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| The corrosive effects of Thiobacillus ferrooxidans on heavy metal-enriched plant |
| Received:June 20, 2016 |
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| KeyWord:ryegrass;Thiobacillus ferrooxidans;corrosive effects;cellulose;hemicellulose;lignin |
| Author Name | Affiliation | E-mail | | WANG Li | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Enviromental Security, Southwest University of Science and Technology, Mianyang 621010, China | | | CHEN Xiao-ming | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Enviromental Security, Southwest University of Science and Technology, Mianyang 621010, China | cxmhyx99@163.com | | XIAO Wei | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Enviromental Security, Southwest University of Science and Technology, Mianyang 621010, China | | | ZHANG Xiang-hui | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Enviromental Security, Southwest University of Science and Technology, Mianyang 621010, China | | | LUO Xue-gang | School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Enviromental Security, Southwest University of Science and Technology, Mianyang 621010, China | |
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| Abstract: |
| In order to obtain the optimal processing conditions and solve the resource utilization for the biological pretreatment of heavy metal-enriched plants, this paper explored the corrosive behavior of ryegrass(Lolium perenne) inoculated Thiobacillus ferrooxidans(T.f) under different concentrations of substrates(including S0, Na2S2O3, FeSO4, FeS and Fe0) conditions. Destruction of the cell wall structure of ryegrass was detected by scanning electron microscopy. The results showed that T.f had strong corrosion effect on ryegrass. There was no significant difference of degradation effect in inoculation amount(5%~10%) of T.f. At the 10th day, the cellulose digestibility, hemicellulose digestibility, and lignin digestibility of ryegrass were 40.97%, 77.49%, and 19.33%, respectively with 10% T.f. After supplementing different substrates with T.f, the digestibility of cellulose was significantly improved. Overall, the digestibility of ryegrass was better at the dosing quanlity of S0 was 14 g·L-1. In this case, the digestibility of cellulose, hemicellulose and lignin of ryegrass can be up to 81.31%, 82.29% and 26.02%, respectively. Meanwhile, the recovery efficiency of uranium, chromium and cadmium were high. Under the mutual influences of T.f and different substrates, the pH of all substrates groups declined dramatically, except the groups of FeS and Fe0. The lowest value of pH was about 1.0 at the 10th day. The results showed that the decrease of pH could effectively increase the digestibility of hemicelluloses, but no significant relationship on the cellulose and lignin. Futhermore, T.f had strong destructive action on the cell wall structure of ryegrass detected by the scanning electron microscope. T.f made strong corrosion on ryegrass and combined with making full use of the substrates, it could improve the digestibility of cellulose of ryegrass. To summary, the study on both corrosion efficiency of lignin and recovery efficiency of heavy metals will be improved in the further. |
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