AI Article Synopsis
- The study focused on how the anammox (anaerobic ammonium oxidation) process is affected by organic matter, revealing that N-removal efficiency dropped significantly under certain conditions.
- After being exposed to COD shocks, the anammox process took between 8 to 20 days to show operational recovery, with full recovery noted at 40 days.
- The research utilized various assessment methods, including isotope labeling, to reliably measure anammox recovery and its contribution to nitrogen loss after disturbances.
Article Abstract
Anaerobic ammonium oxidation (anammox) pathway is sensitive to organic matter, and its recovery requires reliable evidence regarding the dominance of anammox in N-removal. This study showed that the anammox process deteriorated, with N-removal efficiencies rapidly decreasing from 87.2 to 45.7% when reactors were exposed to COD shocks of 1.12, 2.24 and 3.36 g L (COD/N ratio 2, 4 and 6). Comprehensive assessments of water quality, microbial characteristics and isotope analysis were adopted to investigate anammox recovery. Operational performance took 8-20 days to recover; anammox relative abundance recovered after 20 days, based on the results of fluorescence in situ hybridisation and quantitative PCR; and the anammox pathway contributed to 80.0-91.5% of N-loss 40 days after COD shock terminated, based on the results of the isotope labelling experiment. Therefore, a complete recovery required 40 days. The isotope labelling method supplied a reliable reference for recovery assessment of anammox system in real-world applications.
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| http://dx.doi.org/10.1007/s00449-019-02260-0 | DOI Listing |
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