| Studies have shown that compared with other biological denitrification processes,simultaneous nitrification and denitrification?SND?process can effectively reduce N2O production while biological activated carbon?BAC?has large specific surface area and internal pore is conducive to the adhesion growth of microorganisms and the formation of different dissolved oxygen environments,Theoretically,it is possible for SND denitrification in theory.Therefore,this experiment takes sequence batch activated sludge reactor?SBR?and SBR reactor with BAC as the research objects,through the treatment of wastewater with different carbon sources,different C/N ratio and different wastewater,compared the pollutant removal efficiency and N2O production,discussed the mechanism of BAC influencing N2O production,which provided theoretical support for N2O emission reduction in wastewater denitrification process.?1?In investigating the effect of BAC on N2O production in SND denitrification of wastewater with different carbon sources,the amount of N2O produced by the SBR reactor with BAC is lower than that of the SBR reactor.The amount of N2O produced by a single operation cycle of the SBR reactor with BAC is 2.15×10-1 mg less than that of the SBR reactor when methanol as a carbon source,and the amount of N2O producted by a single operation cycle of the SBR reactor with BAC is 6.61×10-1 mg less than that of the SBR reactor when the carbon source is sodium acetate,and when the tert-butanol is a carbon source,the amount of N2O produced by the SBR reactor with BAC is reduced 6.88×10-1 mg which compared with the SBR reactor,and the removal efficiency of pollutants is also good.When methanol is used as carbon sources,the removal rate of NH4+-N is 99.25%,the removal rate of COD is 88.84%,and the removal rate of NH4+-N is 98.68%,and the removal rate of COD is 93.25%when sodium acetate is used as carbon source,and the removal rate of NH4+-N is 93.82%,and the removal rate of COD is 60.78%when tert-butanol is used as carbon source.The influence of BAC on N2O production and the removal efficiency of pollutants of wastewater prepared from different carbon sources:tert-butanol>sodium acetate>methanol,it is indicated that the addition of BAC in the SBR process can effectively control the production of N2O in the denitrification process of refractory wastewater.?2?It is verified by experiments that the denitrification methods in the SBR reactor with BAC added to the same carbon source with C/N ratio of 3,6 and 9 is SND denitrification.When the C/N ratio is 3 the value of ESNDis 53.67,when the C/N ratio is 6 the value of ESNDis 54.05,and the value of ESNDis 64.99when the the C/N ratio is 9.The N2O concentration is lower than that of the SBR reactor,and the pollutant removal effect is better than that of the SBR reactor.?3?In the study of SND denitrification of domestic sewage and landfill leachate,the amount of N2O in SBR reactor with BAC is significantly lower than that of SBR reactor.In the process of domestic sewage treatment,the amount of N2O produced by a single operation cycle of SBR reactor with BAC is 6.63 mg less than that of the SBR reactor,and when the landfill leachate is treated,the amount of N2O produced by the SBR reactor with BAC is 8.98×10-1 mg less than that of the SBR reactor,it is indicated that the influence of BAC on the production of N2O in wastewater is:domestic sewage>landfill leachate. |
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