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...

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Veröffentlicht in:Water science and technology 2013-01, Vol.68 (9), p.2048-2054
Hauptverfasser: LUYTEN, J, SNIEGOWSKI, K, VAN EYCK, K, MAERTENS, D, TIMMERMANS, S, LIERS, Sven, BRAEKEN, L
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Sprache:eng
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Zusammenfassung: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2013.459