Effect of hydraulic retention time on nitrogen removal and functional gene quantity/transcription in biochar packed reactors at 5 °C: A control-strategy study

2018 ◽  
Vol 264 ◽  
pp. 400-405 ◽  
Author(s):  
Su He ◽  
Lili Ding ◽  
Yao Pan ◽  
Haidong Hu ◽  
Lin Ye ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Control Strategy ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Functional Gene ◽  
Strategy Study

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.

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

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.

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.

Upgrading to nitrogen removal with the kmt moving bed biofilm process

1994 ◽  
Vol 29 (12) ◽  
pp. 185-195 ◽  
Author(s):  
Bjørn Rusten ◽  
Jon G. Siljudalen ◽  
Bjørnar Nordeidet
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Mechanical Treatment ◽  
Hydraulic Retention Time ◽  
Biofilm Reactor ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Biofilm Process ◽  
Full Scale Tests

A new moving bed biofilm reactor (MBBR) has been developed in Norway. The biomass is attached to carrier elements that move freely along with the water in the reactor. It has been demonstrated that existing, high loaded, activated sludge plants can easily be upgraded to nitrogen removing MBBR plants. With chemically enhanced mechanical treatment, full scale tests showed that 80-90% total nitrogen could be removed in a MBBR plant at a total empty bed hydraulic retention time (HRT) of 2.6 hours. The plant was operated in the post-denitrification mode, using methanol as an external carbon source.

Effects of Hydraulic Retention Time on Organic and Nitrogen Removal in a Sponge-Membrane Bioreactor

2013 ◽  
Vol 30 (4) ◽  
pp. 194-199 ◽  
Author(s):  
Bui Xuan Thanh ◽  
Håkan Berg ◽  
Le Nguyen Tuyet Nguyen ◽  
Chau Thi Da
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Membrane Bioreactor ◽  
Hydraulic Retention Time

scholarly journals Effect of hydraulic retention time on nitrogen removal in domestic wastewater by partial nitritation and Anammox processes

2020 ◽  
Vol 14 (2) ◽  
pp. 127-136
Author(s):  
Nguyen Thi My Hanh ◽  
Tran Thi Hien Hoa
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Domestic Wastewater ◽  
Treatment Efficiency ◽  
Treatment Technology ◽  
Partial Nitritation ◽  
Conventional Technology ◽  
Nitrogen Treatment ◽  
Anammox Process

The nitrogen treatment technology using the Anammox process is known to have advantages over conventional technology of nitrification - denitrification. For the purpose of evaluating the effect of hydraulic retention time to nitrogen removal in domestic wastewater by Anammox process, the authors conducted the study on partial nitritation and Anammox reactors, separately. Partial nitritation (PN) reactor used Felibendy plate material with Nitrosomonas bacteria while Anammox (AX) reactor used Felibendy cubes carrier material with strain Candidatus Brocadia anammoxidans. This study was implemented during 210 days. The nitrogen treatment efficiency of the system was evaluated with different hydraulic retention times (HRTs). The short HRT of 4.5 hours in the AX reactor affected to the total nitrogen treatment efficiency is low of 52.76 ± 1.29%. With the hydraulic retention times in PN + AX reactors of 9 and 6 hours, the effluent quality met the requirements of B-column according to QCVN 14:2008/BTNMT or QCVN 40:2011/BTNMT. Keywords: Nitrosomonas; Candidatus Brocadia anammoxidans; partial nitritation process; Anammox process; nitrogen treatment.

High-rate pond for treatment of piggery wastes

2000 ◽  
Vol 42 (10-11) ◽  
pp. 357-362 ◽  
Author(s):  
R. H. Costa ◽  
W. Medri ◽  
C. C. Perdomo
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Phosphorus Removal ◽  
Flow Model ◽  
Hydraulic Retention Time ◽  
Plug Flow ◽  
High Rate ◽  
Initial Concentration ◽  
Ph Values ◽  
Total Nitrogen Removal

This work deals with studies on high-rate ponds, a batch working system that is followed by a filter pond where Chinese carp were introduced for piggery wastes treatment. COD removal values for the high-rate pond were in the order of 95% in the summer and 70% in the winter for an initial concentration of 2000 mg/L. Total nitrogen removal values ranged between 90% and 60%, respectively, in summer and winter periods for an initial concentration of 600 mg/L. Seasonal variations, which are mainly observed under differences of temperature, were shown to be not relevant for total phosphorus removal, a process that appears to depend mainly on increases of pH values over 8.5. An hydraulic retention time ranging between 15 to 20 days was found to be best for pond functioning. The plug flow model fits well to the pond's physical characteristics. The filter pond was shown to be a great potential process for removal of algae produced in the high-rate pond.

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