Technology for N recovery as enriched pelletized digestate from animal manure + biowastes with "Arbio and NPirriK-project" co-digestion + separation and backmixing process (ID:269)

Input material
animal manure, organic waste (conform Vlarema and positive list FOD)
Output product
digestate incl high N/P-dried digestate- pellets
Processing capacity
production of 90.000 tonnes digestates per year
Technology Status
Prior to market introduction
Keywords
digestion
hygenisation
backmixing
pelletising
recuperation NPK and C
Technology description

Technological elements of the recuperation proces at Arbio site are:

  • Belt filter press
  • Biology (effluent)
  • Reverse osmosis (Turbin)
  • Backmix (Dorset GP) + belt dryer + pellet press
  • Chemical air scrubbber + biobed

After separation of the digestate via a sieve belt press and further separation in a decanter (settler) the most liquid part of the liquid fraction goes to a reverse osmosis (Turbin). Reverse osmosis (RO) involves physical separation in which all particles and macromolecules are retained under pressure typically 10 to 100 bar through membranes with pore size 0,1 to 1 nanometer. After the reverse osmosis on the one hand water is obtained and on the other hand, the concentrate – an ammoniacal nitrogen containing liquid (average 10 kg NH3/1000L). The RO is a high-pressure RO with a capacity of 10.000 L water/h where calcium is removed by a patented mechanical process. Next - for management of the technical challenge which is clogging of the membranes - an extra filtration steps is built in: ultrafiltration or microfiltration -  before being pushed through the membranes at around 80 bar. The subsequent backmixing is performed through an installation which distributes the mineral concentrate (N and K) over the solid fraction just before it goes to a (belt) dryer. This allows a dried digestate (pellet) to be obtained with a much higher N/P ratio.

In the backmix, the solid fraction digestate and the wet mineral concentrate are more specifically mixed so that the mineral concentrate attaches itself to the (dry matter of the) solid fraction. The ratio between the solid fraction and the mineral concentrate is determined by speeds of jacks and pumping of the supply to the backmix. Lastly Arbio operates an exhaust air treatment system through which the air consecutively passes a chemical scrubber and a biobed – guaranteeing low maintenance, low counter-pressure and thus lower (energy) costs.

Linked Product:High NP pelletized digestate from animal manure and organic waste digestate by "Arbio and NPirriK-project" process, ID:270

Basic information

Vendor:
Country:
Belgium
Technology main category:
Physic-chemical nitrogen recovery from manure, digestate and wastewaters: separation, stripping and membrane processes
Technology subcategory:
Membrane filtration

Languages

Summary:

Technologie zur N-Gewinnung als angereichertes pelletisiertes Gärrest aus tierischer Gülle + Bioabfällen mit Co-Aufschluss + Trenn- und Rückmischungsprozess “Arbio and NPirriK-project“

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Summary:

Technologie de récupération d’azote et de phosphatesous la forme de pastilles dedigestat provenant de fumier animal et de biodéchets via une co-digestion (technologie développée lors du projet « Arbio et NPirriK »)puis une séparation et un procédé de mélange 

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Tecnología para la recuperación de N en forma de pellets enriquecidos de digestato, procedente de estiércol y otros residuos orgánicos, mediante  el proceso de codigestión, separación y retromezclado “Arbio and NPirriK-project” 

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Tecnologia per il recupero di N come digestato pellettato arricchito a partire da letame e rifiuti organici attraverso il processo di co-digestione, separazione e post-miscelazione "Arbio e NPirriK" (ID:269)

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Technologie voor N-terugwinning uit dierlijke mest + bioafval met productie van verrijkt gepelletiseerd digestaat door "Arbio en NPirriK-project"-co-vergisting en een scheidings- en terugmengproces

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Technologia odzyskiwania N jako wzbogacony granulowany poferment z obornika zwierzęcego + bioodpady z jednoczesną fermentacją „Arbio i NPirriK-projekt” + proces separacji i mieszania wstecznego

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N-kinyerés technológia az állati trágyából dúsított, pelletizált az „Arbio NPirriK-eljárás” együttes fementációval + elválasztással és visszakeveréssel

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