Technology for N&P recovery as liquid or dried digestates with "Agrogas" separation, drying, membrane filtration and/or reverse osmosis combined with post-treatment system (ID:263)

Input material
animal manure, organic waste (conform Vlarema and positive list FOD), energy maize
Output product
digestate post-treated digestates including liquid fraction and dried digestate
Processing capacity
production of 60.000 t/y liquid fraction digestate (including concentrated and/or, thickened effluent), 3.000 t/y dried digestate, and 1.000 à 2.000 t/y digestate and/or solid fraction digestate
Technology Status
Available on the market
Keywords
green energy
hygienisation
separation
drying
recuperation NPK and C
Technology description

Besides 4 digesters, storage spaces, etc the main technological elements of the recuperation/post-treatment processes at Agrogas site are:

  • sieve belt press 
  • drying installation
  • biology unit
  • Membrane Bioreactor Unit
  • Reverse Osmosis unit

Anaerobic digestion (AD) is a well-established method for the treatment of organic (waste) streams and the generation of biogas for the production of renewable energy. Besides manure and organic industrial (food) waste streams also energy crops are routinely processed through a mesophile and/or thermophile digestion process. The anaerobic digestion process is a natural process in which various microorganisms break down biodegradable organic material under anaerobic conditions and convert it (10-15%) into biogas – a mixture of carbon dioxide, methane and limited amounts of other components – and (85-90%) into digestate. Compared to the initial feedstock the digestate is homogenised, mostly hygienised (cfr EC1069/2009 (animal by-products)), has a higher NRV (non return valve, efficiency) due to a parcial transfer of the organically bound N to ammoniacal nitrogen.

Agrogas has two separate digestion and post-treatment lines: one purely vegetal proces line and one animal by-products/manure process line.

In the vegetal line: the (two times fermented) digestate is separated via a screw press into a liquid (or ‘thin’) fraction. The thin fraction of the vegetal line can be disposed of usually on Flemish agricultural soils – sometimes mixed with the hygienised in fraction of the animal process line. (Both types of) the thin fraction(s) can – depending on the specific needs and wishes of the agricultural and horticultural users under go further processing by Agrogas, namely a biologic water treatment with membrane filtration (Membrane Bioreactor (MBR)) or reverse osmosis (RO). This MBR permeate or RO concentrate can undergo further evaporation in the thickener.

In the animal line: a digestate is made from manure, animal by-products (cat III), gastrointestinal contents (cat II) and additionally vegetal organic residues and/or energy crops. Given this composition, the final product can only be applied if it complies with regulation 1069/2009. For this purpose the digestate is always post-fermented themophilic  (>55°C) in a thermophilic post-digester. In a further step the digestate is separated in a liquid (‘thin’) and a solid (‘thick’) fraction via a sieve belt press. The thick fraction of the animal fermentation line is stored in a separate loading area for drying or for further external processing. The thin fraction of the hygienized digestate with manure is mostly further treated at the biological water treatment plant with membrane filtration (MBR). The permeate that is released during this process can either be removed or further evaporated to thickened permeate with manure.

In the post-treatment polymers are used for the screen (or ‘sieve’) belt press and iron chloride, antifoam and carbon source for biological water treatment.

Linked Product: Liquid and solid (dried) fraction digestate from manure and energy maize by "Agrogas" process, ID 264

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

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Summary:

Technologie zur N & P-Rückgewinnung als flüssiger oder getrockneter Gärrest mit Agrogas-Trennung, Trocknung, Membranfiltration und/oder Umkehrosmose in Kombination mit einem Nachbehandlungssystem

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Technologia odzyskiwania N&P w postaci płynnych lub suszonych produktów przefermentowanych z separacją „Agrogas”, suszeniem, filtracją membranową i / lub odwróconą osmozą w połączeniu z systemem oczyszczania końcowego

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