Abstract:

The research aimed to obtain efficient sulfur compound-degrading bacteria and measure deodorization effects. Based on deodorizing microbial flora isolated from livestock and poultry manure, activated sludge, leachate, and sewage, sulfate induction rate and sulfur ion degradation tests were conducted, the phylogenetic tree and chicken manure degradation simulation experiments were carried out. A total of 82 bacterial strains were screened, among which 4 strains exhibited higher sulfate induction rates. The order of induction ability was as follows: 3Shui-5 > 6-3-4 > 5-4-1 > 6-2-1, with induction rates being 75%-108%, 58%-83%, 50%-67%, and 20%-41% higher than the control group, respectively. The strain 3Shui-5 showed the best sulfur ion degradation effect, achieving a degradation rate of 98.64% in 2 hours. Morphological characteristics analysis and phylogenetic tree construction indicated that 3Shui-5 belonged to the same clade as Defluvibacter lusatiae type strain DSM11099T, both classified as Aquamicrobium. Chicken manure degradation simulation experiments demonstrated that 3Shui-5 could inhibit ammonia and hydrogen sulfide by over 95%. The strain 3Shui-5 could effectively improve the treatment of malodorous gases in livestock farms, providing a good reference for the practical application of microbial deodorization technology.

Key words: efficient sulfide-degrading bacteria, deodorization, H₂S, chicken manure degradation simulation experiment, desulfurization bacterium, NH₃, microbial community, sulfate induction rate, sulfur ion degradation, livestock farms