scholarly journals Effects of Hydraulic Retention Time and Influent Nitrate-N Concentration on Nitrogen Removal and the Microbial Community of an Aerobic Denitrification Reactor Treating Recirculating Marine Aquaculture System Effluent

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 650 ◽  
Author(s):  
Xiefa Song ◽  
Xiaohan Yang ◽  
Eric Hallerman ◽  
Yuli Jiang ◽  
Zhitao Huang
Keyword(s):  
Microbial Community ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Aerobic Denitrification ◽  
Marine Aquaculture ◽  
Nitrate N ◽  
Aquaculture System ◽  
N Concentration ◽  
Denitrification Reactor

The effects of hydraulic retention time (HRT) and influent nitrate-N concentration on nitrogen removal and the microbial community composition of an aerobic denitrification reactor treating recirculating marine aquaculture system effluent were evaluated. Results showed that over 98% of nitrogen was removed and ammonia-N and nitrite-N levels were below 1 mg/L when influent nitrate-N was below 150 mg/L and HRT over 5 h. The maximum nitrogen removal efficiency and nitrogen removal rate were observed at HRT of 6 or 7 h when influent nitrate-N was 150 mg/L. High-throughput DNA sequencing analysis revealed that the microbial phyla Proteobacteria and Bacteroidetes were predominant in the reactor, with an average relative total abundance above 70%. The relative abundance of denitrifying bacteria of genera Halomonas and Denitratisoma within the reactor decreased with increasing influent nitrate-N concentrations. Our results show the presence of an aerobically denitrifying microbial consortium with both expected and unexpected members, many of them relatively new to science. Our findings provide insights into the biological workings and inform the design and operation of denitrifying reactors for marine aquaculture systems.

The nitrogen removal potential of predenitrification systems in sensitive coastal areas

1995 ◽  
Vol 32 (7) ◽  
pp. 135-142
Author(s):  
E. Görgün ◽  
N. Artan ◽  
D. Orhon ◽  
R. Tasli
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Coastal Areas ◽  
Careful Evaluation ◽  
Denitrification Kinetics

Effective nitrogen removal is now required to protect water quality in sensitive coastal areas. This involves a much more difficult treatment process than for conventional domestic sewage as wastewater quantity and quality exhibits severe fluctuations in touristic zones. Activated sludge is currently the most widely used wastewater treatment and may be upgraded as a predenitrification system for nitrogen removal. Interpretation of nitrification and denitrification kinetics reveal a number of useful correlations between significant parameters such as sludge age, C/N ratio, hydraulic retention time, total influent COD. Nitrogen removal potential of predenitrification may be optimized by careful evaluation of wastewater character and the kinetic correlations.

Effect of hydraulic retention time on microbial community in biochemical passive reactors during treatment of acid mine drainage

2018 ◽  
Vol 247 ◽  
pp. 624-632 ◽  
Author(s):  
Yaneth Vasquez ◽  
Maria C. Escobar ◽  
Johan S. Saenz ◽  
Maria F. Quiceno-Vallejo ◽  
Carmen M. Neculita ◽  
...  
Keyword(s):  
Microbial Community ◽  
Acid Mine Drainage ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Acid Mine

Nitrogen removal from poultry slaughterhouse wastewater in anaerobic-anoxic-aerobic combined reactor: Integrated effect of recirculation rate and hydraulic retention time

2022 ◽  
Vol 303 ◽  
pp. 114162
Author(s):  
Carla Limberger Lopes ◽  
Tatiane Martins de Assis ◽  
Fernando Hermes Passig ◽  
Adriana Neres de Lima Model ◽  
Juliana Bortoli Rodrigues Mees ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Slaughterhouse Wastewater ◽  
Recirculation Rate

Anoxic Microbial Community Robustness Under Variation of Hydraulic Retention Time and Availability of Endogenous Electron Donors

2020 ◽  
Vol 192 (2) ◽  
pp. 443-454
Author(s):  
Dagoberto Y. Okada ◽  
Rachel B. Costa ◽  
Caroline de Cassia B. Garcia ◽  
Eloisa Pozzi ◽  
Theo S. O. Souza ◽  
...  
Keyword(s):  
Microbial Community ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Electron Donors

scholarly journals Nitrogen removal in a shallow maturation pond with sludge accumulated during 10 years of operation in Brazil

2017 ◽  
Vol 76 (2) ◽  
pp. 268-278 ◽  
Author(s):  
V. A. J. Rodrigues ◽  
E. F. A. Mac Conell ◽  
D. F. C. Dias ◽  
M. von Sperling ◽  
J. C. de Araújo ◽  
...  
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Metabolic Pathways ◽  
Hydraulic Retention Time ◽  
Sediment Cores ◽  
Anammox Bacteria ◽  
Daily Cycles ◽  
Polymerase Chain ◽  
Nitrification And Denitrification

Accumulated sludge in polishing (maturation) ponds reduces the hydraulic retention time (smaller useful volume), and this could potentially lead to a decrease in performance. However, settled biomass, present in the sediments, can contribute to nitrogen removal by different mechanisms such as nitrification and denitrification. This study investigated the influence of the bottom sludge present in a shallow maturation pond treating the effluent from an anaerobic reactor on the nitrification and denitrification processes. Nitrification and denitrification rates were determined in sediment cores by applying ammonia pulses. Environmental conditions in the medium were measured and bacteria detected and quantified by real-time polymerase chain reaction (real-time PCR). The pond showed daily cycles of mixing and stratification and most of the bacteria involved in nitrogen removal decreased in concentration from the upper to the lower part of the sludge layer. The results indicate that denitrifiers, nitrifiers and anammox bacteria coexisted in the sludge, and thus different metabolic pathways were involved in ammonium removal in the system. Therefore, the sediment contributed to nitrogen removal, even with a decrease in the hydraulic retention time in the pond due to the volume occupied by the sludge.

Microbial community in methanogenic packed-bed reactor successfully operating at short hydraulic retention time

2006 ◽  
Vol 101 (3) ◽  
pp. 271-273 ◽  
Author(s):  
Kengo Sasaki ◽  
Shin Haruta ◽  
Masahiro Tatara ◽  
Akira Yamazawa ◽  
Yoshiyuki Ueno ◽  
...  
Keyword(s):  
Microbial Community ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Packed Bed ◽  
Packed Bed Reactor

Impact of the Hydraulic Retention Time on the Performance of a Sulfidogenic Bioreactor

2013 ◽  
Vol 825 ◽  
pp. 392-395 ◽  
Author(s):  
Robert Klein ◽  
Michael Schlömann ◽  
Yun Zeng ◽  
Bernd Wacker ◽  
Franz Glombitza ◽  
...  
Keyword(s):  
Microbial Community ◽  
Sulfate Reduction ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Reduction Process ◽  
Nucleotide Sequence Analysis ◽  
Rrna Gene ◽  
Mine Waters ◽  
Depth Analysis ◽  
Acidic Mine Water

Treatment of acidic Fe (II)- and sulfate-rich mine waters represents a major problem in many areas of the world. Therefore, a process was developed which utilises naturally occurring sulfate-reducing microorganisms for the elimination of sulfate and of part of the acidity from the acidic mine water. In order to improve the performance of this biological sulfate reduction process an in-depth analysis of the microbial diversity and activity in dependence of the hydraulic retention time (HRT) and other process parameters used to run the bioreactors was undertaken. This comparison demonstrated a positive correlation between shorter HRT and increasing sulfate reduction rates. The improvement in performance with decreasing HRT was paralleled by an increase of the total enzymatic activity (measured as hydrolase activity) of the microbial community and of the biomass (measured as protein concentration) in the bioreactors. A partial taxonomic identification of the microbial community in the bioreactors was achieved via nucleotide sequence analysis of a clone library of PCR-amplified 16S rRNA gene fragments prepared from a sample of the microbial biofilm in the bioreactor. Additionally, the genetic fingerprint technique T-RFLP was used to assess temporal changes of the microbial community in the biofilm within the reactor.

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