Besides conventional approaches to water and wastewater treatment, we know many of
advanced processes that are considered as more efficient ways of treatment. Amongst them
have an important role, so called, advanced oxidation processes (AOP’s) that generates highly
reactive hydroksyl radicals which degrade and remove a wide specter of biologicaly
nondegradable pollutants. While operating a source of UV radiation can be used or not. In
present study, H2O2/UV-C treatment was applied for partial or complete degredation of cationic
surfactant ET HT. Tested surfactant is displaying inhibitory effect to the microorganisms, what
indicates that compound is toxic and has to be pretreated before it can enter natural
environment. Using mathematical statistical RSM modeling, area of independed variables
(COD, ET HT and TOC concentrations) and their optimal values performing the best out puts,
was applied. After several experimental runs that were predicted by the model, corresponding
samples were obtained and were furthermore tested in bioreactor. The goal of the study was to
find out if ET HT surfactant can be pretreated to a level that doesn’t exhibits toxicity towards
microorganisms and to find out the effects of different pretreated samples to microorganisms.
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