Rapid development of hydroponic farming which is soilless cultivation method of growing plant using mineral nutrient solution dissolved in water produces large amount of wastewater rich in nutrients and organic matters thus imposes great harms to human and environment, if the waste nutrient solution is not correctly treated. The objective of this 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. Particular emphasis has been placed on removal of root exudates from reused waste nutrient solution in closed system. The reviewed technologies for nutrient removal or recovery include denitrification, microalgae cultivation, constructed wetlands and activated carbon methods. The alternatives 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. About 118 published studies are reviewed in this paper. It is evident from the literature survey articles that activated carbon is the most frequently studied for the nutrient recovery of hydroponic wastewater.

水耕法的迅速发展是一种无土栽培方法，即使用溶解在水中的矿质营养液来种植植物，如果不正确处理这些营养液，则会产生大量的富含营养成分和有机质的废水，从而对人类和环境造成巨大危害。审查的目的是提供有关水耕系统的信息，包括：不同的类别和操作方法；优点和缺点以及水培废水处理的最新方法和发展。在封闭系统中，特别着重于从重复使用的废物营养液中去除根系分泌物。营养素去除或回收的经过审查的技术包括反硝化，微藻栽培，人工湿地和活性炭方法。进一步强调了替代副产品，即沼气作为用于水培法以实现可持续农业的农业肥料。此外，该领域的当前挑战和未来前景得以实现。本文综述了约118篇已发表的研究。从文献调查文章中可以明显看出，活性炭是水培废水养分回收的最常研究的领域。