N2O production in a single stage nitritation/anammox MBBR process

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Table B2. Calculation parameters used to calculate the percentage N 2O-N produced by removed inorganic N. Parameter value unit rN2O 0.1555∙10 -6 mole/l min MN 14.01 g/mol 0.2116 · 10 mg/l rN 0.1555 · 10 · 2 · 14.01 0.2116 · 10 · 100 2.1% Assumptions made for this calculation are; (i) that the microorganisms in the system are unaffected of the changed operation conditions during the time span of one minute when the production rate is approximated, (ii)that the mass transfer of N2O through the phase boundary between liquid and air is negligible during the time interval of one minute, (iii) that there is no net change in production due to operating conditions during one cycle. 70
Appendix C Microsensor measurements 12 090918 Intermittent aeration, DO 3.0 (mg/l) 4.5 12 090921 Intermittent aeration, DO 3.0 (mg/l) 4.5 10 3.75 10 3.75 N₂O (µmol/l) 8 6 4 3 2.25 1.5 DO (mg/l) N₂O sensor (µmol/l) DO (mg/l) NO₂-N (mg/l) 8 6 4 3 2.25 1.5 DO (mg/l) NO₂-N biosensor (mg/l) DO (mg/l) 2 0.75 2 0.75 0 0 0 20 40 60 80 Time (min) 0 0 0 20 40 60 80 Time (min) Figure C1. Figure C4. 30 090918 Intermittent aeration, DO 3.0 (mg/l) 4.5 12 090922 Intermittent aeration, DO 3.0 (mg/l) 4.5 25 3.75 10 3.75 NO₂-N (mg/l) 20 15 10 5 3 2.25 1.5 0.75 DO (mg/l) NO₂-N biosensor (mg/l) DO (mg/l) N₂O (µmol/l) 8 6 4 2 3 2.25 1.5 0.75 DO (mg/l) N₂O (µmol/l) DO (mg/l) 0 0 0 20 40 60 80 Time (min) 0 0 0 20 40 60 80 Time (min) Figure C2. Figure C5. 12 10 090921 Intermittent aeration, DO 3.0 (mg/l) 4.5 3.75 40 090922 Intermittent aeration, DO 3.0 (mg/l) 4 N₂O (µmol/l) 8 6 4 2 3 2.25 1.5 0.75 DO (mg/l) N₂O sensor (µmol/l) DO (mg/l) NO₂-N (mg/l) 30 20 10 3 2 1 DO (mg/l) NO₂-N biosensor (mg/l) DO (mg/l) 0 0 0 20 40 60 80 Time (min) 0 0 0 20 40 60 80 Time (min) Figure C3. Figure C6. 71
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Water and Environmental Engineering
Page 5 and 6:
Summary Wastewaters contain abundan
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Acknowledgements I would like to ex
Page 11 and 12:
Table of content Chapter 1 ........
Page 13 and 14:
Chapter 1 1. Introduction Nitrogen
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1.3 Objectives The aim with this ma
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Chapter 2 2. Background 2.1 Biologi
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are intermediates in the chemical r
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minimum concentration of 2 mg/l sho
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2.3 Biofilm reactors Biofilm reacto
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2.3.4 Moving bed reactor Another wa
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To enable efficient nutrient remova
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The Canon process is often implemen
Page 31 and 32: 2.5.1 Nitrification as a source of
Page 33 and 34: Table 3. N 2O emission from differe
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: The rN value is calculated with the
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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