In this study, a novel high-rate moving bed biofilm reactor (MBBR) was constructed to enhance wastewater COD bio-conversion and biopolymer recovery with a hydraulic retention time (HRT) of 1.0 h and an organic loading rate (OLR) of 4.8 kg COD·m·d. A superior specific COD reduction rate of 4.1 kg COD·m·d was obtained. The settleability analyses showed that within a settling time of 30 min, a low effluent suspended solids (SS) concentration (40.6 mg/L) with a high biomass recovery rate (83.3%) was achieved. From the recovered biomass, a remarkably higher alginate-like exopolymer (ALE) yield (274.2-385.1 mg/g VSS) was extracted as compared with seeding sludge (148.3 mg/g VSS). In addition, high protein/polysaccharide ratios of 8.5-12.4 were revealed owing to the short HRT condition. Moreover, key functional genes involving classic ALE synthesis were fully detected in such mixed-cultured bioprocess through metagenomic sequencing. Overall, this study offers a proof of concept that bio-refinery of organics into value-added biopolymers could provide a promising direction for the transformation of wastewater treatment plants from energy/resource-consuming factories to resource-recovery factories.
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