Basic introduction
Cationic polyacrylamide (CPAM) is a kind of polymer coagulant widely used in the field of wastewater treatment. It mainly gathers suspended particles, colloids and organic pollutants in water into larger flocs through electric neutralization, adsorption bridging and flocculation, and promotes their settlement and separation.
Application Scenario
Municipal sewage treatment:
Primary sedimentation: in the primary sedimentation tank, cationic polyacrylamide, through electric neutralization and bridging, rapidly coagulates the suspended particles in sewage into larger flocs, accelerates its settlement and reduces the content of suspended matter.
Secondary treatment: In the secondary treatment (such as activated sludge method, SBR method), cationic polyacrylamide helps to improve the settling performance of sludge, and improve the thickening and dewatering efficiency of sludge.
Sludge dewatering: In sludge treatment process, cationic polyacrylamide is used to improve the dewatering efficiency of sludge, reduce the volume of sludge, and lower the cost of treatment and transportation.
Industrial wastewater treatment:
Chemical wastewater: Cationic polyacrylamide is used to treat high concentration organic wastewater produced in the process of chemical production, removing suspended solids and organic pollutants in the water through flocculation and sedimentation.
Textile wastewater: In textile printing and dyeing wastewater treatment, it is used to remove dyes and suspended particles in the water, purify the wastewater, and reduce the chromaticity and COD (Chemical Oxygen Demand).
Food wastewater: In food processing wastewater treatment, cationic polyacrylamide is used to remove suspended particles, oil and grease and organic matter, and improve water quality.
Other wastewater treatment:
Paper wastewater: In paper wastewater treatment, cationic polyacrylamide is used for flocculation and sedimentation of pulp wastewater, removal of suspended fibers and organic matter, and improvement of wastewater clarification.
Mining wastewater: in mining wastewater treatment, cationic polyacrylamide is used for flocculation and sedimentation of mineral slurry to promote the separation and sedimentation of mineral particles.
Performance Characteristics
Electricity neutralization: cationic polyacrylamide molecular chain with a large number of cationic groups, can neutralize the negative charge of the suspended particles and colloids in wastewater, reduce the electrostatic repulsion between particles.
Adsorption and bridging effect: through the adsorption and bridging effect, cationic polyacrylamide can aggregate the dispersed fine particles into larger flocs and enhance the effect of settlement.
Rapid flocculation and sedimentation: the use of cationic polyacrylamide can accelerate the flocculation and sedimentation of suspended matter, improve the processing efficiency.
Wide range of application: cationic polyacrylamide can maintain good flocculation effect in a wide range of pH value, applicable to a variety of water quality conditions.
Usage
Dissolution and preparation:
Cationic polyacrylamide is usually supplied in the form of powder or granule, which needs to be dissolved and prepared into a certain concentration of solution before use.
When dissolving, it should be added into stirring water slowly to ensure uniform dissolution and avoid lumping. It is recommended to use room temperature water for dissolution.
Control of dosage:
According to the different quality of treated water, the dosage of cationic polyacrylamide needs to be adjusted. Usually through a small test to determine the appropriate dosage.
The specific dosage should be determined according to the actual water quality and treatment requirements, to avoid overuse.
Dosing method:
Cationic polyacrylamide dosing location and method has an important impact on the treatment effect. Generally, multi-point or step-by-step dosing is used to ensure that the coagulant is in full contact with the suspended matter in the water.
Appropriate mixing should be carried out after dosing to ensure that the coagulant is fully dispersed and evenly mixed.
Reaction conditions control:
Factors such as pH value, temperature and stirring speed during the coagulation process will affect the coagulation effect. These parameters should be adjusted according to the actual situation to optimize the coagulation effect.
Specific conditions need to be determined by experiment.