Polyacrylamide is a commonly used water treatment agent for sludge dewatering. Its function is mainly to use the positive charge attached to the molecular chain of PAM to neutralize the negative charge in the sludge colloidal particles, accelerate the coagulation of sludge, and use its molecular weight. The sludge particles are entangled together to squeeze out the water in it to achieve the purpose of sludge dewatering.
Polyacrylamide for sludge dewatering
Cationic polyacrylamide for sludge dewatering. Polyacrylamide can be divided into four series: anionic, cationic, nonionic and zwitterionic. According to the ion density, CPAM can be divided into weak cationic and medium There are three types of cationic and high cationic polyacrylamide. The higher the ion density, the stronger the neutralizing negative charge to destabilize the sludge colloidal particles, but the high ion density cationic polyacrylamide tends to have a smaller molecular weight. The bridge capacity is weak.
However, sludge dewatering does not mean that the higher the ion degree, the better the use effect. Capitel Chemicals recommends that when users need to use cationic polyacrylamide for sludge dewatering, they should first conduct a small experiment and then a large-scale test on the machine to determine which type of cationic polyacrylamide with ionicity is more suitable. On the one hand, it can reduce the cost of use, and on the other hand, it can enhance the use effect. Solid granular or dry powder polyacrylamide products need to be weighed before use, and then need to add water in a stirred tank and then add it to dissolve before use.
The use of cationic polyacrylamide for sludge dewatering can be divided into natural drying dewatering and mechanical dewatering.
Natural drying and dewatering refers to placing the sludge in the drying square to achieve dewatering through evaporation, permeation and overflow of clear liquid. This method is prone to foul smell and disease.
Mechanical dewatering is currently the main method of sludge dewatering in my country. Filter presses and other equipment are mainly used to dewater the sludge, during which cationic polyacrylamide water treatment agents are used to speed up the dehydration efficiency.
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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.