Definition and Usage Areas of cationic polyelectrolyte

Cationic polyelectrolyte, During the pumping of the excess activated sludge taken from the settling pool to the filter press or belt-presses, the sludge is dewatered by adding cationic polyelectrolyte to the sludge line.

Cationic polyelectrolyte is widely used in sludge dewatering units of wastewater treatment plants.

In processes where sludge is dewatered with centrifugal decanter, belt press or filter press, the flocculant, which is mixed with the help of a static mixer, is dosed into the pressurized sludge line.

The working principle of the cationic polyelectrolyte product is generally based on the ion exchange between the polymer chain in the aqueous solution and the electrical charges of the solid particles in the suspended solid state. The stable structures of solid particles are disrupted, leading to coagulation or flocculation.

Cationic polyelectrolytes are diluted from 0.05% to 0.1%. The preparation solution is usually 0.5%, as a result of adding the original product to water during mixing. Since the characteristics of the sludge to be dewatered are different, the dosages to be applied are determined as a result of the jar test and operational trials in the laboratory environment.

Usage areas

• Polyelectrolytes used to provide flocculation in waste water treatment systems are divided into two main groups as anionic and cationic polyelectrodes. Although there are nonionic polyelectrolytes, they are not used much. In general, anionic polyelectrolytes combine and precipitate the particles in the waste water in chemical treatment plants.
• Cationic polyelectrolytes are used to increase efficiency during flotation of flocs to be formed in biologically weighted water treatment plants or during dewatering of waste sludge from all treatment plants. Basically, there are various types of polyelectrolytes used in these principles. It is absolutely essential to make the most appropriate use in the system by selecting the polyelectrolyte suitable for the system by performing the jar tests required for the waste water systems by experts. As a result, the treatment system can be operated in a healthy and efficient manner.
• Cationic polyelectrolyte, unlike its anionic form, is generally used in excess activated sludge of biological treatment plants. During the pumping of the excess activated sludge taken from the settling pool to the filter press or belt-presses, cationic polyelectrolyte is added to the sludge line to dewater the sludge.