Removal of chelating agents from waste water
Problem: EDTA and similiar chelating agents are commonly used chemicals capable of chelating metals. They can increase bioavailability of heavy and radioactive metals in the environment, restrict the availability of essential metals or contribute to eutrophication. EDTA concentrations around 200 μg/l in Labe (Ústí nad Labem), in Bílina cca 60 μg/l have been observed.
Solution:In the first step we developed the methods for determination of chelating agents by GC-MS and HPLC-DAD. Subsequently, degradation of EDTA on columns with biofilm under various conditions have been tested. Degradation efficiency was around 50 %. This solution can help to reduce emissions of EDTA and similiar chelating agents into the environment. Currently we are developing magnetic sorbent modified by EDTA which can be used for removal of heavy metals with subsequent separation of sorbent by magnetic field and regeneration.