moving ring and fixed ring, so that sludge is filtered and dehydrated.

The space between the screw and filtering device configured by fixed ring and moving ring becomes narrower as it comes nearer to outlet. Pressure which squeeze sludge become bigger as the sludge moves toward to the outlet, so that the sludge is filtered and dehydrated tightly.


This type of dehydrator doesn't need cleaning since moving ring in the filtering device is always being moved by the rotating screws and clogging never happen. Therefore, in some wastewater treatment plants, waste sludge pulled out from aeration tank can be dehydrated directly without condensation. Polymer flocculation is used in conditioning before the dehydration.


Product Details


Model Selection

Pre-thickening Screw Press specification 1

Pre-thickening Screw Press specification 2

Pre-thickening Screw Press specification 3


Besides the above application, the multi-disc screw press dehydrator can be used in other applications, such as:

★ DAF float from slaughter houses and other agricultural processes

★ Food processing and wash-down wastes

★ Oil sludge from machining operations




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  rd@yzruide.com
  No.58,Runyang Road,Hanjiang Zone,Yangzhou City, Jiangsu Province, China

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