Treatment of municipal sewage with low carbon-to-nitrogen ratio via simultaneous partial nitrification, anaerobic ammonia oxidation, and denitrification (SNAD) in a non-woven rotating biological contactor

In this study, a non-woven rotating biological contactor was evaluated for the treatment of municipal sewage via simultaneous partial nitrification, anaerobic ammonia oxidation (anammox), and denitrification (SNAD). Fluorescence in situ hybridization analysis showed that the dominant bacterial group...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2018-10, Vol.208, p.854-861
Main Authors: Wang, Dong, Wang, Guowen, Yang, Fenglin, Liu, Changfa, Kong, Liang, Liu, Ying
Format: Article
Language:English
Subjects:
Ammonia - chemistry
Anaerobiosis
Bacteria - metabolism
Bioreactors - microbiology
C/N
Carbon - metabolism
Denitrification
Environmental Restoration and Remediation
Municipal sewage
Nitrification
Nitrogen - metabolism
Oxidation-Reduction
Oxygen - analysis
Response surface methodology
Sewage - microbiology
SNAD
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Summary:In this study, a non-woven rotating biological contactor was evaluated for the treatment of municipal sewage via simultaneous partial nitrification, anaerobic ammonia oxidation (anammox), and denitrification (SNAD). Fluorescence in situ hybridization analysis showed that the dominant bacterial group in the aerobic outer layer of the biofilm was ammonia-oxidizing bacteria (65.13%), whereas anammox (47.17%) and denitrifying (38.91%) bacteria were present in the anaerobic inner layer. Response surface methodology was applied to develop mathematical models for the interaction between C/N and dissolved oxygen (DO) for chemical oxygen demand (COD) and total nitrogen (TN) removal. Results showed that the optimum region for SNAD was at C/N = 1.4–2.3 and DO = 0.2–0.8 mg/L. The most optimal operating condition was determined at C/N = 2.3 and DO = 0.2 mg/L, with actual removal rates of COD and TN were 83.12% and 79.13%, respectively, which are in close model consistency with model prediction (84% and 80%). [Display omitted] •SNAD was successfully carried out in the NRBC treating low C/N municipal sewage.•RSM was applied to develop models for the interaction between C/N and DO for SNAD.•The optimum region for SNAD was at C/N = 1.4–2.3 and DO = 0.2–0.8 mg/L.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2018.06.061