Separation techniques
In addition to various techniques for refining valuable components from manure, Circular Values Industries also has various techniques for separating manure. A pre-separation of manure into thick and thin fractions is required for optimal processing of manure in nitrogen stripper or Osmosis plants. Circular Values Industries Manure separation is a modular concept, where (a combination of) different types of installations can be chosen to achieve optimal output. Products we can offer include:
- Belt Press
- Dewatering table
- DAF-unit (Dissolved Air Flotation)
- Polymaker
Belt Press & Dewatering Table
The screen belt press is designed to remove water from sludge/dung by mechanical means. It uses gravity and forces generated by filter belts that are guided around the rollers with increasing pressure. The sludge/dung remains on the belt and the water is removed. The process normally begins with the injection of polymer into the sludge/dung. The flocculated sludge/dung is fed through a main distributor onto the screen belt press, which provides for an even distribution of the sludge over the full working width of the belt where it is important to minimize flocculation.
The first phase of dewatering is the gravity zone for which so called chicane have been placed that accelerate dewatering in this phase and can drain the released water optimally because free dewatering trenches are created.
The thickened sludge/dung then makes the gentle transition to the next stage of dewatering: the wedge zone. In the wedge zone, pressure is applied to both the top and bottom of the sludge/dung through the gradual pressure build-up of two screening belts.
Deze fase van ontwatering is bedoeld om het slib te stabiliseren als voorbereiding op de toepassing van de hogedruk zone.
The final dewatering stage is the high-pressure zone, where the highest allowable pressure for certain sludge / manure is applied. The pressures are generated in this stage by conveying the sludge/dung around a series of so-called press rollers.
The first two rolls are perforated because a lot of water is released here and can (must) be discharged quickly, then follow the press rolls where the pressure force is further increased.... The dewatered sludge / manure discharges from the screening belt and falls onto a (not included in the delivery) discharge belt or the like, then the belts are cleaned via a water spray lance.
DAF
The Dissolved Air Flotation (DAF) unit from Circular Values Industries separates the floating fines that float on the surface of the liquid. The fine particles are removed by dissolving air in the added water, recycled water or directly into the wastewater under pressure and then releasing the air at atmospheric pressure into a flotation tank or basin. The air forms tiny bubbles that attach to the suspended matter, causing the suspended material to begin to float to the surface of the water. This floating layer can then be removed with a rotary skimming scraper. A relatively simple technique with low operating costs but good results.
The Farmcubes DAF is available in units from 1 to 500 m3 per hour. The DAF units are built in a resin-reinforced fiberglass construction to create maximum area of application without compromising the plant from the medium. All metal parts in contact with the fluid are in SS316.
Polymaker
With the Polymaker, phosphates are bound to the solids in the digestate on the basis of coagulation and flocculation. Through coagulation, the suspended solids destabilize and begin to clump together. This is done by adding iron trichloride. Flocculation turns the smaller flocs into a large floc, making them easy to separate. Flocculation is done by adding a custom-measured polymer.
The polymer is created at the polymer station, where the polymer is mixed and matures before being added to the digestate.
Using the polymaker, more solids can be removed in a follow-up separation step.
