Polyaluminum chloride on the pH value of the flocculation and coagulation analysis Degree of impact of the PAC on the pH value of flocculation and coagulation impact Analysis of the polymer coagulant dissolved in water will produce hydrolysis and polycondensation reaction to form a high polymer . This high polymer structure is a linear structure with one colloidal particle pulled at one end and another colloidal particle pulled at the other end, which acts as a bridging bridge between two distant particles, Particles gradually become larger, into a large particle flocs (commonly known as alum flower). therefore. This polymer as a result of adsorption and bridging the particles to each other bonding process, called flocculation. In other words, flocculation is the addition of a high-molecular-weight flocculant in water to help the colloidal particles that have been neutralized to further agglomerate, allowing them to coagulate faster into larger flocs, accelerating precipitation. Aggregation of the colloidal particles through the electric double layer bonding process and the flocculation of the colloidal particles to each other through the bridging action of the adsorption of the polymer material are collectively referred to as coagulation. The so-called coagulation process, refers to the water treatment process, add to the water polyaluminium chloride pharmaceutical, water and pharmaceutical mixing, so that the colloidal substances in water condensation and flocculation, the synthesis process is called coagulation process. Coagulation: After adding agents in water, it produces ionization and hydrolysis, forming colloids, and other colloidal particles in the water adsorption, making it flocculation into large particles, the final settlement and other water treatment process known as Coagulation treatment. The impact of water pH on flocculation and coagulation, depending on the species of coagulant. With aluminum sulfate to remove turbidity in water, the optimal pH range is between 6.5 and 7.5; for color removal, the pH is between 4.5 and 5. With ferric salts, the optimum pH range is 6.0-8.4, wider than aluminum sulphate. With flow rate ferrous iron, Fe3 + is rapidly formed only if there is enough dissolved oxygen at pH 8.5 and water, which complicates the equipment and operation. To this end, often using chlorine oxidation method, the reaction is: 6FeSO4 +3Cl2 = 2Fe2 (SO4) 3 +2 FeCl3 polymer coagulants, especially organic polymer coagulant, coagulation effect by the pH value of more small. It can be seen from the hydrolysis reaction of aluminum salts and iron salts that the continuously generated H ions in the hydrolysis process will certainly lower the pH value of the water. To keep the pH within the optimum range, alkaline substances should be neutralized. When the alkalinity in the raw water is sufficient, the pH drops slightly without affecting the coagulation effect. When the original water alkalinity or coagulant dosage is large, the water pH will drop significantly, affecting the coagulation effect. In addition, lime or sodium bicarbonate should be added. The dosing polymer coagulant, the water pH drop smaller, even if the dosage is larger, the pH drop is not large, generally do not need to add alkali adjustment. This information is purified by the filter source from http://www.gyzhenyu.com/ finishing release, for transfer, please specify the way to the address!