Acute toxicity of a treated wastewater sample (an epselized sample) was tested by two different methods (luminescent bacteria and Daphnia Manga) and these tests displayed no sign of toxicity. When estimated by regular wastewater parameters, the sample tested is relatively clean and does not cause excessive loading. The study was conducted and reported in June 2019 by The Water Protection Association of the River Kokemäenjoki (Kokemäejoen vesistön vesiensuojeluyhdistys – KVVY) who is accredited by FINAS Finnish Accreditation Service (the national accreditation unit in Finland). EPSE delivered an epselized sample to their laboratory and did not take any part in testing process.
EPSE chemical displayed no sign of toxicity.
The tests displayed that any remaining EPSE chemical in treated water does not cause any harm for organisms in biological water treatment plants or in water course. The remaining concentration of EPSE chemical in sample delivered was 25mg/L. It is very unlikely to have such high concentration as a result of normal process conditions. The treated sample was a purposive result of excessive EPSE load in order to have referable results in high concentrations.
Photo by Jaron Nix / Unsplash