Performance of one-stage autotrophic nitrogen removal in a biofilm reactor with low C/N ratio

Abstract In this study, the completely autotrophic nitrogen removal over nitrite (CANON) process was initiated in a sequencing batch biofilm reactor (SBBR). Then the reactor was operated under different IC/N ratios. The total inorganic nitrogen removal efficiency (TINRE) at IC/N ratios of 0.75, 1.0, 1.25, 1.5 and 2.0 were 37.0 ± 11.0%, 58.9 ± 10.2%, 73.9 ± 3.2%, 73.6 ± 1.8% and 72.6 ± 2.0%, respectively. The suitable range of IC/N ratio in this research is 1.25–2.0. The poor nitrogen removal performance at IC/N ratio of 0.75 was due to the lack of growth substrate for AnAOB and low pH simultaneously; at IC/N ratio of 1.0 this was because the substrate concentration was insufficient for fully recovering the AnAOB activities. Microbial analysis indicated that Nitrosomonas, Nitrospira and Candidatus Brocadia were the main ammonium oxidation bacteria (AOB), nitrite oxidation bacteria (NOB) and anammox bacteria (AnAOB), respectively. In addition, at IC ratios of 1.25 or higher, denitrification was promoted with the rise of IC/N ratio, which might be because the change of IC concentrations caused cell lysis of microorganisms and provided organic matter for denitrification.

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Effects of extremely low bulk liquid DO on autotrophic nitrogen removal performance and NOB suppression in side- and mainstream one-stage PNA

Journal of Chemical Technology & Biotechnology ◽

10.1002/jctb.5649 ◽

2018 ◽

Vol 93 (10) ◽

pp. 2931-2941 ◽

Cited By ~ 3

Author(s):

Tiago Rogerio Vitor Akaboci ◽

Frederic Gich ◽

Maël Ruscalleda ◽

Maria Dolors Balaguer ◽

Jesús Colprim

Keyword(s):

Nitrogen Removal ◽

Bulk Liquid ◽

One Stage ◽

Autotrophic Nitrogen Removal

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Effect of pH on the Microbial Community Structure of SBBR Autotrophic Nitrogen Removal Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.378-379.428 ◽

2011 ◽

Vol 378-379 ◽

pp. 428-432

Author(s):

Yu Qin ◽

Jing Song Guo ◽

Fang Fang

Keyword(s):

Community Structure ◽

Microbial Community ◽

Nitrogen Removal ◽

Microbial Community Structure ◽

Anaerobic Bacteria ◽

Biofilm Reactor ◽

Active Sludge ◽

Removal Process ◽

The Relationship ◽

Autotrophic Nitrogen Removal

PCR-DGGE was applied to analyze the relationship between pH and the microbial community structure of Sequence Batch Biofilm Reactor (SBBR) autotrophic nitrogen removal process. The reactor was possessed of a high nitrogen removal efficiency at pH=8.0 where the similarity of microbial community structure between active sludge and biofilm samples was the lowest about 84.6% and the richness of bacterial community was the most abundant in biofilm compared with other pH conditions. pH=7.0 was good for the microbes in active sludge but unfavorable for anaerobic bacteria. At pH=9.0, the effects were presented with both bacterial activities and microbial community structure and when pH=6.0 the amount of microbial types dramatically dropped

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Population Dynamics of Aerobic and Anaerobic Ammonia Oxidizers in an Autotrophic Nitrogen Removal Membrane Biofilm Reactor

Proceedings of the Water Environment Federation ◽

10.2175/193864708788733431 ◽

2008 ◽

Vol 2008 (13) ◽

pp. 3209-3220

Author(s):

Kevin R. Gilmore ◽

Nancy G. Love ◽

Barth F. Smets ◽

Akihiko Terada ◽

Jay L. Garland

Keyword(s):

Population Dynamics ◽

Nitrogen Removal ◽

Biofilm Reactor ◽

Ammonia Oxidizers ◽

Membrane Biofilm Reactor ◽

Aerobic And Anaerobic ◽

Autotrophic Nitrogen Removal

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Model-based evaluation of the contribution of partial denitrification (PD) on the one-stage autotrophic nitrogen removal process

10.21203/rs.3.rs-179960/v1 ◽

2021 ◽

Author(s):

Chi Zhang ◽

Lianze Yu ◽

Miao Zhang ◽

Jun Wu

Keyword(s):

Nitrogen Removal ◽

Oxygen Demand ◽

Anammox Bacteria ◽

Removal Process ◽

One Stage ◽

Biofilm Model ◽

Nitrite Oxidizing Bacteria ◽

The One ◽

Steady State Simulation ◽

Autotrophic Nitrogen Removal

Abstract The nitrate produced by the one-stage partial nitritation-anammox (PN/A) process can be removed through partial denitrification (PD) by adding carbon source. In this study, a 1D multi-population biofilm model was developed to evaluate the contribution of partial denitrification on the one-stage autotrophic nitrogen removal process at influent NH4+ = 100 mg N/L. The dynamic simulation that was carried out to investigate the effect of nitrite-oxidizing bacteria (NOB) revealed that PD contributed to the reactor to obtain total nitrogen removal efficiency (TNR) of above 90% and the effluent nitrate was significantly decreased with the absence of NOB. However, PD decreased TNR of the one-stage PN/A process with the presence of NOB. Increased influent chemical oxygen demand (COD) widened the dissolved oxygen (DO) range required for high TNR whether NOB were present or not. The steady-state simulation results showed that NOB were always absent in the granules at high DO and COD levels and the optimum DO > 0.5 mg/L when influent COD was over 50 mg/L. Besides, higher influent COD/NH4+ (C/N) and larger granule diameter (diameter > 1600 µm) were contributed to widening the range of DO required for high TNR. The nitrogen removal contribution of anammox bacteria (AMX) was significantly higher than denitrification in the reactor.

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