| Title | Demonstration of ion exchange technology for phosphorus removal and recovery from municipal wastewater |
|---|---|
| ID_Doc | 27582 |
| Authors | Guida, S; Rubertelli, G; Jefferson, B; Soares, A |
| Title | Demonstration of ion exchange technology for phosphorus removal and recovery from municipal wastewater |
| Year | 2021 |
| Published | |
| Abstract | Orthophosphate (PO4-P) removal and recovery from municipal wastewater were investigated in a 10 m(3)/day hybrid anion exchanger (HAIX) demonstration plant. To date, HAIX resins have been investigated for PO4-P removal at laboratory scale with promising results but there is a need to investigate the application of the technology at larger scale, over extended operation whilst establishing an efficient regenerant management solution. The HAIX removed an average of 6 mg PO4-P/L to > 0.3 mg PO4-P/L, within 430 bed volumes, with a capacity of 4.1 mg PO4-P/g resin. To manage the regenerant (NaOH 2%) efficiently, this was reused up to 8 times, reaching 785 mg PO4-P/L, but the adsorption capacity was compromised, and it decreased to 1.5 mg PO4-P/g resin. By adding calcium hydroxide to the saturated NaOH, 95% of the PO4-P was recovered as hydroxy-apatite, and at the same time the regeneration effectiveness was re-established, as < 0.3 mg PO4-P/L was reached again in the effluent. The treated NaOH was reused as regenerant solution, ensuring high effluent quality of < 0.2 mg PO4-P/L. This study confirmed the capability of HAIX technology to remove and recover PO4-P from wastewater offering a solution which ensures both a high effluent quality and a circular economy approach. |
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