The sludge of municipal sewage treatment plants is a kind of pathogenic microorganisms, a variety of organic and inorganic pollutants and heavy metals. Solid-liquid mixture with foul odor. It is mainly composed of hydrophilic and negatively charged colloidal particles. The particles are small, the range of particle size distribution is large, the binding force with water is very strong, the specific resistance and viscosity during filtration are large, and it is not easy to realize the separation of mud and water.
Sludge treatment is the process of reducing, stabilizing and harmless treatment of sludge. The higher the degree of sewage treatment, the more sludge residues that need to be treated. Unless the land is used to treat sewage or sewage ponds, ordinary sewage treatment plants must be equipped with sludge treatment facilities. For modern sewage treatment plants, the treatment and disposal of sludge has become a complicated and expensive part of the operation of sewage treatment systems.
The traditional single use of inorganic cationic flocculants for sludge dewatering is far from reaching the requirements of the Ministry of Environmental Protection, so deep dewatering of sludge is imperative. At the same time, the prospect of cationic flocculant PDA is a linear long molecular chain polymer, due to its high density of positive charge, high water solubility, and high intrinsic viscosity. And there is a unique charge neutralization and adsorption bridging effect. It is a new, fine, multifunctional polymer. Compared with other cationic polyacrylamide flocculants. It has the advantages of stable cationic unit structure, high efficiency and non-toxicity, and is not affected by pH, so it has a wide range of applications in petroleum exploration, papermaking, and sludge treatment. Common synthetic methods include inverse emulsion method and aqueous solution method. The aqueous solution polymerization method has the characteristics of low process requirements, low raw material prices, safe operation, and solvent-free recovery. It is suitable for large-scale industrial production. It is a commonly used method in industrial production. Research on the synthesis of PDA by aqueous solution and the use of synthetic PDA After inorganic conditioning, the sludge is deeply dewatered. Save a lot of social energy. Reduce environmental pollution.
Poly(DMDAAC/AM) Series Property
PDA gathers electrolyte for the strong cation, appearance is clear to light yellow viscose liquid, specific weight:1.02g/cm3,resolve temperature:302℉.BE dissolved in water easily, not easy to combust. This series of polymer is the highly charged cationic copolymer of dially dimethyl ammonium chloride and acrylamide, cationic, high polymer weight, has the characteristics of electron neutralization and bridge absorbtion.