Civil and industrial water purification plants produce large quantities of sludge. The sludge collected from the sedimentation tank goes through thickening and dewatering processes to make it ready to manage and easy to dispose, and for possible reuse, when permitted.
Allegri Ecologia sells filter presses for sludge lines of sewage treatment plants. Depending on the filter pressing technology employed, the filter presses offered by Allegri Ecologia perform either sludge dewatering or sludge thickening and dewatering. The presses separate water from solids in the sludge by increasing its density and reducing it to a more manageable size.
MP SLUDGE PRESS SM Dewatering Filter Press with Moving Stator
Purpose of the filter press with moving stator
The MP SLUDGE PRESS SM dewaters sludge with innovative moving stator technology.
The pressing system treats various types of sludge: biological, oily and from chemical-physical processes.
Operation of the SM sludge press
The sludge is conditioned with polyelectrolyte in a dedicated tank supplied with the system and enters the press due to gravity. The press consists of a rotating auger inside a draining cylinder made of alternating fixed and moving discs. The conical pivot and variable pitch auger pushes the sludge towards the drain outlet acting on the moving discs that rub against the fixed ones, allowing continuous passage of the filtered water through the gaps between the discs. At the discharge outlet, a plate further compacts the sludge until it becomes easy to collect.
Features of the SM filter press
- Excellent sludge dewatering, thanks to the auger variable speed and the suitable adjustment of the outlet plate.
- Anti-clogging press. The rotating auger makes the moving discs rotate continuously onto the fixed discs, keeping the gaps unclogged.
- A back washing system keeps the discs clean and it is automatically activated when needed (at the end of the work cycle, especially after long processes or in case of particularly complex sludge).
- Back washing consumes much less water than other types of sludge dewatering.
- The press operates automatically 24 hours a day without operators.
- It is noiseless, vibration-free, with noise thresholds below 60-62 Db.
- The press is entirely made of AISI 304 steel (AISI 3161 upon request).
- Depending on the performance required, the sludge press can be made with several parallel augers.
- All connected equipment can be viewed and adjusted via the touch screen of the control panel.
Advantages over other sludge dewatering systems
- Small overall dimensions
- Anti-clogging
- High density of dehydrated sludge
- 24-hour automation
- Variable degree of desired sludge density
- Very low energy consumption
- Simple to use
- Low consumption of polyelectrolytes
- Minimal maintenance
- Very low washing water consumption
- No supervision needed during operation
Where is the SM Sludge Press used?
- Urban waste water treatment plants
- Dairy sector treatment plants
- Slaughterhouse/meat processing treatment plants
- Paper industry treatment plants
- Food industry treatment plants
- Livestock farms treatment plants
- Pharmaceutical industry treatment plants
- Textile industry / laundries / leather industry treatment plants
MP SLUDGE PRESS C with Filtering Cylinder
Purpose of the filter press with mobile filtering cylinder
MP SLUDGE PRESS C is a high-performance sewage sludge press for sludge thickening and dewatering, specifically suitable for treatment of biological sewage sludge.
Operation of the Sludge Press C
The pressing system works with variable pitch auger and conical shaft that rotates and presses the sludge inside a high-drainage filtering cylinder with different spacing. To optimise both thickening and dewatering processes, the sludge to be treated must be conditioned with polyelectrolyte using a flocculator (at variable speed, included in delivery).
In the first section of the press, the pressure exerted by the feed pump drains the water present in the sludge through the cylinder with larger filtering spacing.
In the second section, with smaller spacing, the sludge volume is reduced as it is pressed between the coils and against the filtering cylinder.
In the third section, the residual water in the sludge is extracted due to the counter pressure exerted by the pneumatic cone onto the outlet drain and to further reduction of the spacing in the filtering cylinder.
The degree of counter pressure and the travel time of the sludge through the machine can be varied depending on the type of sludge to be treated.
Upon reaching the discharge outlet, the dehydrated sludge is ejected from the press.
A scraper rubber placed on the outer perimeter of the auger coils keeps the inner surface of the filtering drum clean. A sliding wash ring operated by a special gear motor keeps the outer surface of the grid clean.
Features of the Filter Press C
- Safety sensors protect the filter press from overpressure, managing the automatic shutdown of the connections feeding the sludge and the polyelectrolyte.
- A touch screen on the control panel manages remotely the equipment connected.
- The C sludge press is a particularly noiseless and vibration-free machine, with decibel levels of no more than 60 dB.
- The press is entirely made of AISI 304 steel (AISI 316 upon request).
Advantages of the C sludge press compared to other systems
- Very low noise level
- Small overall dimensions
- High density of dehydrated sludge
- 24-hour automation
- Variable degree of desired sludge density
- Very low energy consumption
- Simple to use
- Low consumption of polyelectrolytes
- Minimal maintenance
- No supervision needed during operation
