brief introduction

        Chemical industry includes organic chemical industry and inorganic chemical industry. There are many kinds of chemical products with complex components. The wastewater discharged from chemical plants is called chemical wastewater. There are many kinds of chemical wastewater, most of which are highly toxic, not easy to purify, have a certain accumulation in organisms, and have obvious oxygen consumption in water body, which is easy to deteriorate the water quality.

Types of chemical wastewater

        1、 It is organic wastewater, mainly from the basic organic raw materials, synthetic materials, pesticides, dyes and other industries;

        2、 Wastewater containing inorganic substances, such as inorganic salts, nitrogen fertilizer, phosphate fertilizer, sulfuric acid, nitric acid and soda ash, etc;

        3、 For both organic and inorganic wastewater, such as chlor alkali, photographic materials, coatings and other industries.

Characteristics of wastewater

        1、 The concentration of organic pollutants is high.

        2、 There are more nitrogen and phosphorus nutrients.

        3、 High salinity. Dye industry, chemical pesticides, petroleum refining and other industries discharge high salinity wastewater.

        4、 There are many refractory substances, low BOD / COD and poor biodegradability;

        5、 High salinity. Dye industry, chemical pesticides, petroleum refining and other industries discharge high salinity wastewater.

        6、 The pH value is unstable.