AOPs degradation of mixtures of emerging organic pollutants performed in deionized-, tap-, and domestic laundry waste-water

The AOPs treatment of a laundry machine wastewater allows a 30% water re-use. Assessment of performance under the IEC60456 directive indicates that rehabilitated 2nd rinse water with UVC/H2O2-drop-wise and O3 have almost the same level of performance as tap water. Water solutions of sodium dodecylbenzenesulfonate (SDBS), C12-C14 alcohol polyethylene glycol ethers (Lorodac 7-24), hexadecyltrimethylammonium bromide (HTAB), and their mixtures have been treated with UVA and UVC in the presence of suspended TiO2 micropearls. The mineralization rate followed the order Lorodac > SDBS > HTAB. TiO2 at concentrations 0.2% appears very effective in both UV spectral regions. The degradation of a mixture of five emerging pollutants (carbamazepine (CBZ), diclofenac (DCF), benzophenone-3 (BP3), benzophenone-4 (BP4) and Triton X-100 (TRT) ) were investigated both in deionized and tap water, by direct UVC photolysis, UVC/H2O2 , and UVC/TiO2. The degradation kinetics of the single components is highly influenced by the nature of the matrix, except in the case of DCF.