Abstract
In this study, effluent sludge from a high-rate Anammox reactor was used to re-start new Anammox reactors for the reactivation of Anammox granular sludge. Different start-up strategies were evaluated in six upflow anaerobic sludge blanket (UASB) reactors (R1–R6) for their effect on nitrogen removal performance. Maximal nitrogen removal rates (NRRs) greater than 20 kg N/m3/day were obtained in reactors R3–R5, which were seeded with mixed Anammox sludge previously stored for approximately 6 months and 1 month. A modified Boltzmann model describing the evolution of the NRR fit the experimental data well. An amount of sludge added to the UASB reactor or decreasing the loading rate proved effective in relieving the substrate inhibition and increasing the NRR. The modified Stover–Kincannon model fit the nitrogen removal data in the Anammox reactors well, and the simulation results showed that the Anammox process has great nitrogen removal potential. The observed inhibition in the Anammox reactors may have been caused by high levels of free ammonia. The sludge used to seed the reactors did not settle well; sludge flotation was observed even after the reactors were operated for a long time at a floating upward velocity (Fs) of greater than 100 m/h. The settling sludge, however, exhibited good settling properties. Scanning electron microscopy showed that the Anammox granules consisted mainly of spherical and elliptical bacteria with abundant filaments on their surface. Hollows in the granules were also present, which may have contributed to sludge floatation.
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Abbreviations
- ABF:
-
Anaerobic biological filter
- Anammox:
-
Anaerobic ammonium oxidation
- ANMR:
-
Anammox non-woven membrane reactor
- CSTR:
-
Continuously stirred tank reactor
- EPS:
-
Exocellular polymeric substance
- FA:
-
Free ammonia
- Fs :
-
Floating upward velocity
- HRT:
-
Hydraulic retention time
- IAN:
-
Influent ammonium nitrogen
- INN:
-
Influent nitrite nitrogen
- NLR:
-
Nitrogen loading rate
- NRR:
-
Nitrogen removal rate
- PR:
-
Parent reactor
- R 2 :
-
Correlation coefficient
- SAA:
-
Specific Anammox activity
- SBR:
-
Sequencing batch reactor
- SD:
-
Standard deviation
- SEM:
-
Scanning electron microscopy
- SS:
-
Suspended solids
- SVI30 :
-
30-min sludge volume index
- SVI5 :
-
5-min sludge volume index
- TEM:
-
Transmission electron microscopy
- UAGSB:
-
Upflow Anammox granular sludge bed
- UASB:
-
Upflow anaerobic sludge blanket
- UBF:
-
Upflow biofilter
- Vs :
-
Settling velocity
- VSS:
-
Volatile suspended solids
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 50808060 & No. 51078121), the Zhejiang Provincial Natural Science Foundation of China (No. Y5090072) and the Science and Technology Development Program of Hangzhou (No. 20091133B06). The authors express gratitude to Dr. Ting–Ting Chen from the Department of Environmental Engineering at Zhejiang University for her help in granule diameter analysis.
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Yang, G.F., Jin, R.C. Reactivation of effluent granular sludge from a high-rate Anammox reactor after storage. Biodegradation 24, 13–32 (2013). https://doi.org/10.1007/s10532-012-9554-9
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DOI: https://doi.org/10.1007/s10532-012-9554-9