Method for Preparing N-P Compound Fertilizer from Incinerated Sewage Sludge Ash (ISSA)
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United States of America Patent
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Issued Date -
Dec 14, 2023
app pub date -
Jun 6, 2023
filing date -
Jun 8, 2022
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Abstract
The present disclosure provides a method for preparing an N-P compound fertilizer from incinerated sewage sludge ash (ISSA), and relates to the technical field of compound fertilizer production. In the present disclosure, the ISSA is used as a main raw material, and a phosphorus-rich supernatant is obtained using high-concentration nitric acid at a low liquid-to-solid ratio. The phosphorus-rich supernatant and aqueous ammonia are mixed to obtain a white precipitate. The white precipitate is dried and pulverized to obtain a high-grade N-P compound fertilizer. The present disclosure realizes the resource utilization of excess sludge in sewage treatment plants.
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