Abstract
Nitrogen r emoval based on anaerobic a mmonium oxidation (anammox) has g ained tremendous popularity as it is energy efficient and environmentally friendly. In this case, anammox is c oupled w ith p artial n itrification (collectively called p artial n itritation-anammox or P N/A systems) t o a ccomplish ne arly 80–90% t otal i norganic ni trogen removal. Despite s ignificant k nowledge gained ab out t he p rocess en gineering an d microbiology related to PN/A systems, very little is known about the effect of external perturbations on P N/A s ystems e specially in a s ystem b iology f ramework. I n this research w e first evaluated t he effects o f m etal an d t oxic l oading o n an en riched anammox community. Thereafter, we operated a single-stage PN/A lab-scale reactor to evaluate the effect of temperature on t he process efficiency and system microbiology. Mercury led to a 50% reduction and lead caused a 20% reduction in specific anammox activity a t 0.8 m g/L concentrations. Cyanide, used as a t oxic ch emical, caused significant anammox activity inhibition at 50 pp b concentration. The results related to temperature changes showed that ammonium oxidizing bacteria (Nitrosomonas sp.) can maintain a relatively stable activity at lower temperatures (13~21°C), while anammox bacteria (Candidatus Brocadia) are more sensitive to temperature reductions.
Original language | English |
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Title of host publication | 88th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2015 |
Publisher | Water Environment Federation |
Pages | 1986-1993 |
Volume | 3 |
ISBN (Electronic) | 978-151087046-8 |
Publication status | Published - 2015 |
Event | 88th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2015 - Chicago, United States Duration: 26 Sep 2015 → 30 Sep 2015 |
Conference
Conference | 88th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2015 |
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Country | United States |
City | Chicago |
Period | 26/09/15 → 30/09/15 |
Keywords
- Anammox
- Heavy metals
- Nitrifying
- Temperature
- Toxic chemicals