AI Article Synopsis
- The study successfully combined autotrophic denitrification with anammox using electrochemical technology to efficiently remove nitrate by-products, achieving a nitrogen removal efficiency of 99.1%.
- The optimal voltage of 1.5 V allowed for effective nitrate removal without harming the anammox biomass, with the majority of nitrogen removal (about 79.4%) coming from the anammox process.
- Analysis showed that the anammox biomass remained dominant in the mixed bacterial community, indicating that both autotrophic denitrifiers and anammox bacteria can coexist in the electrochemical reactor.
Article Abstract
In this study, an autotrophic denitrification process was successfully coupled with anammox to remove the nitrate by-product via electrochemical technology. When the voltage applied to the combined electrode reactor was 1.5 V, the electrode reaction removed nitrate by using the autotrophic denitrification biomass without affecting the anammox biomass. The nitrogen removal efficiency of the combined electrode reactor reached 99.1% without detectable nitrate at an influent NO-N/NH-N ratio of 1.5. On day 223, using the model calculations based on reaction equations, 19.7% of total nitrogen was removed via the autotrophic denitrification process, while the majority of nitrogen removal (approximately 79.4%) was attributed to the anammox reaction. Small variations of the population numbers and community structure of artificial bacteria according to electron microscopy predicted that the anammox and autotrophic denitrifying biomasses could coexist in the electrode reactor. Then, 16S rRNA analysis determined that the anammox biomass group was always dominant in mixed flora during continuous cultivation.
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| http://dx.doi.org/10.1016/j.chemosphere.2017.12.058 | DOI Listing |
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