This section was developed using information and original text from the Zebra Mussel (Dreissena polymorpha) Control Handbook for Facility Operators.
UV light (wavelengths between 40° and 4,000°) is a prospective zebra mussel control method. Chalker-Scott et al. (1993) found that not only are zebra mussel veligers sensitive to UV-B radiation (2800° - 3200°), but also adult zebra mussels were sensitive, provided that the radiation was applied constantly. EPRI (1992) reported that veliger mortality was 42-percent after 1 hr, 85-percent after 2 hr, and 100-percent after 4 hr exposure to UV-B radiation.
EPRI (1992) states that large UV units are now available that can treat flow rates of up to 2.5 m3/sec. UV lamps can be installed in an intake bay or a pipe, perpendicular to the flow or along sidewalls, to control zebra mussels. Water with high suspended loads and high turbidity limits the depth at which light wavelengths can penetrate the water column, reducing the effectiveness of UV light. UV light is most applicable in medium-sized service water systems, and other smaller raw water systems.
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