The Co-occurrence of DNRA and Anammox during the anaerobic degradation of benzene under denitrification
| Autor: | Shuchan Peng, Xinkuan Han, Daijun Zhang, Lilan Zhang, Peili Lu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Denitrification Nitrogen Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences 01 natural sciences Denitrifying bacteria chemistry.chemical_compound Bioreactors Ammonium Compounds Environmental Chemistry Ammonium Anaerobiosis Environmental Restoration and Remediation Phylogeny 0105 earth and related environmental sciences Nitrates biology Bacteria Public Health Environmental and Occupational Health Benzene General Medicine General Chemistry biology.organism_classification Pollution Anoxic waters 020801 environmental engineering chemistry Anammox Environmental chemistry Candidatus Anaerobic exercise Oxidation-Reduction |
| Zdroj: | Chemosphere. 247 |
| ISSN: | 1879-1298 |
| Popis: | It was revealed that Anammox process promotes the anaerobic degradation of benzene under denitrification. This study investigates the effect of dissimilatory nitrate reduction to ammonium (DNRA) and exogenous ammonium on anaerobic ammonium oxidation bacteria (AnAOB) during the anaerobic degradation of benzene under denitrification. The results indicate that anammox occurs synergistically with organisms using the DNRA pathway, such as Draconibacterium and Ignavibacterium. Phylogenetic analysis showed 64% (16/25) and 36% (5/25) hzsB gene sequences, a specific biomarker of AnAOB, belonged to Candidatus 'Brocadia fuldiga' and Candidatus 'Kuenenia', respectively. Exogenous ammonium addition enhanced the anammox process and accelerated benzene degradation at a 1.89-fold higher average rate compared to that in the absence of exogenous ammonium and AnAOB belonged to Ca. 'Kuenenia' (84%) and Ca. 'Brocadia fuldiga' (16%). These results indicate that Ca. 'Brocadia fuldiga' could also play a role in DNRA. However, the diversity of abcA and bamA, the key anaerobic benzene metabolism biomarkers, remained unchanged. These findings suggest that anammox occurrence may be coupled with DNRA or exogenous ammonium and that anammox promotes anaerobic benzene degradation under denitrifying conditions. The results of this study contribute to understanding the co-occurrence of DNRA and Anammox and help explore their involvement in degradation of benzene, which will be crucial for directing remediation strategies of benzene-contaminated anoxic environment. |
| Databáze: | OpenAIRE |
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