N2O production in a single stage nitritation/anammox MBBR process

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found that when the added quantities of carbon source only allowed between 66-88% denitrification, N2O emissions from the system were increased from an average of 0.2% up to 1.3% of reduced nitrate. Long residence times for N2O in denitrifying sludge have been shown to result in smaller amounts of emitted N2O. Since N2O is an intermediate in the denitrification process dissolved N2O in the water phase can be turned over by the denitrifiers and a long residence time for N2O increases the possibility that the gas is converted into dinitrogen gas. The experiments showing these results were performed in 100 ml bottles with different sludge volumes which also indicates that N2O emission is greater from wastewater treatment basins with large surface to volume ratio (Gejlsbjerg et al., 1997). 2.5.3 Chemical production of N2O N2O can be produced by chemical denitrification in a wastewater treatment plant, the reduction follows the same pathway as during biologic denitrification shown in eq. (2.5.3). The difference is that chemical reductants are reducing the nitrogen compounds instead of microbial enzymes (Debruyn et al., 1994). Figures of N2O emissions from microbial nitrogen conversion found during the literature study are summarised in Table 3. 20
Table 3. N 2O emission from different wastewater treatment facilities given in % of influent N-concentrations. Reactor type Influent N-concentrations mg/l DO N 2O emission % of influent NH 4-N NO 2-N NO 3-N COD mg/l N-concentration Reference nitritation – anammox SBR 650 ±50
Page 1: Water and Environmental Engineering
Page 5 and 6: Summary Wastewaters contain abundan
Page 7: Acknowledgements I would like to ex
Page 11 and 12: Table of content Chapter 1 ........
Page 13 and 14: Chapter 1 1. Introduction Nitrogen
Page 15 and 16: 1.3 Objectives The aim with this ma
Page 17 and 18: Chapter 2 2. Background 2.1 Biologi
Page 19 and 20: are intermediates in the chemical r
Page 21 and 22: minimum concentration of 2 mg/l sho
Page 23 and 24: 2.3 Biofilm reactors Biofilm reacto
Page 25 and 26: 2.3.4 Moving bed reactor Another wa
Page 27 and 28: To enable efficient nutrient remova
Page 29 and 30: The Canon process is often implemen
Page 31: 2.5.1 Nitrification as a source of
Page 35 and 36: The microsensor is connected to a p
Page 37 and 38: Chapter 3 3. Material and Methods 3
Page 39 and 40: 3.3 Analytical methods Concentratio
Page 41 and 42: Figure 11. Calibration setup for mi
Page 43 and 44: Chapter 4 4. Results 4.1 Process pe
Page 45 and 46: 10 8 DO concentration, pH & tempera
Page 47 and 48: concentration), while the maximum p
Page 49 and 50: of N2O during aeration was slightly
Page 51 and 52: Table 13. Average N 2O concentratio
Page 53 and 54: 12 NO₂-N (mg/l) 10 8 6 4 2 NO₂-
Page 55 and 56: Aeration 1.6 (l/min) with carriers
Page 57 and 58: % produced N₂O 12 10 8 6 4 2 Prod
Page 59 and 60: laboratory system might be underest
Page 63: 6. Conclusions The following conclu
Page 67 and 68: 8. References Abma W.R., Schultz C.
Page 69 and 70: Hippen A., Rosenwinkel K-H., Baumga
Page 71 and 72: Metcalf & Eddy I. (2003). Wastewate
Page 73: van Niftrik L.A., Fuerst J.A., Sinn
Page 79 and 80: Appendix B Calculations of N2O emis
Page 81 and 82: The rN value is calculated with the
Page 83 and 84:
Appendix C Microsensor measurements
Page 85 and 86:
12 090927 Prolonged unaerated perio
Page 87:
12 091016 Continuously operation, D
Page 90 and 91:
350 090921 NH₄-N 350 090922 NH₄
Page 92 and 93:
300 090926 Prolonged unaerated peri
Page 94 and 95:
091010 NOx-N 091013 NOx-N NOx-N (mg
Page 96 and 97:
35 091015 NO₃-N 70 091016 NOx-N 3
Page 98 and 99:
350 091018 NH₄-N 35 091018NO₃-N
Page 100 and 101:
The bacteria performing the microbi
Page 102 and 103:
Typical profiles of how N2O and DO
Page 104 and 105:
12 10 091014 Continously operation,
Page 106:
Mulder A.V.A, Robertson L.A., Kuene
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N2O production in a single stage nitritation/anammox MBBR process

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