Treatment process of agrochemical high-concentration salt-containing wastewater

The invention relates to the field of wastewater treatment and specifically relates to a treatment process of agrochemical high-concentration salt-containing wastewater. The treatment process comprises the following steps: filtering the agrochemical high-concentration salt-containing wastewater, then regulating the pH to 7-8, and uniformly stirring; pumping the wastewater into an MVR (mechanical vapor recompression) evaporation, adding catalysts, namely sodium nitrite and hydrogen peroxide, introducing oxygen, and evaporating till saturation at the evaporation temperature of 90-100 DEG C; and transferring a saturated concentrated solution into a crystallization kettle for concentration and crystallization, separating out sodium chloride, then separating, and returning liquid after separation into the MVR evaporation for applying mechanically. The treatment process provided by the invention has the beneficial effects that the process adopts the special catalysts and equipment, the removal rate of COD (chemical oxygen demand) in the wastewater can be as high as 98%, the removal rate of ammonia nitrogen can be as high as 96%, the B/C value of the wastewater can achieve 0.40, the biochemical property of the wastewater is relatively high, the further treatment can be performed, water resources are enriched, and the content of sodium chloride in residues can be as high as 98.38% and is in line with the industrial salt standard; furthermore, by combining the MVR with the method, the MVR can only consume electric energy, 25-35 degrees of electricity can be consumed for evaporating 1 ton of wastewater, and the energy is further saved.