Wet oxidation properties of process waste waters of fine chemical and pharmaceutical origin

Abstract

Wet oxidation was carried out for treating different industrial process wastewaters (PWW's) of pharmaceutical production, with oxygen in a stainless steel autoclave at 230 and 250°C and total pressure of 50 bar. Beside non-catalytic, a catalytic reaction was also carried out. The catalyst applied was Ti mesh covered with Ru and Ir oxide. PWW samples were analyzed with respect to their TOC, COD (BOD) content. The tested PWW's could be oxidized but with rather different conversions. Some effluents were converted with remarkable rate due in some cases to their Fe or Cu ion content, in other cases to the Ti based precious metal oxide catalyst.

Complex Treatment for the Disposal and Utilization of Process Wastewaters of the Pharmaceutical Industry

“…The catalysts were characterized beside oxidation measurements with PGAA (prompt gamma activation analysis), TPR (temperature programmed reduction), SEM-EDX (scanning electron microscopy, with energy dispersive X-ray spectroscopy), ICP-MS (inductively coupled plasma mass spectrometry) and XPS (X-ray induced photoelectron spectroscopy) [14].…”

Pharmaceutical removal from water with iron- or manganese-based technologies: A review

“…Wet oxidation is the oxidation of organic and inorganic substances in an aqueous solution or suspension by means of oxygen or air at 200 C-320 C and 2-20 MPa either in the presence or absence of catalysts (Levec and Pintar, 2007;Wang et al, 2007;Klavarioti et al, 2009;Kong et al, 2012). Wet oxidation includes wet air oxidation and wet peroxide oxidation and is used as a pretreatment technology for pharmaceutical wastewater (Melero et al, 2009;Hosseini et al, 2011;Zheng, 2011;Zhan et al, 2013). Results show that Fe and Mn (together with Ce, Pt, or C) can catalyze wet oxidation for phenolic compounds removal (Santiago et al, 2006;Rey et al, 2009;Collado et al, 2010;Garrido-Ramirez et al, 2012).…”

Wet Air Oxidation of Aqueous Wastes

“…In all real PWW and in the reaction mixtures of wet oxidation in stainless steel autoclaves, Fe ions are present with measurable concentration [17][18][19]. These ions and other transition metal ions present accelerate the decomposition of peroxide to HO radicals in Fenton-type processes.…”