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- Ammoniacal nitrogen (NH3-N) is a measure for the amount of ammonia, a toxic pollutant often found in landfill leachate and in waste products, such as sewage, liquid manure and other liquid organic waste products. It can also be used as a measure of the health of water in natural bodies such as rivers or lakes, or in man made water reservoirs. The term is used widely in waste treatment and water purification systems. Ammonia can directly poison humans and upset the equilibrium of water systems. The values of ammoniacal nitrogen in water or waste liquids are measured in milligram per liter and are used for specifying water treatment systems and facilities. The typical output of liquid manure from a dairy farm, after separation from the solids is 1600 mg NH3-N /L. Sewage treatment plants, receiving lower values, typically remove 80% and more of input ammonia and reach NH3-N values of 250 mg/L or less. The ammonium nitrogen value is also used in the context of properly designed landfill systems, where the leachate is being pumped to the surface and treated before it enters the ground water, testing the quality of the water exiting the treatment system. The term NH3-N removal is also commonly used in scientific publications as a short way to depict Ammonia in water, and not the measure of its quantity. (en)
- Als Ammoniumstickstoff wird der in Form von Ammonium (NH4+) vorhandene Stickstoffanteil bezeichnet. Bei Stickstoffdüngern in der Landwirtschaft und in der Abwasserreinigung wird der Anteil Ammoniumstickstoff angegeben. In der Landwirtschaft werden stickstoffhaltige Dünger, auch in Form von Gülle (allg. Wirtschaftsdünger) eingesetzt. Diese Wirtschaftsdünger enthalten Stickstoff zum Teil als Ammoniumverbindungen (Ammoniumnitrat, Ammoniumphosphat) und zum Teil als Nitrat (Calciumnitrat in Blaukorn), oft aber auch in Form von organischen Stickstoffverbindungen (Proteine, Amine, Harnstoff). Durch Nitrifikation entsteht im Boden unter Mitwirkung von Bakterien aus Ammoniumionen (NH4+) über die Zwischenstufe Nitrit (NO2−) das Nitrat (NO3−), das von den Pflanzen aufgenommen werden kann. Der organisch gebundene Stickstoff kann im Boden mineralisiert werden [Freisetzung von Ammoniumstickstoff (Ammoniumverbindungen) und letztlich auch Nitrat] oder in den Bodenhumusvorrat eingehen, aus dem er erst allmählich wieder mineralisiert wird (in der Regel 1 % bis 3 % -Doppelung pro Jahr). (de)
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- Als Ammoniumstickstoff wird der in Form von Ammonium (NH4+) vorhandene Stickstoffanteil bezeichnet. Bei Stickstoffdüngern in der Landwirtschaft und in der Abwasserreinigung wird der Anteil Ammoniumstickstoff angegeben. (de)
- Ammoniacal nitrogen (NH3-N) is a measure for the amount of ammonia, a toxic pollutant often found in landfill leachate and in waste products, such as sewage, liquid manure and other liquid organic waste products. It can also be used as a measure of the health of water in natural bodies such as rivers or lakes, or in man made water reservoirs. The term is used widely in waste treatment and water purification systems. Ammonia can directly poison humans and upset the equilibrium of water systems. (en)
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- Ammoniumstickstoff (de)
- Ammoniacal nitrogen (en)
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