Technology for P recovery as biomass ashes from low plant available phosphorus compounds with "AshDec®" thermochemical process (ID398)

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Input material
Sewage sludge ash/sweage sludge (optional)
Output product
Calcined ash with 12-25% P2O5
Processing capacity
15.000 t per year
Technology Status
Advanced development stage
Keywords
sewage sludge ash
thermochemical conversion
plant available phosphorus
Technology description

AshDec® is a thermochemical process designed to convert the low plant available phosphorus compound in the ash (Ca3(PO4)2) to the highly plant available compound CaNaPO4 while reducing the heavy metal content.The core process encompasses feeding ash to a rotary kiln where it is mixed with sodium compounds (e.g. Na2CO3) and a reducing agent, preferably sewage sludge. The material is treated at around 900 °C for 15-20 min. Sodium ions replace calcium ions in the phosphates and formcitrate-soluble CaNaPO4 compounds. Simultaneously, sodiumreacts with silicon dioxide present in the ash and forms sodiumsilicates.As reducing agent, preferably sewage sludge is added to reduce theoxidized heavy metals. A noticeable highamount of heavy metalsin their elemental form evaporate at the prevalent temperatures.

Linked product: Calcium-Sodium-Phosphate from sewage sludge ash conversion with the "AshDec®" process (ID 397)

 

Basic information

Vendor:
  • Name: Outotec GmbH & Co. KG
  • Contact: Tanja Schaaf, Julian Ulbrich
  • Vendor website
    Country:
    Germany
    Technology main category:
    Thermochemical nutrient recovery
    Technology subcategory:
    Oxidative thermochemical Phosphorus recovery

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    Summary:

    Technologie zur P-Rückgewinnung als Biomasseasche aus gering pflanzenverfügbaren Phosphorverbindungen mit dem thermochemischen Verfahren "AshDec®" 

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    P-visszanyerési technológia biomassza hamu formájában alacsony növények számára felvehető foszfor tartalmú anyagokból "AshDec®" hőkémiai eljárással 

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