This International Standard specifies a method for the evaluation in aqueous medium of the ultimate<\/p>\n
biodegradability and, as additional information, the primary biodegradability and the total elimination from water, of<\/p>\n
organic compounds at a given concentration by aerobic microorganisms.<\/p>\n
The conditions described in this International Standard normally correspond to optimal conditions for allowing the<\/p>\n
maximum value of biodegradation to occur with the chosen inoculum in the test time. These conditions may even be<\/p>\n
more favourable than in full-scale wastewater treatment plants, especially if their hydraulic retention time, sludge<\/p>\n
age or the adaptation of the activated sludge is not optimal.<\/p>\n
The method applies to organic compounds which are<\/p>\n
a) water-soluble at the concentration used under the test conditions and not expected to be transformed to<\/p>\n
insoluble metabolites if biodegradation and not elimination only shall be determined;<\/p>\n
b) nonvolatile, or which have a negligible vapour pressure under the test conditions;<\/p>\n
c) not lost by foaming from the test solution;<\/p>\n
d) not inhibitory to the test microorganisms at the concentration chosen for the test. Inhibitory effects can be<\/p>\n
determined using a suitable test method (e.g. see ISO 8192). If the test compound is toxic, the test<\/p>\n
concentration must be lowered, or a pre-exposed inoculum can be used.<\/p>\n
This International Standard is also applicable to the measurement of biodegradation and elimination of dissolved<\/p>\n
organic compounds in wastewater (also called "test compound" in the method).<\/p>\n
NOTE If more information is required to predict the behaviour of test compounds or wastewater in a treatment plant, a<\/p>\n
simulation test (e.g. the activated sludge simulation test ISO 11733) should be performed. For appropriate use of this method<\/p>\n
and for alternative biodegradation methods, see ISO 15462.<\/p>\n","protected":false},"excerpt":{"rendered":"
Water quality \u2014 Evaluation of ultimate aerobic biodegradability of organic compounds in aqueous medium \u2014 Static test (Zahn-Wellens method)<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ISO<\/b><\/a><\/td>\n 1999-06<\/td>\n 16<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":630917,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[218,2634],"product_tag":[],"class_list":{"0":"post-630907","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-13-060-70","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/630907","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/630917"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=630907"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=630907"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=630907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}