There are many kinds of pesticides, and the quality of pesticide wastewater is complex. Its main features:

      (1) The concentration of pollutants is high, and the chemical oxygen demand (COD) can reach tens of thousands of mg per liter;

      (2) The waste water contains not only pesticides and intermediates, but also phenol, arsenic, mercury and many other toxic substances which are difficult to degrade;

      (3) Have fetid, have irritative sex to human respiratory tract and mucous membrane;

      (4) Water quality and quantity are not stable. Therefore, the pollution of pesticide wastewater to the environment is very serious. The purpose of pesticide wastewater treatment is to reduce the concentration of pollutants in pesticide production wastewater, improve the recovery rate, and strive to achieve harmless. The treatment methods of pesticide wastewater include activated carbon adsorption, wet air oxidation, solvent extraction, distillation and activated sludge. However, the development of new pesticides with high efficiency, low toxicity and low residue is the direction of pesticide development. Some countries have banned the production of organochlorine and organomercury pesticides such as BHC, and actively studied and used microbial pesticides, which is a new way to fundamentally prevent pesticide wastewater from polluting the environment