Abstract: Aqueous fluid polluted with phosphate contaminants is mixed with or passed through an adsorbent material selected from: (i) particles of oxides or hydroxides of transition metals, aluminum oxides or hydroxides, TiO2, or mixtures thereof, or (ii) particles of activated carbon, activated alumina, aluminum oxide, activated TiO2, TiO2, mineral clay, zeolite, or an ion exchanger loaded with nanoparticles of oxides or hydroxides of transition metals, aluminum oxides or hydroxides or TiO2, or mixtures thereof, to yield aqueous fluid purified from phosphate. The adsorbent material is further regenerated by increasing the pH of the adsorbent sludge, concentrated phosphate solution or a phosphate crystal slurry is recovered as well.