The energy requirements of ozonation, O3/H2O2, UV, UV/H2O2 (KrCl excilamp, 222 nm) and electrolysis with boron-doped diamond (BDD) electrodes for 90% removal of organic micropollutants, namely, Bisphenol A (BPA), p-chlorobenzoic acid (pCBA), Carbamazepine (CBZ), Atrazine (ATR), Bezafibrate (BZ) and Iohexol were compared. Synthetic water (SW), lake water (LW) and a wastewater (WW) were assessed. The degradation of micropollutants by BDD had by far the highest energy demand. However, in this case a full mineralization of the target compounds and the organic matrix can be assumed. Direct UV irradiation of SW at 222 nm is more energy intensive than ozonation of SW spiked with pCBA, Iohexol or BZ. Application of O3/H2O2 requires less energy than UV/H2O2 for the degradation of pCBA, BZ, BPA or CBZ in SW and LW. Considering WW, direct UV requires the lowest energy for a 90% degradation of the selected micropollutants, suggesting an important role of photosensitization.

Comparison of energy requirements for removal of organic micropollutants by ozone, O3/H2O2, UV, UV/H2O2 and boron-doped diamond (BDD) electrodes

245th National Meeting (2013)

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