The coal-washing process produces a large amount of wastewater. These wastewaters contain a large amount of suspended solids, coal slime and other organic matter, if they are directly discharged into the environment without treatment, they will cause serious pollution to the environment. Therefore, coal-washing plant wastewater must be treated to reduce the impact on the environment. Polyacrylamide is an essential water treatment chemical for coal-washing plant wastewater treatment.
Application of polyacrylamide in coal washing plant wastewater treatment:
1. Precipitation treatment.
After the pretreatment of the water treatment system, the wastewater enters the sedimentation tank for treatment. In this step, anionic polyacrylamide can be added as a flocculant, so that the fine particles suspended in the water can be flocculated into larger particles quickly to form flocs and precipitate. After a period of precipitation, the flocs gradually sink, while water flows out from the upper part, and can be used again after further treatment.
2. Sludge treatment.
Generally, cationic polyacrylamide is used for sludge dewatering. Through the high-speed rotation of the centrifuge, the water in the sludge is separated to form a solid sludge cake.
To sum up, the wastewater from the coal washing plant can remove the suspended solids, organic matter and harmful substances in the water through different treatment steps to meet the discharge standards. Among them, polyacrylamide plays a very important role. It can enhance the flocculation and sedimentation of particulate matter and improve the effect of wastewater treatment. This treatment process has the advantages of less investment, low operating cost, and good treatment effect. It is currently a commonly used coal-washing plant wastewater treatment process.
However, it is worth noting that long-term use of polyacrylamide may cause environmental problems. In addition, some manufacturers are over-marketing, resulting in the emergence of inferior polyacrylamide, which brings safety hazards to the environment and human health. Therefore, when using polyacrylamide, it is necessary to pay attention to selecting reliable products and following the correct use method.
