scholarly journals Effect of pH and nitrite concentration on nitrite oxidation rate

2011 ◽  
Vol 102 (19) ◽  
pp. 8741-8747 ◽  
Author(s):  
E. Jiménez ◽  
J.B. Giménez ◽  
M.V. Ruano ◽  
J. Ferrer ◽  
J. Serralta
Keyword(s):  
Oxidation Rate ◽  
Nitrite Oxidation ◽  
Nitrite Concentration ◽  
Effect Of Ph

Effect of pH, substrate and free nitrous acid concentrations on ammonium oxidation rate

2012 ◽  
Vol 124 ◽  
pp. 478-484 ◽  
Author(s):  
E. Jiménez ◽  
J.B. Giménez ◽  
A. Seco ◽  
J. Ferrer ◽  
J. Serralta
Keyword(s):  
Oxidation Rate ◽  
Nitrous Acid ◽  
Ammonium Oxidation ◽  
Free Nitrous Acid ◽  
Effect Of Ph

Nitrite oxidation inhibition by hydroxylamine: experimental and model evaluation

2004 ◽  
Vol 50 (6) ◽  
pp. 295-304 ◽  
Author(s):  
P. (Lek) Noophan ◽  
L.A. Figueroa ◽  
J. Munakata-Marr
Keyword(s):  
Oxidation Rate ◽  
Biological Nitrogen Removal ◽  
Ammonia Oxidizers ◽  
Batch Experiments ◽  
Nitrite Oxidation ◽  
Ph Values ◽  
Initial Ph ◽  
Nitrogen Concentrations ◽  
Biological Nitrogen ◽  
Nitrite Oxidizers

A proposed approach for biological nitrogen removal significantly reduces cost by reducing biomass production and carbon requirements via inhibition of nitrite oxidation (NO2− to NO3−). Batch experiments were conducted to examine the effect of hydroxylamine (HM) on nitrite oxidizers, ammonia oxidizers, and nitrite reducers. Hydroxylamine effect experiments were done at initial pH values of 7.4-8.4, nitrogen concentrations of 100 mg N/L, biomass concentrations of 100-400 mg VSS/L and HM dosages up to 43 mg/L. Nitrite oxidizer activity was completely inhibited by HM at dosages of 7.0 and 8.9 mg/L for pH values of 8.4 and 7.6, respectively. Relatively low HM concentrations (0.35-5.5 mg/L) can be used to completely inhibit nitrite oxidation, but do not significantly affect ammonia oxidizers and nitrite reducers. A model developed to describe the effect of pH on nitrite oxidation rate fits the data well (R2 = 0.89) with values for Vmax of 0.372 (mg N/mg VSS-hr), pH* of 7.72, and the inhibition constant Kh of 0.154. Incorporation of HM inhibition into the model provided a good fit to relative nitrite oxidation rate as a function of undissociated HM concentration (R2 = 0.80, Vmax = 0.028 mg N/mg VSS-hr, pH* = 7.89, Kh * 0.302, a * 0.195, and Ki = 0.277 mg/L).

scholarly journals Effects of the chemical characteristics and concentration of inorganic suspended solids on nitrification in freshwater

2017 ◽  
Vol 76 (11) ◽  
pp. 3101-3113
Author(s):  
Quynh Nga Le ◽  
Chihiro Yoshimura ◽  
Manabu Fujii
Keyword(s):  
Clay Minerals ◽  
Rate Constants ◽  
Oxidation Rate ◽  
Suspended Solids ◽  
Nitrification Rate ◽  
Chemical Characteristics ◽  
Ammonium Oxidation ◽  
Nitrite Oxidation ◽  
Oxidation Rate Constant ◽  
Positive Effect

Abstract The effect of inorganic suspended solids (ISS) on nitrification in freshwater samples has been described inconsistently and remains unclear. This study therefore investigated the effects of the chemical characteristics and concentration of ISS on the nitrification rate by focusing on Nitrosomonas europaea and Nitrobacter winogradskyi as the two most dominant nitrification species in freshwater. Batch-wise experiments were conducted using three chemically well-characterized ISS (i.e. the clay minerals montmorillonite, sericite, and kaolinite in the concentration range 0–1,000 mg L−1). The results show that the ammonium oxidation rate constant (kNH4) was significantly affected by the ISS type, whereas changes in the ISS concentration had an insignificant effect on kNH4, except for kaolinite. The highest kNH4 was observed in samples containing sericite (kNH4, 0.067 L mg−1 day−1), followed by samples containing montmorillonite (kNH4, 0.044 L mg−1 day−1). The ammonium oxidation rate was low in the control and kaolinite samples. Nitrite oxidation was enhanced in the presence of all types of ISS. The rate constants of ISS-mediated nitrite oxidation (kNO2, 0.13–0.21 L mg−1 day−1) were not significantly different among the three types of ISS, but kNO2 was significantly affected by ISS concentration. Overall, our study indicated various effects of the ISS type and concentration on nitrification and, in particular, a notable positive effect of sericite.

scholarly journals The Effect of Stocking Density on Nitrification Rate in a Closed Recirculating Culture System

2007 ◽  
Vol 1 (2) ◽  
pp. 47 ◽  
Author(s):  
A.S. Sidik ◽  
, Sarwono ◽  
, Agustina
Keyword(s):  
Common Carp ◽  
Cyprinus Carpio ◽  
Oxidation Rate ◽  
Water System ◽  
Stocking Density ◽  
Nitrification Rate ◽  
Nitrite Oxidation ◽  
Common Carp Cyprinus Carpio ◽  
Carp Cyprinus Carpio ◽  
Recirculating Water System

<p>ABSTRACT</p><p>Nitrification rate in a closed recirculating water system with different stocking density of common carp (Cyprinus carpio L.) had been observed in the Laboratory of Aquaculture, Faculty of Fisheries and Marine Science, Mulawarman University.   Fish were cultivated  in rounded tanks with four level of stocking densities i.e. 10, 20, 30 and 40 fish/100 l in a closed recirculting water system, and fed on a commercial pellet given thrice a day at a quantity of 5% from the total body weight of fish per day.  The experiment was designed completely randomized with three replications. Nitrification rate was calculated stoichiometrically through the determination of  ammonia and nitrite oxidation rate. Results showed that in this experiment the ammonia and nitrite oxidation rate, and nitrification rate in a closed recirculating water system was increased with the increasing stocking density of fish.   On the contrary, the growth of fish was decreased with the increasing of stocking density.</p><p>Key words :  Nitrification rate, stocking density, recirculation system, common carp (Cyprinus carpio L.).</p><p> </p><p>ABSTRAK</p><p>Laju nitrifikasi dalam budidaya sistem resirkulasi air tertutup dengan padat penebaran ikan mas (Cyprinus carpio L.) yang berbeda telah diamati di Laboratorium Budidaya Perairan, Fakultas Perikanan dan Ilmu Kelautan Universitas Mulawarman.  Ikan dipelihara dalam tong plastik dengan empat tingkat padat penebaran, yaitu 10, 20, 30 dan 40 ekor/100 l, dan diberi makan pelet komersial tiga kali sehari dengan jumlah 5 % dari berat badan ikan per hari.  Penelitian ini dirancang secara acak lengkap dengan tiga ulangan.  Laju nitrifikasi dihitung secara stoikiometrik melalui penentuan laju oksidasi amoniak dan nitrit. Hasil penelitian menunjukkan bahwa laju oksidasi amoniak dan nitrit serta laju nitrifikasi dalam sistem resirkulasi air tertutup meningkat dengan meningkatnya padat penebaran.  Sebaliknya pertumbuhan ikan menurun dengan meningkatnya padat penebaran.</p><p>Kata kunci :  Laju nitrifikasi, padat penebaran, sistem resirkulasi, ikan mas (Cyprinus carpio L.).</p>

THE BIOCHEMISTRY OF THE NITRIFYING ORGANISMS: PART 8. THE EFFECTS OF OXYGEN TENSION, NITRITE CONCENTRATION, AND CYANATE CONCENTRATION ON NITRITE OXIDATION BY NITROBACTER

1964 ◽  
Vol 42 (8) ◽  
pp. 1217-1224 ◽  
Author(s):  
W. D. Butt ◽  
H. Lees
Keyword(s):  
Oxygen Tension ◽  
Nitrite Oxidation ◽  
Nitrite Concentration ◽  
Whole Cells ◽  
Oxygen Tensions

The effects of various nitrite concentrations and oxygen tensions on nitrite oxidation by whole cells of Nitrobacter and by cell-free extracts have been investigated. The results, taken together with the effect of cyanate on the oxidation, suggest that cyanate inhibits nitrite oxidation in whole cells by impeding transfer of nitrite from the medium to the site of nitrite oxidation.

Single-disc investigations on nitrogen removal of higher loads in sequencing batch and continuously operated RDR systems

2000 ◽  
Vol 41 (4-5) ◽  
pp. 77-84 ◽  
Author(s):  
J. Lindemann ◽  
U. Wiesmann
Keyword(s):  
Nitrogen Removal ◽  
Oxidation Rate ◽  
C:N Ratio ◽  
Treatment Phase ◽  
Synthetic Wastewater ◽  
Ammonium Oxidation ◽  
Nitrite Oxidation ◽  
Rotating Disc ◽  
Hydraulic Residence Time ◽  
First Results

Nitrification of ammonium-rich synthetic wastewater was studied in a continuously operated rotating disc reactor (RDR) with additional aeration. For a wastewater with 500 mg L−1 NH4−N a nearly complete oxidation to nitrate could be demonstrated for a hydraulic residence time of 27 h (HRT). The reactor was nearly completely mixed. Nevertheless, the biofilm covering the first discs was remarkably thicker than that of the last discs. In order to study the bioactivity of selected discs, single-disc reactors were used. The determined ammonium oxidation rate was nearly independent of the thickness and location of the disc. In contrast, the nitrite oxidation rate increased from the first to the last discs. Some results from experiments on nitrogen removal in sequencing batch single-disc reactors (SBSDR) are discussed. The SBSDR was operated with 2 phases, a partially submerged phase for nitrification and a completely submerged anoxic phase in which acetate was added for denitrification. It was advantageous to operate without additional aeration and thus produce more nitrite and saving carbon and energy. First results of the treatment of a synthetic wastewater with a C:N ratio of 1 in a 5-phase SBBR process providing 2 nitrification, 2 anoxic and a final aerobic post-treatment phase showed average specific rates.

Application of magnetic enhanced bio-effect on nitrification: a comparative study of magnetic and non-magnetic carriers

2013 ◽  
Vol 67 (6) ◽  
pp. 1280-1287 ◽  
Author(s):  
Chuang Yao ◽  
Heng-Yi Lei ◽  
Qiang Yu ◽  
Shu-Ping Li ◽  
Hua-Liang Li ◽  
...  
Keyword(s):  
Oxidation Rate ◽  
Magnetic Carrier ◽  
Ammonium Oxidation ◽  
Nitrite Oxidation ◽  
Surface Magnetic Field ◽  
Biofilm Reactors ◽  
Rate Analysis ◽  
Magnetic Carriers ◽  
N Concentration ◽  
Time Required

A novel magnetic carrier with surface magnetic field of 4 mT was developed for studying the magnetic enhanced bio-effect on nitrification. The bio-effect on nitrificaton induced by the magnetic carrier was studied by comparing the performance of sequencing batch biofilm reactors filled with magnetic (MC) and non-magnetic (NMC) carriers. The result showed that the bioreactor with MC had better performance for nitrification than bioreactor with NMC. During the biofilm culturing period, the time required for nitrification formation in biofilm of the MC reactor was 25% less than that for the NMC reactor. The results also showed that the ammonium oxidation rate of the MC reactor was 1.6-fold faster than that in the NMC reactor at high influent NH4-N concentration, while nitrite oxidation rate was always accelerated regardless of influent NH4-N concentration. The specific oxygen uptake rate analysis revealed that ammonia and nitrite oxidation activities in biofilm of the MC reactor were 1.65 and 1.98 times greater than those of the NMC reactor, respectively.

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