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| Effect of starch and aeration addition on degradation of HMW-PAHs by immobilized Fusarium.sp in a polluted and aged soil of a coal mining area |
| Received:April 28, 2016 |
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| KeyWord:a coal mining area;HMW-PAHs;immobilized Fusarium.sp;starch;aeration;soil enzyme activity |
| Author Name | Affiliation | E-mail | | ZHANG Xue-na | College of Resource and Environment Science, Agricultural University of Hebei, Baoding 071000, China | | | JIA Hai-bin | College of Resource and Environment Science, Agricultural University of Hebei, Baoding 071000, China | | | LI Cheng | Hebei Institute of Environmental Science, Shijiazhuang 050000, China | | | WANG Wei | College of Resource and Environment Science, Agricultural University of Hebei, Baoding 071000, China | | | ZHANG Li-xiu | College of Resource and Environment Science, Agricultural University of Hebei, Baoding 071000, China | | | FENG Sheng-dong | College of Resource and Environment Science, Agricultural University of Hebei, Baoding 071000, China | fengshengdong@126.com | | YANG Zhi-xin | College of Resource and Environment Science, Agricultural University of Hebei, Baoding 071000, China
Key laboratory for Farm Land Eco-environment, Baoding 071000, China | yangzhixin@126.com |
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| Abstract: |
| The soil incubation experiment was performed to study the effect of starch and aeration addition on HMW-PAHs degradation by Fusarium.sp in polluted and aged soil of a coal mining area. After 60 days incubation, the degradation rate of 10 HMW-PAHs as well as the change rule of soil enzyme activities were analyzed. The results showed that the treatments were in the following order in terms of ∑10 HMW-PAHs degradation rate:immobilized Fusarium.sp+starch+aeration(J+D+O, 29.19%)≈immobilized Fusarium.sp+starch(J+D, 25.89%)>immobilized Fusarium.sp(J, 16.54%). There was no significant difference between J+D+O and J+D for the degradation of ∑4-rings, ∑5-ring and ∑6-ring PAHs, but their degradation rates were higher than J significantly(P<0.05). The degradation range of 10 individual HMW-PAHs were 9.12%~21.73%, 17.93%~43.12%, 24.34%~35.79% in J, J+D and J+D+O treatments respectively. The results demonstrated that far higher degradation rates of the 10 individual HMW PAHs were achieved in J+D+O and J+D treatments than those in J treatment, but there was no significant difference between J+D+O and J+D. The removal rates of BkF presented the highest increase extent in the two treatments and increased 68.09%, 63.78% respectively. In addition, the treatments were in the following order in terms of catalase enzyme activities:CK > J > J+D > J+D+O(P<0.05). We found that there were significant(P<0.05) linear negative correlation between the removal rates of the 10 individual HMW-PAHs and catalase activity in soil. However, the degradation rate of Chry, BkF, InP, DbA, BghiP had significant(P<0.05) linear positive correlation with lignin peroxidase activity. In conclusion, the individual PAH was removed by different treatments selectively, and the degradation rate were significantly improved by adding starch. |
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