scholarly journals Nitrate Removal from Wastewater through Biological Denitrification with OGA 24 in a Batch Reactor

Water ◽  
2014 ◽  
Vol 7 (12) ◽  
pp. 51-62 ◽  
Author(s):  
Federico Rossi ◽  
Oriana Motta ◽  
Simona Matrella ◽  
Antonio Proto ◽  
Giovanni Vigliotta
Keyword(s):  
Batch Reactor ◽  
Nitrate Removal ◽  
Biological Denitrification

scholarly journals Evaluation of a pilot plant for removal of nitrate from groundwater using ion exchange and recycled regenerant

2017 ◽  
Vol 12 (3) ◽  
pp. 541-548
Author(s):  
Sheldon Tarre ◽  
Michael Beliavski ◽  
Michal Green
Keyword(s):  
Ion Exchange ◽  
Batch Reactor ◽  
Nitrate Removal ◽  
Bacterial Count ◽  
Water Volume ◽  
Foam Fractionation ◽  
Well Water ◽  
Combined System ◽  
Blow Down ◽  
Product Water

A combined system of ion exchange (IX) and advanced biophysical treatment of a recirculating regenerant was tested for nitrate removal from groundwater with minimal brine discharge and chloride addition to the product water. Using well water containing 21.5 ± 1.4 mg NO3−-N/L, optimal IX operation was found at a service cycle of 500 bed volumes (BV). Product water nitrate concentrations (7.4 ± 1.4 mg/L as N) met regulations while minimizing both Cl− addition to the treated water (1.03 meq Cl− added per meq NO3−-N removed) and waste brine production (0.2% of the water volume treated). The total organic carbon in the product water was slightly higher (1.5 ± 0.5 vs. 1.3 ± 0.4 mg/L) than the well water and before disinfection the bacterial count was 10–700 cfu/ml. Brine used to regenerate the IX columns was treated first in a sequential batch reactor (SBR) for biological denitrification followed by ozonation for polishing. The SBR was operated at 8 hour cycles and achieved complete nitrate removal. An ozone dose of 3 to 5 mg/L brine allowed for efficient recycling of the denitrified regenerant by removing suspended solids by foam fractionation. In spite of the low brine blow-down, DOC in the recycled regenerant brine after a year of continuous operation was maintained at relatively low levels of 61.0 ± 11.6 mg/L.

scholarly journals Impact of Temperature on Biological Denitrification Process

1970 ◽  
Vol 7 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Iswar Man Amatya ◽  
Bhagwan Ratna Kansakar ◽  
Vinod Tare ◽  
Liv Fiksdal
Keyword(s):  
Filtration Rate ◽  
Nitrate Nitrogen ◽  
Nitrate Removal ◽  
Biological Method ◽  
Biological Denitrification ◽  
Nitrite Nitrogen ◽  
Nitrogen Concentrations ◽  
In Series ◽  
Nitrate And Nitrite ◽  
Denitrification Process

Nitrate removal in groundwater was carried out by biological method of denitrification process. The denitrification and without denitrification were performed in two different sets of reactors. Each reactor consists of two columns connected in series packed with over burnt bricks as media. The filtration rate varied from 5.3 to 52.6 m/day for denitrification process. The ammonia, nitrate and nitrite nitrogen concentrations were measured at inlet, intermediate ports and outlet. The temperature varied from 10 to 30°C at 2°C intervals. The results demonstrated that high amount of nitrate nitrogen removed in groundwater at denitrification process. The nitrate nitrogen removed by denitrification varied from 3.50 to 39.08 gm/m3/h at influent concentration from 6.32 to 111.04 gm/m3/h. Denitrification was found more significant above 16°C.Key words: Over burnt brick, Denitrification, Filtration rate and TemperatureJournal of the Institute of Engineering, Vol. 7, No. 1, July, 2009 pp. 121-126doi: 10.3126/jie.v7i1.2070 

Denitrification with isopropanol as a carbon source in a biofilm system

1994 ◽  
Vol 30 (11) ◽  
pp. 69-78 ◽  
Author(s):  
Yongwoo Hwang ◽  
Hiroshi Sakuma ◽  
Toshihiro Tanaka
Keyword(s):  
Carbon Source ◽  
Nitrate Removal ◽  
Growth Yield ◽  
Pilot Scale ◽  
Denitrification Rate ◽  
Hydrogen Donor ◽  
Microbial Oxidation ◽  
Biological Denitrification ◽  
Batch Tests

Several batch tests and pilot-scale investigations on biological denitrification with isopropanol were performed. Isopropanol was converted to acetone by microbial oxidation during denitrification. Isopropanol itself little contributed to denitrification in practice while the converted acetone played a role of a main hydrogen donor. A larger quantity of nitrite intermediate was formed by using methanol compared to the case of isopropanol. The measured requirement of isopropanol was 2.0 mg mg−1 NO3-N, and was 2/3 of methanol. The oxygen equivalent of isopropanol for nitrate removal was almost the same as that of methanol. The denitrifier net growth yield for isopropanol was greater than for methanol. In order to maximize the denitrification rate, it is essential to convert isopropanol to acetone rapidly by accurate dosing for nitrogen load because the denitrification rate was accelerated by using acetone only. Excessive dose of isopropanol can cause a decrease in the denitrification rate as well as an increase of BOD in the effluent.

Biological denitrification in a continuous flow membrane reactor

1998 ◽  
Vol 38 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Bruce O. Mansell ◽  
Edward D. Schroeder
Keyword(s):  
System Performance ◽  
Continuous Flow ◽  
Membrane Reactor ◽  
Pore Diameter ◽  
Molecular Diffusion ◽  
Nitrate Removal ◽  
Average Pore ◽  
Membrane Area ◽  
Biological Denitrification ◽  
Approximate System

Biological denitrification in a continuous flow membrane reactor has been investigated. The nitrate-laden water treated was separated from a suspended denitrifying culture by a 0.02 μm average pore diameter membrane. Equal pressure was maintained across the membrane and nitrate was removed by molecular diffusion through the membrane and into the denitrifying culture. A nitrate removal efficiency of approximately 90% or a flux of 4 g NO3−-N/m2/d of membrane area was achieved with an influent concentration of 20 mg/L NO3−-N. A mathematical model was developed to approximate system performance. Predicted effluent concentrations for the experiments conducted were 5.7, 9.5, 11.7, and 17.6 mg/L NO3−-N. The respective measured effluent concentrations were 2.3, 6.0, 9.0, and 16.0 mg/L NO3−-N.

scholarly journals Denitrification Kinetics of Nitrate by a Heterotrophic Culture in Batch and Fixed-Biofilm Reactors

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 547
Author(s):  
Yen-Hui Lin ◽  
Yi-Jie Gu
Keyword(s):  
Continuous Flow ◽  
Nitrate Concentration ◽  
Batch Reactor ◽  
Nitrate Removal ◽  
Biofilm Reactor ◽  
Experimental Results ◽  
Heterotrophic Culture ◽  
Concentration Data ◽  
Water And Wastewater Treatment ◽  
Fixed Biofilm

Herein, the progress of nitrate removal by a heterotrophic culture in a batch reactor and continuous-flow fixed-biofilm reactor was examined. Two batch experiments for nitrate reduction with acetate degradation using 250 mL batch reactors with acclimated denitrifying biomass were conducted. The experimental results indicated that the nitrate was completely reduced; however, the acetate remained at a concentration of 280 mg/L from initial nitrate concentration of 100 mg/L. However, the acetate was fully biodegraded by the denitrifying biomass at an initial nitrate concentration of 300 mg/L. To evaluate the biokinetic parameters, the concentration data of nitrate, nitrite, acetate, and denitrifying biomass from the batch kinetic experiments were compared with those of the batch kinetic model system. A continuous-flow fixed-biofilm reactor was used to verify the kinetic biofilm model. The removal efficiency of nitrate in the fixed-biofilm reactor at the steady state was 98.4% accompanied with 90.5% acetate consumption. The experimental results agreed satisfactorily with the model predictions. The modeling and experimental approaches used in this study could be applied in the design of a pilot-scale, or full-scale, fixed-biofilm reactor for nitrate removal in water and wastewater treatment plants.

Biological Denitrification of High Concentration of Nitrate in Batch Reactor

2018 ◽  
Vol 19 (5) ◽  
pp. 406-413
Author(s):  
Jeongdong Choi ◽  
Doo Sik Choi ◽  
Jea Seok Song ◽  
Byung Yeol Cho
Keyword(s):  
Batch Reactor ◽  
High Concentration ◽  
Biological Denitrification

Biological denitrification in a sequencing batch reactor

2004 ◽  
Vol 50 (10) ◽  
pp. 67-72 ◽  
Author(s):  
P. Dangcong ◽  
W. Yi ◽  
W. Hao ◽  
W. Xiaochang
Keyword(s):  
Sequencing Batch Reactor ◽  
Loading Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Filamentous Bacteria ◽  
Microscope Examination ◽  
Biological Denitrification ◽  
Effective Technology ◽  
Nitrate And Nitrite ◽  
Electronic Microscope

Biological denitrification was studied in an SBR to investigate the performance. The experimental results showed that granular sludge with high activity and good settling ability can be developed smoothly in the reactor. With the granular sludge, high nitrate loading rate (0.48 kg NO3-N dm−3 d−1) and removal efficiency (more than 99%) can be achieved. Scanning electronic microscope examination showed that only rod-shape bacteria existed on and within the granules, which confirmed indirectly that filamentous bacteria do not utilize nitrate and nitrite as electron acceptors. SBR is an alternative and effective technology for biological denitrification.

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