After adding PFS, the sludge floats up in the tank. In addition to eliminating the causes of poor coagulation effect and sludge floating caused by quality problems such as the content and alkalinity of PFS itself, it is necessary to coagulate the suspended solids into alum precipitation after coagulation and put them into the mud. Why does it lead to sludge floating? The following polymerized ferric sulfate manufacturers will give you an analysis of the causes of sludge floating.

1. The dosage is too large. Under the same conditions, when using the same amount of polyaluminum and polyferric sulfate, due to their different contents and effects, too many or too few reagents may be used. The coagulated sludge floats up.

2. Improper selection of coagulant aids, the coagulant aids here are mainly poly (propylene amide). There are many kinds of PAM, and the matching PAM model also has a great influence on the formation of flocs, which may lead to the situation that the sludge can not agglomerate or loosen and will float up under the action of water flow.

3. The sludge is not discharged in time, the do in water is insufficient, and the nitrogen removal reaction of activated sludge produces gas, which makes the sludge formed after adding polyferric sulfate float up.

4. In the aeration tank, due to the sudden increase of backflow, the sludge particles formed rise with the bubbles or flow into the sedimentation tank.

5. Due to the sudden increase of water quantity, the residence time of wastewater in the sedimentation tank is insufficient, and some sludge can not settle in time.

6. Due to the sludge aging, carbon dioxide, hydrogen, methane and other gases are produced in the bottom of the tank, which makes the lighter sludge float up with it.

In addition, filamentous bulking, incomplete sludge discharge and sludge poisoning may also lead to sludge floating in the secondary sedimentation tank. In this case, according to the microscopic examination of sludge and the observation of its shape, water quantity and other conditions, we can preliminarily determine the cause of sludge floating, and formulate corresponding treatment measures. Polyferric sulfate belongs to inorganic macromolecular ferric salt. In wastewater flotation treatment, aluminum salt is more important in water treatment industry, while iron salt is more used for precipitation treatment.