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| Application of nitrogen and phosphorus in remediation of fluoranthene-contaminated soil |
| Received:April 29, 2021 |
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| KeyWord:fluoranthene;nitrogen;phosphorus;polyphenol oxidase;PAHs-contaminated soil remediation |
| Author Name | Affiliation | E-mail | | CHEN Xuemei | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | ZHANG Fuying | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | ZHU Xuezhu | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | zhuxuezhu@njau.edu.cn | | ZHAO Haiyan | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | Lü Baitao | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| A soil culture experiment was conducted to investigate the effects of nitrogen and phosphorus on polycyclic aromatic hydrocarbons (PAHs) removal in polluted soil. In this experiment, fluoranthene was selected as a representative of PAHs. The concentrations of the added nitrogen and phosphorus were 0, 150, 300, 450 and 600 mg·kg-1. The effects of nitrogen and phosphorus on soil enzyme activity, were accessed to examine the mechanism of fluoranthene removal. The results showed that the addition of nitrogen and phosphorus was beneficial to the removal of fluoranthene in contaminated soil; the half-life of fluoranthene in soil was shortened by up to 78.4%. In the contaminated soil with 100 mg·kg-1 fluoranthene, the removal rate constant of fluoranthene was increased by 388.9% through the addition of 300 mg·kg-1 of nitrogen and was increased by 477.8% through the addition of 150 mg·kg-1 of phosphorus. The addition of nitrogen and phosphorus had certain effects on the activities of urease, phosphatase and polyphenol oxidase in soil. The activities of urease and acid phosphatase in soil were significantly increased by adding phosphorus. The acid phosphatase activity in soil contaminated with low fluoranthene was significantly increased by the addition of nitrogen. The addition of nitrogen and phosphorus could significantly increased the activity of polyphenol oxidase. An increase in polyphenol oxidase activity was significantly correlated with the removal of fluoranthene in soil. In conclusion, the optimal amount of nitrogen and phosphorus added in the polluted, yellow-brown soil is 150~300 mg·kg-1, this can effectively change soil enzyme activities and promote PAHs removal. |
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