Sludge Dewatering Equipment
- Delivery and setup
- Dewatering Bags
- Screw dehydrators
- Filter press
Sludge Dewatering Equipment
Before the isolated sewage sludge can be utilized, it goes through a stage of dehydration.
Sludge dewatering reduces its volume. Therefore, the mechanical dehydration of sewage sludge is now widespread. Today,mechanical sludge dewatering is the most effective method used for sludge treatment.
Currently Bioxica uses various types of mechanical dewatering systems such as:
- dewatering bags
- screw dehydrators;
- filter presses
Delivery and commissioning of Sludge Dewatering Equipment.
Bioxica carries out the whole range of services associated with treatment facilities, including the supply and commissioning of equipment for sludge dewatering, such as screw dehydrators, filter presses, dewatering bags, etc. Our experts will select the best method of sludge dewatering, then hold the consultations on setup and operation of mechanical equipment. They’ll help to calculate and select the best equipment for each specific case, and commission mechanical dewatering installations.
Read MoreSludge Dewatering Equipment (OZK)
A sludge dewatering installation dehydrates primary or mixed stabilized active sludge.
This setting takes place in a dewatering bag. It is simple, easy-to-use, flexible, and consumes little power.
The sludge is pumped through a feed conduit from a sludge pit to the tank. Flocculant is selected depending on the type of sediment. It is fed to the conduit via metering pump. The section of the pipeline behind the feed point is the site of flocculant mixing with the sludge, where the sludge flocculation begins.
Flocculent sediment comes from the tank to the filtration bags. The sediment is detained in the bags, while filtered water flows through a recovery line to the head of the treatment facilities. The dewatering device is protected by the overflow pipe.
Dewatering of 10-20% within a 24 - hour cycle can be reached. After storage for 40 - 60 days, the precipitate is dehydrated at 20 - 40%.
All the equipment is made of corrosion-resistant materials. The housing is welded from steel corrosion-resistant sheets and profiles. The supply and mixing pipes are made of polypropylene.
The unit has a structure that prevents blockage of the drum. Therefore, it requires a minimal amount of washing water.
Background noise is almost absent, as the plant has no highly load and highly speed nodes.
This dehydrator consumes less energy than other systems of dehydration.
The installation does not require the constant presence of staff, as it works in automatic mode.
Screw dehydrators are used for all kinds of dehydrated sludge that form in the wastewater treatment process.
Screw dehydrators
The unit is designed to dewater sludge with a concentration of suspended particles from 2000 mg / l to 35,000 mg / l.
After treatment with flocculant, the sediment is fed to a dewatering drum.
The dewatering drum consists of a screw rotating at a constant speed between fixed rings, moving rings, and gaps.
The screw pushes the edges of moving rings of the dehydrator, which leads to constant movement between the gaps and thus prevents blockages.
During the dehydration, the filtrate flows out from the gaps between the rings and is guided to the head of treatment facilities. The width of the gaps decreases towards the outlet of the dewatered sludge. The pitch of the screw decreases as well, creating a pressure in the dewatering zone. At the end of the screw is a mounted pressure plate that regulates the internal pressure in the drum.
The dewatered sludge with a moisture content of less than 81% is discharged into a container for subsequent disposal.
The unit has a structure that prevents blockage of the drum. Therefore, it requires a minimal amount of washing water.
Background noise is almost absent, as the plant has no highly load and highly speed nodes.
This dehydrator consumes less energy than other systems of dehydration.
The installation does not require the constant presence of staff, as it works in automatic mode.
Filter presses are used for sludge dewatering in wastewater treatment plants. The sediment has minimal humidity after passing through the filter press, which simplifies its disposal.
There are filter presses of various designs: frame, chamber vertical and horizontal, band, drum, screw (auger).
Currently, Bioxica uses the MONOBELT® dewatering system with belt filter presses on their wastewater treatment plants.
Belt filter press MONOBELT®
The sludge dewatering system MONOBELT® includes two parts: pre-thickener and filter press.
The pre-thickener performs the first separation of liquid and solid bodies.
The filter press dispenses slurry on the surface of the band and passes it through the perforated cylinder under high pressure. MONOBELT® filter presses are made entirely of stainless steel AISI 304, occupy a small area, and use a small amount of washing water and electric power.
The sludge pre-thickening system on the filter presses uses drum technology with the "Archimedean screw" inside; it is more efficient and is 4 times more durable compared to the pre-thickening tape technology.
Filter presses are equipped with a "continuous" belt with a long durability. The manufacturer provides a 3-year or 10,000 hour warranty on the work tape.
For additional safety, the filter presses are completely enclosed and environmentally friendly with no smell.
Lubrication and maintenance are performed without stopping operation.
For their design and effectiveness, the MONOBELT® filter presses were awarded the prestigious international Frost & Sullivan Award for Best Innovative Product in 2007.
The sludge dewatering process is preceded by the following technological equipment:
- belt press;
- installation for preparation of polyelectrolyte (flocculant);
- screw conveyor;
- sludge metering pump;
- polyelectrolyte metering pump (flocculant);
- compressor;
- static mixer.
- Sludge dewatering technology involves the use of:
- dosing sludge;
- flocculant;
- filtering;
- automatic control of the mechanical equipment.
