Typical Organic Sulfur (VoSCs) Degrading Strain Screening,Metabolism And Synergistic With Vocs Purification

Recently,the biodegradation of volatile organic sulfur compounds?VOSCs?has become a burgeoning field,with a growing focus on the reduction of VOSCs.The reduction of VOSCs encompasses both organic emission control and odor control.The threshold of DMS is 0.0006 to0.004 ppm,and it would be possible to threaten public healthy when the limitation beyond 0.05?L·h^-1.Herein,Alcaligenes sp.SY1 was isolated from active sludge?Genebank NO.KP162176,CCTCC M2014619?and found to utilize dimethyl sulfide?DMS?as a growth substrate in MSM.Response surface methodology?RSM?analysis was applied to optimize the incubation conditions.The following conditions for optimal degradation were identified:temperature,27.03oC,pH,7.80,inoculum salinity,0.84%,and initial DMS concentration 1585.39?M.Under these conditions,approximately 99%of the DMS was degraded within 30 h of incubation.Two metabolic compounds were detected and identified by gas chromatography-mass spectrometry?GC-MS?:dimethyl disulfide?DMDS?and dimethyl trisulfide?DMTS?.The DMS degradation kinetics for different concentrations were evaluated by using the Haldane-Andrews model and the pseudo first–order model.The maximum specific growth rate and degradation rate of Alcaligenes sp.SY1 were 0.17 h^-1 and 0.63 gs·gx^-1 h^-1,respectively.A possible degradation pathway is proposed,and the results suggest that Alcaligenes sp.SY1 has the potential to control odor emissions under aerobic conditions.In this study,a biotrickling filter?BTF?co-treatment characteristics of single and ternary mixture gas of dimethyl sulfide?DMS?,propanethiol and toluene seeded with Alcaligenes sp.SY1,pseudomonas putida S-1 and recovery toluene degradation strain were evaluated.The effects of inlet loading rate?ILR?and empty bed retention time?EBRT?on eliminate capacity?EC?and removal efficiency?RE?were tested under different EBRTs which were varied from 56s to 28s and 20s through phase?to phase?.Diffusion-reaction constraint was observed corresponding with increasing ILR.Michelis-Menten?M-M?kinetic model was applied to modify the behavior of BTF.The maximum removal rate(r_max)was calculated as 256.41 g·m^-3·h^-1,204.08g·m^-3·h^-1and 90.91 g·m^-3·h^-1 for sole DMS,propanethiol and toluene,114.94 g·m^-3·h^-1,104.17 g·m^-3·h^-1 and 99.01 g·m^-3·h^-1 for mixture respectively.A CO₂ production rate in mixture gas treatment accordance with EC were y=2.26x?EBRT of 56 s?,y=1.88x?EBRT of 28 s?and y=1.72x?EBRT of 20 s?,respectively.Illumina MiSeq sequencing analysis indicated that Proteobacteria and Bacteroidetes were the major bacterial groups in BTF packing materials.The shift bacterial community structure could during biodegradation process.