Assessment of the performance of an anoxic-aerobic microalgal-bacterial system treating digestate.

摘要: Abstract The performance of an anoxic-aerobic microalgal-bacterial system treating synthetic food waste digestate at 10 days hydraulic retention time via nitrification-denitrification under increasing concentrations 25%, 50%, and 100% (v/v) was assessed during Stages I, II III, respectively. supported adequate treatment without external CO2 supplementation since sufficient inorganic carbon in the available for autotrophic growth. High steady-state Total Organic Carbon (TOC) Nitrogen (TN) removal efficiencies 85–96% 73–84% were achieved I II. Similarly, PO 4 3 − -P removals 81 ± 15% 58 ± 4% recorded these stages. During Stage average influent 815 ± 35 mg TOC·L−1, 610 ± 23 mg TN·L−1, 46 ± 11 mg -P·L−1 induced O2 limiting conditions, resulting TOC, TN 85 ± 3%, 73 ± 3%, 28 ± 16%, Digestate 25% 50% favored mechanisms, whereas undiluted resulted higher ammonia volatilization hampered nitrification-denitrification. In II, microalgal community dominated by Chlorella vulgaris Cryptomonas sp., Pseudoanabaena sp. more abundant III. Illumina sequencing revealed presence nitrogen transforming bacteria, with dominances genera Gemmata, Azospirillum, Psychrobacter Finally, high settleability biomass (98% suspended solids settler) C (42%), N (7%), P (0.2%), S (0.4%) contents recovered confirmed its potential agricultural applications, contributing to a closed-cycle management waste.