標準號：ISO 9509-2006
中文標準名稱：水質.評價活性污泥中微生物硝化抑制作用的毒性試驗
英文標準名稱：Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms
標準類型：Z05;Z16
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：Z05;Z16
國際標準分類號：13.060.70
引用標準：ISO 7150-1;ISO 6777;ISO 5667-16;ISO 11733
適用范圍：This International Standard 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 (e.g. A/-allylthiourea; see Annex A). 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 (see Clause 9).The method is applicable to water-soluble, non-volatile chemicals, and to waste watersSludges from different sources respond differently to a given concentration of an inhibitor mainly due to reaction between the inhibitor and components of the sludge. This results in a partial neutralisation of the toxic effect. Also, since the test lasts only hours, any inhibitory effects may diminish or increase over a longer period, e.g. in the continuous activated sludge system (see ISO 5667-16).