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 

scholarly journals Role of pH on biological Nitrification Process

1970 ◽  
Vol 8 (1-2) ◽  
pp. 119-125 ◽  
Author(s):  
Iswar Man Amatya ◽  
Bhagwan Ratna Kansakar ◽  
Vinod Tare ◽  
Liv Fiksdal
Keyword(s):  
Filtration Rate ◽  
Ammonia Oxidation ◽  
Ammonia Nitrogen ◽  
Microbial Kinetics ◽  
Nitrification Process ◽  
Nitrogen Concentrations ◽  
In Series ◽  
Biological Nitrification ◽  
Oxidation Efficiency ◽  
Nitrate And Nitrite

It is important to determine the effect of changing environmental conditions on the microbial kinetics for design and modeling of biological treatment processes. In this research, the kinetics of ammonia oxidation by nitrifying process bacteria under varying pH and temperature conditions are studied. Ammonia oxidation in groundwater was carried out by biological method of nitrification process. The nitrification was performed in one set of reactors. The reactor consists of two columns connected in series packed with over burnt bricks as media. The filtration rate varied from 10.5 to 210.4 m/day for nitrification process respectively. 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 amounts of ammonia nitrogen nitrified in groundwater at nitrification process. The average ammonia nitrogen oxidation efficiency of 77.27% was achieved from pH 7.3 to 8.0 in the reactor packed with OBB media at 20°C, for the flow rate 500ml/min due to biological nitrification. The total amount of ammonia nitrogen removed by nitrification varied from 0.76 to 17.80 gm/m3/h at influent concentration from 2.84 to 149.28 gm/m3/h.Key words: Over burnt brick; Filtration rate; Temperature; Nitrification and Nitrifying bacteriaDOI: http://dx.doi.org/10.3126/jie.v8i1-2.5102Journal of the Institute of Engineering Vol. 8, No. 1&2, 2010/2011Page: 119-125Uploaded Date: 20 July, 2011

Nitrate removal from groundwater using an anoxic-aerobic rotating biological contactor

1996 ◽  
Vol 34 (1-2) ◽  
pp. 323-330 ◽  
Author(s):  
A. Mohseni-Bandpi ◽  
D. J. Elliott
Keyword(s):  
Organic Carbon ◽  
Nitrate Nitrogen ◽  
Nitrate Removal ◽  
Carbon Sources ◽  
Optimum Conditions ◽  
Rotating Biological Contactor ◽  
Nitrite Nitrogen ◽  
In Series ◽  
Rotating Biological Contactors ◽  
Final Effluent

The removal of nitrate-nitrogen from groundwater was investigated using two rotating biological contactors (RBC) in series. The first pilot plant RBC reactor was operated under anoxic condition to remove nitrate-nitrogen. A fraction of effluent of the anoxic RBC was fed to a bench scale aerobic RBC to study the degradation of residual organic carbon and oxidation of nitrite-nitrogen. The first reactor achieved a nitrate removal efficiency of 90 percent for a loading rate of 76 mg/m2.h. The corresponding effluent nitrate, nitrite and residual carbon sources concentrations amounted to 3.3, 0.34 and 3.9 mg/l, respectively. The optimum ethanol to nitrate-nitrogen (E/N) ratio was found to be 2.35. No residual ethanol and nitrite-nitrogen were observed in the final effluent under optimum conditions. Dissolved oxygen in the final effluent was found to be greater than 7 mg/l. The results of the study suggest that using a continuous anoxic-aerobic RBC is a convenient and reliable process for removal of nitrate, residual organic carbon and nitrite.

Experimental effect of medium ratio on removal efficiency of nitrate nitrogen in groundwater by zero-valent iron, activated carbon and zeolite

2019 ◽  
Vol 19 (6) ◽  
pp. 1636-1642
Author(s):  
Sizhi Cao ◽  
Peigui Liu ◽  
Mingchao Liu ◽  
Gang Wang ◽  
Zaili Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Nitrate Removal ◽  
Ammonia Nitrogen ◽  
Coarse Sand ◽  
Zero Valent Iron ◽  
Nitrite Nitrogen ◽  
Rich Solution ◽  
Set Up

Abstract In this study, column experiments in the laboratory were set up to examine how the concentrations of nitrate nitrogen, nitrite nitrogen, and ammonia nitrogen changed when a nitrate-rich solution was passed through a medium comprising zero-valent iron, activated carbon, zeolite, and coarse sand. We varied the proportions of the components of the medium to determine how it influenced the nitrate removal and nitrogen fractions. Three different scenarios were used, with: (1) iron, activated carbon, and coarse sand at a ratio of 3:1:6; (2) iron, activated carbon, and zeolite at a ratio of 3:1:6; and (3) iron, activated carbon, and zeolite at a ratio of 3:3:4. The nitrate nitrogen concentration decreased from 25 mg/L to 2 mg/L in the first scenario. Removal was better when zeolite was added to the medium as most of the nitrate nitrogen broke down to ammonia nitrogen, with nitrite nitrogen as an intermediate product. The results of the tests showed that nitrate removal was best when the medium was iron, activated carbon, and zeolite, mixed at a ratio of 3:1:6. This study provides a scientific reference for in situ remediation of nitrate pollution in groundwater.

scholarly journals Effect of Denitrifying Bacterial Biomass and Carbon Sources on Nitrate Removal

2020 ◽  
Vol 14 (4) ◽  
pp. 2417-2424
Author(s):  
Essam J. Alyamani ◽  
Rayan Y. Booq ◽  
Ali H. Bahkali ◽  
Sulaiman A. Alharbi
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carbon Source ◽  
Conventional Treatment ◽  
Nitrate Removal ◽  
Carbon Sources ◽  
Bacterial Biomass ◽  
Alkaline Ph ◽  
Biological Denitrification ◽  
Bacterial Inoculum ◽  
Denitrification Process

Denitrification based on immobilized microbial cellulose may offer an economical replacement for conventional treatment for nitrate removal. The environmental and bacterial biomass may influence the rate of biological denitrification processes. This study aimed to investigate the factors that affect denitrification rates, including carbon sources, pH, and bacterial inoculum. Different inoculum biomass of Pseudomonas aeruginosa and various carbon sources of glucose, sucrose, and cellulose with different concentrations were tested to assimilate 100 mg/L of KNO3 as nitrate source. Additionally, five additional inoculations, five different incubation time, and seven different pH levels were studied. The Pseudomonas aeruginosa isolates used different mineral media with three carbon sources, glucose, sucrose, and cellulose, with different concentrations at different rates to denitrify nitrate. The highest denitrification rate was with glucose after 18 hrs and was after 24 hrs when sucrose and cellulose were used, respectively. The bacterial biomass denitrification level was the highest, between 0.8% and 1% of OD600=1. Nitrate removal by Pseudomonas aeruginosa was the highest at pH 7, 8, and 9. This report suggests that when glucose is used as a carbon source, at neutral to alkaline pH, and 1% of denitrifying bacterial biomass, the highest level of biological denitrification process may be achieved.

Fluctuations in available mineral nitrogen in a flooded rice soil on the sub-coastal plains of the Adelaide river, N.T

1969 ◽  
Vol 9 (40) ◽  
pp. 532 ◽  
Author(s):  
RW Strickland
Keyword(s):  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
Mineral Nitrogen ◽  
Rice Soil ◽  
Nitrogen Levels ◽  
Growing Period ◽  
Flooded Rice ◽  
Nitrite Nitrogen ◽  
Flooded Rice Soil ◽  
Nitrate And Nitrite

Soil from the 0-3 inch and 3-12 inch layers of nitrogen fertilized and unfertilized cropped and fallow plots was sampled at two=weekly intervals throughout the growing period of flooded rice. The soil was extracted with sodium acetate-acetic acid (pH 4.8) and ammonium, nitrate, and nitrite nitrogen determined. Nitrite nitrogen levels fell from 0.4 p.p.m. before flooding to less than 0.1 p.p.m. after flooding. Ammonium nitrogen reached peak mean levels of 57 and 55 lb an acre in the surface 12 inches of the soil in fertilized and unfertilized plots respectively, eight weeks after flooding. The effect of added nitrogen was lost within four weeks of flooding. Nitrate nitrogen in the surface 12 inches of soil reached peak levels of 40 and 10 lb an acre two weeks before flooding and 28 and 25 lb an acre eight weeks after flooding in fertilized and unfertilized plots respectively. Changes in the levels of available mineral nitrogen are discussed in relation to soil pH, Eh, and temperature

scholarly journals Non-Parametric Analysis of Nitrogen Trends in the form of Nitrate and Nitrite in Rivers and Streams of the Contiguous United States for 1990-2019

2021 ◽  
Author(s):  
Amin Mohebbi ◽  
Simin Akbariyeh
Keyword(s):  
United States ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Surface Flow ◽  
Nitrogen Levels ◽  
Nitrite Nitrogen ◽  
Rivers And Streams ◽  
Nitrate And Nitrite ◽  
Type Ii Errors ◽  
Non Parametric

Nitrogen and phosphorous support the ecosystem by supplying nutrients to algae and aquatic plants. Having them in excess results in the eutrophication of waters creating quality problems. In the past, nitrogen has been widely investigated for wells in the context of groundwater flow. However, a national-scale nitrogen assessment in rivers and streams has not received enough attention. In this research, the Wilcoxon rank sum test, as a non-parametric hypothesis testing method, has been applied to nitrogen concentration in the form of nitrate-nitrogen and nitrite-nitrogen in rivers and streams of the Contiguous United States. This approach was particularly selected because of the non-normal and positively skewed nitrogen levels occurring in the surface flow. This method was able to identify the impaired body of waters as well as quantify the confidence, significance, and errors involved. The Northern Appalachians (NAP), Northern Plains (NPL), and Xeric (XER) ecoregions were worsening in the nitrogen-nitrate condition with NAP, and XER needed immediate actions. The nitrite-nitrogen condition did not pose an immediate threat, so mitigation plans should focus more on nitrate-nitrogen remediation. It was shown that the method was superior to the two-sample t-test by yielding lower type II errors.

Long-term stability of biological denitrification process for high strength nitrate removal from wastewater of uranium industry

2008 ◽  
Vol 27 (3) ◽  
pp. 365-372 ◽  
Author(s):  
Prashant M. Biradar ◽  
Pradip B. Dhamole ◽  
Rashmi R. Nair ◽  
S.B. Roy ◽  
S.K. Satpati ◽  
...  
Keyword(s):  
Nitrate Removal ◽  
High Strength ◽  
Term Stability ◽  
Long Term Stability ◽  
Biological Denitrification ◽  
Uranium Industry ◽  
Denitrification Process

scholarly journals BIOLOGICAL NITROGEN REMOVAL FROM WASTEWATER IN COLD PERIOD / BIOLOGINIS AZOTO JUNGINIŲ ŠALINIMAS IŠ NUOTEKŲ ŠALTUOJU LAIKOTARPIU

2016 ◽  
Vol 8 (4) ◽  
pp. 468-474
Author(s):  
Skaistė Paulionytė ◽  
Aušra Mažeikienė
Keyword(s):  
Wastewater Treatment ◽  
Natural Environment ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Winter Period ◽  
Entire Study ◽  
Nitrite Nitrogen ◽  
Nitrogen Concentrations

Today the number of individual wastewater treatment plants in the country is increasing. Popular are biological treatment, activated sludge-based operating units. There are almost no data on how the wastewater disposed of nitrogen compounds, especially in the cold (winter) period. The article analyzes the small domestic wastewater treatment plant AT-6 available in the main clean-up indicators (pH, T, SS, BOD7, nitrate nitrogen, nitrite nitrogen, ammonia nitrogen concentrations). The investigation period as the AT-6 type device treated wastewater in line with the general requirements of the natural environment, effluents (depending on the temperature, odor, pH, and SS, BOD7 concentrations). Nitrate nitrogen and nitrite nitrogen concentrations in the effluent of the device did not exceed the requirements into the natural environment effluents. Ammonium nitrogen concentration in the treated wastewater the entire study period exceeded requirements (5 m. / l) of the discharge into the natural environment. It should be more research during the cold months to confirm this. Šiandien individualių buitinių nuotekų valymo įrenginių skaičius šalyje vis didėja. Populiarūs biologinio valymo veikliojo dumblo pagrindu veikiantys įrenginiai. Beveik nėra duomenų, kaip iš nuotekų šalinami azoto junginiai, ypač šaltuoju (žiemos) laikotarpiu. Straipsnyje analizuojami mažu buitinių nuotekų biologinio valymo įrenginiu AT-6 pasiekiami pagrindiniai išvalymo rodikliai (pH, temperatūra, SM, BDS7, nitratų azoto, nitritų azoto, amonio azoto koncentracijos). Tyrimų laikotarpiu AT-6 tipo įrenginiu išvalytos nuotekos atitiko bendruosius reikalavimus į gamtinę aplinką išleidžiamoms nuotekoms (pagal temperatūrą, kvapą, pH, SM ir BDS7 koncentracijas). Nitratų azoto ir nitritų azoto koncentracijos įrenginio ištakyje neviršijo reikalavimų į gamtinę aplinką išleidžiamoms nuotekoms. Amonio azoto koncentracija išvalytose nuotekose visą tyrimo laikotarpį viršijo reikalavimus (5 mg/l) išleidžiant nuotekas į gamtinę aplinką. Reikėtų atlikti daugiau tyrimų šaltuoju metų laikotarpiu rezultatams patvirtinti.

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