Recent advances and perspectives in the treatment of hydroponic wastewater

Research by A. Richa, S. Touil and M. Fizir highlights the recent developments in the treatment of hydroponic wastewater. The rapid development of hydroponic farming produces a large amount of wastewater rich in nutrients and organic matters thus imposes great harm to humans and the environment if the waste nutrient solution is not correctly treated.

The objective of the review is to present information concerning hydroponic systems, including the different classes and methods of operation; advantages and drawbacks, and the recent approaches and development in hydroponic wastewater treatments.

A particular emphasis has been placed on the removal of root exudates from reused waste nutrient solution in a closed system. The reviewed technologies for nutrient removal or recovery include denitrification, microalgae cultivation, constructed wetlands and activated carbon methods.

The alternative byproducts i.e. biogas as agriculture fertilizer for hydroponic cultivation to attain sustainable agriculture was further highlighted. In addition, current challenges and future prospects in this field are carried out.

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