What is chemical wastewater？

Chemical wastewater refers to the wastewater produced in the production process of chemical plants, such as oily wastewater from the production of ethylene, polyethylene, rubber, polyester, methanol, ethylene glycol, oil tank farms, air separation and air compressor stations, etc. After biochemical treatment, it can generally meet the national secondary discharge standard. Now, due to the shortage of water resources, the water that meets the discharge standard needs to be further advanced after further treatment to meet the requirements of industrial water replenishment and reuse.

As a large water user, chemical plants generally consume several million cubic meters of fresh water annually, and the reuse rate of water is low. Shortages have threatened the production of these industrial water users. In order to maintain the sustainable development of the enterprise and reduce the waste of water resources, reduce the production cost, and improve the economic and social benefits of the enterprise. It is necessary to carry out advanced treatment (tertiary treatment) for chemical wastewater, as the supplementary water for circulating water or the supplementary water for dynamic desalination, so as to realize the reuse of wastewater.

Features:

1. Chemical wastewater has a large amount of discharge and complex components, and the reaction raw materials are often solvent substances or compounds with a ring structure, which increases the difficulty of wastewater treatment;

2. The wastewater contains a lot of pollutants, mainly due to incomplete reaction of raw materials and the use of a large amount of solvents in raw materials or production.

3. There are many toxic and harmful substances, high concentration of organic matter, high salt content, high chroma, high content of refractory compounds, many biorefractory substances, poor biodegradability, and difficult treatment. 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 effects, etc.