Polyaluminum chloride for the dye wastewater decolorization of wastewater enough to meet the national emission standards Filter water purification materials manufacturers, manufacturers a large number of long-term direct marketing: the various grades of PAC PAC: 26%, 27%, 28%, 30% save the middle Links to the national distributors and users to provide first-hand ex-factory price, long-term cooperation of large concessions! In recent years, people research more organic flocculants, especially synthetic high molecular flocculant, it has a wide range, with excellent performance, but due to the price, the number of residual monomers in the synthesis of the restrictions, So that it is restricted in application. Therefore, developing a new organic flocculant which is cheap, non-toxic and highly efficient has become one of the main research directions of flocculation. In addition, organic flocculants can be used in combination with inorganic flocculants to fully exert the adsorptive bridging property of organic macromolecule flocculants and the electric neutralization ability of inorganic flocculants so as to ensure the high efficiency of review flocculants Sex, so that the water to achieve better results. In addition, a single flocculation technology is often ineffective for printing and dyeing wastewater treatment, so according to the actual effluent requirements, should also pay attention to the use of appropriate pretreatment and post-treatment means to play the advantages of collaborative work flocculation and other processes in order to achieve comprehensive management The purpose, which is to improve the treatment effect of printing and dyeing wastewater, reduce processing costs is extremely important. Textile color printing industry to exclude the color of the waste water are generally high, the general emphasis on water treatment is decolorization effect, how can play a decolorizing effect, the dye wastewater to meet national emission standards, so that it will not pollute the environment, PAC PAC To explain the use of polyaluminum chloride on the dye wastewater decolorization effect. Biological treatment of printing and dyeing wastewater chrominance removal generally only 50% 60%; and physical and chemical methods coagulation sedimentation can reach 50% 90% 90%, the general direct dyes, vat dyes, sulfur dyes, disperse dyes and colloidal substances are Better removal efficiency, the chroma removal rate of up to 80% 90%, COD removal rate of up to 50% 80%, but the acid dyes, reactive dyes, metal complex dyes and cationic fuels, the decolorization effect is poor, Generally only 50% 60%. At present, polyaluminum chloride (PAC) is generally used as a coagulant, and polyaluminum chloride has a good decoloring effect on dye wastewater. When the dosage is 0.05%, the decolorization effect of the five types of dyes is good. Polyaluminum chloride in wastewater suspended in the state of the dye, vat dyes better decolorization, sulfur dyes, nafto dye followed, the water-soluble reactive dye bleaching less effective. In addition to increase the dosage of PAC, can improve the decolorization effect. For example, for printing and dyeing wastewater containing sulfurized dyes and nafost dyes, when the polyaluminium chloride dosage increases to 0.08% and 0.1%, the decolorization efficiency will be increased to 81% and 90% respectively, but the processing cost also corresponds to increase.