How to treat phenol-containing wastewater?
We all know that the oil refining, chemical, explosive, resin, coking and other industries will discharge phenol-containing wastewater. Among them, the wastewater discharged from the local coking process contains a relatively high concentration of phenol; in addition, mechanical maintenance, casting, papermaking, textiles, ceramics, coal gas And other industries also discharge a large amount of phenol-containing wastewater. So, how to deal with phenol-containing wastewater?
The treatment methods of high-concentration phenol-containing wastewater include extraction, activated carbon adsorption and incineration, and the treatment methods of medium-concentration phenol-containing wastewater include biological method, activated carbon adsorption method and chemical oxidation method. In the absence of high concentrations of other toxic substances or the removal of toxic substances in advance, phenolic compounds can be effectively decomposed by microorganisms. Therefore, for medium-concentration phenol-containing wastewater, the activated sludge method or the biofilm method are both effective methods. Low-concentration phenol-containing wastewater can also be treated by methods such as ozone oxidation or activated carbon adsorption.
1. Physicochemical method. Physicochemical method is a method to treat wastewater and remove pollutants through physical and chemical processes. Because of its wide application, it has developed rapidly in recent years. The main methods are: adsorption, extraction, reverse osmosis, electrodialysis, liquid membrane, gas stripping, ultrafiltration and other methods.
2. Chemical method, chemical treatment method is a method that uses chemical reactions between substances. The treatment of petrochemical wastewater is a promising and efficient method. Among chemical methods, neutralization method, precipitation method, oxidation method, reduction method, electrolysis method, photocatalysis method, etc. are commonly used.
3. The biochemical method uses microorganisms in the water to clean sewage. They use organic pollutants in the water as their nutritional food, and through the processes of adsorption, absorption, oxidation, and decomposition, the organic matter becomes simple inorganic matter. It not only satisfies the needs of microbial reproduction and life activities, but also purifies sewage.
Volatile phenols are organic substances that are easily biodegraded. The main pollutants of some sewage are volatile phenols. Our Company uses biological methods to treat them. Under the normal operation of the secondary biological treatment system, the effluent from the secondary sedimentation tank will volatilize The phenol content can meet the national emission standards. Therefore, in the operation of conventional sewage treatment, the volatile phenol content of the discharge outlet should be monitored. If it exceeds the standard, it means that there is a problem with the biological treatment system or the concentration of phenolic compounds in the incoming water is too large. At this time, it needs to be adjusted to enter the biological treatment. The sewage water quality or other parameters of the system.