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Showing 1 to 20 of 341 for “"nitrification"”.
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Oxygen isotope systematics of nitrification
During nitrification there is an exchange of oxygen atoms between water and nitrite, causing the [delta]¹⁸O of nitrate produced by nitrification to be closer to the [delta]¹⁸O of water than expected. A series of lab and field experiments were set up in order to quantify the exchange, and then …
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A study of nitrification kinetics
… the effects of heterotrophic activity on the nitrification process. The parameters monitored included mixed liquor suspended solids, suspended solids concentration in the effluent and influent; effluent ammonia and nitrate nitrogen concentration. The culture from the autotrophic unit was used …
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Nitrification in a pine bark medium
The influence of nitrification on the “soil” solution of container media has not been documented. The investigation of this influence is justified since the ionic form of N in a soil solution has a significant influence on plant tissue nutrient content and growth. Three genera of woody plants were …
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Nitrogen deposition and nitrification in coniferous forests’
… and is closely related to the controls of nitrification. Although this process has been intensely studied in pure cultures for some nitrifying bacteria, the organisms responsible and controlling factors in acid forest soils are still poorly understood. A better comprehension of the fate of …
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Nitrification of Landfill Leachate by Biofilm Columns
… most cases the COD and BOD are treated, and then nitrification is performed in a separate sophisticated ex situ system. The additional costs of these systems can be very high. The use of a readily available media for in situ nitrification should be considered a prime objective to avoid extra …
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Nitrification and denitrification in the activated sludge process
The characteristics of the single-sludge nitrification-denitrification process were investigated using influent organics as the carbon source and nitrate as an electron acceptor to see if any oxygen savings could be obtained. The key research tools used were mathematical modeling, computer …
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Nitrification and denitrification kinetics in the activated sludge process
… a reliable description of the behaviour of the nitrification-denitrification single sludge activated sludge process under constant, cyclic or unsteady conditions of flow and load. The extended model applies to series reactor systems containing aerated and non-aerated reactors and to single …
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External nitrification in biological nutrient removal activated sludge systems
… large biological reactor volumes required for nitrification, (ii) filamentous organism bulking of the sludge that develops in the system, (iii) treatment of the P rich waste sludge from the system and (iv) containment of the large mass of P in the sludge during a failure of the aeration in the …
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External nitrification in biological nutrient removal activated sludge systems
In conventional nitrification-denitrification biological excess phosphorous removal (NDBEPR) activated sludge systems, such as the UCT system for example, both nitrification and phosphorous uptake (P uptake) occur simultaneously in the, usually large, aerobic reactor. In the UCT system the nitrate …
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Biological treatment schemes for preventing oxime inhibition of nitrification
… scheme that could achieve oxime degradation and nitrification in the same treatment process. Aerobic and anoxic batch experiments were initially performed to determine degrees of nitrification inhibition caused by three oximes, acetaldehyde oxime (AAO), aldicarb oxime (ADO), and methyl ethyl …
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Experimental testing and modeling of partial nitrification at different temperatures
… removal (BNR) processes consume high energy for nitrification and require external carbon for denitrification. Alternatively, partial nitrification is of interest as an emerging technology for its lower need of organic carbon addition and cost savings in aeration. In this study, the main …
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Nitrification process in integrated fixed-film activated sludge (IFFAS) system
… bacteria (DEN). This study looked at alternative nitrification processes, including anaerobic ammonia oxidiation (anammox) reactions that may be innately present in an integrated fixed-film activated sludge (IFFAS). Due to the unique characteristics of IFFAS configuration, the biofilm component …
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Water Quality Variations During Nitrification In Drinking Water Distribution Systems
… the major water quality parameters during a nitrification episode. Nitrification unexpectedly occurred in a chloraminated pilot drinking water distribution system practicing with a 4.0 mg/L as Cl2 residual dosed at 4.5:1 Cl2:NH3-N. Surface, ground and sea water were treated and disinfected …
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Nitrification Inhibitors, Leaching, and Time of Nitrogen Application for Corn
Made available in DSpace on 2014-12-10T17:12:47Z (GMT). No. of bitstreams: 1 7013358.pdf: 202129 bytes, checksum: b0638239aaa8e73ed1b1d50f08e3287d (MD5) Previous issue date: 1969
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Nitrification Investigation And Modeling In The Chloraminated Drinking Water Distribution System
… dissertation consists of five papers concerning nitrification in chloraminated drinking water distribution systems in a one and a half year field study. Seven finished waters were produced from different treatment processes and distributed to eighteen pilot distribution systems (PDSs) that were …
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Partial nitrification and oxygen transfer analysis utilizing hollow fiber membrane aeration
… : NO<sub>2</sub><sup>–</sup> ratio, a partial nitrification system is coupled with the ANAMMOX system to provide the necessary substrates.y A hollow fiber membrane reactor was employed to create this partial nitrification system.y Gas mass transfer was first evaluated to determine the …
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A study of nitrification in lakes of the English Lake District
Nitrification became the dominant nitrogen transformation in a number of lakes which accumulated ammonium, in hypolimnetic water, under aerobic conditions. The timing and duration of this activity varied between lakes but was characterized by decreasing ammonium, and increasing nitrate, …
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