Biodegradability enhancement of phenolic wastewater using hydrothermal pretreatment

[Display omitted] •The biodegradability was improved using hydrothermal pretreatment (HTP)•250 °C was the dividing point between hydrothermal gasification and amino release.•97.7 % of the volatile phenol removal achieved during 250 °C HTP combined process.•HTP facilitated Chloroflexi colonies and re...

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Bibliographic Details
Published in:Bioresource technology 2023-01, Vol.367, p.128199-128199, Article 128199
Main Authors: Zhang, Huiwen, Ling, Zhang, Ma, Jiangya, Nie, Yong
Format: Article
Language:English
Subjects:
activated sludge
aeration
B/C ratio
biodegradability
catechol
Chloroflexi
Coking wastewater
Functional microorganisms
gasification
Hydrothermal pretreatment
oxidation
oxygenases
temperature
Volatile phenol
wastewater
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Summary:[Display omitted] •The biodegradability was improved using hydrothermal pretreatment (HTP)•250 °C was the dividing point between hydrothermal gasification and amino release.•97.7 % of the volatile phenol removal achieved during 250 °C HTP combined process.•HTP facilitated Chloroflexi colonies and relevant functional genes in aerobic section. A novel hydrothermal pretreatment was applied for the biochemical treatment of phenolic wastewater with high concentrations of phenolic substances. The results demonstrated that 250 °C was the reaction temperature dividing point for complete oxidation, hydrothermal gasification, and amino release from carbonaceous organics in phenolic wastewater. Before the dividing point reached, some of the large molecules were hydrolyzed into small molecules of volatile phenolic substances that were easily adsorbed by the activated sludge. After the integrated hydrothermal pretreatment and anaerobic/aeration process, the removal rate of volatile phenolswas respectively reached by 97 % and 88 % with hydrothermal temperature of 250 °C and without pretreatment. Functional microorganisms (i.e., Chloroflexi) responsible for aromatic compounds degradation were enriched, thus the dioxygenases, dehydrogenase reactions, and meta-cleavage of catechol were enhanced. This work provided an innovative approach to remove phenolic substances from phenolic wastewater, and in-depth understandings of microbial responses in biochemical systems.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2022.128199