Ozone membrane contactor to intensify gas/liquid mass transfer and contaminants of emerging concern oxidation

A tubular porous borosilicate membrane contactor was investigated for ozone gas/water mass transfer and the removal of contaminants emerging concern (CECs) in water. Ozone contact occurs on shell-side, which is coated with a photocatalyst (TiO2-P25), as gas stream fed from lumen side permeates through pores generating micro-sized bubbles uniformly delivered to annular reaction zone where contaminated water be treated flows. Under continuous flow, pH at 3.0 temperature 20 ºC, volumetric coefficient (KLa) ranged 3.5 9.0 min−1 improved increase flow rate (QG, 1.5-fold 0.15 1.0 Ndm3 min−1) liquid (QL, 2.0-fold 50 L h−1), due enhanced turbulence shell-side zone. The efficiency more pronounced QG decreased QL increased, advantageous large-scale applications. main resistances were phase boundary layer (53–76%) (24–47%; kM = (1.14 ± 0.01) × 10−4 m s−1). For an dose 12 g m−3 residence time 3.9 s, removals ≥ 80% achieved 13 19 CECs spiked demineralized (each 10 µg L−1), demonstrating applicability this ozonation treatment. Photocatalytic (O3/UVC/TiO2) did not significantly improve treatment performance low inside contactor.