Home > International Symposium on New Technologies and Management for Greenhouses – GreenSys2015 > Double use of water treatment in soilless growing systems: disinfection of recirculating solution and removal of plant protection products from discharge water

Articles

Double use of water treatment in soilless growing systems: disinfection of recirculating solution and removal of plant protection products from discharge water

Article number

1170_71

Pages

571 – 588

Language

English

Abstract

Worldwide increase of water shortage and competition for fresh water is raising the awareness that an increase in water use efficiency in horticulture is a necessity.
At the same time, environmental awareness and legislation (e.g. the EU Water Framework Directive 2000/60/EC) restricts the emissions of nutrients and plant protection products (PPPs). In the Netherlands in soilless growing systems much effort is put into measures to enable maximal recycling of nutrient solutions, thereby decreasing the required amount of fresh water needed and the emission of nutrients and PPPs.
Recycling of water fluxes also implicates that the drain water has to be disinfected to prevent rapid dispersal of pathogens.
Heat treatment, filtration, Ozone and UV treatment are commonly used disinfection technologies.
Some of these technologies (Ozone and UV) are known for their ability to break down PPPs and therefore their joint application (disinfection and end-of-pipe purification of discharged drain water) have been studied.
In this paper we present the results of the integration and optimisation of ozone technology in a cucumber and a sweet pepper soilless cultivation.
An Agrozone ozone unit that alternately treated the recycled nutrient solution for the elimination of pathogens and removed PPPs from discharge water was investigated.
The ozone unit eliminates pathogens and PPPs by direct oxidation of organic material batchwise.
It was shown that both disinfection of the recirculating nutrient solution and removal of PPPs from discharge water are possible with the same ozone equipment, if installed correctly.
Preliminary tests with Tomato Mosaic Virus have shown that this technology can completely disinfect (from 402 to 0 lesions per plant), and remove up to 98% of PPPs from standardised greenhouse discharge water.
For disinfection purposes shorter treatment times and lower ozone doses can be applied.

Publication

International Symposium on New Technologies and Management for Greenhouses – GreenSys2015

Authors

J. van Ruijven, E. van Os, I. Stijger, E. Beerling, C. de Haan

Keywords

pesticides, ozone, greenhouse horticulture, drain water, standardised water, ORP

Full text

https://doi.org/10.17660/ActaHortic.2017.1170.71

Online Articles (151)

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67. Reduction in cold season greenhouse heating fuel via recovery of excess solar heat with heat pumps

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68. CO₂ supply to a greenhouse from the combustion of vegetal waste

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70. A survey to evaluate safety in protected crops in western Sicily

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71. Double use of water treatment in soilless growing systems: disinfection of recirculating solution and removal of plant protection products from discharge water

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72. Land analysis of agricultural plastic waste production in a South Italy area by means of a geographical information system

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M. Yakovtseva | G. Govorova | I. Tarakanov

131. Proline test to evaluate light stress in tomato seedlings under artificial light

E.M. Almansa | R.M. Chica | B.M. Plaza | M.T. Lao-Arenas

132. Factors influencing the efficacy of insect-proof screens

R.M. Oliva | A.J. Álvarez

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A.J. Álvarez | R.M. Oliva

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M. Nannini | F. Atzori | F. Musio | R. Pisci | M. Porcu

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B.R. Harlan | L. Granke | M.K. Hausbeck

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T. Jishi | T. Komatsu | S. Yasuoka

137. Cover crops as a part of organic greenhouse rotation: implication on soil arthropods dynamics

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N. Katsoulas | O. Kaltsa | N. Rigakis | E. Kitta

139. Climate characterization under protection facilities in the American inter-tropical region

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150. The effect of grafting on salinity tolerance in cucumber plants grown in perlite

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151. Development and validation of two crop photosynthesis monitoring systems to support greenhouse climate control