Study On Landfill Technology Of Modified TiO₂ Leachate Eutopic Photocatalytic Bioreactor

Bioreactor landfills for nitrogen removal are attracting widespread attention due to their predominant control of ammoniacal nitrogen.And the ex-situ nitrification and in-situ denitrification is superior to in-situ nitrification and denitrification.However,the high level of nitrate from ex-situ nitrification can inhibit methane production in in-situ denitrification phase.To overcome the discordance between nitrogen removal and methane production,in this paper the anaerobic bioreactor landfill and the micro-areated aged refuse reactor are combined to devise two novel bioreactor landfills:the ex-situ simultaneous nitrification-denitrification and in-situ denitrification bioreactor landfill?SNDD?,their stabilization and mechanism are evaluated from the evolution of leachate,landfill gas,solid waste and microbial community.The main results are summarized as follows:?1?Continue to ND?eutopic nitrification in situ denitrification bioreactor landfill?,SNDD?ectopic synchronous nitrification and denitrification in situ denitrification bioreactor landfill?,re-SNDD?partial effluent leachate internal circulation Bit synchronous nitrification and denitrification in situ denitrification bioreactor landfill?,and the prediction model of the preliminary task group is compared with the actual operation.According to the preliminary model,the discharge rate of the three groups of COD was 94.14,48.48 and 40.72 mg/L respectively at 46 weeks,38 weeks and 42 weeks respectively.TN was 58 weeks,39 weeks and 41 weeks respectively Emission standards,effluent concentrations were 30.75,25.29 and29.92 mg/L,respectively.According to the test,the COD concentration was 596.16 mg/L at the 46th week,the TN concentration was 156.08 mg/L at the 58th week,the COD concentration was 468.40 mg/L at the 38th week,TN concentration was 138.32 mg/L.The COD concentration was 440.72 mg/L at 42 weeks and 142.21 mg/L at 41 weeks.The error rate of effluent COD concentration in the three groups was 0.98,0.97 and 0.96,respectively,and the error rates of effluent TN were 0.56,0.74 and 0.61,respectively.?2?FV2,FV5 and FV10 were modified according to the content of ammonium metavanadate in the primary hydrothermal stage.The secondary hydrothermal stage was divided into three groups according to the content of triethanolamine:SNV2,SNV5,SNV10.After degradation of methyl red experiment show that,SNV10 degradation of organic matter over the best case.?3?A new route to synthesize V-N co-doped titania nanocatalysts using a novel two-phase hydrothermal method was applied for enhancement of visible light absorption and electron-hole pairs separation.Results demonstrated that N implantation by second hydrothermal process?SH?did not alter V content implanted by by first hydrothermal process?FH?.The optical red shift by vanadium implantation was ascribed to the V2p state,mainly from V⁴⁺species.After SH incorporation,the substitutional N1s state,interstitial N-O state,concomitant NOx,and more V⁴⁺were responsible for the strong visible absorption of V-N-TiO2.?4?SNV10 SNDD process on the subsequent treatment effect is good,the final contaminant effluent concentration can reach the domestic waste landfill leachate discharge standards.The concentration of NH₄⁺-N was 8.5 mg/L,the concentration of NO₃^--N was 2.3mg/L,the concentration of COD was 68.2 mg/L,the concentration of TN was 11.4 mg/L...