Fluorine-containing wastewater: At present, the treatment methods for fluorine-containing wastewater mainly include coagulation precipitation method, electrodialysis method and ion exchange method. In the coagulation method, PAM is often used to enhance the effect of fluorine removal. For the wastewater containing about 200mg / L of fluorine, adding the appropriate amount of calcium hydroxide and polyaluminum chloride, and then adding the appropriate amount of calcium salt, phosphoric acid and PAM to remove fluorine can achieve good results. In addition, calcium carbide slag and PAM can also be added to treat the fluorinated industrial wastewater. PAM promotes the formation of flocs through adsorption bridging, improves the sedimentation rate, improves the sedimentation performance, and thus strengthens the effect of fluorine removal.
Iron and steel smelting wastewater: a large amount of dedusting water is produced during the converter steelmaking process, generally the SS is 2-20g / L and the PH is 9-12. Most domestic steel mills recycle dust treatment water to reduce costs. In order to avoid scaling and corrosion in the system, PAM is generally used as the flocculant, and the process of wastewater → mixing → reaction → precipitation is adopted, which can achieve a good removal effect on suspended solids.
Coal slime water: Coal slime water is industrial waste water produced by wet coal preparation. It contains a large amount of coal slime and sediment, and is discharged into the water without treatment. It deposits the bottom of the water, silts the river channel, and pollutes the river water. One of the sources of loss. In view of the difficulty of natural settlement and mechanical dewatering of high-muddy slime water, joint treatment with calcium carbide slag and PAM can be used to make the particles form larger flocs and accelerate the settlement rate.
In the next section, we will discuss the application of acrylamide polymers in the oil and gas field industry.