METHOD FOR PRODUCING FERTILIZER BY MEANS OF ELECTRODIALYSIS

A method for producing a fertilizer by means of electrodialysis, comprising: pretreating biogas slurry, removing suspended particulate matters and colloids in the biogas slurry to obtain raw water, and introducing the raw water into a selective electrodialysis system, wherein an ion exchange membrane is arranged in the selective electrodialysis system; and separating the raw water to obtain a divalent anion enriched liquid, a divalent cation enriched liquid, a monovalent ion enriched liquid and desalted water, wherein the desalted water meets a discharge standard. A chemical fertilizer is produced by using the enriched liquid, and the production comprises: adjusting the pH value of the monovalent ion enriched liquid, then carrying out evaporation treatment, absorbing the evaporated gas with sulfuric acid to obtain ammonium sulfate, and crystallizing the evaporated liquid to obtain solid potassium salt. The method effectively solves the problem of resource utilization of the high-salinity concentrated solution