Reduction treatment method for nitrates in water

The invention belongs to the technical field of water treatment, and relates to a reduction treatment method for nitrates in water. Green rust LDH (Layered double hydroxides) are fed into nitrate-containing wastewater to react, so that the reaction rate thereof on reducing nitrates in water and the partial removal of total nitrogen are effectively improved. According to the invention, nitrates are subjected to reduction treatment by using the reducibility of green rusts, and then under the action of catalyst ions, part of the LDH is transferred into an environmental-friendly gas N2, so that the reaction time is short, and more than 95% of the nitrates can be removed within 4h; the removal rate of total nitrogen is more than 35%; the method is good in iron cement sedimentation and simple in operation, and has good economic and environmental benefits.