Degradation of 17α-ethynyestradiol in water by UV/H_2O_2 technology

The 17α-ethynyestradiol (EE2) of low concentration in drinking water was removed adopting UV/H2O2 batch photo-oxidation reactor. The removal efficiencies of EE2 could be measured up to 90% under the conditions that the EE2 concentration in raw water was about 650μg/L, the UV light intensity was 154μW/cm2, the H2O2 input amount was 5mg/L, the reaction time was 30min. The photo degradation process coincided the pseudo-first order, reaction dynamic model. The photodegradation rate constant of EE2 increased with the increasing of H2O2 input amount and light intensity. Lower solution pH value of reaction liquor was helpful to EE2 photodegradation. Combined process of UV/H2O2 possessed the coordination action for removing EE2; the common anions such as HCO3-、NO3-、Cl - 、SO42 had inhibitory action on EE2 photodegradation.