With the rapid economic development, the environmental pollution caused by the production of chemical products has intensified, and the harm to human health has become increasingly common and serious, especially the organic emissions from the production of fine chemical products (such as pharmaceuticals, dyes, daily chemicals, etc.) Most of the substances are those with complex structure, toxic and harmful, and biologically difficult to degrade. Therefore, the treatment of chemical wastewater is more difficult.
The basic characteristics of chemical wastewater are extremely high COD, high salinity, and toxic to microorganisms. It is a typical refractory wastewater and is currently a research focus and hotspot in water treatment technology.
Characteristics of chemical wastewater:
(1) The water quality has complex components and many by-products. The reaction raw materials are often solvent substances or cyclic compounds, which increases the difficulty of wastewater treatment;
(2) The high content of pollutants in wastewater is caused by the incomplete reaction of raw materials and the entry of a large amount of solvent media used in the production of raw materials into the wastewater system;
(3) There are many toxic and harmful substances. There are many organic pollutants in fine chemical wastewater that are toxic and harmful to microorganisms, such as halogen compounds, nitro compounds, dispersants or surfactants with bactericidal effect, etc.;
(4) There are many refractory biodegradable substances, B is lower than C, and the biodegradability is poor;
(5) High chroma of wastewater.
Chemical wastewater treatment methods Wastewater treatment technology has been developed for more than 100 years. The types of pollutants in sewage and the amount of sewage are increasing with the development of society and economy and the improvement of living standards. The technology of sewage treatment has also evolved with the development of science and technology. Rapid changes have taken place, and at the same time, the old sewage treatment technology is constantly being innovated and developed.