The large quantities of wastewater generated in the process of glyphosate production can not be recycled effectively now.The experiment showed that the addition of manganese salt into the aqueous solution of glyphosate(Mn2+ / glyphosate=1.0~1.3,pH=4.2~5.6) could precipitate over 96 % of the glyphosate.By adding acid to the precipitation and making the pH of solution less than 2.0,the precipitation could be dissolved and became supersaturated aqueous solution of glyphosate,then glyphosate would crystallize,t...