denitrification Articles
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Nitrate removal from groundwater by hydrogen-fed autotrophic denitrification in a bio-ceramsite reactor
In this work, the denitrification performance of a bio-ceramsite reactor based on autohydrogenotrophic denitrification was investigated. The effects of various experimental parameters such as nitrate loading, carbon to nitrogen ratio (C/N), water temperature and pH were evaluated during the operation. The unique aspect of this research is that the bio-reactor uses ceramsite as a carrier, which ...
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The heterotrophic-combined-with-autotrophic denitrification process: performance and interaction mechanisms
In this work, the interaction mechanisms between an autotrophic denitrification (AD) and heterotrophic denitrification (HD) process in a heterotrophic-autotrophic denitrification (HAD) system were investigated, and the performance of the HAD system under different S/Ac− molar ratios was also evaluated. The results demonstrated that the heterotrophic-combined-with-autotrophic ...
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Influence of denitrification reactor retention time distribution (RTD) on dissolved oxygen control and nitrogen removal efficiency
Low concentrations of dissolved oxygen (DO) are usually found in biological anoxic pre-denitrification reactors, causing a reduction in nitrogen removal efficiency. Therefore, the reduction of DO in such reactors is fundamental for achieving good nutrient removal. The article shows the results of an experimental study carried out to evaluate the effect of the anoxic reactor hydrodynamic model ...
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Characterization and kinetics of sulfide-oxidizing autotrophic denitrification in batch reactors containing suspended and immobilized cells
Sulfide-oxidizing autotrophic denitrification is an advantageous alternative over heterotrophic denitrification, and may have potential for nitrogen removal of low-strength wastewaters, such as anaerobically pre-treated domestic sewage. This study evaluated the fundamentals and kinetics of this process in batch reactors containing suspended and immobilized cells. Batch tests were performed for ...
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Enhancement of denitrification in a down-flow hanging sponge reactor by effluent recirculation
A down-flow hanging sponge reactor, constructed by connecting three identical units in series, was applied to the treatment of artificial wastewater containing phenol and ammonia under high salinity conditions (10.9 g-Cl−/L). The theoretical hydraulic retention time (HRT) of each unit was 4 h (total HRT = 12 h). To enhance denitrification by effluent recirculation, the effluent ...
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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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Denitrification and Floating Sludge
What is Denitrification? Denitrification is the conversion of soluble nitrate to nitrogen gas in the nitrogen cycle. For denitrification to occur, three factors are needed: Presence of Nitrate Anoxic conditions (no free dissolved oxygen) A carbon source (soluble BOD) Floating Sludge Denitrification is useful and desired in certain anoxic zones designed to remove nitrogen. However, the ...
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Project - WWTP Berlin Schönerlinde, Germany
Plant: wwtp Berlin Schönerlinde, Germany Contractor: INVENT Umwelt- & Verfahrenstechnik AG Type of plant: Municipal Plant Start-up: 1999/2002 Application: Suspension & Homogenization for Bio-P and Denitrification Scope of supply: 96 HYPERCLASSIC- Mixers 96 HYPERBRIDGES ...
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Simultaneous autotrophic denitrification and nitrification in a low-oxygen reaction environment
The occurrence of autotrophic denitrification and nitrification activities by ammonia-oxidising bacteria and nitrite-oxidising bacteria is studied in a bioreactor system operable at low-dissolved oxygen (DO) and at variable oxygen influx rates. At a loading of 3.6 mg NH4+–N/h into the bioreactor, simultaneous autotrophic denitrification and nitrification contributed to ...
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Hydrogenotrophic denitrification in an attached growth reactor under various operating conditions
To study the performance of an attached growth reactor on nitrate-nitrogen (NO3-N) removal by a hydrogenotrophic denitrification process, the reactor was operated under various H2 flow rates (30, 50 and 70 mL/min), hydraulic retention times (HRTs) (2.6, 3.1, 4.7 and 6.7 h) and inorganic carbon (IC) concentrations (excess and no IC addition). Synthetic NO3-N water was prepared in accordance with ...
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Nitrogen removal from reject water with primary sludge as denitrification carbon source
A novel system was used for nitrogen removal from reject water. This system includes one anoxic/oxic reactor for nitrification and a special reactor for denitrification in which primary sludge was added intermittently as electron donor. In denitrification reactor, sludge fermentation and denitrification reaction took place simultaneously and promoted each other. It was found that effluent recycle ...
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Denitrification of drinking water using
Saccharum spontaneum L. as a natural organic solid substrateThere is a global concern regarding the increasing pollution of natural water bodies by nitrate as a result of anthropogenic activities. To address this situation, natural organic solid substrates (NOSS) have been investigated as carbon sources in denitrification. Despite advances in this field, a lack of knowledge about the kinetics involved in the denitrification processes using NOSS still ...
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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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Project - WWTP Vienna, Austria
Plant: wwtp Vienna Simmering, Austria Contractor: Integral Montage Anlagen- und Rohrtechnik GmbH Type of plant: Municipal Plant Start-up: 2005 Application: Suspension & Homogenization for Bio-P and Denitrification Scope of supply: 30 HYPERCLASSIC - Mixers 30 HYPERPITCH ...
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Comparison of particulate pyrite autotrophic denitrification (PPAD) and sulfur oxidizing denitrification (SOD) for treatment of nitrified wastewater
The use of reduced sulfur compounds as electron donors for biological denitrification has the potential to reduce chemical and sludge disposal costs as well as carry-over of organic carbon to the effluent that often occurs with heterotrophic denitrification. Although a number of prior studies have evaluated sulfur oxidizing denitrification (SOD), no prior studies have evaluated particulate ...
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Influence of plant communities on denitrification in a tidal freshwater marsh of the potomac river, United States
Received for publication May 9, 2008. We investigated whether marsh surface elevation, plant community composition (annuals vs. perennials), and organic matter quantity/quality were associated with differences in denitrification rates in an urban tidal freshwater marsh of the Potomac River, United States. We measured denitrification rates using both denitrification enzyme activity (DEA) with ...
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Project - WWTP Neufinsing, Germany
Plant: WWTP Neufinsing, Germany Contractor: Hydrobau Riesa Wassertechnik GmbH, Germany Type pf plant: Municipal Treatment Plant Start-up: 2017 Application: Suspension & Homogenization for Denitrification in anoxic Basins Scope of supply: 6 HYPERDIVE - Mixer Evolution7 ...
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Effect of passivated iron powder on final-product distribution in Fe-supported denitrification
An integrated nitrate treatment using passivated iron powder (PIP) and Alcaligenes eutrophus, which is a kind of hydrogenotrophic denitrifying bacteria, was conducted to investigate the effect of iron oxide coating on final-product distribution in hydrogenotrophic denitrification. Based on the results, the autotrophic denitrification supported by PIP could completely remove about 50 ...
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Project - Carrousel Nevele
AIRMAX 2000 : Replacement of old surface aerators Process : Intermittent nitrification/denitrification Gearbox with oil protection system Carrousel is a trade name of DHV ...
By KAMPS s.a.
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Evaluation of intermittent air sparging in an anoxic denitrification membrane bioreactor
The impact of intermittent air sparging on the operation of an anoxic (dissolved oxygen 0.39 m3 m−2 h−1 with sparge lengths of 10 to 60 seconds, a low dissolved oxygen residual of 0.05 to 0.90 mg O2 l−1 was formed which typically inhibited denitrification; oxygen transfer efficiency increased with increasing sparge time. Residual oxygen was rapidly consumed at a rate, rO2, of ...
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