| 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 |
| DOI |
10.1021/acs.est.3c02843 |
| 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. |
| Author Keywords |
phosphorus recovery; digestate; electrochemicalsystem; phosphorus leaching; sustainability |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001018088200001 |
| WoS Category |
Engineering, Environmental; Environmental Sciences |
| Research Area |
Engineering; Environmental Sciences & Ecology |
| PDF |
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