occulant in the wastewater treatment industry. There are anions, cations and nonions. Of course, the treatment of food waste water is not exceptional. The use of PAM mainly consists of a certain amount of polar genes in the molecular chain that can adsorb solid particles suspended in water, bridge the particles to form large flocs, and accelerate the effects of rapid flocculation, sedimentation and clarification of wastewater.
Food waste water treatment, people who have been exposed to this industry's waste water treatment should understand that the waste water contains COD, BOD, SS and fat content are relatively high, belongs to high-concentration organic waste water, great harm to water bodies and environmental pollution. For the treatment of this kind of wastewater with high organic concentration, physical precipitation method is generally used. The polymer flocculant polyacrylamide is used in the treatment process. There are many types of products, and the type selection needs special attention. Polyacrylamide for food wastewater should pay attention to:
1. Temperature change affects the selection of flocculant;
2. Select the molecular weight of the flocculant according to the size of the flocs required by the treatment process;
3. The charge value of the flocculant must be screened through experiments;
4. The strength of the floes can be increased by increasing the molecular weight of the flocculant.
5. The flocculant and sludge must be fully mixed and dissolved before treatment.
6. The choice of flocculant must fully consider the requirements of process and equipment.
Wastewater treatment is very important for the selection of polyacrylamide, but it must also be selected in combination with the characteristics of on-site process equipment and wastewater. It is not the result of poor treatment effects that is the cause of the product. Sometimes it may be due to changes in water quality and inconsistent processes, which need to be replaced. Product number
Through the flocculation and coagulation of polyacrylamide, double ionization compaction occurs in the mud treated with clean water, which reduces the stability of particle collection and combines the particles with simple anions under the action of molecular gravity. The concentration of the dispersed phase can be polymerized. Substituted by anions; the chemical interaction between the polyacrylamide polymer and natural water substances, water suspensions or previously added hydrolyzed coagulant ions may be a complex reverberation; due to the molecular chain of polyacrylamide is fixed on different particles On the surface, each solid particle forms a fusion bridge. Filter material polyacrylamide is used to treat oily wastewater. Oily wastewater mainly comes from industrial sectors such as petroleum, petrochemical, steel, coking, natural gas power plants, and machinery processing. Except for the relative density of heavy tar, the oily substances in the wastewater are above 1.1, and the other relative densities are below 1.1. Oily substances are usually present in wastewater in three states. The main research results are as follows: (1) The oil droplet size is greater than 10.
Only when the dose exceeds 5000 ppm, the absorption of nutrients to the gastrointestinal mucosa of animals is harmful. The monomeric acrylamide (AM) remaining in the PAM is toxic. For oilfield use and urban sewage treatment, the residual monomer is generally allowed to be around 1%. For food, such as drinking sucrose juice, the manufacturing may be related to the food. The amount of residual monomers, such as paper contact, must be strictly controlled, generally less than 0.05%. The residual monomer content of polyacrylamide in food in my country is also less than 0.5%. The correct selection of the cationic polyacrylamide ion degree shows that the amount of polyacrylamide used for coal washing can be set between 30 kg and 110 kg; the amount of wastewater used in the chemical industry is generally 50 Between 120 kg; wastewater from the bleaching and dyeing industry and wastewater from the paper industry are difficult to treat. The amount of use should be increased, and it is reasonable to set the amount of use between one hundred and three hundred kilograms. The electroplating wastewater industry and ordinary industrial water should generally not exceed five.
Thereby affecting the use of Polyacrylamide for food wastewater. There are many elements that are not ideal. Therefore, the following is a description of the circumstances under which this product will be affected. Cationic polyacrylamide is more suitable before the primary treatment of the structure. When the content of suspended matter is less, it is more appropriate to add cationic polyacrylamide before the filter. In order to enable the suspended matter to form fine flocs in time, no actual reduction in particle concentration and deterioration of the surface properties of the coagulant suspension occur. The time interval between adding coagulant and flocculant is generally between 1 and 4 minutes. The lower the temperature and turbidity of the cationic polyacrylamide water, the higher the color of the water. The longer the time interval between the coagulant and flocculant, the addition of PAM before chlorination can reduce the degree of disinfection of the water, thereby making the cation high The process performance of molecular flocculants deteriorates because pre-chlorination will cause the cationic polyacrylamide polymer to shield the disinfection process of biological objects. The polymer is destroyed by the action of the oxidant. The application of cationic polyacrylamide in industrial production is a high cost.