Pre-treatment methods for wastewater from the deep processing of tar
Thread Content
Our company’s tar wastewater and wastewater from further processing were originally sent to the tar-ammonia system, where they entered the wastewater treatment facility along with ammonia vapor. Wastewater from the deep processing of tar includes light oil separation water, steam blowing separation water, and sodium sulfate wastewater. The COD of the wastewater is around 50,000 mg/L, while the volatile phenols are around 12,000 mg/L. This portion of wastewater has a high content of COD that is difficult to degrade, and the sodium sulfate-containing wastewater is high-salt wastewater with a high conductivity. The current wastewater treatment plant is equipped with a membrane system, and it is unable to handle high-salinity and hard-to-degrade tar wastewater, especially sodium sulfate-containing wastewater. Do any experts have any good pretreatment processes for tar wastewater that they could recommend? Thank you
It is recommended to treat them separately: the sodium sulfate wastewater should be treated individually to produce solid sodium sulfate through crystallization. As for the other wastewaters, oil should be removed from them, ammonia should be evaporated, and phenols should be removed; after that, they can be diluted with domestic sewage before further treatment. I wonder if this approach is appropriate
How is tar in water treated, and what is the effectiveness?
What is the total volume of high-salt wastewater? If the daily waste water volume is not high, separate treatment can be considered
In the wastewater resulting from the advanced processing of tar, the source of high salinity is mainly sodium sulfate-containing wastewater. All other types of tar wastewater are sent to a chemical recovery system for the separation of tar and ammonia water. At present, there is no effective method for treating sodium sulfate-containing wastewater; it is temporarily treated before being used to flush slag in steel mills. The amount of high-salt wastewater is 20–25 tons per day, which is not large, but sending it to steel mills is not a sustainable solution
Pre-treatment: oil removal + phenol-amine recovery + biological treatment. I really don’t know how to deal with sodium sulfate wastewater