Detoxification Of Aliphatic And
Aromatic Organic Pollutants By Means Of
Catalytic Wet-air Oxidation
Author(s)
A. Pintar, J. Batista & T. Tišler
Abstract
One of the most promising options for removal of toxic and non-biodegradable
organic compounds from industrial wastewaters is destruction of these
contaminants by means of catalytic wet-air oxidation (CWAO). In this study, the
performance of various Ru/TiO2 catalysts to promote oxidation of aqueous
solutions of formic acid, acetic acid and phenol was investigated in a continuousflow
trickle-bed reactor. Oxidation experiments were carried out at T=328-523 K
and total pressures up to 50 bar. Complete oxidation of formic acid was obtained
at mild operating conditions (383 K), and no catalyst deactivation occurred that
could be attributed to the dissolution of active ingredient material. Liquid-phase
oxidation of recalcitrant acetic acid was found to be structure sensitive; the
highest catalyst activity was obtained when the Ru phase on the catalyst surface
prevailed in the zero-valent oxidation state. The employed Ru/TiO2 catalysts
enable complete removal of phenol and more than 99% removal of TOC at
temperatures above 483 K; at these conditions, no carbonaceous deposits were
accumulated on the catalyst surface. In the presence of a Ru/TiO2 catalyst in the
trickle-bed reactor, the toxicity to Daphnia magna and Vibrio fischeri of the
oxidized materials was greatly reduced compared with that of the starting
solutions. However, despite the notable decrease in toxicity, end-product
solutions are generally more toxic than indicated by the concentrations of total
organic carbon remaining in the final solutions.
Keywords: acute toxicity tests, catalytic wet-air oxidation, heterogeneous
catalysis, ruthenium catalysts, titanium oxide, trickle-bed reactor, wastewater
treatment.
Keywords
acute toxicity tests, catalytic wet-air oxidation, heterogeneous
catalysis, ruthenium catalysts, titanium oxide, trickle-bed reactor, wastewater
treatment.
Related Book
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