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

Input material
Sewage sludge ash, sewage sludge
Nutrient content info

(N-P-K %): 0% N – (15-25)% P2O5 – 1% K2O

Status
Advanced development stage
Application dose
: Depending on the P-nutrient needs of thecrop and the P-nutrient status of the soil.
Type of farming
conventional
Keywords
ash
thermochemical conversion
mineral fertiliser
high plant available P
Product 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 and a reducing agent, preferably sewage sludge. The material istreated at around 900 °C for 15-20 min. Sodium ions replace calcium ions in the phosphates and form the AshDec®-product: Citrate-soluble CaNaPO4compounds. 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 high amount of heavy metalsin their elemental form evaporate at the prevalent temperatures.

Linked technology: Technology for P recovery as biomass ashes from low plant available phosphorus compounds with "AshDec®" thermochemical process (ID 398)

Basic information

Vendor:
  • Name: Outotec GmbH & Co. KG
  • Contact: Tanja Schaaf, Julian Ulbrich
  • Vendor website
    Country:
    Germany
    Product main category:
    Ash
    Product subcategory:
    Ash

    Languages

    Summary:

    Calcium-Natriumphosphat aus der Umwandlung von Klärschlammasche nach dem "AshDec®" -Verfahren 

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    Calcium-Sodium-Phosphate à partir de cendres de boues d’épuration via le procédé « AshDec® »

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    Fosfato de calcio y sodio procedente de la conversión en cenizas de fangos de aguas residuales mediante el proceso "AshDec®"

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    Calcio-Sodio-Fosfato prodotto a partire dalla conversione delle ceneri di fanghi di depurazione con il processo “AshDec®”

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    Calcium-Natrium-Fosfaat uit as van waterzuiveringsslib, bekomen via “AshDec®" proces

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    Fosforan sodowo-wapniowy z konwersji popiołów z osadów ściekowych w procesie „AshDec®” 

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    Kalcium-nátrium-foszfát előllítása szennyvíziszap-hamuból "AshDec®" eljárással 

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