Wastewater conservation and reuse in quality vegetable cultivation: Overview, challenges and future prospects

The serious water scarcity experienced across the globe and the desire for sufficient food production all yearround to combat hunger, poverty and malnutrition necessitate the need for wastewater reuse in irrigation.Wastewater has varied compositions that affect the growth of different crops positively, they may also be asource of dangerous pollutant. Heavy consumption of vegetables have been encouraged for its nutritional andhealth advantages. Hence, their production and cultivation have increased globally. While the nutritional ad-vantage of vegetables is appealing, their high susceptibility to harbor and spread pathogenic microbes call forserious concern. Activities such as transportation, improper handling and packaging amongst others are sourcesof vegetable contamination. Irrigation water and techniques however present greater danger. Agro-industrialwastewater of a ready-to-eat vegetable (RTEv) industry operating a closed system may reintroduce microbes tovegetable gardens. The use of raw domestic wastewater, either black or grey water in vegetable cultivationpresents attendant challenges which must be handled with utmost precaution. This review is focused on thedangers associated with the reuse of agro-industrial and domestic wastewater, precautions required as well aspossible preventive/reduction measures. The possible dangers associated with“crude irrigation techniques”usedin vegetable cultivation in the Southwestern part of Nigeria are presented. This work will no doubt serve as a toolfor policy makers and environmentalists in enlightenment and awareness campaigns in educating most ruraldwellers who are ignorant of these danger