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Treatment of biorefractory organic compounds in wool scour effluent by hydroxyl radical oxidation

Poole, Andrew J·2004·Water Research
DOI 10.1016/j.watres.2004.06.001
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Abstract

Wool scouring effluent that had been treated with chemical flocculation and aerobic biological treatment (Sirolan CFB effluent) was tertiary treated by hydroxyl radical oxidation to remove residual organic compounds. These compounds impart a high chemical oxygen demand of 500-3000 mg/L and dark colour. However, a H2O2/UV process was found to effectively treat the majority of residual compounds, with up to 75% COD, 85% total organic carbon, and 100% removal of colour (T(480 nm)) achieved. This was despite the effluent being strongly absorbing in the UV region, with a film thickness of 0.21 mm reducing T(254 nm) by 50%. Treatment was unaffected by pH over the range 3-9. H2O2/UV treatment increased the biodegradability of the effluent (5-day biochemical oxygen demand increased from < 10 to 86 mg/L), but a combined chemical and biological process did not increase maximum COD removal or overall process efficiency. The tertiary treated effluent had a final COD in the range 125-750 mg/L, equating to a total COD removal from raw wool scour effluent of approximately 97.5%. This degree of treatment is sufficient for discharge in many, but not all, circumstances.

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  • The extent of combined COD removal achievable with shortest preoxidation plus biological treatment may be limited in some cases, making a longer oxidation period necessary and the following biological process redundant.

    “Nonetheless, the extent of combined COD removal achievable with this strategy may be limited in some cases, making utilization of a longer oxidation period necessary and the following biological process redundant.170”

    From Hybrid Treatment Systems for Dye Wastewater (2007) · cites this paper as [170]

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Research works printed but not linked: 20

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Metadata

Authors
Poole, A. J.
Venue
Water Research
Publisher
Elsevier BV
Published
2004-08
Volume
38
Issue
14-15
Pages
3458-3464
ISSN
0043-1354
DOI
10.1016/j.watres.2004.06.001
Cited by
49
References
0
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)

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