REDUCING EMISSION OF NUTRIENTS AND PLANT PROTECTION AGENTS FROM HORTICULTURE WITH ADVANCED OXIDATION BY HYDROGEN PEROXIDE AND MEDIUM PRESSURE UV LIGHT
Environmental, economic and legal (e.g., EU Directive 2000/60/EC) reasons make it more and more necessary to reduce emissions of water, nutrients and plant protection agents from horticulture to an absolute minimum. In this contribution we show how the combination of two techniques, both already known in greenhouse cultures, can reduce emissions significantly. Hydrogen peroxide is a disinfectant for irrigation water and treatment with medium pressure UV light is used for disinfection of drain water before reuse. A dosing channel has been developed for an accurate dosage of small amounts of hydrogen peroxide. The operation and control of this dosing channel has been incorporated in a software package for complete manage¬ment of fertigation, irrigation, drain water treatment and reuse. Doses of both UV light and hydrogen peroxide can be regulated for proper treatment of different water qualities at the lowest cost. The effects of different doses UV light and hydrogen peroxide on the elimination of residues of a dozen of commonly used plant protection agents (PPA) in Dutch greenhouse horticulture have been tested and general results are discussed. Combined use of MPUV and hydrogen peroxide gives the following advantages: elimination of organics and microbiological factors potentially hampering growth; elimination or reduction of residues of many PPA and reduce the required dose of UV light for disinfection.
Enthoven , N.L.M. and Zwartveld, D. (2014). REDUCING EMISSION OF NUTRIENTS AND PLANT PROTECTION AGENTS FROM HORTICULTURE WITH ADVANCED OXIDATION BY HYDROGEN PEROXIDE AND MEDIUM PRESSURE UV LIGHT . Acta Hortic. 1034, 71-76
water, recirculation, disinfection, dose, control, MPUV, H2O2