Energetic utilization of corn stalk and elimination of methyl orange in ECMO-like integrated reactor: Co-occurrence of anaerobic digestion and aerobic treatment

For the simultaneous energetic utilization of corn stalk and azo-dye contaminated wastewater, an ECMO-like integrated reactor was come up to achieve the biogas production and azo-dye degradation during anaerobic digestion (AD). Methyl orange (MO) was selected as the model compound for azo-dye. The E...

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Bibliographic Details
Published in:Journal of environmental management 2024-06, Vol.360, p.121139-121139, Article 121139
Main Authors: Fu, Shanfei, Xie, Zhong, Feng, Kai, Zou, Hua, Guo, Rongbo, Lian, Shujuan
Format: Article
Language:English
Subjects:
Aerobic removal
Anaerobic digestion
Anaerobiosis
Azo Compounds
Azo dye
Biodegradation, Environmental
Biofuels
Bioreactors
Corn stalk
ECMO-Like reactor
Methane - metabolism
Waste Disposal, Fluid - methods
Wastewater - chemistry
Zea mays
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Summary:For the simultaneous energetic utilization of corn stalk and azo-dye contaminated wastewater, an ECMO-like integrated reactor was come up to achieve the biogas production and azo-dye degradation during anaerobic digestion (AD). Methyl orange (MO) was selected as the model compound for azo-dye. The ECMO-like reactor included AD main reactor with a spray device and solid-liquid separation components, integrated with an aeration reactor for biogas slurry. Methane yields of corn stalks (100.82 mL/g VS) were highest in the ECMO-like reactor, compared with reactors without aeration. As a stable metabolite, 4-aminobenzenesulfonic acid (4-ABA) was detected in AD, while it was assumed that the metabolites can be further transformed in the ECMO-like reactor (R3), due to the 4-ABA removal efficiency as 92.87 % after 35 days’ digestion. Class Alphaproteobacteria and Clostridia were assumed as functional microbes responding to aeration. Overall, this ECMO-like integrated reactor provided a novel biotechnology strategy for agricultural and azo dye waste treatment. [Display omitted] •An ECMO-like reactor was developed for the degradation of recalcitrant compounds.•Methyl orange loaded corn straw was utilized as substrate for biogas reactor.•Azo bond reductase can degrade methyl orange to 4-ABA in anaerobic digestion.•The further transformation of 4-ABA only could take place in ECMO-like reactor.
ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2024.121139