Migration and transformation of nitrogen in sediment-water system within storm sewers
| Autor: | Yiyang Wang, Jie Zhou, Yanzhi Chen, Dafang Fu, Cuiyun Liu, Jingqin Zhou, Yuting Yang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Geologic Sediments
Environmental Engineering Nitrogen 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Clostridia Water column Waste Management and Disposal Nitrogen cycle 0105 earth and related environmental sciences biology Bacteria Chemistry Sediment Water General Medicine biology.organism_classification Anoxic waters Nitrification 020801 environmental engineering Environmental chemistry Nitrospira |
| Zdroj: | Journal of environmental management. 287 |
| ISSN: | 1095-8630 |
| Popis: | In the sediment–water system of storm sewers (e.g., sediments, interstitial water, and the water column), the migration of nitrogen and its biological transformation with different dissolved oxygen conditions were investigated. Results showed that in an aerobic segment, γ-proteobacteria, α-proteobacteria, and nitrospira, which are aerobic, grew actively in water column and interstitial water through ammonification and nitrification. In anoxic segment, ammonification depended mainly on clostridia, whereas nitrification was inhibited. Thus, after 20 days, the concentration of NH4+-N in the aerobic segment became noticeably lower (5.97 mg/L) than that in the anoxic segment (18.09 mg/L). In sediments, the biological transformation of organic nitrogen in the anoxic environment was more complete, resulting in elevating amino acid nitrogen and NH4+-N in the anoxic segment compared to the aerobic segment. Furthermore, the concentration gradient of NH4+-N between interstitial water and water column in aerobic and anoxic segments, thereby causing NH4+-N to migrate from interstitial water to the water column. In the sediment–water system, the different forms of nitrogen changes were the common result of biological transformation and material migration. |
| Databáze: | OpenAIRE |
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