NOVELTY - Processing phosphonomethyl iminodiacetic acid wastewater comprises adding wastewater into a centrifuge, washing, drying and filtering; conveying filtering solution into depositing tank and adding flocculating agent; processing hydrolysis reaction on calcium carbide in water in an acetylene generator with calcium carbide; adding liquid supernatant of depositing tank or water into acetylene generator; and discharging un-reacted calcium carbide in concentrated slag slurry and overflowing diluted slag slurry, filtering and conveying return water into depositing tank.    USE - Method for processing phosphonomethyl iminodiacetic acid wastewater for manufacturing glyphosate.    ADVANTAGE - The generating technique of acetylene generation is regulated so as to realize the cyclic utilization of water resource and realize the zero discharging of phosphonomethyl iminodiacetic acid wastewater. The method is environmental-friendly, reduces the pressure and meets the national policy of energy conservation and emission reduction.    DETAILED DESCRIPTION - Processing phosphonomethyl iminodiacetic acid wastewater comprises dehydrogenizing, condensing and processing oxidation reduction. The phosphonomethyl iminodiacetic acid is generated by diethanol amine through dehydrogenizing, acidifying, condensing and processing neutralization reaction. The neutralization reaction generates the phosphonomethyl iminodiacetic acid wastewater. The method comprises:    (A) adding phosphonomethyl iminodiacetic acid wastewater into a centrifuge, washing, drying and filtering; conveying the filtering solution into a mother solution depositing tank and adding flocculating agent to remove the impurities contained in wastewater; and then transferring the liquid supernatant of mother solution depositing tank into a depositing tank through a mother solution pump;    (B) processing hydrolysis reaction on calcium carbide in water in an acetylene generator with calcium carbide, in which the generated acetylene gas overflows from top of generator; when temperature of acetylene generator is raised to 75-85 degrees C, opening an overflowing valve of the acetylene generator to overflow the water in acetylene generator; adding liquid supernatant of depositing tank or water into the acetylene generator; controlling the temperature of acetylene generator by adding amount of water so as to keep the temperature at 85-95 degrees C; and    (C) discharging the un-reacted calcium carbide in concentrated slag slurry generated by the hydrolysis reaction from bottom of acetylene generator; overflowing the diluted slag slurry on upper layer of the concentrated slag slurry from an overflowing pipe in the middle of acetylene generator; filtering the diluted slag slurry by a plate frame filter and conveying the return water into the depositing tank; adding flocculating agent into the depositing tank to remove the solid in the return water, in which the liquid supernatant in the depositing tank is water; and continuously conveying the liquid supernatant into the acetylene generator as water for reaction.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a device used for processing phosphonomethyl iminodiacetic acid wastewater.