| As a common type of gas,rment spraying exhaust is very harmful to the human body.Microbial treatment of waste gas technology research in the aqueous solution is common in the appropriate operating conditions,which have a higher removal efficiency and no secondary pollution in the treatment of low concentrations of odor emissions.From the theory,soil microbial treatment can get the same or higher effect when compared with the existing exhaust gas treatment.Therefore,it is of great theoretical and practical significance to study the degradation of automobile exhaust by using soil microbial device.In this study,benzene and toluene were used as the main characteristic materials to identify the exhaust gas from the soil.The fungi with high degradation ability of benzene and toluene are screened out from the soil.The strains with good degradation ability were identified and optimized for the degradation conditions.Spray the waste of microorganisms.In this study,a special soil microbial exhaust gas treatment device was designed to study the flow resistance characteristics of the device before and after the film.The effects of sawing wood(3:1),sawing wood: chaff: clay(1:1:2),clay: chaff(3:1)in different proportions and types of mixed packing conditions,and the degradation efficiency of toluene on various conditions under different humidity conditions.In this study,the soils are fungal fungi which were taken from the gas station and paint factory.Two strains of benzene and toluene were successfully screened for fungi Z1 and H1.Identified by the ITS method,H1 for Aspergillus more easily degraded toluene,Z1 bacteria for Aspergillus fumigatus more easily degraded benzene.The results showed that Aspergillus terreus and Aspergillus fumigatus have effective degradation ratio on toluene and benzene,respectively.The degradation rate of toluene by single factor test was 78.56% at the initial concentration of 450 mg/L and 33.96% at 4500mg/L in 8d,indicating that the bacteria has a high effect on low concentration substrate degradation.The optimum temperature for toluene degradation were as follows: 30℃,the optimum pH was 4.0.The orthogonal test was done in our research,including four factories: temperature,pH,initial benzene concentration and Tween 80 on the degradation of benzene.This results showed that the optimum conditions for the degradation of benzene were as follows: temperature of 30℃,pH of 4.0,the amount of Tween 80 of 0.5 m L/L.Under this condition,the maximum degradation rate by Aspergillus fumigatus can up to 80.4%,which was significantly higher than before acclimation.A set of soil microbial treatment system was designed in the study,and the flow resistance characteristics of the system before and after the treatment system were studied.The conclusions were as follows: when the packing height is constant,the pressure loss increases with the increase of the gas flow rate.With the growth of the biofilm,the flow of the gas is reduced and the relative air velocity increases and the pressure loss increases.The flow resistance in the air side of the filter tower was much larger than that before the film.The change of flow resistance can be used as the basis for judging the growth of microorganisms.The removal effect of the device under different toluene concentration was investigated,and the degradation effect of the filler was investigated under three different mixing conditions.The experimental results showed that the removal rate of toluene is better under these conditions.The highest degradation effect can be achieved under the condition of sawing wood and clay mixed.The maximum removal rate is nearly 90%.The removal rate of the device is related to the inlet load and removal rate of toluene,which the low load toluene inlet concentration is 100 mg/L and filler water content of is 300 g/kg.The maximum removal rate can up to 4.8 g/m3·h with the inlet concentration of 300 mg/m3 and the flow rate of 2.4 m3/h,which indicated that the mixture of sawn wood and clay have a higher degradation ability for high concentrated toluene.So we can draw a conclusion that filler moisture content played an important role on benzene removal.The general trend is that the higher water content,the higher degradation efficiency.Microbial treatment of waste gas technology research in the aqueous solution is common in the appropriate operating conditions,which have a higher removal efficiency and no secondary pollution in the treatment of low concentrations of odor emissions.From the theory,soil microbial treatment can get the same or higher effect when compared with the existing exhaust gas treatment.Therefore,it is of great theoretical and practical significance to study the degradation of automobile exhaust by using soil microbial device.In this study,benzene and toluene were used as the main characteristic materials to identify the exhaust gas from the soil.The fungi with high degradation ability of benzene and toluene are screened out from the soil.The strains with good degradation ability were identified and optimized for the degradation conditions.Spray the waste of microorganisms.In this study,a special soil microbial exhaust gas treatment device was designed to study the flow resistance characteristics of the device before and after the film.The effects of sawing wood(3:1),sawing wood: chaff: clay(1:1:2),clay: chaff(3:1)in different proportions and types of mixed packing conditions,and the degradation efficiency of toluene on various conditions under different humidity conditions.In this study,the soils are fungal fungi which were taken from the gas station and paint factory.Two strains of benzene and toluene were successfully screened for fungi Z1 and H1.Identified by the ITS method,H1 for Aspergillus more easily degraded toluene,Z1 bacteria for Aspergillus fumigatus more easily degraded benzene.The results showed that Aspergillus terreus and Aspergillus fumigatus have effective degradation ratio on toluene and benzene,respectively.The degradation rate of toluene by single factor test was 78.56% at the initial concentration of 450 mg/L and 33.96% at 4500 mg/L in 8d,indicating that the bacteria has a high effect on low concentration substrate degradation.The optimum temperature for toluene degradation were as follows: 30℃,the optimum pH was 4.0.The orthogonal test was done in our research,including four factories: temperature,pH,initial benzene concentration and Tween 80 on the degradation of benzene.This results showed that the optimum conditions for the degradation of benzene were as follows: temperature of 30℃,pH of 4.0,the amount of Tween 80 of 0.5 m L/L.Under this condition,the maximum degradation rate by Aspergillus fumigatus can up to 80.4%,which was significantly higher than before acclimation.A set of soil microbial treatment system was designed in the study,and the flow resistance characteristics of the system before and after the treatment system were studied.The conclusions were as follows: when the packing height is constant,the pressure loss increases with the increase of the gas flow rate.With the growth of the biofilm,the flow of the gas is reduced and the relative air velocity increases and the pressure loss increases.The flow resistance in the air side of the filter tower was much larger than that before the film.The change of flow resistance can be used as the basis for judging the growth of microorganisms.The removal effect of the device under different toluene concentration was investigated,and the degradation effect of the filler was investigated under three different mixing conditions.The experimental results showed that the removal rate of toluene is better under these conditions.The highest degradation effect can be achieved under the condition of sawing wood and clay mixed.The maximum removal rate is nearly 90%.The removal rate of the device is related to the inlet load and removal rate of toluene,which the low load toluene inlet concentration is 100 mg/L and filler water content of is 300 g/kg.The maximum removal rate can up to 4.8 g/m3·h with the inlet concentration of 300mg/m3 and the flow rate of 2.4 m3/h,which indicated that the mixture of sawn wood and clay have a higher degradation ability for high concentrated toluene.So we can draw a conclusion that filler moisture content played an important role on benzene removal.The general trend is that the higher water content,the higher degradation efficiency. |
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