Test No. 244: Protozoan Activated Sludge Inhibition Test
This Test Guideline describes a method to assess effects of a test chemical on the
phagocytotic activity of activated sludge containing protozoan organisms under defined
conditions in the presence of different concentrations of the test chemical. The principle
of biological sewage-treatment plants (STP) is to transform the organic matter of
incoming waste-water in microbial biomass, which in turn is separated from the liquid
yielding a purified effluent. The purpose of the test is to provide a means to record
effects of test chemicals on ciliated protozoa in sewage treatment plants, which due
to their grazing on bacteria considerably contribute to the functioning of STPs.
Published on October 09, 2017Also available in: French
In series:OECD Guidelines for the Testing of Chemicals, Section 2: Effects on Biotic Systemsview more titles