Novel tapered variable diameter biological fluidized bed for treating pesticide wastewater with high nitrogen removal efficiency and a small footprint

2021 ◽  
Vol 330 ◽  
pp. 124989
Author(s):  
Hui Ge ◽  
Liqiang Yu ◽  
Zhaobo Chen ◽  
Zhiguo Liu ◽  
Hongxia Liu ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
High Nitrogen ◽  
Variable Diameter ◽  
Small Footprint

Study on De-Nitrification of Improved Step-Feed Progress

2014 ◽  
Vol 703 ◽  
pp. 171-174
Author(s):  
Bing Wang ◽  
Yi Xiao ◽  
Shou Hui Tong ◽  
Lan Fang ◽  
Da Hai You ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Operating Conditions ◽  
Removal Mechanism ◽  
Aerobic Zone

Improved step-feed de-nitrification progress combined with biological fluidized bed was introduced in this study. The progress had good performance and capacity of de-nitrification and organic matter. The experiment result showed that the de-nitrification efficiency of the improved biological fluidized bed with step-feed process was higher than the fluidized bed A/O process under the same water quality and the operating conditions. When the influent proportion of each segment was equal, the system showed good nitrogen removal efficiency with the change of influent C/N ratio, HRT and sludge return ratio. The removal rate of TN reached up to 88.2%. It showed that the simultaneous nitrification and de-nitrification phenomenon happened in the aerobic zone. The nitrogen removal mechanism was also studied.

scholarly journals Evaluation of a novel low-carbon to nitrogen- and temperature-tolerant simultaneously nitrifying–denitrifying bacterium and its use in the treatment of river water

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27417-27422 ◽  
Author(s):  
Peng Jin ◽  
Yinyan Chen ◽  
Zhanwang Zheng ◽  
Qizhen Du
Keyword(s):  
Low Temperature ◽  
River Water ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Low Carbon ◽  
High Nitrogen ◽  
Denitrifying Bacterium ◽  
Nitrification And Denitrification

A novel simultaneous nitrification and denitrification Klebsiella sp. exhibits high nitrogen removal efficiency under low-temperature and low C/N wastewater.

scholarly journals Research on Biological Fluidized Bed System Treatment Performance and Nitrogen Removal Process for Seafood Processing Wastewater with Different Operation Conditions

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2630
Author(s):  
Yi Ding ◽  
Hong You ◽  
Wei Sun ◽  
Zhansheng Guo ◽  
Junxue Mei ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Reduction Process ◽  
Nitrite Reduction ◽  
Nitrogen And Phosphorus ◽  
Removal Process ◽  
Operation Conditions ◽  
Nitrification And Denitrification ◽  
Seafood Processing

In this study, the biological fluidized bed system was used to treat seafood processing wastewater. The sludge was collected from the secondary sedimentation tank of a municipal wastewater treatment plant and acclimated for 200 days before the experiment. The treatment efficiencies of simulated seafood processing wastewater by biological fluidized bed system with different sludge concentrations, different hydraulic retention times (HRTs) and different bio-carriers were studied. The results showed that the removal efficiency of nitrogen and phosphorus increased with the increasing sludge concentration and by extending hydraulic retention time, and the higher removal efficiency of nitrogen and phosphorus could be obtained with the higher specific surface area of the bio-carrier. The nitrogen removal process analysis showed that the nitrification and denitrification activity of sludge could be changed with different operation conditions resulting in different nitrogen removal efficiency in the biological fluidized bed system. This was mainly because the change tendency of the ammonia nitrogen oxidizing process, nitrite oxidizing process, nitrite reduction process and nitrate reduction process was different with different operation conditions in a high salinity environment. Theoretically, the difference of the inhibitory effect of a high-salt environment on different nitrification and denitrification processes could be used to realize shortcut nitrification denitrification by controlling a certain operation condition.

scholarly journals Efficiency of Salicornia neei to Treat Aquaculture Effluent from a Hypersaline and Artificial Wetland

Agriculture ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 621
Author(s):  
Mónica R. Diaz ◽  
Javier Araneda ◽  
Andrea Osses ◽  
Jaime Orellana ◽  
José A. Gallardo
Keyword(s):  
South America ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
High Nitrogen ◽  
Artificial Wetlands ◽  
Marine Aquaculture ◽  
Nitrate N ◽  
Ammonium N ◽  
Simulated Concentration

In this study, we evaluated the potential of Salicornia neei, a halophyte plant native to South America, to treat saline effluents with simulated concentration of ammonium-N (Amm) and nitrate-N (Nit) in a similar manner to land-based marine aquaculture effluents. Plants were cultivated for 74 days in drainage lysimeters under three treatments of seawater fertilized with: (1) Nit + Amm, (2) Nit, or (3) without fertilizer (Control). Over five repetitions, nitrogen removal efficiency (RE) was high in both treatments (Nit + Amm = 89.6% ± 1.0%; Nit 88.8% ± 0.9%), whereas the nitrogen removal rate (RR) was nonlinear and concentration-dependent (RRday1–4: Nit + Amm = 2.9 ± 0.3 mg L−1 d−1, Nit = 2.4 ± 0.5 mg L−1 d−1; RRday5–8: Nit + Amm = 0.8 ± 0.2 mg L−1 d−1, Nit = 1.0 ± 0.2 mg L−1 d−1). Effluent salinity increased from 40.6 to 49.4 g L−1 during the experiment, with no observed detrimental effects on RE or RR. High nitrogen removal efficiency and significant biomass production were observed (Nit + Amm = 11.3 ± 2.0 kg m−2; Nit = 10.0 ± 0.8 kg m−2; Control = 4.6 ± 0.6 kg m−2) demonstrate that artificial wetlands of S. neei can be used for wastewater treatment in saline aquaculture in South America.

scholarly journals Efficiency of Salicornia neei to treat aquaculture effluent from a hypersaline and artificial wetland

2020 ◽  
Author(s):  
Mónica R. Diaz ◽  
Javier Araneda ◽  
Andrea Osses ◽  
Jaime Orellana ◽  
José A. Gallardo
Keyword(s):  
South America ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
High Nitrogen ◽  
Artificial Wetlands ◽  
Marine Aquaculture ◽  
Nitrate N ◽  
Ammonium N ◽  
Simulated Concentration

AbstractIn this study we evaluated the potential of Salicornia neei, a halophyte plant native to South America, to treat saline effluents with simulated concentration of ammonium-N (Amm) and nitrate-N (Nit) similar to land-based marine aquaculture effluents. Plants were cultivated for 74 days in drainage lysimeters under three treatments of seawater fertilized with: 1) Nit+Amm, 2) Nit, or 3) without fertilizer (Control). Over 5 repetitions, nitrogen removal efficiency (RE) was high in both treatments (Nit + Amm = 89.6± 1,0 %; Nit 88.8 ± 0.9 %). While nitrogen removal rate (RR) was non linear and concentration-dependent (RRday 1-4: Nit+Amm= 2.9 ± 0.3 mg L−1 d−1, Nit = 2.4 ± 0.5mg L−1 d−1; RRday5-8: Nit + Amm = 0.8 ± 0.2mg L−1 d−1, Nit=1.0 ± 0.2mg L−1 d−1). Effluent salinity increased from 40.6 to 49.4 g L−1 during the experiment, with no observed detrimental effects on RE or RR. High nitrogen removal efficiency and significant biomass production observed, Nit+Amm = 11.3 ± 2.0 kg m−2; Nit = 10.0 ± 0.8 kg m−2; Control = 4.6 ± 0.6 kg m−2, demonstrate that artificial wetlands of S. neei can be used for wastewater treatment in saline aquaculture in South America.

Performance of a partly aerated biofilter in the removal of nitrogen

1996 ◽  
Vol 34 (1-2) ◽  
pp. 187-194 ◽  
Author(s):  
P. C. Chui ◽  
Y. Terashima ◽  
J. H. Tay ◽  
H. Ozaki
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Loading Rate ◽  
Nitrogen Concentration ◽  
Fixed Bed ◽  
Bulk Liquid ◽  
Carbon Oxidation ◽  
High Nitrogen ◽  
Volumetric Loading ◽  
High Nitrogen Concentration

The removal efficiency of nitrogen and organic matter in an anoxic/aerobic upflow fixed bed filter was studied. Tests were carried out on the effects of aeration, hydraulic loading rate, and COD/N ratio on nitrogen removal and carbon oxidation. A synthetic high nitrogen concentration wastewater was used as substrate feed in the study. At an influent concentration of 250 mg N/L, and for volumetric loadings of up to 1 kg N/m3.day, between 41% and 86% of the nitrogen was removed. This was achieved without the recycling of effluent for denitrification. Nitrogen removal was possible when simultaneous denitrification took place inside the support media where oxygen was lacking. COD removal efficiency was consistently above 95% even at a high volumetric loading of 5 kg COD/m3.day and a bulk liquid dissolved oxygen level as low as 1.1 mg/L.

scholarly journals Performance of nitrogen removal in attached growth reactors with different carriers

2017 ◽  
Vol 8 (3) ◽  
pp. 331-339 ◽  
Author(s):  
H. T. Le ◽  
N. Jantarat ◽  
W. Khanitchaidecha ◽  
K. Ratananikom ◽  
A. Nakaruk
Keyword(s):  
Wastewater Treatment ◽  
System Design ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Shock Loading ◽  
Waste Materials ◽  
High Nitrogen ◽  
Attached Growth ◽  
Commercial Reactor ◽  
Wastewater Treatment Systems

Abstract Two waste materials, concrete and sponge, were used as biomass carriers in the attached growth reactor in a nitrogen wastewater treatment system. The nitrogen removal performance was compared to a control reactor using commercial carrier material. The highest nitrogen removal efficiency, 87%, was found in the sponge reactor, with the concrete reactor showing 82% efficiency ahead of the commercial reactor of 76%. A thick biofilm developed on the fiber of the sponge carrier, with the biomass increasing from 270 g-VSS/m3-carrier to 1,000 g-VSS/m3-carrier. For the concrete carrier, biomass was observed on the concrete cracks and also as a biofilm on the surface. The maximal biomass was 630 g-VSS/m3-carrier. The content of the biomass agglomerated in the commercial carrier was 310 g-VSS/m3-carrier. Nitrification and denitrification simultaneously occurred to remove nitrogen in the sponge and the commercial carrier reactor. However, in the concrete reactor, nitrification mainly occurred during the aeration phase and denitrification occurred in the non-aeration phase. These results demonstrate that the sponge was the best carrier, with high nitrogen removal efficiency, dense biomass and tolerance to shock loading. The simplicity inherent in the system design together with good performance make it suitable for use in wastewater treatment systems.

scholarly journals Isolation and characteristic of an aerobic denitrifier with high nitrogen removal efficiency

2011 ◽  
Vol 10 (52) ◽  
pp. 10648-10656 ◽  
Author(s):  
Liang Shu Cheng ◽  
Zhao Min ◽  
Lu Lei ◽  
Wang Chun Lei ◽  
Zhao Li Yan ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
High Nitrogen

Comparative Bio-sorption of Cadmium and Nickel Ions from Aqueous Solution onto Fibers of Date Palm using Fluidized Bed Column

2019 ◽  
Vol 70 (5) ◽  
pp. 1507-1512
Author(s):  
Baker M. Abod ◽  
Ramy Mohamed Jebir Al-Alawy ◽  
Firas Hashim Kamar ◽  
Gheorghe Nechifor
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Fluidized Bed ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Date Palm ◽  
Operating Conditions ◽  
Initial Concentration ◽  
Bed Height

The aim of this study is to use the dry fibers of date palm as low-cost biosorbent for the removal of Cd(II), and Ni(II) ions from aqueous solution by fluidized bed column. The effects of many operating conditions such as superficial velocity, static bed height, and initial concentration on the removal efficiency of metal ions were investigated. FTIR analyses clarified that hydroxyl, amine and carboxyl groups could be very effective for bio-sorption of these heavy metal ions. SEM images showed that dry fibers of date palm have a high porosity and that metal ions can be trapped and sorbed into pores. The results show that a bed height of 6 cm, velocity of 1.1Umf and initial concentration for each heavy metal ions of 50 mg/L are most feasible and give high removal efficiency. The fluidized bed reactor was modeled using ideal plug flow and this model was solved numerically by utilizing the MATLAB software for fitting the measured breakthrough results. The breakthrough curves for metal ions gave the order of bio-sorption capacity as follow: Cd(II)]Ni(II).

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