DIN EN ISO 9509:2006-10
Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms (ISO 9509:2006); German version EN ISO 9509:2006
| Fecha edición: |
2006-10-01
En Vigor
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| Idiomas disponibles: | Inglés, Alemán |
| Resumen: | This document specifies a method for assessing the short-term inhibitory effect of waters, waste waters or test substances on nitrifying bacteria in activated sludge. The inhibitory effect is estimated over an exposure period of usually 4 h or up to 24 h with weakly nitrifying sludge. The method is applicable with nitrifying activated sludge derived from domestic and synthetic sewage and also to sludges from industrial and mixed domestic and industrial waste waters. The nitrifying activity of the sludge is verified by testing in the presence and absence of a specific inhibitor (e. g. N-allylthiourea). If the nitrification rate is within a suitable range for the test the sludge may be used directly; if adjustments are not necessary. |
| Keywords: | Activated sludges|Chemicals|Definitions|Determination|Determination of content|Escapement mechanisms|Examination of sludge|Inhibition|Microbiological analysis|Microorganisms|Nitrification|Nitrifying bacteria|Quality|Sewage|Sludge|Substances|Testing|Toxic|Water|Water analysis|Water practice|Water quality|Water testing |
| ICS: | 13.060.50 - Determinación de sustancias químicas en el agua |
| CTN: | |
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Equivalencia Internacional |
Idéntica EN ISO 9509:2006 Idéntica ISO 9509:2006 |
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Reemplazo Normas |
Reemplaza a DIN EN ISO 9509:1995-04 Reemplaza a DIN EN ISO 9509:2005-08 |
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