Influence of temperature fluctuations on one-stage deammonification systems in northern cold region
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Cold and fluctuant temperatures are still a bottleneck for the application of one-stage deammonification in mainstream anammox (anaerobic ammonium oxidation). In this study, to simulate the practical but critical operational condition under rapidly fluctuant temperatures between April and May in cold northern area, two deammonification reactors with anammox granular sludge and nitritation flocculent sludge were tested under the cold shock with temperature fluctuations (11–18 °C). Under the controlled temperature (32 °C), good performances were obtained in both reactors. However, after the cold shock (ca. 13 °C), both reactors deteriorated similarly. The ammonia removal efficiencies decreased by half, while total nitrogen (TN) removal efficiencies decreased by two thirds. Nitrite accumulated in both reactors, while nitrate production was not disturbed although its contributions from nitrite oxidizing bacteria (NOB) increased. In the stage with increasing wastewater temperatures (17.5 ± 2.2 °C), several operational conditions were tested to recover the performances, including limited dissolved oxygen, long hydraulic retention time (HRT), high nitrogen loading with elevated pH, and low NH4+–N (60 mg/L), which did not significantly improve the performances, while the phenomena of heterotrophic nitrate reduction dramatically improved the nitrogen removal performances under limited aeration. During the cold temperature shock, insufficient anammox activity, and nitrate overproduction were the main problems.
KeywordsOne-stage deammonification Nitrogen removal Temperature fluctuations NOB suppression
This work was supported by the Natural Science Foundation of Heilongjiang Province (No. ZD201412) and Harbin Science and Technology Program (2016RAXXJ010).
- Anthonisen A, Loehr R, Prakasam T, Srinath E (1976) Inhibition of nitrification by ammonia and nitrous acid. J Water Pollut Control Fed 48:835–852Google Scholar
- Apha A (1998) Standard methods for the examination of water and wastewater. American Public Health Association, Washington, DCGoogle Scholar
- Cui F (2012) Cold CANON: anammox at low temperatures. Master, Delft University of TechnologyGoogle Scholar
- Gonzalez-Martinez A, Rodriguez-Sanchez A, Garcia-Ruiz MJ, Muñoz-Palazon B, Cortes-Lorenzo C, Osorio F, Vahala R (2016) Performance and bacterial community dynamics of a CANON bioreactor acclimated from high to low operational temperatures. Chem Eng J 287:557–567. https://doi.org/10.1016/j.cej.2015.11.081 CrossRefGoogle Scholar
- Laureni M, Falås P, Robin O, Wick A, Weissbrodt DG, Nielsen JL, Ternes TA, Morgenroth E, Joss A (2016) Mainstream partial nitritation and anammox: long-term process stability and effluent quality at low temperatures. Water Res 101:628–639. https://doi.org/10.1016/j.watres.2016.05.005 CrossRefGoogle Scholar
- Wett B, Omari A, Podmirseg SM, Han M, Akintayo O, Gómez Brandón M, Murthy S, Bott C, Hell M, Takács I, Nyhuis G, O’Shaughnessy M (2013) Going for mainstream deammonification from bench-to full-scale for maximized resource efficiency. Water Sci Technol 68:283–289. https://doi.org/10.2166/wst.2013.150 CrossRefGoogle Scholar
- Zekker I, Rikmann E, Mandel A, Kroon K, Seiman A, Mihkelson J, Tenno T, Tenno T (2016) Step-wise temperature decreasing cultivates a biofilm with high nitrogen removal rates at 9°C in short-term anammox biofilm tests. Environ Technol 37:1933–1946. https://doi.org/10.1080/09593330.2015.1135995 CrossRefGoogle Scholar