Abstract
Biofilters have been broadly applied to degrade the odorous gases from industrial emissions. A industrial scale biofilter was set up to treat the odorous gases. To explore biofilter potentials, the microbial community structure and function must be well defined. Using of improved biofilter, the differences in microbial community structures and functions in biofilters before and after treatment were investigated by metagenomic analysis. Odorous gases have the potential to alter the microbial community structure in the sludge of biofilter. A total of 90,016 genes assigned into various functional metabolic pathways were identified. In the improved biofilter, the dominant phyla were Proteobacteria, Planctomycetes, and Chloroflexi, and the dominant genera were Thioalkalivibrio, Thauera, and Pseudomonas. Several xenobiotic biodegradation-related pathways showed significant changes during the treatment process. Compared with the original biofilter, Thermotogae and Crenarchaeota phyla were significantly enriched in the improved biofilter, suggesting their important role in nitrogen-fixing. Furthermore, several nitrogen metabolic pathway-related genes, such as nirA and nifA, and sulfur metabolic pathway-related genes, such as fccB and phsA, were considered to be efficient genes that were involved in removing odorous gases. Our findings can be used for improving the efficiency of biofilter and helping the industrial enterprises to reduce the emission of waste gases.
Highlights
Biofilters have been broadly applied to degrade the odorous gases from industrial emissions
Our study evaluated the improved performance in removing odorous gases containing NH3 and H2S
Microbial community structures were largely affected by odorous gas treatment[34,35]
Summary
Biofilters have been broadly applied to degrade the odorous gases from industrial emissions. A number of technologies have been developed to control air pollution caused by odorous gases Most of these technologies can be classified into three different groups, including physical methods, chemical methods, and biological m ethods[9]. Biofilter is commonly used for the harmlessness treatment of industrial odorous gases by forcing waste gases to rise through a layer of packed material[12]. Several key parameters, such as nutrients, temperature, pH value, Scientific Reports | (2022) 12:1731. It is important to take the improvement of microbial community into consideration
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