Application of highly efficient cationic polyacrylamide in the sludge dewatering process - CHINAFLOC
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Application of highly efficient cationic polyacrylamide in the sludge dewatering process
2016-07-16 13:00:26
    Cationic polyacrylamide is mainly used for papermaking industry, three oil, water treatment, solid-liquid separation, sludge dewatering and system thickening, with the development of polymerization technology, cationic polyacrylamide has from the initial powder (colloidal) become dry now. Cationic polyacrylamide is the fastest growing variety in the past few years, the annual growth rate of 5%-10% in the western developed countries, has accounted for more than 60% of the total production of polyacrylamide. China's situation is special, anionic polyacrylamide accounted for more than 90% of total production, mainly for oil exploitation, cationic polyacrylamide production is very small and the scale of production is also very small, almost no large-scale production of large-scale. With the rapid development of environmental protection industry, the rapid development of environmental protection, water treatment industry has been rapid development, rapid growth of the demand for cationic polyacrylamide, and the technical requirements of the industrial products such as waste water treatment and functional paper additives, believe that the country will have a greater development of cationic polyacrylamide in recent years.  
 
    Cationic polyacrylamide mainly comprises of the following three types: low molecular weight poly amine, acrylamide and cationic monomers and nonionic polyacrylamide modified. Polyamines including polyethyleneimine polyethylene imidazole and amine surface chlorohydrin condensates and improve product, this kind of product is charge density high, but molecular weight low, mainly for the function of papermaking additives, oil and cosmetics industry, it is rarely used for sludge dewatering. Acrylamide and cationic monomer copolymerization cationic polymer production is the largest, cationic monomer mainly refers to (DMC) and two 0-100% (DMDAC), P (AM-DMC) product molecular weight is higher, cationic polyacrylamide almost all belong to this kind of structure, our country is used for sludge dewatering of powdered cationic polyacrylamide also belong to this kind of product molecular weight 30%-50%, the main problem is that DMC need to import, expensive, resulting in higher production costs. For P (AM-DMDAC), due to the DMDAC monomer steric hindrance of the larger, the polymerization activity and it was very difficult for preparing molecular weight and cationic degree of satisfactory products, so for sludge dewatering, and DMDAC highly absorbent, this kind of product usually for liquid. Non ionic polyacrylamide amide radicals with a variety of reagents, which reacts with formaldehyde and dimethylamine can be the formation of tertiary amine polymer structure further season generate amine quaternary ammonium salt. Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.
 
    Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.
 
    Flocculation is through the organic polymer flocculant on suspension (or colloidal) fine particles in charge neutralization and adsorption bridging the steady removal, organic polymer flocculant must has high molecular weight and linear structure and moderate charge density, its molecular structure and ionic form, intensity and distribution, molecular weight and molecular weight distribution and branching degree will influence the flocculation effect, in view of the characteristics of a given suspension synthesize the exact structure of flocculant, flocculant product formed a series. Treatment of municipal wastewater treatment plant sludge dewatering and quenching and tempering treatment is an important aspect of the application of organic polymer flocculant, sludge is divided into raw sludge (sludge and excess sludge) and digested sludge, according to the type of sludge and the nature of the choice of organic polymer flocculant. Sludge VSS / SS (SS organic matter ratio) higher should try to choose a high degree of cationic flocculant, and increase the dosage of flocculant; sludge SS concentration is high, should choose high molecular weight flocculant. The SS concentration is low, selection of low molecular weight flocculants; sludge pH is high (digested sludge) should be selected functional groups for the structure of quaternary ammonium salt flocculant, pH is low, the structure of tertiary amine and quaternary ammonium salt flocculant can be used.
 
    Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.
 
    Water treatment product is an important part in the process of sludge dewatering, and it can get twice the result with half the effort. But the development of water treatment products industry in China started late. Product development and improvement is an important part of the process of energy saving and efficiency optimization of sludge dewatering process. Dongying Nuoer chemical limited liability company in the domestic market products molecular weight low, cationic interval small as the research subject, on its own R & D production of high molecular weight cationic polyacrylamide and molecular weight reached more than 12 million and cationic degree is 5% - 80%, and in the chain structure has been adjusted, with the domestic similar products compared with dissolved quickly, strong floc, shear, on the tiny fiber and small particles flapping catch is strong wait for an advantage, technology has reached the domestic production of polymer industry leading level, can completely substitute the foreign advanced products, high performance to price ratio
Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.    Cationic polyacrylamide mainly comprises of the following three types: low molecular weight poly amine, acrylamide and cationic monomers and nonionic polyacrylamide modified. Polyamines including polyethyleneimine polyethylene imidazole and amine surface chlorohydrin condensates and improve product, this kind of product is charge density high, but molecular weight low, mainly for the function of papermaking additives, oil and cosmetics industry, it is rarely used for sludge dewatering. Acrylamide and cationic monomer copolymerization cationic polymer production is the largest, cationic monomer mainly refers to (DMC) and two 0-100% (DMDAC), P (AM-DMC) product molecular weight is higher, cationic polyacrylamide almost all belong to this kind of structure, our country is used for sludge dewatering of powdered cationic polyacrylamide also belong to this kind of product molecular weight 30%-50%, the main problem is that DMC need to import, expensive, resulting in higher production costs. For P (AM-DMDAC), due to the DMDAC monomer steric hindrance of the larger, the polymerization activity and it was very difficult for preparing molecular weight and cationic degree of satisfactory products, so for sludge dewatering, and DMDAC highly absorbent, this kind of product usually for liquid. Non ionic polyacrylamide amide radicals with a variety of reagents, which reacts with formaldehyde and dimethylamine can be the formation of tertiary amine polymer structure further season generate amine quaternary ammonium salt. Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.
    Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.
    Flocculation is through the organic polymer flocculant on suspension (or colloidal) fine particles in charge neutralization and adsorption bridging the steady removal, organic polymer flocculant must has high molecular weight and linear structure and moderate charge density, its molecular structure and ionic form, intensity and distribution, molecular weight and molecular weight distribution and branching degree will influence the flocculation effect, in view of the characteristics of a given suspension synthesize the exact structure of flocculant, flocculant product formed a series. Treatment of municipal wastewater treatment plant sludge dewatering and quenching and tempering treatment is an important aspect of the application of organic polymer flocculant, sludge is divided into raw sludge (sludge and excess sludge) and digested sludge, according to the type of sludge and the nature of the choice of organic polymer flocculant. Sludge VSS / SS (SS organic matter ratio) higher should try to choose a high degree of cationic flocculant, and increase the dosage of flocculant; sludge SS concentration is high, should choose high molecular weight flocculant. The SS concentration is low, selection of low molecular weight flocculants; sludge pH is high (digested sludge) should be selected functional groups for the structure of quaternary ammonium salt flocculant, pH is low, the structure of tertiary amine and quaternary ammonium salt flocculant can be used.
    Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.
    Water treatment product is an important part in the process of sludge dewatering, and it can get twice the result with half the effort. But the development of water treatment products industry in China started late. Product development and improvement is an important part of the process of energy saving and efficiency optimization of sludge dewatering process. Dongying Nuoer chemical limited liability company in the domestic market products molecular weight low, cationic interval small as the research subject, on its own R & D production of high molecular weight cationic polyacrylamide and molecular weight reached more than 12 million and cationic degree is 5% - 80%, and in the chain structure has been adjusted, with the domestic similar products compared with dissolved quickly, strong floc, shear, on the tiny fiber and small particles flapping catch is strong wait for an advantage, technology has reached the domestic production of polymer industry leading level, can completely substitute the foreign advanced products, high performance to price ratio
Because the viscosity of polyacrylamide aqueous solution is very large, usually 600-800 million molecular weight of 2% concentration has been very sticky, which brings difficulty to the water solution reaction, because the concentration of PAM is very low, resulting in the cationic degree is usually not more than 10% and the residual formaldehyde concentration is higher. For the sewage treatment plant in the sewage treatment plant at the county level of organic matter, the low cost of non - ionic polyacrylamide Mannich denaturing products are applicable.