Product Description

Operation principle of the Drycake Post-Depackager Grit and Plastic Removal

The SEDITANK-Plastifoat is a piped-in and-out grit and plastic removal system that eliminates the need for grit pumps that can be equipped with any screening system and prevents plastics from entering the anaerobic digester or removing them prior to dewatering or land application.

Grit, which includes sand, soil, and other heavy inert material, can cause abrasion and wear in biogas reactors, leading to increased maintenance costs.

Moreover, the presence of plastics, including micro-plastics, not only hampers the efficiency of the digestion process but also raises concerns about raised viscosity in the biogas reactor and contamination of the final digestate.

If the depackaging/separation system from several waste streams, grinds up metals into tiny pieces, the metal contamination may also be a problem for fertilizer production and will need to be removed with the grit, this could be about 5% of the total volume of waste.

Present depackagers have high contamination rates and plastics are mainly removed after digestion, but the removal obtained by these presses often does not reach the cleanliness requirements. Drycake’s patented depackager prevents that, more information on this link.

It is suggested the process (US patent application 17/336.033) allows removing plastics before digestion to obtain an outgoing contaminant-free liquid stream.



The Drycake Depackager organic outlet and the Seditank/ Plastifloat unit are used in sequence to provide a full organic waste separation system.


Quality Design

  • Washing efficiency of the organic matter >= 90%

  • Efficiency of the grit removal >= 95%

  • Reduction of the floating matter >= 97%

  • Grit dryness efficiency 90% of dry material

  • Excellent grit capture rate

  • High reliability and long life

  • Reduced construction cost

  • Low maintenance required

  • Compact unit with a small footprint

  • Quick and easy to install

  • Possibility to customize plant

  • Configurable as a complete headworks unit

  • No odor nuisance

The main component of the Seditank is a large rectangular tank with a screw on the bottom, an inclined screw inside or outside, and a blowing mechanism to lift ups that helps sedimentation as well as an optional system to actually remove, floating material, like plastic, etc.

You load the material from the top using a conveyor or a pumping system. The material enters into the tank and using time to size the tank from the flow adequately, the density and viscosity of the material, the heavy material will drop to the bottom of the tank, this will form the sand bedding at the bottom of the unit all along the horizontal screw.

The horizontal screw takes away the material that’s accumulated at the bottom of the unit into a little storage hopper area inside the unit while the inclined screw extracts the material out of the unit. The slurry or fluid without the sand, will come out on the other side by pipe and will need to be pumped away to the biogas reactor.

As an option, there is a scrapper system which by the use of the blowing of the air takes away life-floating material. This could be residual plastic to get a cleaner organic soup.

With its ability to remove grit and plastics effectively, the Seditank paves the way for a more efficient and eco-friendly food waste recycling process.

Overall, the Seditank system’s impact goes beyond simply eliminating grit and plastics. It plays a crucial role in advancing the principles of circular economy and resource efficiency by reprocessing the separated plastics, the system promotes a closed-loop approach, reducing the demand for virgin materials and minimizing waste generation.

Through the adoption of the Seditank system, recycling, and food processing professionals can lead the way in sustainable food waste recycling, creating a positive impact on both their operations and the environment.

Investing in sustainable solutions like the Seditank demonstrates a commitment to responsible waste management and environmental stewardship. As the demand for effective food waste recycling grows, the Seditank stands as a reliable and innovative tool, empowering professionals in the industry to overcome the challenges of both grit and plastics and contributing to a greener, more sustainable future.


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