Technology for N recovery as dried digestate and ammonia sulphate from solid fraction digestate with "Biogas Bree" chemical scrubbing of exhaust air during drying process (ID:273)

  • 0
  • 1
Input material
animal manure, organic waste (conform Vlarema and positive list FOD), energy maize
Output product
post-treated digestates including dried digestate and ammonia sulphate
Processing capacity
production of solid fraction (5.000 t/y) – non animal manure status –, liquid fraction digestate (45.000 t/y) – non animal manure status –, dried digestate (1.500 t/y) – manure status –, ammonia sulphate (200-500 t/y)
Technology Status
Available on the market
Keywords
digestion
hygienisation
nutrient recuperation
air scrubber
ammonia sulphate
Technology description

 Technological elements of the recuperation proces at Biogas Bree site are:

  • Dryer  
  • Chemical air scrubber  
  • Biobed  
  • Silo (for ammonia sulphate)   
  • For application of ammonia sulphate (UNIR project)
    • Sprayer system (from contract labourer) was transformed to drag hose system  
    • Spoked wheel fertiliser

The digestate coming from the manure-input line is submitted to a drying process (with heat from a biogas fueled CHP) more particularly a belt dryer (Dorset) (cfr
https://www.vlaco.be/sites/default/files/generated/files/page/technische-fiche-banddroger-10-11-16.pdf). The end product is dried digestate. Throughout 2019-2020 a new dryer, type fluidised bed dryer will be installed for greater capacity (3,5 MWth/h or 32.000 ton liquid fraction/y) (https://www.vlaco.be/sites/default/files/generated/files/page/technische-fiche-wervelbeddroger-10-11-2016.pdf). The exhaust air is saturated with ammonia which is being captured by a chemical air scrubber. In a chemical scrubber, acid is added to the washing water to remove the ammonia and a part of the odour compounds from the exhaust air. Water, acidified with sulphuric acid (96 % or 98 %), flows continuously over the filter package. This humidifies the filter. The acidic  ashing water reacts with the ammonia in the air. A salt (ammonium sulphate) is formed. That salt remains in the washing water which means that the outgoing air contains less  ammonia.

Per kilogram  recuperated  ammonia  1,5  litres  of  sulphuric  acid  is  needed.  When  the  washing  water  is saturated with ammonia sulphate, no more ammonia can be converted and the ammonia sulphate-loaded washing water is discharged (making room for new water+acid to form new washing water). About 30 litres of ammonia sulphate is produced/discharged per kilogram of ammonia that is recuperated from the exhaust air. The specific model Biogas Bree handles was a modified scrubber with  before  and after the acidic water washing respectively  a dust washer and an  additional air washer (de-acidifying air).

Linked Product: Ammonium sulphate from digestate by "Biogas Bree" process, ID:274

 

Basic information

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

Languages

Summary:

Technologie zur N-Rückgewinnung als getrockneter Gärrest und Ammoniumsulfat aus der fester Gärreste-Fraktion mit chemischem Waschen der Abluft mit “Biogas Bree“ aus dem Abluftstrom während des Trocknungsprozesses

Abstract:

Unterlagen:

Unterlagen:

Summary:

Technologie de récupération d’azote sous la forme de digestat séché etde sulfate d’ammonium à partir de la fraction solide dedigestat avec un lavage chimique de l'air d'échappement « Biogas Bree » au cours du processus de séchage

Abstract:

Documents:

Documents:

Summary:

Tecnología para la recuperación de N en forma de digestato seco y sulfato de amonio procedente de la fracción sólida del digestato mediante lavado químico de los gases de escape durante el proceso de secado “Biogas Bree” 

Abstract:

Documentos:

Documentos:

Summary:

Tecnologia per il recupero di N come digestato essiccato e solfato ammonico partendo da digestato solido mediante lavaggio chimico dell'aria di scarico durante il processo di essiccazione "Biogas Bree" 

Abstract:

Documenti:

Documenti:

Summary:

Technologie voor N-terugwinning uit vaste fractie digestaat met productie van gedroogd digestaat en ammoniumsulfaat d.m.v. "Biogas Bree" chemische reiniging van afvoerlucht tijdens het droogproces 

Abstract:

Documenten:

Documenten:

Summary:

Technologia odzysku N w postaci wysuszonego pofermentu i siarczanu amoniaku z frakcji stałej frakcji z chemicznym oczyszczaniem powietrza „Biogas Bree” podczas procesu suszenia

Abstract:

Dokumenty:

Dokumenty:

Summary:

N kinyerési technológia szárított fermentum és ammónia-szulfátok formájában a szilárd frakciókból készült extrakcióval a „Biogas Bree” szárítási folyamat során (ID: 273)

Abstract:

Dokumentumok:

Dokumentumok:

Find out more

Practice Abstract:
Info sheet:
Video: