Characteristics of wastewater from paper industry

The wastewater from the paper industry is mainly high-concentration organic wastewater and contains pollutants such as lignin, residual alkali, sulfide, and chloride. It is characterized by large amount of waste water, high concentration of COD, high fiber suspended matter in waste water, and containing divalent sulfur element, high color, and odor of thiol.

Process selection

Using the combined technology of waste water grid primary settling tank regulating tank shallow air floatation acidification tank aerobic tank second settling tank decoloring tank to treat the waste water of paper production After passing through the grille, the wastewater enters the primary settling tank and the conditioning tank for pretreatment, and then further removes the suspended matter in the wastewater through efficient shallow air flotation. Finally, it is discharged by the acidification and aerobic biochemical system after treatment.　

Common equipment and pretreatment methods for wastewater treatment in paper mills:

Pretreatment process mainly includes: grid, screen, fiber recovery system, adjusting water quantity and water quality, and other process components. Different pre-sewage treatment methods can be adopted according to different papermaking industry sewage water quality to remove a part of pollutants, improve the sewage water quality, and achieve the best treatment effect of the entire sewage treatment equipment system.