In the water industry, polyacrylamide could be used in three areas: raw water treatment, sewage treatment, and industrial wastewater treatment. For raw water treatment, polyacrylamide is used as a flocculant to treat the suspended particles in the raw water. For the sewage treatment, polyacrylamide is used in the dewatering of sludge. For industrial wastewater treatment, polyacrylamide is used alone or in combination with other drugs to treat the wastewater of industrial production.
Polyacrylamide has the role of precipitating agent and stabilizer. In the treatment of tailings, polyacrylamide acts as precipitating agent and bridge the organic colloidal particle and water-soluble substance. After the bridging, the sedimentation efficiency is greatly increased. In the mining process, polyacrylamide acts as stabilizer to prevent the sediment and coherence of rock particle, which help keep the stability and mobility of ore pulp. The mining efficiency and mineral recovery rate are both increased.
In the oil exploitation area, polyacrylamide is used in the drilling process and oil recovery process. In the drilling process (well drilling, well completion and well cementing), polyacrylamide is used in the drilling fluid, completion fluid and cementing fluid. In the oil recovery process (fracturing and intensified oil recovery), polyacrylamide is used in the fracturing fluid and polymer flooding agent.
Papermaking Polyacrylamide is used as retention agent, filter aid and leveling agent. It could help improve the quality of paper, improve the pulp dewaterability, increase the retention rate of fiber fines and packing, reduce the consumption of raw material and reduce the pollution to the environment. The roles of polyacrylamide depend on the molecular weight, ionic property, ionic strength and the activity of other copolymer.
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