How can sedimentation tanks be used in wastewater treatment in paper mills?

Sedimentation tanks are mainly used in the primary treatment and secondary treatment stages in the paper mill wastewater treatment process. The specific applications are as follows:

1. Primary treatment
In the primary stage of paper mill wastewater treatment, sedimentation tanks are mainly used to remove large suspended solids and sediments in wastewater. The wastewater first flows through a grid or screen to remove large solids and impurities. Then it enters the sedimentation tank. In the sedimentation tank, the wastewater is stilled, allowing the heavy suspended solids to have enough time to sink to the bottom of the tank and form a sludge layer.

2. Secondary treatment
After primary treatment, the wastewater enters the secondary treatment stage. At this stage, the sedimentation tank is usually combined with a biological treatment system. The biological sludge generated during the application of biological treatment is separated and concentrated in the sedimentation tank. The wastewater flows slowly through the sedimentation tank, allowing the microbial flocs to settle to the bottom of the tank, thereby physically separating the clean water from the wastewater. This process not only removes more suspended solids, but also reduces the content of organic matter.

Therefore, the sedimentation tank plays an important role in the wastewater treatment process of paper mills. It effectively removes suspended solids and sediments in the wastewater through a simple physical process, laying a good foundation for subsequent deep treatment and sludge treatment.

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