Aerobic post-treatment of effluent from anaerobic reactors fed with residues from 1G and 2G sugarcane biorefineries.
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2022
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This study aimed to evaluate an activated sludge system as a post-treatment
step of anaerobic effluents from the co-digestion of sugarcane vinasse and
hemicelluloses hydrolysate. The system consisted, initially, of a two-stage
anaerobic system followed by a continuously fed activated sludge, all in bench
scale. After adaptation of aerobic microorganisms to effluent conditions, the
anaerobic digestion was conducted in a single-stage anaerobic reactor, increasing the influent organic loading rate (OLR) of activated sludge from 0.73 to an
average of 2.36 gCOD/L day. Under optimal conditions (12-h hydraulic retention time [HRT]), a 62 ± 9% efficiency was observed on the aerobic post-treatment, resulting in effluent chemical oxygen demand (COD) of 414.3 ± 95 mg/
L. Overall efficiency of the combined system (anaerobic + aerobic) averaged
88 ± 3%. Influent and effluent characteristics were then analyzed by Folin-Ciocalteau method, UV–Vis spectrophotometry, and gas chromatography–mass
spectrometry (GC–MS) for identification of potentially toxic and recalcitrant
compounds. Compounds that absorb light within the visible spectra were well
removed by the combined treatment system. Most compounds identified by
GC–MS in the influent were completely removed by aerobic microorganisms.
Saturated fatty acids such as adipic acid, hexadecanoic acid, and octadecanoic
acid were observed in the final effluent, as well as other potentially toxic compounds such as stigmasterol, di-isobutyl phthalate, and benzene. Activated
sludge proved to be an efficient post-treatment for anaerobic co-digestion, able
to cope with changes of anaerobic effluent quality and providing a final effluent of stable organic load. However, phenol removal was not efficient and further studies could be performed to optimize its degradation.
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Activated sludge, Aerobic post-treatment, Recalcitrant, Spectroscopy
Citação
PROCOPIO, P. F.; AQUINO, S. F. de; HERRERA ADARME, O. F. Aerobic post-treatment of effluent from anaerobic reactors fed with residues from 1G and 2G sugarcane biorefineries. Water Environment Research, v. 94, n. 8, p. e10771, ago. 2022. Disponível em: <https://onlinelibrary.wiley.com/doi/full/10.1002/wer.10771>. Acesso em: 01 ago. 2023.