Effect of Biochar on the Degradation of Complex Dye Wastewater by Aeromonas hydrophila
The activity of bacteria is the key to effective degradation for complex dye wastewater.In this study,dye wastewater degrading bacteria were isolated and domesticated,Their morphological characteristics and phylogenetic evolution were analysed and identified.A composite system was constructed by biochar and Fe2O3/biochar(Fe-BC)with the bacteria to study the effects of biochar and Fe-BC on the bacteria during the degradation process.The results showed that the degrading bacteria was Aeromonas hydrophila,and the degradation and decolourisation rates increased by 18%and 75%in the biochar-bacteria and Fe-BC-bacteria systems,respectively.The degradation and decolourisation process followed the first-order degradation kinetic model.In the Fe-BC-bacteria system,the metabolism of bacterial cells and material transfer between cells were promoted,the content of elements involved in metabolism such as N,P,S,Ca,Na and Fe were increased.Fe2+ was involved in the process of complex organic matter and the degradation products mainly included N-2-(3,4-dihydroxyphenyl)-ethylmethylamine,2,3-dihydro-1,3-diox-1H-isoindole-5-carboxylic acid(C =O)and methyl methoxyacetate(C-O).Biochar and Fe-BC could enhance the biological activity of Aeromonas hydrophila and completed the degradation and decolourisation of complex dye wastewater.
iron oxidebiocharbacteriadye waste waterdegradation
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