Efficiency of Ozone-Based Advanced Oxidation Processes in Treating Recirculating Irrigation Water

Date

2020-01-30

Authors

Bertrand, Brenden

Journal Title

Journal ISSN

Volume Title

Publisher

University of Guelph

Abstract

The efficacy of using ozone, ultraviolet, and an ozone/UV-based advanced oxidation process (AOP) for the remediation of recycled greenhouse irrigation water was examined. Begonia x heimalis and Gerbera jamesonii were grown for a full crop cycle – no differences were found between the treatments. Lemna minor was used as a bioassay surrogate for vascular plants and cultured in Hoagland’s solution containing various concentrations of glyphosate and paclobutrazol to determine an EC50. Lemna were then cultured in solution drawn from the treatment system reservoirs spiked with the EC50 dose of glyphosate during an irrigation cycle. Recovery of some metrics was observed in O3 and AOP treatments. A dose of 0.78mL L-1 glyphosate was applied to the irrigation reservoirs at the start of a plant growth cycle of Salvia splendens. The systems were not able to protect from the challenge at the rates of herbicide applied.

Description

Keywords

advanced oxidation process, hydroponics, greenhouse

Citation