There are many kinds of pesticides and complex water quality of pesticide wastewater.
Its main characteristics are (1) high concentration of pollutants, and chemical oxygen demand (COD) can reach tens of thousands of mg per liter.
(2) high toxicity. In addition to pesticides and in vitro, waste water also contains toxic substances such as phenol, arsenic and mercury, as well as many biodegradable substances;
(3) it has a foul smell and is irritating to the respiratory tract and mucous membrane of people;
(4) unstable water quality and water quantity.
Therefore, pesticide waste water is very serious to the environment.
The purpose of pesticide wastewater treatment is to reduce the concentration of pollutants in pesticide production wastewater, improve the recovery efficiency, and strive to achieve harmlessness.
The treatment methods of pesticide wastewater include activated carbon adsorption, wet oxidation, solvent extraction, distillation and activated sludge.
However, the development of new pesticides with high efficiency, low toxicity and low residue is the development direction of pesticides.
Some countries have banned the production of organochlorine and organo-mercury pesticides, and actively studied and used microbial pesticides.