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| Isolation and identification of a DMS-oxidizing bacterium and its impacts on swine manure composting |
| Received:July 28, 2015 |
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| KeyWord:dimethyl sulfide;Thiobacillus neapolitanus;16S rDNA;swine manure composting;enzyme activity |
| Author Name | Affiliation | E-mail | | GUO Yan-zhao | The College of Life Sciences, Northwest University, Xi'an 710069, China | | | FU Rui-min | The College of Life Sciences, Northwest University, Xi'an 710069, China
Department of Life Science, Henan Institute of Education, Zhengzhou 450046, China | | | XUE Ting-ting | The College of Life Sciences, Northwest University, Xi'an 710069, China | | | GU Ya-nan | The College of Life Sciences, Northwest University, Xi'an 710069, China | | | MA Wei-chao | The College of Life Sciences, Northwest University, Xi'an 710069, China | | | CHEN Wu-Ling | The College of Life Sciences, Northwest University, Xi'an 710069, China | wulingchen@yeah.net |
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| Abstract: |
| A DMS-oxidizing bacterial strain AM2 was isolated from activated sludge by using streak plate method, and was identified as Thiobacillus neapolitanus. Its optimum temperature and pH were respectively 30℃ and 7.0. Impact of the strain AM2 on swine and straw mixture composting was examined by monitoring DMS outputs, temperature, culturable microorganism population and enzyme activity in the compost. Compared with control, inoculation with AM2 not only significantly(P<0.05) decreased DMS outputs with over 60% reduction for 20 days during 30-day experimental period, but also significantly(P<0.05) promoted culturable microbe population. Compost temperature maintained above 50℃ for 13 days during the experimental period. Activities of dehydrogenase, urease, catalase, protease and cellulose were significantly(P<0.05) higher in DMS-inoculated than in control groups. To sum up, the strain AM2 can effectively reduce DMS emissions during composting process and promote compost maturity. |
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