Cationic Polyacrylamide Precipitation and Flocculation for Treatment of Tannery Wastewater

The cationic polyacrylamide precipitation flocculation method includes neutralization, coagulation, sedimentation and air flotation, which is suitable for small and medium-sized tanneries.

neutralization law
Comprehensive tannery wastewater is alkaline, no matter what treatment method is adopted, it is generally necessary to use a neutralization method to make the wastewater reach the required range for subsequent treatment. The neutralization method is generally divided into the mutual neutralization method of acidic commercial water and alkaline wastewater, the chemical neutralization method, and the over-neutralization method. Among them, the chemical neutralization method using C and DH as neutralizing agents is the most commonly used because of its convenient operation, high efficiency and easy control.

concrete
Add cationic polyacrylamide coagulant to wastewater to coagulate the colloidal particles that cannot settle naturally in wastewater, and achieve the purpose of separating from water by settling or floating. Coagulation goes through two stages of rapid mixing and reaction. Rapid mixing makes the coagulant and wastewater evenly mixed in a short time. Dosing before the water pump mixing pump. The peripheral speed of mechanical stirring and mixing is above 1.5m/; the residence time is <1.0mino, the flow rate of clapboard type mixing is >1.5m/s, and the spacing of clapboards is 0.6~1.0m; the number of mixing pools is 3~4.