Nitrate Removal of Industrial Effluents

We are working to find a solution for Nitrate removal, from an effluent contaminated with Nitrates (1,600 ppm). Nitrate is found as a salt of K+ in the effluent. The effluent water volumes range from 600-800 m3/d. The expectation is to bring the NO3- to 30 ppm. appreciate expertise.