Several situations of sludge classification in water treatment industry, Flocculant for sludge dewatering,
Sludge is a problem that often appears in the water treatment industry and requires a solution. The most commonly used polyacrylamide flocculant product in sewage desludge is the product of polyacrylamide flocculant. Today I will share with you several situations about sludge classification. Flocculant for sludge dewatering,
Several situations of sludge classified by source:
The first type: physicochemical sludge discharged from the sedimentation tank or thickening tank of a water plant;
The second type: the remaining activated sludge discharged from the secondary settling tank of the domestic sewage plant;
The third type: physicochemical and biochemical mixed sludge discharged from the thickening tank produced by industrial wastewater treatment, such as paper mills, printing and dyeing plants, washing cloth plants, petrochemical plants, organic chemical plants, meat plants, breweries, etc.;
The fourth type: physical and chemical fine-grained sludge produced by the physical and chemical methods discharged from the thickening tank produced by industrial wastewater treatment, such as electroplating plants, circuit board plants, etc.;
The fifth type: physicochemical sedimentation of medium-size sludge produced by industrial wastewater treatment, such as salt sludge from alkali plant, desulfurization and dust removal sludge from iron and steel plant, aluminum plant red mud, color tube plant sludge, ceramic plant sludge, lime neutralization sedimentation Sludge etc.;
The sixth type: physicochemical precipitation of coarse-grained sludge produced by industrial wastewater treatment: such as coal washing plant tailings, glass factory quartz slag, etc.;
Classification according to mechanism performance and processing speed:
A. Hydrophilic, fine-grained organic sludge has poor compressibility and dewatering performance. As the second above
B. Medium and fine-grained organic and inorganic mixed sludge, with general compressibility and dewatering performance. As the first above
C. Medium and fine-grained mixed sludge has good dewatering performance with fibrous body, and the other compressibility and dewatering performance are average. As the third above
D. Fine-grained inorganic sludge, general compressibility and dewatering performance. As the fourth above
E. Medium-size hydrophobic inorganic sludge has good compressibility and dewatering performance. As the fifth above
F. Coarse-grained hydrophobic inorganic sludge has good compressibility and dewatering performance. As the sixth above
Industrial waste water includes production waste water and production sewage, which refers to waste water and waste liquid generated in the industrial production process, which contains industrial production materials, intermediate products, by-products and pollutants generated in the production process with the loss of water. Water discharged during production. Industrial wastewater treatment polyacrylamide PAM is used as an flocculation agent for wastewater treatment, which is an important aspect of water treatment.
Polyacrylamide products are mainly used as coagulant or flocculant in the treatment of industrial wastewater. Because its molecular chain contains a certain amount of polar genes, it can adsorb solid particles suspended in water, so that bridges between the particles form large flocs. It can accelerate the sedimentation of particles in suspension, and has obvious effects of accelerating the clarification of solution and promoting filtration. It is widely used in the treatment of wastewater and waste liquid in chemical industry.
Generally, the first stage treatment of sewage (air floatation or sedimentation) is combined with inorganic flocculant (polyaluminum chloride PAC) and organic polymer flocculant (polyacrylamide PAM), while the latter stage treatment is sludge dehydration, using organic polymer Flocculant (cationic polyacrylamide) is used as sludge dewatering agent. Anion polyacrylamide is also selected for the dewatering of individual sewage sludge. This should be further determined according to the actual situation of each plant.
In short, the application of Industrial wastewater treatment polyacrylamide in the water treatment industry mainly includes raw water treatment, sewage treatment and industrial water treatment. In raw water treatment, polyacrylamide is used in conjunction with activated carbon, etc. It can be used for the aggregation and clarification of suspended particles in domestic water; in sewage treatment. Polyacrylamide can be used for sludge dewatering; in industrial water treatment, polyacrylamide is mainly used as a formulation agent. In the raw water treatment, the organic flocculant polyacrylamide is used to replace the inorganic flocculant. Even if the sedimentation tank is not modified, the water purification capacity can be increased by more than 20%.
Therefore, many large and medium-sized cities currently use polyacrylamide as a supplement when the water supply is tight or the water quality is poor. Industrial wastewater treatment, especially for suspended particles, coarser, high concentration, particles with positive charge, PH value of water is neutral or alkaline sewage, steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, coal washing wastewater and other wastewater treatment , The effect is recommended. In sewage treatment, the use of polyacrylamide can increase the utilization rate of water recycling.