nitrification Articles
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Nitrogen balance and transformation in the nitrification process of coking wastewater and the influence on nitrification kinetics
This paper describes the total nitrogen balance, and the direction and degree of nitrogen transformation during the nitrification process of coking wastewater. According to the actual nitrification process, the conventional nitrification kinetic equation was amended. After 48 h of nitrification, the total nitrogen content remained almost the same with error less than 0.6%. The total ...
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Inhibitory effect of thiourea on biological nitrification process and its eliminating method
Thiourea is a typical nitrification inhibitor that shows a strong inhibitory effect against the biological nitrification process. The 50% inhibitory concentration (IC50) of thiourea on nitrification was determined to be 0.088 mg g VSS−1, and nitrifiers recovered from the thiourea inhibition after it was completely degraded. The thiourea-degrading ability of the sludge system was improved to ...
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Application of advanced Respirometry in the Nitrification assessment for different levels of Temperature, pH and Oxygen
Abstract Environmental factors control the rate of nitrification. For a determined substrate concentration, the most significant environmental factors are temperature, pH and oxygen availability. The well known critical influence of those factors on the nitrification are here analyzed by making use of a specific software and advanced respirometry based on a dynamic LFS system, where the test ...
By SURCIS, S.L.
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The effects of salinity on coupled nitrification and aerobic denitrification in an estuarine system
Salinity has significant effects on nitrification and denitrification processes, particularly in estuarine systems. A dissolved oxygen-enriched river and its estuary in northern China were selected to investigate the impact of salinity gradients (0.6, 4, 7.6, 11.4 and 14.7‰) obtained from the mixing of river samples and estuarine samples with different proportions on coupled ...
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Soil-mixing effects on inorganic nitrogen production and consumption in forest and shrubland soils
Abstract Soils that are physically disturbed are often reported to show net nitrification and NO3 – loss. To investigate the response of soil N cycling rates to soil mixing, we assayed gross rates of mineralization, nitrification, NH4+ consumption, and NO3 – consumption in a suite of soils from eleven woody plant communities in Oregon, New Mexico, and Utah. Results suggest that the common ...
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Application of advanced Respirometry in the Nitrification assessment for different levels of Temperature, pH and Oxygen
For a determined substrate concentration, the most significant environmental factors are temperature, pH and oxygen availability. The well known critical influence of those factors on the nitrification are here analyzed by making use of a specific software and advanced respirometry based on a dynamic LFS system, where the test conditions can be set in the corresponding test-settings board and ...
By SURCIS, S.L.
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Study of swim–bed technology for COD removal and nitrification for latex wastewater treatment
COD removal and nitrification by swim–bed technology using a novel carrying acryl–fibre biomass carrier (biofringe) was conducted to investigate its effectiveness for latex wastewater treatment. The influent taken from a rubber factory contained 2,000 to 3,500 mg/l COD, 150 to 300 mg/l ammonia–N and 250 to 500 mg/l TKN. The quality of latex wastewater is unstable, depending on seasonal latex ...
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Influence of shear on nitrification rates in a membrane bioreactor
Grundfos BioBooster (GBB) installed and operated a membrane bioreactor (MBR) test plant in 2012. During the period it became evident that the nitrification rate was lower than expected and a study was carried out to investigate the possible reasons for the observed low-nitrification rate. Tests were conducted at a pilot plant and the effect of shear from the BioBooster membrane system and the ...
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The effect of soil properties on the toxicity of silver to the soil nitrification process
Silver (Ag) is being increasingly used in a range of consumer products, predominately as an antimicrobial agent, leading to a higher likelihood of its release into the environment. This study investigated the toxicity of Ag to the soil nitrification process in a European and Australian soils in both leached and unleached conditions. Overall, leaching of the soils was found to have a minimal ...
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Project - Carrousel St Vaast
AIRMAX 2750: extension of existing plant Process: Intermittent nitrification denitrification Gearbox with oil protection system Carrousel is a tradename of DHV ...
By KAMPS s.a.
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Characteristics of N2O production and hydroxylamine variation in short-cut nitrification SBR process
In order to study the characteristics of nitrous oxide (N2O) production and hydroxylamine (NH2OH) variation under oxic conditions, concentrations of NH2OH and N2O were simultaneously monitored in a short-cut nitrification sequencing batch reactor (SBR) operated with different influent ammonia concentrations. In the short-cut nitrification process, N2O production was increased with the ...
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Nitrification of high salinity chemical effluents
1. The problem While during the biotreatment of non inhibitory chemical effluents containing 30 to 60 g/L salt the main part of organic pollutants (TOC, COD) do become degraded, is the nitrification of the present NH4N by suspended biomass because of high osmotic pressure in the reactor not possible. 2. The solution Lab scale tests have shown, that nitrification of these high saline effluents ...
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Effects of the chemical characteristics and concentration of inorganic suspended solids on nitrification in freshwater
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 ...
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The influence of aeration rate on partial nitrification in sequencing batch reactor
Partial nitrification was investigated in Sequencing Batch Reactor (SBR) under aeration of 100, 500, 1000 and 1600 ml min−1. The biomass concentration was about 1.7 g l−1. When the ratio of alkalinity (mg l−1) to NH4+ -N (mg l−1) was 7.14 : 1, pH and DO would both increase dramatically after ammonia oxidation finished. Through monitoring and controlling the variation of pH and DO in the reactor, ...
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Simultaneous organic matter removal and nitrification of an inert self-supporting immersed media to upgrade aerated lagoons
A pilot study was performed to evaluate the potential of an inert self-supported immersed fixed film media to upgrade aerated lagoons. Simultaneous organic matter removal and nitrification was assessed under different loading rates and temperatures (near 0 °C) using 12 laboratory-scale reactors operated in parallel. Test results showed that both the temperature and the load have an influence ...
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Project - WWTP Morelia, Mexico
Plant: wwtp Morelia, Mexico Contractor: INVENT Umwelt- und Verfahrenstechnik AG Type of plant: Municipal Plant Start-up: 2006 Application: Aeration for BOD-Removal and Nitrification Scope of supply: 352 E-FLEX - Aeration Modules ...
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Application of magnetic enhanced bio-effect on nitrification: a comparative study of magnetic and non-magnetic carriers
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 ...
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Operating a pilot-scale nitrification/distillation plant for complete nutrient recovery from urine
Source-separated urine contains most of the excreted nutrients, which can be recovered by using nitrification to stabilize the urine before concentrating the nutrient solution with distillation. The aim of this study was to test this process combination at pilot scale. The nitrification process was efficient in a moving bed biofilm reactor with maximal rates of 930 mg N L−1 d−1. Rates ...
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Kinetic evaluation of nitrification performance in an immobilized cell membrane bioreactor
High rate membrane bioreactor (MBR) systems operated at extremely low sludge ages (superfast membrane bioreactors (SFMBRs)) are inefficient to achieve nitrogen removal, due to insufficient retention time for nitrifiers. Moreover, frequent chemical cleaning is required due to high biomass flux. This study aims to satisfy the nitrification in SFMBRs by using sponge as carriers, leading to the ...
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Extant Kinetics Of Mixed Wastewaters
Extant Kinetics Of Mixed Wastewaters OUR fingerprints can be used to estimate kinetic parameters for the wastewater constituents as shown in Figure A and B below. Wastewater A contained one group of readily degraded compounds and one group that was degraded at lower rates. A third region of oxygen uptake was caused by nitrification. Kinetic modeling suggested that biodegradation of each ...
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