Microbial community structure and dynamics in swine wastewater treatment system

To elucidate the bacterial community dynamics in swine wastewater treatment system, the bacterial community characteristics in different treatment units of swine wastewater was analyzed by Illumina Miseq high-throughput sequencing technologies, and the correlation between bacterial community and water quality or antibiotics was investigated. The results demonstrated that microbial community structure varies greatly in different wastewater treatment processes. The dominant bacteria in fouling pool and anaerobic reator were Firmicutes, Bacteroidetes and Proteobacteria, the dominant bacteria in aeration tan were Firmicutes, Verrucomicrobia, Bacteroidetes, Proteobacteria and Candidatus Saccharibacteria, while in oxidation pond, the dominant bacteria were Firmicutes, Proteobacteria, Chloroflexi, Euryarchaeota and Bacteroidetes. The microbial comminity structure in wasterwater treatment system was significantly correlated with both water quality and antibiotics (P<0.05). Acinetobacter, Bacteroides, Prevotella, Lachnospiracea_incertae_sedis correlated closely with COD、TN、NH4+-N. Clostridium sensu strict, Methanothrix correlated closely with TN、NH4+-N. Petrimonas, Lachnospiracea_incertae_sedis, Clostridium XlVa, Tissierella extremely significant positively correlated with sulfamethoxazole, sulfamethoxazole, doxycycline, oxytetracycline. Acinetobacter, Bacteroides, Prevotella significant positively correlated with enrofloxacin and tetracycline. Prevotella, Lachnospiracea_incertae_sedis positively correlated with ciprofloxacin. Clostridium sensu stricto, Petrimonas positively correlated ofloxacin.