| Title | Phosphorus Recovery from Whole Digestate through Electrochemical Leaching and Precipitation |
|---|---|
| ID_Doc | 9739 |
| Authors | Wang, ZX; Anand, D; He, Z |
| Title | Phosphorus Recovery from Whole Digestate through Electrochemical Leaching and Precipitation |
| Year | 2023 |
| Published | Environmental Science & Technology, 57.0, 27 |
| Abstract | Twodifferent environments in an electrochemical processallow simultaneous leaching and recovery of phosphorus from wholedigestate. Phosphorus (P) recovery from biosolids can play an importantrolein a circular economy. Herein, an electrochemical phosphorus recoverycell (EPRC) was proposed and examined to recover P from municipalwhole digestate via simultaneous leaching and precipitation.The anode of the EPRC released P as aqueous PO4 (3-)-P through acidification, achieving the highest leaching efficiencyof 93.3% under a current density of 30 A m(-2). Whenthe leached P solution was treated in the cathode, native metals includingCa and Fe facilitated electrochemically mediated PO4 (3-)-P precipitation (EMP) and precipitated & SIM;99%of the leached P in the cathode chamber. Around 54.3-78.7%of total P existed in two harvestable forms: suspended solids in thecathode effluent and immobilized P in the cathode chamber. The solidproducts contained 28.42-33.51% of P2O5, comparable to the high-grade phosphate rock. Higher current densitiesreduced cathode scaling and resulted in a lower content of heavy metalsin the solid products. An acidic solution was reused three times andeffectively maintained cathode performance during a 42-cycle operation,achieving a consistent P recovery efficiency of nearly 80%. Thoseresults have demonstrated the feasibility of the EPRC for recoveringP from P-rich solid wastes. |
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