ISO-9509 › Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms
The following bibliographic material is provided to assist you with your purchasing decision:
ISO 9509:2006 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 3 h or up to 24 h with weakly nitrifying sludge.
The method is applicable to 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. If the nitrification rate is within a suitable range for the test, i.e. 2 mg of nitrogen per gram of suspended solid and hour to 6,5 mg of nitrogen per gram of suspended solids and hour, the sludge may be used directly. If not, adjustments are necessary.
The method is applicable to water-soluble, non-volatile chemicals, and to waste waters
To find similar documents by classification:
13.060.70 (Examination of biological properties of water Microbiology of water, see 07.100.20)
This document comes with our free Notification Service, good for the life of the document.
This document is available in either Paper or PDF format.
Document Number
ISO 9509:2006
Revision Level
2ND EDITION
Status
Current
Publication Date
July 1, 2006
Committee Number
ISO/TC 147/SC 5