Integrierte Vermeidung und Verminderung der Umweltverschmutzung

6 EMERGING TECHNIQUES
Chapter 6
This chapter includes novel pollution prevention and control techniques that are reported to be
under development and may provide future cost or environmental benefits. If available, the
information includes the potential efficiency of the techniques, a preliminary cost estimate, and
an indication of the time-scale before the techniques might be commercially “available”.
Established techniques in other sectors that are emerging in practice within the FDM sector are
not included.
6.1 Use of UV/ozone in absorption for odour abatement
Description
Ozone has been used historically as an oxidant in only a limited number of odour control
applications. This is primarily because, although it is extremely reactive in the liquid phase, its
reactivity in the gaseous phase is lower. A process was developed during the 1980s that
enhanced the activity of ozone by the incorporation of UV light. The process uses a
conventional packed bed system and a liquid recycle system. Ozone is bubbled into the sump of
the absorber and the ozonated water is passed through a bank of UV lamps. Ozone in the
presence of UV light produces hydroxyl radicals which are far more reactive than ozone alone.
Dissolved organic compounds in the liquid phase are oxidised to carbon dioxide and water and
thus the absorber liquor discharged from the system is relatively clean.
Achieved environmental benefits
Reduced odour emissions.
Applicability
Ozone systems have not been effective when applied to hot and humid airflows, e.g. when
applied to a poultry processor scald tank vent.
Reference literature
[34, Willey A R and Williams D A, 2001]
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