Role of psychrotrophic bacteria in organic domestic waste composting in cold regions of China

[Display omitted] •Twelve new psychrotrophic strains were screened and used in low temperature composting.•Psychrotrophic bacterial obviously accelerated rises in temperature at the onset of composting.•The mixed psychrotrophic bacterial consortium influenced the composting quality.•An obvious micro...

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Bibliographic Details
Published in:Bioresource technology 2017-07, Vol.236, p.20-28
Main Authors: Hou, Ning, Wen, Luming, Cao, Huiming, Liu, Keran, An, Xuejiao, Li, Dapeng, Wang, Hailan, Du, Xiaopeng, Li, Chunyan
Format: Article
Language:English
Subjects:
Bacteria - chemistry
Carbon - chemistry
Cold Temperature
High-throughput sequencing
Microbial community structure
Organic domestic waste composting
Phylogeny
Psychrotrophic bacteria
Soil
Temperature
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Summary:[Display omitted] •Twelve new psychrotrophic strains were screened and used in low temperature composting.•Psychrotrophic bacterial obviously accelerated rises in temperature at the onset of composting.•The mixed psychrotrophic bacterial consortium influenced the composting quality.•An obvious microbial shift was observed after inoculation with psychrotrophic bacteria. To study the influence of psychrotrophic bacteria on organic domestic waste (ODW) composting in cold regions, twelve new efficient psychrotrophic composting strains were isolated. Together with the published representative composting strains, a phylogenetic tree was constructed showing that although the strains belong to the same phylum, the genera were markedly different. The twelve strains were inoculated into the ODW in the composting reactor at 13°C. After treatment, the indices of temperature, moisture content, pH, electrical conductivity, C/N, ammonium nitrogen, and nitrate nitrogen indicated that the compost had reached maturity. The thermophilic phase was reached at 17d, and composting was completed at 42d, a markedly shorter composting time than that in previous studies. High-throughput sequencing indicated that the inoculative strains became the dominant community during the mesophilic phase and that they enhanced the stability of the microbial community structure. Thus, psychrotrophic bacteria played a key role in low-temperature composting.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2017.03.166