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| Biosorption and degradation characteristics of PAHs by white rot fungi and enhancement of Tween 80 and Cu2+ |
| Received:August 22, 2019 |
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| KeyWord:white rot fungi;PAHs;biosorption;biodegradation;Tween 80;Cu2+ |
| Author Name | Affiliation | | BAN Qiao-ying | College of Environment and Resource, Shanxi University, Taiyuan 030006, China | | WU Dong-yang | College of Environment and Resource, Shanxi University, Taiyuan 030006, China | | LI Jian-zheng | School of Environment, Harbin Institute of Technology, Harbin 150090, China | | LIU Qi | College of Environment and Resource, Shanxi University, Taiyuan 030006, China |
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| Abstract: |
| To reveal the removal characteristics of polycyclic aromatic hydrocarbons(PAHs)by white rot fungi, the biosorption and biodegradation of naphthalene, phenanthrene, and pyrene were investigated using batch culture. The effects of Tween 80 and Cu2+ on the removal of naphthalene, phenanthrene, and pyrene by white rot fungi were also explored. The biosorption results showed that the biosorption of PAHs by killed white rot fungi was significantly higher than that of live fungi at the initial concentrations of naphthalene, phenanthrene, and pyrene as 30, 1.0, and 0.1 mg·L-1, respectively. The maximum adsorption rates for naphthalene, phenanthrene, and pyrene reached 29.3%, 38.2%, and 70.6%, respectively. The biodegradation results showed that white rot fungi exhibited weak degradative ability against naphthalene and phenanthrene in the early stages, whereas degradation accounted for 59.6%~77.3% of the total removal in the later stages of cultivation. Nevertheless, the accumulative degradation rate of pyrene was 28.8%. Under the co-action of adsorption and degradation, the removal of naphthalene, phenanthrene, and pyrene was achieved to be 46.9%, 53.5%, and 73.7%, respectively. Furthermore, the present study reported that Tween 80 and Cu2+ were capable of facilitating the removal of PAHs. At the concentration of Tween 80 of 0.1~1.0 g· L-1, the removal of naphthalene and phenanthrene was increased as Tween 80 concentration increased. However, pyrene removal showed a decreasing after increasing trend with increasing Tween 80 concentration. Tween 80 not only promoted the growth of white rot fungi, but also enhanced laccase activity. A low concentration of Cu2+(≤ 1.25 mmol·L-1)could enhance the laccase activity of white rot fungi, thereby improving the removal of naphthalene, phenanthrene and pyrene. The strengthening effect was the most significant at 0.25 mmol·L-1 of Cu2+. The removal of naphthalene, phenanthrene and pyrene was increased by 77.3%, 60.9% and 23.2%, respectively. |
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