“…The three types of hydrogels namely, HB, HC, and HBC, were synthetized in our experiment. All hydrogels were synthesized following the procedure previously reported [ 42 ], and just adding inoculum (consortium microalgae-bacteria), AC (size < 45 μm, HYCEL), or both. Briefly, hydrogels were produced from a solution polyvinyl alcohol (PVA, (C 4 H 6 O 2 ) n , Kuraray), sodium alginate (SA, (C 6 H 7 NaO 6 ) n , Sigma Aldrich) and a fraction of biomass in deionized water (DI).…”