AOX removal from industrial wastewaters using advanced oxidation processes: assessment of a combined chemical-biological oxidation.
In this paper, the abatement of adsorbable halogenated organic compounds (AOX) from an industrial wastewater containing relatively high chloride concentrations by a combined chemical and biological oxidation is assessed. For chemical oxidation, the O(3)/UV, H(2)O(2)/UV and photo-Fenton processes are evaluated on pilot scale. Biological oxidation is simulated in a 4 h respirometry experiment with periodic aeration. The results show that a selective degradation of AOX with respect to the matrix compounds (expressed as chemical oxygen demand) could be achieved. For O(3)/UV, lowering the ratio of O(3) dosage to UV intensity leads to a better selectivity for AOX. During O(3)-based experiments, the AOX removal is generally less than during the H(2)O(2)-based experiments. However, after biological oxidation, the AOX levels are comparable. For H(2)O(2)/UV, optimal operating parameters for UV and H(2)O(2) dosage are next determined in a second run with another wastewater sample.
Chemical and Biochemical Process Technology and Control, Katholieke Universiteit Leuven, Department of Chemical Engineering, W. de Croylaan 46, 3001 Heverlee, Belgium; Process and environmental technology, Campus De Nayer, J.P. De Nayerlaan 5, 2860 Sint-Katelijne-Waver, Belgium.
J
J
Luyten
K
K
Sniegowski
K
K
Van Eyck
D
D
Maertens
S
S
Timmermans
Sven
S
Liers
L
L
Braeken
D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D054879:Halogenation; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D009930:Organic Chemicals / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000517:prevention & control*
C045076:Fenton's reagent; D009930:Organic Chemicals; D016877:Oxidants; D014874:Water Pollutants, Chemical; D010126:Ozone; D006861:Hydrogen Peroxide; D007501:Iron