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[Microbial Community Diversity Analysis During Composting of Lincomycin Mycelia Dreg with Manure].

Aerobic composting experiments were conducted using lincomycin mycelia wastes (dreg) and manure (T), using sewage sludge with manure as a control (CK). High performance liquid phase methods and high throughput sequencing were used to determine the concentration of lincomycin residue and to characterize the microbial community. The results showed that lincomycin was reduced significantly, with the concentration decreasing from 1800 mg·kg-1 to 483 mg·kg-1, accounting for 73% degradation. In addition, the bacterial community abundance and diversity indices were all lower than that of sludge-manure at the mesophilic and thermophilic phases, because of the high concentration of lincomycin residue in lincomycin mycelia dreg. By contrast, the fungal community abundance and diversity indices showed the reverse, due to the high content of organic matter and nitrogen in lincomycin mycelia dreg. Therefore, the microbial communities were greatly different between T and CK treatment with the domain genera of Paucisalibacillus, Cerasibacillus, Bacillus, Virgibacillus, Ureibacillus, Paenibacillus, and Sinibacillus in T compost and Truepera, Actinomadura, Pseudosphingobacterium, Pseudomonas, Luteimonas and Ureibacillus in CK compost. However, as the composting continued to a mature phase, most of the lincomycin was reduced, and the differences between the two microbial communities gradually decreased. This showed that composting could make lincomycin mycelia dreg harmless and could be used to turn it into a resource.