Results 21 to 30 of about 1,971,943 (294)

Nitrogen phytoremediation by water hyacinth (Eichhornia crassipes (Mart.) Solms) [PDF]

open access: yes, 2008
The phytoremediation potential of water hyacinth, Eichhornia crassipes (Mart.) Solms, was examined in two independent studies under nitrogen (N) rates of 0, 40, 80, 100, 150, 200, and 300 ppm.
Rule, J.H.   +3 more
core   +1 more source

Nitrate removal in a restored riparian groundwater system : functioning and importance of individual riparian zones [PDF]

open access: yes, 2012
For the design and the assessment of river restoration projects, it is important to know to what extent the elimination of reactive nitrogen (N) can be improved in the riparian groundwater.
Tockner, Klement   +26 more
core   +2 more sources

Low threshold for nitrogen concentration saturation in headwaters increases regional and coastal delivery

open access: yesEnvironmental Research Letters, 2020
River corridors store, convey, and process nutrients from terrestrial and upstream sources, regulating delivery from headwaters to estuaries. A consequence of chronic excess nitrogen loading, as supported by theory and field studies in specific ...
Noah M Schmadel   +7 more
doaj   +1 more source

Design methodologies to determine optimal staging of membrane-aerated biofilm reactors for mainstream treatment with anammox

open access: yesWater Science and Technology, 2022
Partial nitritation anammox (PNA) membrane-aerated biofilm reactors (MABRs) can be used in mainstream nitrogen removal to help facilities reduce their energy consumption.
Brett M. Wagner   +2 more
doaj   +1 more source

Organic and nutrient removal during start-up period for domestic sewage treatment by an A/O mixed carrier system [PDF]

open access: yesE3S Web of Conferences, 2020
This study combined biofilm method and A/O process reasonably to form the biological treatment system. This experiment focused on the performance of the system for domestic sewage according to the determination of CODCr, ammonia nitrogen, total nitrogen,
Liao Wei, Li Hui-qiang, Yang Ping
doaj   +1 more source

Nitrogen Removal by HN-AD Bacteria Immobilized on Modified Absorbent Stone [PDF]

open access: yesChemical and Biochemical Engineering Quarterly, 2020
How to simplify the nitrogen removal process, reduce the cost and improve the efficiency has become an urgent problem to be solved. In this research, the isolated HNAD (heterotrophic nitrification and aerobic denitrification) bacteria were used to remove
W. Zhang, Z. Zhang, S. Wang
doaj   +1 more source

Nitrogen removal in marine environments: recent findings and future research challenges [PDF]

open access: yes, 2005
Respiratory reduction of nitrate (denitrification) is recognized as the most important process converting biologically available (fixed) nitrogen to N2. In current N cycle models, a major proportion of global marine denitrification (50–70%) is assumed to
Bo Thamdrup   +25 more
core   +1 more source

Ammonia removal in anaerobic digestion by biogas stripping: an evaluation of process alternatives using a first order rate model based on experimental findings [PDF]

open access: yes, 2011
The feasibility of biogas stripping to remove ammonia in the anaerobic digestion of source segregated food waste was investigated. It was found in batch experiments that ammonia could be removed from digestate and that the removal followed 1st order ...
Walker, Mark   +11 more
core   +1 more source

Interconversion and Removal of Inorganic Nitrogen Compounds via UV Irradiation

open access: yesChemEngineering, 2023
Dissolved inorganic nitrogen (DIN) species are key components of the nitrogen cycle and are the main nitrogen pollutants in groundwater. This study investigated the interconversion and removal of the principal DIN compounds (NO3−, NO2− and NH4+) via UV ...
Alejandro M. Senn, Natalia Quici
doaj   +1 more source

Quantification of nitrate removal by a flooded alluvial zone in the Ill floodplain (Eastern France) [PDF]

open access: yes, 1999
The nitrate reducing capacity of a flooded system in the Ill floodplain (Eastern France) was investigated for a period of 2 years. The methodology used consisted of a spatio-temporal monitoring of stream flow and nitrate concentrations in the groundwater
Trémolières, Michèle   +5 more
core   +1 more source

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