NDLI: Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation)

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Test No. 218: Sediment-Water Chironomid Toxicity Using Spiked Sediment

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Test No. 220: Enchytraeid Reproduction Test

Test No. 222: Earthworm Reproduction Test (Eisenia fetida/Eisenia andrei)

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Test No. 205: Avian Dietary Toxicity Test

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Test No. 207: Earthworm, Acute Toxicity Tests

Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation)

Content Provider	OECD iLibrary
Organization	OECD
Abstract	This Test Guideline is designed to assess the effects of a substance on micro-organisms from activated sludge of waste-water treatment plants by measuring their respiration rate (carbon and/or ammonium oxidation) as oxygen consumption. The test results may also serve as an indicator of suitable non-inhibitory concentrations of test substances to be used in biodegradability tests. The test allows the determination of ECx and/or NOEC values of the test substance. The inhibition of three different oxygen uptakes may be determined, i.e. total, heterotrophic only, and that due to nitrification in the absence and presence of N-allylthiourea, a specific nitrification inhibitor. For obtaining both NOEC and ECx, six controls and five treatment concentrations in a geometric series with five replicates are recommended. In each test vessel, test mixtures containing water, synthetic sewage feed and the test substance are incubated at the pH of 7.5 ±0.5 and the temperature within 20±2°C under forced aeration to keep the dissolved oxygen concentration above 60-70% saturation. The oxygen consumption is measured after 3 hours of exposure and additional measurements at 30 minutes of exposure can be performed in the case that the test substance is rapidly degraded.
Page Count	18
ISSN	20745761
e-ISBN	9789264070080
Language	English
Publisher	OECD Publishing
Publisher Date	2010-07-23
Access Restriction	Open
Subject Keyword	Environment
Content Type	Text
Resource Type	Book

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Test No. 209: Activated Sludge, Respiration Inhibition Test (Carbon and Ammonium Oxidation)

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