Application of zahn-wellens method to determine biodegradability of an anti– spill product
Keywords:biodegradation kinetic; chemical oxygen demand; spills; removal.
The aim of this study was to determine the biodegradability of a product to control oil spill. It was evaluated the primary and final biodegradability of an anti-spill product in aqueous medium, also the total elimination by aerobic microorganisms. The kinetic of biodegradation followed by ISO standard method of dichromate to Chemical Oxygen Demand (COD), in an aqueous static system containing a selected quantity of the compound. It was prepared a biodegradable reference compound solution and a blank with test medium and inoculum. The removal increased until 14 days, same to the reference compound. The evaluated product can be consider biodegradable, according to the COD removal at the time. The kinetic of biodegradation followed a polynomial equation of second order, and reached a 94.5% COD removal.
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