Enhanced purification of kitchen-oil wastewater driven synergistically by surface microelectric fields and microorganisms

[Display omitted] •Surface microelectric fields (SMEF) on catalyst were formed by electrostatic force.•The formation of SMEF maximize the removal of refractory pollutants in wastewater.•The SMEF can link electron transfer between refractory pollutants and microorganisms.•The interspecific electron t...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Environment international 2023-04, Vol.174, p.107878-107878, Article 107878
Hauptverfasser: Zhang, Han, Lyu, Lai, Hu, Chun, Ren, Tong, Li, Fan, Shi, Yuhao, Han, Muen, Sun, Yingtao, Zhang, Fagen
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:[Display omitted] •Surface microelectric fields (SMEF) on catalyst were formed by electrostatic force.•The formation of SMEF maximize the removal of refractory pollutants in wastewater.•The SMEF can link electron transfer between refractory pollutants and microorganisms.•The interspecific electron transport was induced by SMEF to can speed up degradation. The stable structure and toxic effect of refractory organic pollutants in wastewater lead to the problem of high energy consumption in water treatment technology. Herein, we propose a synergistic purification of refractory wastewater driven by microorganisms and surface microelectric fields (SMEF) over a dual-reaction-center (DRC) catalyst HCLL-S8-M prepared by an in situ growth method of carbon nitride on the Cu-Al2O3 surface. Characterization techniques demonstrate the successful construction of SMEF with strong electrostatic force over HCLL-S8-M based on cation-π interactions between metal copper ions and carbon nitride rings. With the catalyst as the core filler, an innovative fixed bed bioreactor is constructed to purify the actual kitchen-oil wastewater. The removal efficiency of the wastewater even with a very low biodegradability (BOD5/COD = 0.33) can reach 60% after passing through this bioreactor. An innovative reaction mechanism is revealed for the first time that under the condition of a small amount of biodegradable organic matter, the SMEF induces the enrichment of electric active microorganisms (Desulfobulbus and Geobacter) in the wastewater, accelerates the interspecies electron transfer of intertrophic metabolism with the biodegradable bacteria through the extracellular electron transfer mechanism such as cytochrome C and self-secreted electron shuttle. The electrons of the refractory organic pollutants adsorbed on the surface of the catalyst are delocalized by the SMEF, which can be directly utilized by microorganisms through EPS conduction. The SMEF generated by electron polarization can maximize the utilization of pollutants and microorganisms in wastewater and further enhance degradation without adding any external energy, which is of great significance to the development of water self-purification technology.
ISSN:0160-4120
1873-6750
DOI:10.1016/j.envint.2023.107878