Process for preparing BIO-available phosphate from sewage sludge

The process of using an indirectly heated rotary thermal reactor with multiple temperature zones to convert sewage sludge into bio-available phosphates addresses the economic viability issues of existing methods by enabling on-site generation and small-scale operation, while improving energy efficiency and reducing CO2 emissions.

WO2025061829A1 Publication Date: 2025-03-27AMATEQ HLDG GMBH
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Patent Information

Application Number
PCT/EP2024/076226
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-21
Filing Date
2024-09-19
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

Existing processes for converting phosphate-containing materials like sewage sludge into bio-available forms require large-scale facilities and steady supplies, making them economically unviable for small-scale operations and on-site generation.

Method used

A process utilizing an indirectly heated rotary thermal reactor with multiple temperature zones, combined with an alkali metal compound and organic material, to convert phosphate compounds with low solubility into citrate soluble phosphate compounds, enabling on-site generation and small-scale operation.

Benefits of technology

The process effectively converts low-solubility phosphate compounds into bio-available forms, improving energy efficiency, reducing CO2 emissions, and enabling efficient off-gas treatment, thus making the production of bio-available phosphates economically viable on smaller scales.

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Abstract

The claimed invention relates to a process for the treatment of a material comprising one or more phosphate compounds with low solubility in water, wherein the process comprises the steps of: i) introducing said material comprising one or more phosphate compounds, an alkali metal compound and an organic material as feed materials into a reactor, and ii) heating these feed materials at 750-1100 °C, preferably 800-1000°C, most preferably 850-1000 °C.
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