TNO is developing photocatalytic oxidation (PCO) as a possible new, sustainable water treatment and purification method for greenhouse horticulture. In PCO processes, inert, non-toxic, inexpensive catalysts (such as TiO2) are used in combination with oxygen (from air), water, and UV-A light to generate OH radicals. The radicals have a strong oxidative effect and can purify water and break down pesticides.
Photocatalytic oxidation (PCO) uses inexpensive, non-toxic catalysts, and UV-A light to create radicals. These radicals can kill germs and break down organic substances. TNO research, in collaboration with PT, Priva TTO, and WUR, has demonstrated that daylight-driven PCO can break down more than 90% of pesticides. Effectiveness and costs are competitive with conventional techniques. PCO also has a wide range of applications in the greenhouse and therefore opens the way for new additional sterilization/decomposition concepts. Use of artificial light reduces the required surface areas.
Competitive relative to conventional techniques: