Technology for P recovery as calcium-phosphate starting from sewage sludge ashes with "Ash2Phos" process (ID:317)

Input material
Sewage sludge ashes
Output product
Calcium phosphate
Processing capacity
30000 t ash/y
Technology Status
Advanced development stage
Keywords
sewage sludge ash
clean phosphorus products
chemical P recovery
Technology description

EasyMining is focused on creating circular material flows from waste. Via the food cycle, phosphorus ends up in sewage sludge. Incineration of this sludge is today mainly used as a method to reduce the amount of waste to land fill, or destruction if the sludge quality is too low for other uses. The phosphorus content of ash from incinerated sewage sludge is high, and through this unique patented process, we are able to extract clean commercial phosphorus products from the ash. The Ash2Phos process can transform the sludge ash into raw material for phosphorus extraction and thereby be a part of a circular solution for phosphorus management. The process consists of 3 sequential steps: a first acidic step, a second alkaline step (where intermediate products are produced), and finally a conversion step where the intermediates are processed into final products.The process consists of several successive chemical reactions undertaken at room temperature (though one process step may benefit from a temperature of 40°C). There is no need for pressurized vessels or for exceptional materials to be used for the equipment. The mass balance of the process is favourable, since all input chemicals become part of the products.

Pilots are running in Sweden (Helsingborg and Uppsala, 600 and 50 kg ash per day). Permit application is ongoing for the full scale plant in Sweden (30000 ton ash per year) and Germany (Chem Park Bitterfeld-Wolfen, 60000-90000 ton ash per year).

Basic information

Vendor:
Country:
Germany
Technology main category:
Phosphorus precipitation from liquid manure, waste water and drain water
Technology subcategory:
Phosphorus precipitation from wastewater/sludge

Languages

Summary:

Technologie zur P-Rückgewinnung als Calciumphosphat ausgehend von Klärschlammasche nach dem „Ash2Phos“ -Verfahren

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Technologie de récupération de Phosphate sous la forme de Calcium de phosphate à partir de cendres de boues d'épuration via un processus « Ash2Phos »

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Tecnología para la recuperación de P como fosfato cálcico partiendo de las cenizas de fango procedente de aguas residuales mediante el proceso “Ash2Phos”

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Tecnologia per il recupero di P come fosfato di calcio a partire dalle ceneri dei fanghi di depurazione mediante il processo "Ash2Phos"

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Technologie voor P-terugwinning uit zuiveringsslibas met productie van calciumfosfaat d.m.v. het "Ash2Phos"-proces

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Technologia odzyskiwania P w postaci fosforanu wapnia wychodzącego z popiołów osadów ściekowych w procesie „Ash2Phos”

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Szennyvíziszap-hamuból történő kalcium-foszfát P kinyerési technológia

„Ash2Phos” eljárással

Abstract:

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