聚丙烯酰胺在餐饮废水中起到的重大作用（Polyacrylamide plays an important role in restaurant wastewater）.doc

聚丙烯酰胺在餐饮废水中起到的重大作用（Polyacrylamide plays an important role in restaurant wastewater） Polyacrylamide plays an important role in restaurant wastewater: The key to the treatment of restaurant wastewater lies in degreasing and environmental protection. Flocculation and demulsification of restaurant wastewater are carried out by polyacrylamide flocculation. Suspended impurities of restaurant wastewater is divided into polymer and lipid derivatives based oils and vegetable granules, insoluble protein, insoluble fiber state organic matter two. The wastewater is mainly oil, which leads to higher CODcr value of water. Therefore, the key to the treatment of restaurant waste water is to remove oil. Therefore, flocculation and demulsification are used to treat restaurant wastewater. 1. Flocculation principle Pollutants in restaurant wastewater mainly exist in colloidal form. The colloid itself has huge surface free energy, has great adsorption capacity, but also has the characteristics of Brownian motion, and thus have more chances of collision between particles, seems to be sticking synthesis of large particles agglomeration, and then settle down due to gravity action. But because the charge colloidal particles with similar isotropic, the electrostatic repulsion between them to prevent particles close to each other and poly synthesis of larger particles; secondly, water molecules and counterions and charged colloidal particles surrounding in the hydration, forming a layer of hydration shell, the particles also hinder the polymerization. Adding aluminum salt and other inorganic salt, the hydrolysis of metal ions and the polymerization process, polynuclear complex ion adsorbed with positive charge can be compressed electric double layer, reduce the potential between colloidal particles can reduce the maximum rejection, so that the particles destabilization. The use of inorganic salt flocculants at the same time, organic polymers are often used as flocculant. The polymer flocculan