Effects of harvest date, irrigation level, cultivar type and fruit water content on olive mill wastewater generated by a laboratory scale 'Abencor' milling system

► We studied the effects of olive horticultural conditions on olive mill wastewater. ► Irrigation and fruit maturation significantly influenced wastewater properties. ► There was no correlation between fruit water content and wastewater properties. ► The variability of olive mill wastewaters should be considered in their management.