The Dewatering Process
Screw Press Sludge Dewatering
Multi Disc Screw Press

Screw press sludge dewatering/ thickening/ thickener also called Multi-Disc Screw Press, it's clog-free and can reduce the alleviation tank and sludge thickening tank, saving the cost of sewage plant construction. reducing the Minimized waste water and saving the cost of transportation.

Screw press uses the screw and the moving rings to clean for itself as clog-free structure and controlled by the PLC controller automatically, and it is based upon a new technology that can replace the old/traditional filter press as like belt press and frame press, and the main thing is that screw speed is very low, so that’s reason cost low power and water consumption in contrast to the separator.

Sludge Dewatering Press is gives high performance sludge dewatering system. It used the main central screw auger and a slowly oscillatory multi-disk filter to give the gradually increase the pressure on flocculated sludge to produce an exceptionally dry sludge cake. With electrical, water and polymer usage, and high  capture rates of the system is very cost effective.



Sludge Cake Discharge

Sludge Dewatering Press can be provided with all instrumentality needed for dewatering enclosed and industrial plant/factory mounted, piped and wired on one stainless-steel skid. This instrumentality includes the sludge pump, wash pump, chemical compound dosing system and control panel. The system features are fully automated one push button startup and ending. Once started up the system will run unattended and may be set to shutdown automatically with no operator intervention.

Sludge Dewatering Press is builded in stainless steel 304/316.

Features:

• encircled to reduce odors and noise (lower than 65Db).

• terribly low wash water usage(1/8 compared with belt press)

• terribly low power consumption(1/20 compared with centrifuge)

• High cake solids

• marginal operator demand

• straightforward to control and maintain

• motor vehicle start-up, run and termination.

• bit screen operation facultative

• Sludge Flow and Cake watching System.

Advantage:

1.Uniform and accurate dispensing savings running cost.

2.Unique flocculating agent to make sludge dewatering easier.

3.System can be programmed to make the operation more convenient and accurate.

4.Simple process, low system investment, highly efficient and energy-saving dewatering.

Widely application
Sludge Concentration

Exclusive pre-concentration design , applicable sludge concentration of 2000mg/L~50000mg/L Due to innovation of the structure design .Highly suitable to various high and low concentration sludge most especially the oily ones. Widely application range including municipal sewage ,food wastewater, slaughter house ,printing and dyeing, oil chemical industry, paper making ,leather ,pharmacy and other different kinds of sludge dewatering.


Clogging Free
Coggling Free

Due to the moving of the fixed rings and moving rings self -cleaning. The ubiquitous clogging is avoided. Handing oily sludge while not bother whereas separating the water from the sludge simply. Above all, no want giant quantiry of flushing water and no odor, not required secondary pollution for the sludge dewatering method.


Operation Cost Saving
Operation Cost Saving

Screw Press relles on the inner pressure of the filter chamber and also the rotating speed is as slow as 2~4rpm. the average unit power consumption is 0.1~0.01kwh/kg-DS (1/8 of Belt Filter Press and 1/20 of Centrifuge) . Greatly minimize the running value of waste water treatment system.


Capacity and Scalability:-

Envista tech system multi disc screw press is designed to cater to various capacities. Systems are available from 0.2m3/h – 133.5m3/h. Due to its modular design and compact construction, the capacities can be easily scaled up by running system in parallel to cater to almost any capacity as required and as when required. We can also optimize the designed for cost and efficiency based on your customer requirement using the standard model.


Automatic Operation

The System can be fully automatic with PLC Controls. Option of variable frequency drive(VFD) is Available to control the dosing and the screw speed to automatically adjust to the varying loads of the effluent. The system can run continuously unmanned.

dewatering machine
Handles oily sludge

The self-cleaning mechanism and stainless steel structure unable multi disk screw pre to be ideal to dewater oily sludge. Due to the rotation of the helical axis, the moving rings detach from the fixed rings while continuously cleaning itself. As a result clogging is avoided. Therefore it can easily handle oily sludge.

dewatering machine
The Dewatering Process

The Multi-Disc Screw Press is a robust Machine designed for reliability, Consistency and continuous operation. The machine can be fed with sludge directly from the dewatering and oxidation pit eliminating the thickening tank and the sludge storage tank. The machine incorporates multiple processes all in one single continuous operation. The brief process is as below;


dewatering machine
 

1.Flocculant preparation:- The flocculant is prepared in the flocculant preparation tank at the recommended concentration.

2.Flocculation:- Polymer flocculant is added in the flocculation tank filled with sludge. Efficient agitation ensures fast agglomeration and flocculation of the suspended particles into the large flocks that can be separated

3.Sludge Thickening:- The flocks are transported through the thickening zone onto the dewatering zone. A series of fixed and moving rings filters the water as the sludge moves to the dewatering zone. The filtered water flows down through the rings to be filtered water tank below.

4.Dewatering:- The Sludge is transported from the thickening zone to the dewatering zone by the screw conveyor. The spiral conveyor in the screw cylinder is specially designed to move the sludge forward efficiently while gradually compressing them by the pushing the sludge against the black plate. As the sludge is compressed, most of the water is squeezed out of the sludge. The squeezed out water from the sludge is filtered by the series of fixed and moving rings. Clear water flows to be filtered water tank below. The dewatering sludge exist from the outlet at the top and falls down. The constant rotation of the screw ensures the sludge is pushed forward, thickened, dewatered and existed while filtering the water, all at the same time.

5.Dryness and discharge control:- the sludge cake dryness can be adjusted by the adjustable end plate. The end plate adjustment enables control of the cake dryness and the rate of output from the sludge exit port. This is provided to handle sludge with varying viscosities.

Multi Disc Screw Press

Our multi Disc screw press relies on advanced as compare to ancient dewatering systems which might be simply blocked by low targeted sludge. The Envista screw press permits for the automated continuous sludge action, thickening, dewatering and filtrate discharging. The thickening zone permits the system to method each extremely targeted sludge furthermore as sludge with a high-water content.

• Exclusive pre-thickening allows a good solid concentration starting from ten,000mg/l to fifty,000 mg/l

• High potency with alittle footprint

• Low power consumption (less than five-hitter of a centrifuge)

• Very tide usage (less than 1 Chronicles of identical belt filter press)

• Auto start-up, run and closure

• Self-cleaning.

• No interference or backwash water.

• Double nozzles for superior cleansing and remotion.

• Able to handle oily sludge furthermore as fibrous sludge.

• Sealed system = No odors/bad smell.

• Wear free.

• Sludge flow and cake observance system.

• Exclusively the screw shaft for sludge thickening and inorganic material.


Components

• 304 SS Screw, Shaft, assortment Basin, action Tank, Main Body

• Sludge thickening & dewatering zone

• Sludge action tank

• Filtrate assortment tank

• Automatic / machine-controlled instrument panel

• Fixed plates and moving plates rather than filter fabric


How it Works?

The conditioned sludge flows into the filter chamber from the flocculation tank and is pushed to the discharging end. The thread on the shaft gets progressively tighter as the waste water flows through the system, this causes the pressure on the sludge to increase. The water is then separated from the sludge. The movement of the moving and fixed rings cleans the gaps between them and prevents blockage traditionally experienced in similar systems. The filtered sludge cakes is pushed forward by using the shaft and finally discharged from the end.

dewatering machine

Capacity and Scalability:- Envista tech system multi disc screw press is designed to cater to various capacities. Systems are available from 0.2m3/h – 133.5m3/h. due to its modular design and compact construction, the capacities can be easily scaled up by running system in parallel to cater to almost any capacity as required and as when required. We can also optimize the designed for cost and efficiency based on your customer requirement using the standard model.