Re-biodegradation of all alkanes after chemical oxidation in soils
| Autor: | Muhammad A. Imran, Jinlan Xu, Yuanyuan Zheng, Lu Xu, Peiqi Fan, Xue Qiao, Yanliang Dong |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Alkane
chemistry.chemical_classification education.field_of_study Degree (graph theory) Stratigraphy Population Order (ring theory) 04 agricultural and veterinary sciences 010501 environmental sciences Biodegradation 01 natural sciences Medicinal chemistry chemistry.chemical_compound Hydrocarbon chemistry Reagent 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Total petroleum hydrocarbon education 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of Soils and Sediments. 21:1348-1359 |
| ISSN: | 1614-7480 1439-0108 |
| DOI: | 10.1007/s11368-021-02879-1 |
| Popis: | This study aimed to investigate the rapid restoration of indigenous hydrocarbon degraders after chemical oxidation, in order to enhance the subsequent biodegradation of crude oil in soils. The Fe-SOM (2231 mg kg−1) and H2O2 were added into the oil-contaminated soil (total petroleum hydrocarbon (TPH): 16064 mg kg−1) for chemical oxidation. Then, the all and partial alkane re-biodegradation reagents were added for re-biodegradation experiments. Calculated and analyzed C-source (DOC and TPH) and N-source ( $$ {\mathrm{NH}}_4^{+}-\mathrm{N} $$ , $$ {\mathrm{NO}}_3^{-}-\mathrm{N} $$ , $$ {\mathrm{NO}}_2^{-}-\mathrm{N} $$ ) consumption and the population of hydrocarbon degraders in each period. After chemical oxidation, the total biodegradation of all alkanes (re-biodegradation degree: 100%) with reagent for all alkane re-biodegradation in the late stage was higher than that in the early stage. Further study found that DOC was the main C-source and $$ {\mathrm{NH}}_4^{+}-\mathrm{N} $$ was the main N-source in the early stage, while TPH and nitrate were the main C&N-sources in the late stage of re-biodegradation. In other words, the C&N-sources changed over to TPH and nitrate in the late stage. After re-biodegradation stage, increasing biodegradation (from 644 mg kg−1 in the 1st stage to 842 mg kg−1 in the 3rd stage) was observed. The results showed that re-biodegradation of all alkanes could recover growth of indigenous hydrocarbon degraders and continuously increase biodegradation of all alkanes after chemical oxidation. The C&N-sources changed from DOC and $$ {\mathrm{NH}}_4^{+}-\mathrm{N} $$ to all alkanes and $$ {\mathrm{NO}}_3^{-}-\mathrm{N} $$ during re-biodegradation stage was the key factor. |
| Databáze: | OpenAIRE |
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