Abstract
Wastewater reuse can pose risks due to the presence of heavy metals or pathogen microorganisms. The objective of this paper is to assess the possible environmental and human health risks of treated wastewater when applied to horticultural crops. Results show a high influence of treated wastewater in some soil parameters, such as sodium. Results on growth parameters (dry and fresh weight, average height and diameter) show higher values for plants irrigated with treated wastewater than the control. The contribution of nutrients and organic matter from treated wastewater from the Alcázar de San Juan wastewater treatment plant with no additional mineral fertilizer was not sufficient for the normal development of the lettuce plants throughout the three crop seasons. The presence of pathogen microorganisms in two plots was detected in plants and soil.
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