Chemical industry wastewater can be divided into: organic wastewater, mainly from basic organic raw materials, synthetic materials, pesticides, dyes, and other industries; inorganic wastewater, such as inorganic salts, nitrogen fertilizers, phosphate fertilizers, sulfuric acid, nitric acid, and soda ash, etc.
Wastewater discharged from the industry; wastewater containing both organic and inorganic substances, such as chlor-alkali, photosensitive materials, coatings and other industries.
The main methods to treat high-concentration refractory organic wastewater are chemical oxidation, extraction, adsorption, incineration, catalytic oxidation, biochemical, etc., but only the biochemical process is mature, the equipment is simple, the processing capacity is large, and the operating cost is low. It is also the most widely used method in wastewater treatment.
