Add time:07/30/2019         Source:sciencedirect.com

A natural clinoptilolite zeolite (Z–N) and its hybrid form (Z–Mn) prepared by impregnation with hydrated manganese oxide have been evaluated for the simultaneous removal of ammonium and phosphate. The ammonium sorption capacity reported by Z–Mn was 23 ± 2 mg N–NH4+/g; while the phosphate uptake reached 5.6 ± 0.2 mg P–PO43-/g at pH 7.5. Both ammonium and phosphate uptake were slightly influenced coexisting ions commonly found in treated wastewater effluents. The Mn(II) activated zeolite (Z–Mn) improved the phosphate uptake capacity, in the pH range 7–9, by formation of surface complexes of P(V) anions with the precipitated Mn(II) hydrated oxide or by formation of mineral phases as Mn(II)–NH4–PO4 (e.g., (NH4MnPO4·H2O)) which was detected by XRD analysis. The soil bio-availability test of loaded impregnated zeolites reported higher ammonium than phosphate bio-availability. The desorption of ammonium and phosphate from the loaded manganese impregnated zeolites using 40 gL−1 NaOH solution in dynamic experiments reported higher recoveries and concentration factors of ammonium than phosphate.

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