The dosage of polyacrylamide (PAM) in different fields needs to be adjusted according to factors such as water quality, process, molecular weight, etc. The following is the reference range and key information integration of typical application scenarios:
1. Water treatment field
Industrial wastewater treatment
Coal washing wastewater: The dosage is about 30-110 kg/thousand tons of wastewater. It is necessary to select a cationic or anionic type with a molecular weight of 12 million to 16 million according to the water quality15.
Chemical wastewater: The dosage is generally 50-120 kg/thousand tons of wastewater, which needs to be adjusted according to the type of pollutants18.
Bleaching/dyeing/papermaking wastewater: Due to the complexity of pollutants, the dosage is relatively high, about 100-300 kg/thousand tons of wastewater18.
Electroplating wastewater: It is recommended not to exceed 50 kg/thousand tons of wastewater to avoid excessive impact on water quality18.
Urban sewage and sludge dehydration
Sludge dehydration: The recommended dosage of cationic type (ionic degree 40-50) is 4 kg/ton of dry sludge, which needs to be adjusted in combination with sludge moisture content, filter pressing process, etc. 810.
Domestic sewage: Usually the solution is prepared at a concentration of 0.1-0.2%, and the dosage is 2-5 g/ton of water (such as biochemical process) 713.
2. Mining and construction fields
Mineral processing and sand washing
Coal sludge water treatment: The dosage of anionic type is about 4 g/ton of water, which needs to be adjusted in combination with flocculation effect 10.
Sand and gravel sand washing wastewater: The dosage is about 5-10 g/ton of water, which can significantly improve the sedimentation efficiency 36.
Concrete additives
When used as a thickener, it is usually added at a ratio of 1.2 kg/ton of concrete, and a high molecular weight model needs to be selected to increase viscosity 10.
3. Oilfield and Agriculture
Oilfield Exploration
When used to enhance the permeability of oil layers, the amount of cationic type needs to be determined through experiments, and usually the adsorption stability and oil well conditions need to be considered16.
Soil Improvement
When preventing soil erosion, the recommended application amount is 10 mg/kg soil (US standard), which needs to be dynamically adjusted in combination with soil salinity12.
4. Other Industrial Applications
Paper Retention/Filtration Aid: The dosage is about 5-10 g/ton of pulp, which can increase the fiber retention rate1015.
Food/Cosmetics Thickening: Prepare the solution at a concentration of 3‰, and the specific dosage needs to be adjusted according to the product viscosity requirements14.
Precautions
Dissolution and Concentration: PAM needs to be prepared into a 0.1-0.2% solution for use. Insufficient or excessive dissolution will affect the effect711.
Molecular Weight Selection: For example, it is recommended to use a molecular weight of 8 million to 12 million for sludge dewatering, while industrial wastewater requires a higher molecular weight515.
Dynamic adjustment: The actual dosage needs to be determined through beaker experiment combined with water quality testing to avoid excessive dosage leading to increased costs or secondary pollution28.
