| Title | Phosphorus recycling from waste activated sludge using the hydrothermal platform: Recovery, solubility and phytoavailability |
|---|---|
| ID_Doc | 20471 |
| Authors | Khoury, O; Gaur, R; Zohar, M; Erel, R; Laor, Y; Posmanik, R |
| Title | Phosphorus recycling from waste activated sludge using the hydrothermal platform: Recovery, solubility and phytoavailability |
| Year | 2023 |
| Published | |
| Abstract | To address the grand challenge of increasing the sustainability of wastewater treatment plants, hydrothermal carbonization was studied as a nutrient recovery platform, transforming sludge into a valuable hydrochar. Carbonization was achieved at different temperatures (200-300 degrees C) and durations (30-120 min). The highest mass recovery (73%) was observed in the lowest temperature, while the lowest (49%) was obsereved at the highest temperature. Under all reaction conditions, phosphorus recovery values exceeded 80%, with the dominated fraction of inorganic-P in the hydrochar being HCl-extractable. Although HCl-extractable P is considered a moderately labile P fraction, P phytoavailability assays indicate that sewage sludge hydrochar is an excellent source for P, surpassing soluble P, likely due to its slow-release nature. We postulate that polyphosphates constitute a significant portion of this P pool. Overall, we emphasize the benefits of using HTC as a circular economy approach to convert sludge into a valuable hydrochar. |
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