Study On The Promotion Of Anaerobic Landfill Stabilization And Methanogenesis By Compound Bacteria

The traditional anaerobic landfill waste is slow in degradation,the gas production period is lagging,the gas production rate is low,resulting in long stabilization time,low recovery rate of landfill gas,and secondary pollution,greenhouse effect and other environmental problems.The microbial complex bacteria can effectively accelerate the stabilization process of the landfill and increase the gas production rate.In this paper,the anaerobic bioreactor landfill was added to the research group to develop a composite microbial agent?bacterial agent I?and a commercially available fungicide?bacterial agent II?.The reactor without microbial agent was used as a blank control and numbered separately.For A,B,and C,the experiment lasted for*days.To study the effects of composite microbial agents on the stabilization process and methanogenesis of anaerobic landfills,and to use the methanogenesis model to analyze the promoting effect of composite microbial agents on methane production in landfills.The results show:?1?Inoculant I accelerates the biodegradation of organic waste.The content of lignocellulosic organic matter in reactor A was relatively low during the experimental period.At the end of the experiment,the lignocellulose content was*%,which was*%and*%lower than that of reactors B and C,respectively.The total organic matter content was*%,which is*%and*%lower than reactors B and C,respectively,and the sedimentation rate is*%,which is*%and*%higher than that of reactors B and C,respectively;indicating that the lignocellulosic organic matter in reactor A is rapidly degraded.The total organic matter content is rapidly reduced to accelerate the sedimentation rate of landfill waste,that is,the microbial agent I accelerates the biodegradation o f landfill waste,and is more conducive to the stabilization of the landfill.?2?The microbial agent I reduces the pollution load of the landfill leachate.At the end of the experiment,the yield of leachate in reactor A was*mL and*mL lower than that of reactors B and C,respectively.The effect of leachate reduction was obvious.At the end of the experiment,the CODcr was*mg.L^-1,which was lower than that of reactors B and C,respectively.Low*mg.L^-1,*mg.L^-1;ammonia nitrogen is*mg.L^-1,lower than reactor B,C*mg.L^-1,*mg.L^-1,respectively,the removal of CODcr and ammonia nitrogen in reactor A is better.It can be seen that the microbial agent I is more beneficial to the degradation and conversion of pollutants in the leachate,and reduces the pollution load of the leachate.?3?Inoculant I can promote the production of methane in landfills.Reactor A entered the methanogenic stage on the*day of landfill,*d and*d earlier than reactors B and C,respectively.The whole methanogenesis stage was*d,which was shortened by*d and*d respectively compared with reactors B and C.and the total amount of methanogenesis reached*mL,which was*%and*%higher than that of reactors B and C,respectively.It indicates that the microbial agent I advances the landfill into the methanogenic stage,shortens the methanogenesis cycle,increases methane production,and facilitates the collection and utilization of landfill gas.?4?The multi-regression linear model and the mathematical model of methanogenesis rate were used to analyze the promoting effect of microbial agent I on landfill methanogenesis..The regression coefficient of P<0.005 and the adjustment of R²=*indicate that the model can better verify the actual measurement results,and the overall change of environmental factors has a significant correlation with landfill methanogenesis.The sedimentation rate,total organic matter,hemicellulose and cellulose content of the environmental factors are significantly correlated with the methane production in the landfill,indicating that the change of the waste composition will have a greater impact on landfill methanogenesis.The lignin content,water content,diafiltration production,pH,VFA,CODcr and ammonia nitrogen were non-significant factors.Through the kinetic model,it can be seen that the measured methanogenic rate of reactor A is basically consistent with the predicted value,and the change rule of landfill methanogenesis in reactor A of inoculant I is verified,indicating the change of environmental factors caused by inoculant I.Promotes methane production in anaerobic bioreactor landfills.