About pulping wastewater treatment mechanism using Poly aluminum chloride coagulation mechanism Pulping wastewater treatment using poly aluminum chloride coagulation mechanism to make colloidal particle destabilization generally use two methods: First, improve the kinetic energy of the colloidal particles, The kinetic energy of the Brownian motion of the micelles is only related to the temperature. But the temperature increased by 10 degrees. Kinetic energy can only be raised to about 4%, little effect, but no practical value in water treatment; the second is to reduce repulsion. The repulsive energy peak depends on the difference between the repulsive potential energy and the attractive potential energy. Since the gravitational force is hard to change, the attractive potential energy can not be easily changed. The electrostatic repulsion is related to the charge of the micelles. When the charge decreases, Intergranular repulsion becomes smaller, repulsion energy peak also lower limit, so that the rubber particles may rely on kinetic energy to pass the repulsion energy peak, further close, and finally together. Electrolyte-coagulants are added to the pulping wastewater treatment, generally trivalent polyaluminum chloride or polyaluminum chloride, polymerized ferric sulfate. Electrolytes dissociate out of the metal ions into the plastic release diffusion ion layer, and even into the fixed ion layer, ion replacement, so that the double layer thinning, that is compressed, the potential decline, leaving the colloid loss of stability between the intergranular Mutual paste agglomeration, usually called this - the process of condensation. Colloid song on the opposite sex, heterosexual colloidal particles or linear polymer with a site of heterosexual adsorption has a strong role in the next role in neutralizing some of its charge, reducing the electrostatic repulsion between the colloidal particles. Aggregate the particles. This is the electrostatic attraction between heterosexual charges plays a major role. In some cases, however, it is also possible that a small charged particle is adsorbed by another large particle surface with an opposite charge. This is the role of the intermolecular forces on the surface of the colloids. Based on the above mentioned neutralization of adsorbed electricity, it can be explained that in the production practice, the amount of polyaluminum chloride added in the coagulant is too large, and why the phenomenon of re-stabilization of colloidal particles or charge denaturation often occurs. Two large homosexual charge particles between the towel by a heterosexual charged particles linked together, generally known as bridging role; Polymer parts of the molecular chain on the interaction between some sites and the particles, so that a polymer Two or more micelles can be adsorbed on the chain. This is also known as the role of coalescing Jiao Jiao effect, the role of the polymer by the adsorption of rubber particles coalescence process called flocculation, the above-mentioned coagulation and flocculation collectively referred to as coagulation. When a metal salt (such as polyaluminum chloride or polyaluminum chloride, polymerized iron sulfate) or a metal oxide or hydroxide is used as a coagulant, under certain conditions, a rapidly precipitating metal hydroxide or Metallic carbonates cause the micelles in the water to be adsorbed and entrained by these sediments. Settled from the pulping wastewater, this is the netting mechanism in the coagulation process. When the sediment is positively charged under neutral or acidic conditions, the settling velocity can be accelerated by the presence of anions in the pulping wastewater. The colloidal stability and colloidal cohesion mechanisms described above are all directed at hydrocolloids with an electric double layer structure. Hydrophilic colloids, on the other hand, have a water shell formed by hydration. The thickness of the shell is the key factor that determines the total stability. The key to condensing hydrophilic colloids is to compress the phase to remove the bound water shell. In general, the electrolyte is added, and the electric charge brought by the rubber particles is neutralized first, so that the electric potential is decreased. Followed by dehydration, due to dissociation of electrolyte ions have a great hydration ability. Will keep the particles around the water molecules, and remove the water shell, which undermined the role of solvation, the rubber particles aggregate.