Degritter and Microplastics Removal
Seditank by Drycake

Versatile and effective de-gritting and microplastics removal

Degrit and Remove Microplastics After the Depackager.

When operating an organics digester or Biogas plant, the cleaner and less grit present in the incoming organic material, the better. Grit represents a maintenance cost to biogas plant operation. The goal is to remove  as much of the plastics, gravel and metal chucks present in the organics stream as possible prior to entering the reactor.

After depackaging and separating the organic material from containers and removed large plastics, any grit and chunks leave the depackager in the organics stream.

The next stage of processing is to degrit and clean the depackagers organics stream by removing:

  • Chunks, gravel, grit and solids
  • Fats, oil & grease
  • Small floating plastics and micro plastics


Combining the TWISTER Depackager and the SEDITANK is the most efficient way to achieve a top quality organic soup with almost no plastic

The Result:

Grit found in the waste stream exits Depackagers in the organics outlet.

Grit represents an important maintenance cost for Biogas Reactors and is undesirable in the final digestate.

The Seditank removes the grit and plastics prior to entering the Biogas Reactors.

Organics Outlet

Separated Grit

SEDITANK in Operation

1.Waste water enters the screening section where gross solids are removed from the flow, washed, compacted and dewatered.

2.The screened effluent then discharges to a hopper section where grit settling is induced. (An optional FOG removal is available to recover it for further separate treatment)

3.The settled grit is removed from the bottom of the grit channel with a horizontal grit screw.

4.An inclined shafted screw then conveys and dewaters the collected grit.

5.The grit discharges down a chute into a grit bin.

Optional configurations:


Low Pressure Air diffusers are installed to improve separation efficiency for higher viscosity, high organic matter sludge. For thinner sludge, it is not normally required.


Fat, oil and grease or small floating plastics are collected in a trap that is connected with the parallel grit channel through slots in a separating wall. These are skimmed off the water surface with a paddle scraper that is slowly pulled by a stainless steel rope. The paddle shape guarantees the removal virtually all floating matter. The skim layer is pushed over a weir into a grease hopper and then pumped for further treatment.



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