PWTech - Model ES353 - Volute Dewatering Press
From Biosolids and Sludge Handling Products
This innovative sludge dewatering product offers many advantages over conventional sludge management methods. Originally developed in Japan, the Volute Dewatering Press is patented worldwide, with more than 650 installations. The key to the process is the unique dewatering drum design. This drum is able to achieve both thickening and pressing (dewatering) of the sludge in a single, compact operation. It can take sludge as dilute as 0.1% solids, directly from a biological process, such as an oxidation ditch, and produce a cake of over 25% solids.
Concept
The PWTech Volute Dewatering Press is a unique product, originally developed in Japan, that offers many advantages over current sludge management practices. Patented worldwide, the Volute Dewatering Press is presently used in over 2800 installations.
The key to the process is the “dewatering drum.” This drum can achieve both thickening and pressing (dewatering) of the sludge in a single, compact operation. Thus the Volute Dewatering Press can take sludge as dilute as 0.1% solids directly from a treatment process, such as an oxidation ditch or clarifier, and produce a cake of over 20% solids. Separate thickening, storage, and conditioning processes are eliminated. In addition, the need for operators, continuous use of wash water, and high power consumption are eliminated.
Unique Dewatering Drum Design
Screw presses are a neat, simple way of conveying and dewatering sludge. They typically have a single bearing or bushing at one end and a gear drive at the other end–simple, robust, and low maintenance. However, the screws for dewatering typically have a casing with openings in it to allow fluid to escape from the sludge as it is pressed. If these openings are too small, they constantly plug with solids, preventing fluid from leaving the sludge. Therefore, the openings are usually fairly large, which means that the sludge cannot be pressed too much as it will extrude through the openings. The result is that screw presses generally do not achieve good cake solids.
Performance
Unlike traditional screw presses, the Volute Dewatering Press features the unique “dewatering drum.” Spacers and fixed rings are held in place on tie rods. Moving rings, slightly smaller than the outer diameter of the screw and slightly narrower than the spacers, are located between the fixed rings and are moved by the screw. The constant movement of the moving rings cleans the fine gaps between the moving and fixed rings, preventing clogging. The moving rings also cut into the sludge cake, allowing additional surface area for the release of moisture.
The initial section of the dewatering drum is the thickening zone. The filtrate is discharged here. The pitch of the screw narrows and the gaps between the rings decrease towards the end-plate where solids are discharged. Pressing of the sludge occurs here.
Process Description
Sludge is fed into a mixing tank where polymer is thoroughly mixed in. The sludge then passes through a flocculation tank where gentle mixing and flocculation occurs. From there, the sludge overflows into the dewatering drum and is pressed. The entire operation is controlled by the Volute Dewatering Press control panel.
The Volute System
The Volute Dewatering Press is designed to be a fully automated system capable of starting up, operating, and shutting down with no operator intervention. This is possible because the control panel is designed to control the automated polymer feed system, the unit sludge feed pump, and any conveyors required to remove dewatered cake, all in addition to the Volute Dewatering Press itself. Thus, all components of the dewatering system work together, automatically starting up, operating, and shutting down as required.
PWTech can provide complete systems or work with other suppliers to provide an integrated package. In addition, unit operating and alarm outputs for connection to plant PLC/SCADA systems are standard.
Advantages
- No need for thickeners, sludge storage, or separate dosing facilities
- No need for regular operator attendance
- Produces high-quality filtrate, does not need to return to the head works (i.e. high solids recovery)
- Extremely low power consumption–up to 95% less than many other dewatering processes
- Low noise and odor generation
- Low wash water consumption
- Able to handle oily sludges
- Flexible–can deal with feed sludges from less than 0.2 % to greater than 4%
- Rapid installation
Operation and Maintenance
The Volute Dewatering Press requires very little operator attention, other than periodic inspection and chemical replenishment. As a fully automated process, it controls the operation of wasting sludge directly from the biological process or clarifier, chemical make-up and dosing, flocculation, and then dewatering. Depending on operating conditions, a partial overhaul of the dewatering drums may be required every three years. This two-hour operation is undertaken in the field, with minimal disruption to plant operation.
More about Volute Dewatering Press
Applications
The PWTech Volute Dewatering Press has been installed to handle a wide range of sludges. It is especially useful when sludges have a high oil and fat content that would blind filter materials.
Other sludges the Volute Dewatering Press has been shown to work well on include:
- DAF float from slaughter houses and other agricultural processes
- Food processing and wash-down wastes
- Oil sludge from machining operations
- Wastes from textile processing
A Revolution In Municipal Solids Handling
The PWTech Volute Dewatering Press can be set up to achieve both wasting and dewatering of sludge in a single operation. By either connecting the Volute Dewatering Press directly into the biological process or into the RAS piping the unit can automatically switch on and waste and dewater the sludge in one operation. Key benefits of this include:
- Reduction in operator time with the wasting operation
- No need for sludge storage tanks and additional pumping facilities and odor control–can be used to free up existing sludge storage facilities for other uses
- Increased process stability (wasting can occur over long periods of time or several times a day)
- Direct dewatering prevents additional nutrient load on the treatment plant by removing solids from the system before they break down and release nutrients.
A Revolution in Municipal Solids Handling
The PWTech Volute Dewatering Press can be set up to achieve both wasting and dewatering of sludge in a single operation. By feeding the Volute Dewatering Press directly from the biological process or the RAS piping the unit can automatically switch on and waste and dewater the sludge in one operation. Key benefits of this include:
- Reduction in operator time with the wasting operation
- No need for sludge storage tanks and additional pumping facilities and odor control–can be used to free up existing sludge storage facilities for other uses
- Increased process stability (wasting can occur over long periods of time or several times a day)
- Direct dewatering prevents additional nutrient load on the treatment plant by removing solids from the system before they break down and release nutrients
More about Volute Dewatering Press
Applications
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Sludge dewatering for sludge management - Water and Wastewater - Sludge Management
This innovative sludge dewatering product offers many advantages over conventional sludge management methods.
Downloads related to this product
PWTech - Volute Dewatering Press - Brochure
Videos related to this product
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Volute Dewatering Press - Video
A walk-through of the Volute Dewatering Press. For a free pilot demonstration at your facility, contact PWTech via the big purple button at http://pwtech.us/ !
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PWTech Volute Dewatering Press and Volute Thickener - Video
Haven`t seen a Volute yet? They`re becoming the popular choice for new construction, upgrade, and in-place replacement of older water treatment and wastewater dewatering equipment. PWTech`s Volute Dewatering Press includes features unavailable on any other dewatering and thickening equipment to reduce operating costs and increase reliability, even under conditions that would force most biosolids and industrial wastewater presses to shut down.
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PWTech ES353[2] Volute Dewatering Press - Video
PWTech`s Volute presses offer a unique option- buy what you need now, upgrade your dewatering capacity later. By purchasing a multi-drum model and reserving space for one or more drums, the modular Volute Dewatering Press allows you add 50%-200% increased throughput when your dewatering requirements increase.
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PWTech ES350 Volute Dewatering Press Cake Solids - Video
Some screw presses use hydraulic rams, cones, or other complex methods to adjust pressure inside the press. PWTech`s Volute Dewatering Press uses a simpler approach- two bolts are easy to adjust and hard to break.
An ES350 drum like the one shown can dewater up to 700 pounds per hour of dry solids at maximum design load, or up to 70 GPM per drum. When combined into an ES356 Volute Dewatering Press, that`s over two tons per hour!
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PWTech Volute Dewatering Press Filtrate - Video
PWTech`s Volute Dewatering Press uses the patented dewatering drum technology to increase solids capture and filtrate clarity, and reduce wash water use and maintenance. This ES350 drum is running at full speed while capturing 99% of suspended solids. The slowly moving rings allow the press to prevent clogging and binding of the screening surface, while a quick rinse turns on a few times an hour for primarily cosmetic purposes.
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PWTech Volute ES201 on High FOG Sludge - Video
With total suspended solids of up to 15% and lots of fats, oil and grease, this meat processing factory would quickly blind a belt press or conventional screw press. This little Volute ES201 is going strong at over 300 pounds of dry solids per hour, 400% of rated capacity!
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PWTech Volute ES302 Running at Full Operational Speed - Video
This ES302 Volute Dewatering Press from PWTech uses precision cut stainless steel rings throughout the entire dewatering drum. As seen here, half of the rings are allowed to move with the screw`s slow but constant rotation, while the other half are fixed in place. The combination of fixed and moving rings produces a self-cleaning screen that is practically impossible to clog or bind up, and allows the Volute to deliver high throughput in a compact footp
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PWTech Volute ES302- Twice the Cake! - Video
The Volute Dewatering Press from PWTech uses the patented Dewatering Drum to produce drier cake from smaller presses with less electricity, wash water or maintenance than conventional screw presses and belt presses. This mid-sized ES302 uses a pair of 30cm/12" Dewatering Drums to produce up to 700 dry pounds of dewatered cake per hour.
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PWTech Volute Dewatering Press Cake Solids - Video
The Volute Dewatering Press from PWTech uses the patented Dewatering Drum to produce more dry cake from smaller presses than conventional screw press and belt press technology allows.
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PWTech Volute Dewatering Press Drums - Video
The Volute Dewatering Press uses a system of fixed and moving rings to dewater almost any sludge. The screw inside turns at a slow rate, often less than 1 RPM, causing the moving rings to cut into the cake solids inside and expose more surface for dewatering. Because the rings move and clean themselves, they cannot be clogged like a conventional screw press.
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PWTech Volute Dewatering Press Cake Solids Closeup - Video
The Volute Dewatering Press from PWTech is a highly automated, compact, low-energy method of dewatering almost any sludge. Here, a dry cake of over 25% solids is pressed from municipal wastewater. Volutes can deal with struvites and oily sludges that clog conventional presses, and provide a lower cost of ownership across a wide variety of industrial and municipal wastewater feeds.
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Volute Dewatering Press in Action - Video
Volute Dewatering Presses provided by PWTech have been used to dewater many types of municipal and industrial sludges, to include food processing and wash-down wastes, DAF float, potable water sludges, oil sludge, and of course biological waste sludges. You can see one in action here. With the low power and noise levels, the sound of water dripping off the press is one of the loudest noises in the video! For a free pilot at your facility, just click the
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Volute Dewatering Press Cake - Video
What comes out of the Volute Dewatering Press? It`s called "cake", a much dryer version of what went in. You probably don`t want to eat this sort of cake though.
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