OECD303 (A) & OECD303 (B)

Simulation Test: Aerobic Sewage Treatment

Study description if available:

This Test Guideline describes two simulations tests used in the aerobic sewage treatment.Activated Sludge Units are designed to determine the elimination and the primary and/or ultimate biodegradation of water-soluble organic compounds by aerobic micro-organisms in a continuously operated test system simulating the activated sludge process. Two continuously operated test units are run in parallel under identical conditions. Normally the mean hydraulic retention time is 6 h and the mean sludge age is 6 to 10 days. Sludge is wasted by one of two methods, the test substance is normally added at a concentration of between 10 mg/l dissolved organic carbon (DOC) and 20 mg/l DOC, to the influent of only one of the units. The second unit is used as a control. The DOC, preferably, or chemical oxygen demand (COD) is determined, together with the concentration of the test substance by specific analysis, in the effluent from the unit receiving the test substance.In Biofilms, synthetic or domestic sewage, and the test substance, in admixture or alone, are applied to the internal surface of a slowly rotating inclined tube. A layer of microorganisms is built up on the internal surface. Effluent from the tube is collected and either settled and/or filtered before analysis for DOC and/or the test substance by a specific method. Control units are operated in parallel under the same conditions.The difference between the concentrations of DOC/COD in the effluent from the test and control units is assumed to be due to the test substance. This difference is compared with the concentration of the added test substance to calculate the elimination of the test substance. Biodegradation may normally be distinguished from bio-adsorption by careful examination of the elimination-time curve.

Tips: search our services here by using keywords, species, guideline number or endpoint.
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
You can also filter by sector using the buttons below.
SANTE 2020/12830 Rev.1.
Read more & request a quote
ISO14669
Crustacean Acute: Toxicity Study - Acartia Tonsa or Tisbe battaglia. Determination of acute lethal toxicity to marine copepods.
Read more & request a quote
Arenicola marina sediment study
Read more & request a quote
Corophium volutator acute toxicity
Read more & request a quote
Corophium volutator chronic study
Read more & request a quote
OPPTS/OCSPP850.1035
Mysid Acute (Static and Flow Through)
Read more & request a quote
OPPTS/OCSPP850.1055
ISO17244
Oyster Embryo Larval Development Test
Read more & request a quote
OPPTS/OCSPP850.135
Mysid Chronic Toxicity Test
Read more & request a quote
OPPTS/OCSPP850.14
Fish Chronic: Saltwater - Toxicity Study
Read more & request a quote
OPPTS/OCSPP850.45
ISO10253
Algal Acute Marine - Analytical Chemistry
Read more & request a quote
OPPTS/OCSPP850.45
ISO10253
Algal Acute Marine - Growth Inhibition Study
Read more & request a quote
OECD Draft
Soil Photolysis
Read more & request a quote
OECD102
Melting Point/Melting Range
Read more & request a quote
OECD103
Boiling Point
Read more & request a quote
OECD104
Vapour/Pressure (isoteniscope)
Read more & request a quote
OECD105
EC A.6
Water Solubility
Read more & request a quote
OECD106
Adsorption/Desorption
Read more & request a quote
OECD107
OPPTS/OCSPP830.755
EC A.8
Partition Coefficient
Read more & request a quote
OECD109
EC A.3
Relative Density
Read more & request a quote