Municipal sewage
In the treatment of domestic sewage, polyacrylamide can promote the rapid agglutination and settlement of suspended turbidity particles to achieve the effect of separation and clarification through the electric neutralization and its own adsorption bridging. It is mainly used for flocculation settlement in the front section and sludge dewatering in the back section of sewage treatment plant.
Industrial waste water
When adding polyacrylamide to the water of suspended turbidity particles, it can promote the rapid aggregation and settlement of suspended turbidity particles through the electric neutralization and the adsorption bridging effect of polymer itself, and achieve the effect of separation and clarification, so as to improve the operating efficiency and reduce the operating cost.
Textile printing and dyeing industry
As a sizing agent and finishing agent for fabric post-treatment, polyacrylamide can produce a soft, wrinkle-proof and mildew resistant protective layer. With its strong hygroscopic property, it can reduce the breaking rate of yarn spinning. It also prevents static electricity and flame retardation of the fabric. When used as printing and dyeing auxiliaries, it can enhance the adhesion fastness and brightness of the product; It can also be used as non-silicon polymer stabilizer for bleaching. In addition, it can also be used for efficient purification of textile printing and dyeing wastewater.
Paper making industry
Polyacrylamide is widely used as retention aid, filter aid and dispersant in papermaking. Its function is to improve the quality of paper, improve the dehydration performance of slurry, improve the retention rate of fine fibers and fillers, reduce the consumption of raw materials and environmental pollution. The effect of its use in papermaking depends on its average molecular weight, ionic properties, ionic strength and the activity of other copolymers. Nonionic PAM is mainly used to improve the filter property of pulp, increase the strength of dry paper, improve the retention rate of fiber and filler; Anionic copolymer is mainly used as dry and wet strengthening agent and resident agent of paper. The cationic copolymer is mainly used for the treatment of papermaking wastewater and filtration aid, and it also has a good effect on improving the retention rate of the filler. In addition, PAM is also used in papermaking wastewater treatment and fiber recovery.
The coal industry
Coal washing wastewater, coal preparation plant slime water, coal power plant ground washing wastewater, etc., are a mixture of water and fine coal powder, its main characteristics are high turbidity, fine particle size of solid particles, the surface of solid particles are more negatively charged, the repulsive force between the same charge makes these particles remain dispersed in the water, affected by gravity and Brownian motion; Due to the interaction between the interface of solid particles in coal slime water, the properties of coal washing wastewater are quite complex, which not only has the properties of suspension, but also has the properties of colloidal. In order to make the coal slime water precipitate quickly in the concentrator, ensure the qualified washing water and pressure filter coal slime production, and make the production efficient and economical operation, it is necessary to select the appropriate flocculant to strengthen the treatment of coal slime water. The series of polymer flocculation dehydrating agent developed for coal slime dewatering in coal washing plant has high dewatering efficiency and is easy to use.
Electronic and electroplating industries
The common treatment process is to adjust the pH value of wastewater with sulfuric acid to 2 ~ 3 in the first reaction tank, then add reducing agent, adjust the pH value with NaOH or Ca(OH)2 to 7 ~ 8 in the next reaction tank to generate Cr(OH)3 precipitation, and then add coagulant to remove Cr(OH)3 precipitation.
Steel making plant
It is mainly used to purify the waste water from the flue gas of the oxygen blowing converter, which is usually called the dust removal waste water of the converter. The treatment of converter dust removal wastewater in steel mill should focus on the treatment of suspended solids, temperature balance and water quality stability. The coagulation and precipitation treatment of suspended matter need to remove the suspended impurities of large particles, and then enter the sedimentation tank. Add PH regulator and polyacrylamide in the open ditch of the sedimentation tank to achieve the common flocculation and sedimentation of suspended matter and scale in the sedimentation tank, and then add scale inhibitor to the effluent of the sedimentation tank. In this way, it not only solves the problem of wastewater clarification, but also solves the problem of water stability, so as to achieve a better treatment effect. PAC is added into the sewage, and the polymer flocculates the suspended matter in the water into small floc. When the sewage added polyacrylamide PAM, through a variety of bond cooperation, so that it becomes a strong binding force of larger floc, so that it precipitation. According to the practice, the combination of PAC and PAM has better effect.
Chemical plant
The high chrominance and pollutant content of wastewater are mainly caused by incomplete raw material reaction or a large amount of solvent medium used in production entering the wastewater system. There are many biodegradable substances, poor biodegradability, many toxic and harmful substances, and complex water quality components. The reaction raw materials are often solvent substances or compounds with ring structure, which increase the difficulty of wastewater treatment. Choosing suitable polyacrylamide type can achieve better treatment effect.
Cigarette factory
In the back of the sludge dehydration, the selection of polyacrylamide flocculant is difficult, the range of water quality change is relatively large, technical personnel should pay attention to the change of water quality and do the relevant sludge dehydrating agent test selection, the workload is also relatively large, the general selection of cationic polyacrylamide, molecular weight requirements are relatively high, if the drug reaction speed is fast, the applicability will be better than the requirements of equipment.
Brewery
The treatment is generally adopted aerobic treatment technology, such as activated sludge method, high load biological filtration method and contact oxidation method. From the current case, it can be learned that the flocculant used by the general brewery generally uses strong cationic polyacrylamide, the molecular weight requirement is more than 9 million, the effect is more prominent, the dosage is relatively less, the cost is relatively low, and the water content of the mud cake pressed by the filter is also relatively low.
Pharmaceutical manufacturing plant
The treatment methods are generally as follows: physical and chemical treatment, chemical treatment, biochemical treatment and the combination of various methods, etc. Each treatment method has its own advantages and disadvantages. At present, a water quality treatment method is widely used in the process of pharmaceutical wastewater pretreatment and post-treatment, such as aluminum sulfate and polyferric sulfate used in traditional Chinese medicine wastewater, etc. The key of efficient coagulation treatment lies in the proper selection and addition of excellent coagulants.
Food factory
The traditional method is physical settlement and biochemical fermentation, in the biochemical treatment process to use polymer flocculant, do sludge dewatering treatment. The polymer flocculants used in this section are generally cationic polyacrylamide products with relatively high ionic degree and molecular weight.
Post time: Nov-16-2022