• Carbon letters
• /
• v.11 no.2
• /
• pp.112-116
• /
• 2010

The objective of this study was to evaluate the possibility of simultaneous removal of ammonium, nitrate and phosphorus in water using the zeocarbon. In this study, the surface of zeocarbon was modified by acid because of difficulty in application of water treatment. After surface modification, the strength was enhanced about 62% higher than that of original one. The removal efficiency of ammonium and nitrate using the modified zeocarbon was about 47% and 32%, respectively and were higher than that of zeocarbon. In batch type experiment on the simultaneous removal of ammonium, nitrate and phosphorus, the presence of phosphorus did not have influence on nitrogen removal efficiency. Concomitantly, removal efficiency of phosphorus was obtained was about 35%. This indicates that the surface modified zeocarbon can be applied for simultaneous removal of nitrogen and phosphorus. Consequently, our results could be used as basic data to design of one-stage nitrogen/phosphorus simultaneous removal system.

• Journal of the Korea Organic Resources Recycling Association
• /
• v.24 no.1
• /
• pp.59-63
• /
• 2016

The objective of this study lies in identifying the applicability of zeolite for the removal of wastewater ammonium and nitrate nitrogens. To this end, the author tracked adsorption variations as seen with the adsorption removal of wastewater ammonium and nitrate nitrogens. As a result, it was indicated that the maximum adsorption of zeolite acting on the adsorption removal of ammonium nitrogen would reach 120mg/g (weight of ammonium nitrogen divided by that of zeolite), and that Langmuir adsorption isotherm explained the adsorption of ammonium and nitrate nitrogens better than Freundlich adsorption isotherm. This means that zeolite makes ion exchanges with adsorbate for unilayer adsorption. It was also indicated that the removal efficiency of ammonium nitrogen with varying pH would be higher in the order of pH7 > pH5 > pH9 > pH3.

• Bulletin of the Korean Chemical Society
• /
• v.23 no.10
• /
• pp.1477-1480
• /
• 2002

• Journal of Korean Society of Environmental Engineers
• /
• v.27 no.1
• /
• pp.109-114
• /
• 2005

The objective of this study is to investigate the possibility for water treatment, and to evaluate the efficiency of simultaneous removal of ammonium and nitrate by the surface modified zeocarbon. The surface modification was done by acid treatment using HCl. As a result of modification, strength of the modified zeocarbon was enhanced about 62% higher than that of in original one. This indicates that the modified zeocarbon was suitable for the application of water treatment. In the removal experiments of ammonium and nitrate, the removal efficiency showed about two times higher in the modified zeocarbon and the dependences of pH and temperature were found to be minimized. This indicates that the modified zeocarbon was effective for simultaneous removal of ammonium and nitrate from aqueous solution. Consequently, our results could be used as basic data to design of one-stage ammonium/nitrate simultaneous removal system.

• Journal of Microbiology and Biotechnology
• /
• v.2 no.4
• /
• pp.255-259
• /
• 1992

The effect of nitrate, nitrite and ammonia as inorganic nitrogen sources on the modulation of nitrogen metabolism of Botryococcus braunii UTEX.-572 has been studied under aeration. The primary process in the regulation of nitrogen metabolism by this alga has the nitrate uptake system. This uptake of nitrate operation was immediately inhibited by the presence of 0.5 mM of ammonium and reversed by 0.2∼0.3 mM ammonium. When cell were exposed to 5 mM of ammonium for 24 hours the activity of nitrate reductase became inactive.

• Journal of the Korean Applied Science and Technology
• /
• v.34 no.2
• /
• pp.289-295
• /
• 2017

The International Maritime Organization (IMO) in accordance with the regulations with respect to the combustion gases, such as NOx, SOx generated by the marine engine. The combustion gases must be equipped with a device to reduce emissions from all ships passing through the Baltic SECAs. In Korea, the International Maritime Organization (IMO) and the development of a device for NOx, SOx reduction. Scrubber is used in the ammonia water and the Urea solution in the waste water. The waste water containing ammonium nitrate and ammonium sulfate, react of the NOx and SOx gas. In this study, the recovery of by-product, which contains the waste water was used as an organic solvent extraction method of salting out. Ammonium nitrate and ammonium sulfate, the recovery process. A qualitative analysis of the collected by-product FT-IR analysis. Through the elemental analysis and SEM-EDS, characteristic evaluation was performed with an impurity.

• Journal of Microbiology and Biotechnology
• /
• v.17 no.8
• /
• pp.1254-1261
• /
• 2007

In the present study, we have constructed a bioluminescent bioreporter for the assessment of nitrate/nitrite bioavailability in wastewater. Specifically, an approximately 500-bp DNA fragment containing a nitrate/nitrite-activated nasR-like promoter (regulating expression of genes encoding nitrite reductase in the genus Klebsiella) was fused upstream of the Vibrio fischeri luxCDABE gene cassette in a modified mini-Tn5 vector. Characterization of this strain, designated W6-1, yielded dose-dependent increased bioluminescence coincident with increased nitrate, nitrite, and ammonium added to the growth medium from 1 to 11 ppm. Bioluminescence in response to nitrogen species addition was light dependent up to 10, 7, and 8 ppm with nitrate, nitrite, and ammonium, respectively. This response was linear in the range from 1 to 8 ppm for nitrate ($R^2=0.98$), 1 to 6 ppm for nitrite ($R^2=0.99$), and 1 to 7 ppm for ammonium ($R^2=0.99$). A significant bioluminescent response was also recorded when strain W6-1 was incubated with slurries from aged, nitrate/nitrite contaminated wastewater. Thus, bioreporter strain W6-1 can be used to elucidate factors that constrain the use of nitrate/nitrite in wastewaters.

• Journal of Microbiology and Biotechnology
• /
• v.26 no.11
• /
• pp.1965-1971
• /
• 2016

Livestock wastewater containing high concentrations of ammonium and nitrate ions was pretreated with microbubbles and an Fe/MgO catalyst prior to its application in microbial fuel cells because high ion concentrations can interfere with current generation. Therefore, tests were designed to ascertain the effect of pretreatment on current generation. In initial tests, the optimal amount of catalyst was found to be 300 g/l. When 1,000 ml/min $O_2$ was used as the oxidant, the removal of ammonium- and nitrate-nitrogen was highest. After the operating parameters were optimized, the removal of ammonium and nitrate ions was quantified. The maximum ammonium removal was 32.8%, and nitrate was removed by up to 75.8% at a 500 g/l catalyst concentration over the course of the 2 h reaction time. The current was about 0.5 mA when livestock wastewater was used without pretreatment, whereas the current increased to $2.14{\pm}0.08mA$ when livestock wastewater was pretreated with the method described above. This finding demonstrates that a 4-fold increase in the current can be achieved when using pretreated livestock wastewater. The maximum power density and current density performance were $10.3W/m^3$ and $67.5W/m^3$, respectively, during the evaluation of the microbial fuel cells driven by pretreated livestock wastewater.

• Korean Journal of Plant Tissue Culture
• /
• v.25 no.1
• /
• pp.57-61
• /
• 1998

Soybean and tobacco tissue cultured with modified MS media containing 4 different ratio(as N) of nitrate to ammonium combination which were 3:0, 2:1, 1:2 and 0:3. The highest callus growth in soybean were observed in the 2:1 medium. The medium containing nitrate only was detrimental to soybean callus growth. Tobacco callus grown with nitrate-only grew as well as those in the 2:1 and very slowly with ammonium-only. In tobacco callus, the total nitrogen in the callus increased with the increase of nitrogen concentration in the medium, but in soybean callus, the opposite result was noted. Nitrate reductase activity in tobacco callus was high when grown with nitrate-only but low with ammonium-only. In case of soybean callus, nitrate reductase activity was high in the 2:1 and remarkably low in nitrate-only medium. Both in soybean and tobacco callus, the activity of glutamine synthetase was high with nitrate-only, but low with ammonium.

• Bulletin of the Korean Chemical Society
• /
• v.30 no.12
• /
• pp.3120-3122
• /
• 2009