TCCA (trichloroisocyanuric acid) mother liquor wastewater treatment method

The invention belongs to the technical field of wastewater treatment and discloses a TCCA (trichloroisocyanuric acid) mother liquor wastewater treatment method. The TCCA mother liquor wastewater treatment method is mainly technically characterized by comprising the following steps: wastewater is regulated by a regulation tank and then enters a chlorinolysis tank, hydrochloric acid is added to the chlorinolysis tank, hypochlorite is removed, treated water enters a dechlorination tank, produced chlorine enters a nitrogen removal tank in the step 3, and small amount of sodium bisulfite is added to the dechlorination tank to remove redundant hypochlorite; alkali is added to precipitate melamine cyanurate, the precipitated melamine cyanurate is recovered, chlorine is introduced into the nitrogen removal tank, ammonia and excessive chlorine react to produce nitrogen which is exhausted, then sodium sulfite is added to remove excessive hypochlorite, finally, evaporative crystallization is performed, coarse salt which is separated out is collected, and evaporated condensate is discharged up to standard. According to the TCCA mother liquor wastewater treatment method, cyanuric acid is recovered, the energy consumption for wastewater treatment is low, salt is purified and recovered completely, investment for recovery equipment is small, and the hazardous waste amount is reduced.