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| Screening of functional extreme thermophiles and their effects on improving the maturation of composting |
| Received:January 02, 2020 |
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| KeyWord:extreme thermophiles;growth characteristics;enzyme activity;composting;maturity |
| Author Name | Affiliation | E-mail | | WANG Yu | College of Life Sciences, Anhui Normal University, Wuhu 241000, China
Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHANG Jing | Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, China | | | CAO Yun | Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, China | | | WU Hua-shan | Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, China | | | HUANG Hong-ying | Recycling Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, China | sfmicrolab@aliyun.com | | LIU Ai-min | College of Life Sciences, Anhui Normal University, Wuhu 241000, China | amliu9393@163.com |
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| Abstract: |
| Nine strains of extremely thermophilic bacteria were isolated during the high temperature period of different types of composts, and their classification statuses were identified by 16S rDNA analysis. Six strains were selected to be compounded into an extremely thermophilic inoculum according to their growth characteristics and enzyme activities. The effects of the extremely thermophilic inoculum on the maturation of composting were studied in a mimic experiment. The results showed that the nine strains isolated in this study belonged to the Geobacillus sp., Thermus sp., Parageobacillus sp., and Rhodothermus sp. The optimal growth temperatures of the isolated strains ranged from 65~70℃; Strains NY-44, D, and E were alkalophiles because their optimum growth pH was 9.5. Strain NY-44 was a halophile because its optimum growth salt concentration was 20 g·L-1. The protease activities of Geobacillus and Parageobacillus strains were higher than those of other strains, and their optimal reaction temperatures were over 80℃. The seed germination index(GI)and the ratio of humic acids to fulvic acids(HA/FA)in the extreme thermophilic bacteria inoculation treatment were 35.9% and 21.3% greater than those in the non-inoculation control at 30 days of composting, respectively. The results indicate that inoculation with extreme thermophiles can accelerate the maturation of composting and improve the quality of the compost. |
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