The concentration of oxalic acid in both supernatants followed an increasing trend until the 14 th day at 26.49 ± 3.43 mM (natural struvite leachate) and 74.57 ± 1.07 mM (struvite-free control).
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Solubilization of struvite and biorecovery of cerium by Aspergillus niger.
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