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Nitrification Inhibition Articles & Analysis
20 articles found
Key concerns include: Nitrifying biofilm grazing Snails feed on biofilm, reducing the active nitrifying population and leading to decreased nitrification efficiency. Process equipment damage Accumulated snail shells can damage pumps, valves, and other mechanical components. ...
Lagoons are some of the oldest and simplest methods of treating wastewater. While new technologies and techniques have been developed over the years, lagoons remain prevalent in many municipalities and industries throughout the world. This may be changing with ammonia, phosphorus, and BOD regulations continuing to become stricter, lagoon technologies may be quickly becoming outdated. Ammonia ...
Nitrification inhibitor refers to a class of chemical substances that inhibit the biotransformation of ammonium nitrogen into nitrate nitrogen (NCT). ...
When applying partial nitritation (PN) to anaerobically pre-treated sewage, ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) will be exposed to dissolved sulfide and methane. Both sulfide and methane may inhibit nitrification. To gain knowledge necessary for sustaining PN under these conditions, we exposed an AOB enrichment and a mixed ...
Respirometer The respirometer utilized in this study corresponds to the BM-Advance model, with the following main features: Compact analyzer, with very low maintenance and user friendly operation Direct oxygen measurements from a maintenance-free oxygen sensor No oxygenation restriction during test performance Full control and results by means a powerful software already loaded in the PC ...
Two identical laboratory-scale AGS sequencing batch reactors (AGS-SBRs) were operated with or without nitrification (inhibition of AMOs) to assess their potential for micropollutant removal. ...
Hitherto, this functionality of bacteria has not been realized due to the initial response of the aerobic treatment stage: namely, morphology change by bacteria to filamentous forms to overcome oxygen mass transfer limitations causing bulking/foaming and nitrification inhibition. There is evidence, however, of the potential expression of Hb proteins by activated ...
The impact of the pharmaceuticals on nitrification rates, and on the abundance of ammonia‐oxidizing bacteria (AOB) and ammonia‐oxidizing archaea (AOA) was assessed. None of the pharmaceuticals at 0.1 mg/kg had any effect on nitrification. Referenced to control soil, nitrification was accelerated in soil exposed to 100 mg/kg zinc bacitracin, or ...
Study for municipal WWTP in Spain This study is ordered to SURCIS as a consequence of the low process performance, practical absence of nitrification treatment. By other side, the mixed-liquor presented some abnormal features such as weakness, dark colour and abundant white foaming. Data for study interest Aeration system: fine bubble diffusers + liquid oxygen injection Ammonium ...
Water utilities use operational strategies such as increasing pH, chlorine-ammonia ratio, and/or chloramine residual, distribution main flushing, and periodic break-point chlorination to control nitrification of chloraminated water in distribution systems. Although these methods are proven to be useful in controlling nitrification, the results are utility ...
These include the substrate (COD) and oxygen concentration, temperature, pH, and the presence of toxic or inhibiting substances; many substances can potentially inhibit the nitrification reactions and metals are particularly strong inhibitors. ...
Acute Microtox® toxicity, mainly attributed to detergents used for the tunnel wash, decreased significantly at low suspended solids concentrations after sedimentation using a flocculent. The tunnel wash water did not inhibit nitrification. The treated water should be suitable for discharge into recipient waters or a wastewater treatment plant. ...
During the startup of a full-scale anoxic/aerobic (A/O) biological treatment plant for acrylonitrile wastewater, the removal efficiencies of NH3-N and total Kjeldahl nitrogen (TKN) were 1.29 and 0.83% on day 30, respectively. The nitrification process was almost totally inhibited, which was mainly caused by the inhibitory effects of toxic compounds. To ...
These include the substrate (COD) and oxygen concentration, temperature, pH, and the presence of toxic or inhibiting substances; many substances can potentially inhibit the nitrification reactions and metals are particularly strong inhibitors. ...
Nevertheless, chlorination/dechlorination strongly affected the BOD measurement when nitrification was inhibited by changing bioactivity/biodegradation rates. ...
The effects of free ammonia (FA) or free nitrous acid (FNA) on partial nitrification (PN) has been well investigated. Nevertheless, little information was known about the combined effects of nitrogen loading rate (NLR) and substrate inhibition, as well as the impact on the community structure of nitrifiers. ...
Jeff Holmes, Process Optimisation Manager for Yorkshire Water says “The instrument will provide data on activated sludge health, oxygen uptake rates, nitrification inhibition and respiration inhibition and will more than pay for itself over the planned experimental programme. ...
The system exhibited an excellent capacity for simultaneous phenol biodegradation and biological nitrogen removal without effluent internal recirculation when the influent phenol concentration was as high as 1,000 mg/L (organic loading rate of 9.54 kg COD/(m3 d)) and the ammonia loading rates of 0.20, 0.32 and 0.40 kg NH4+-N/(m3 d) respectively). Nitrification process was ...
These effects were attributed to a delay in urea hydrolysis and inhibition of nitrification. The fraction of applied urea-N lost as N2O for broadcast, band, and nest placements applied at the recommended rate averaged 2.0, 2.7, and 5.8 g N kg–1 N, respectively. ...
In addition 1,1-dimethylhydrazine oxidizes to produce NDMA. DMA is also used for the inhibition of nitrification in soil, as a plasticizer for rubber and polymers, as a solvent in the fiber and plastics industry, an antioxidant, a softener of copolymers, and as an additive to lubricants. ...