Abstract
Excessive nitrate content in drinking groundwater is one of the sources of nitrate-nitrogen that threatens human health all over the world. Nitrate-nitrogen reduction technology is categorized into membrane filtration, electro-dialysis, ion exchange, adsorption, chemical methods, and biological methods according to the principle of elimination from water. In particular, an adsorption technique is the most popular and common process because of its cost effectiveness, convenience, and effective adsorption. In this review, the application of conventional adsorbents used to reduce nitrate-nitrogen from drinking water is discussed and novel technologies on nitrate-nitrogen removal are introduced. Furthermore, the recent development of novel nitrate-nitrogen adsorbents from biopolymers such as chitosan and agricultural and industrial byproducts is reviewed.
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