Zahn Wellens / EMPA Readily biodegradable assessment

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Aqua Enviro utilise three main techniques for assessing feedstocks for aerobic treatment. With these being carbonaceous and nitrification inhibition testing, Zahn Wellens / EMPA RBCOD assessment and laboratory trials using sequence batch reactors.

The Zahn Wellens test is usually the 2nd stage of assessment, comprising of a batch test whereby a known quantity of test material is added to a continually mixed and aerated vessel, containing seed sludge from a suitable activated sludge process. COD degradation is recorded over the 28 day test period.

A report of results will be produced which will show:-

% of biodegradable COD
COD degradation curve over the test period
Amenability of the feedstock for Aerobic treatment
Indicate whether the feedstock possesses any inhibitory properties towards carbonaceous bacterial populations

1kg or 1L of test material is required for the testing, for a quotation or general query please contact our Laboratory Manager Andy burgess by tel 01924 242 255 or email andyburgess@aquaenviro.co.uk

1kg or 1L of test material is required for the testing, for a quotation or general query please contact our Laboratory Manager Andy Burgess by tel 01924 242 255 or email andyburgess@aquaenviro.co.uk

Synonyms / keywords: OECD 302B, EMPA, Zahn Wellens, BCOD, biodegradable chemical oxygen demand, Aerobic biodegradability, aerobic biomass treatability, activated sludge, % COD degradation

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