Unfortunately, industrial applications of UV technology are still limited because UV-light transmittance through fluid foods and beverages is extremely low. The food industry is also dealing with different groups of micro-organisms, more chemical components, and more quality and nutrition issues compared to water treatment, where UV light has been used for many years. It is less effective in treating opaque and turbid liquids such as liquid eggs, apple cider, and orange juice, which strongly absorb scattered or reflected light. Consequently, effective UV treatment for liquid-food applications requires development of alternative approaches to those used for water.