Gongyi Filter Industry Co., Ltd.

Application of Polyaluminum Chloride in Wastewater Treatment in Textile Dyeing and Finishing Industr

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2017-12-19 09:22:02

Polyaluminium chloride in the textile dyeing and finishing industry wastewater treatment applications Textile printing and dyeing industry is one of China's major industries, however, behind the colorful, but it caused serious pollution of the water environment, textile printing and dyeing industry waste water emissions are chroma High, how to decolorize has also become a business headache problem. In general, textile printing and dyeing wastewater has the following characteristics: most of the organic wastewater is benzene, naphthalene, anthracene, quinone and other aromatic groups as the parent, and with a chromophore, deep color, color 500 ~ 500000, Due to the needs of the production process and molecular structure, dye materials and intermediate molecules often contain polar groups, which increase the water solubility and make the material loss large. Wastewater usually contains many raw materials and by-products, such as halides, nitro compounds, amino compounds, aniline, phenols and other organic compounds and sodium chloride, sodium sulfate, sulfides and some inorganic salts, high concentrations, Up to 1000 ~ 73000mg / L; Dye wastewater mostly acidic, and some were alkaline, the general salt content is large. For textile printing and dyeing wastewater is difficult to decolorize, difficult to deal with the characteristics of the current market generally adopt the treatment method is: polyaluminum chloride or polyaluminium chloride, polyaluminium sulfate while polyacrylamide to achieve the desired effect. The effect of these agents on the treatment of dye wastewater solution is higher than that of the individual components. In the case of a certain ratio, the influence of raw water pH and dosage on the decolorization rate is greater, and other factors have little effect on the decolorization rate. In the best conditions decolorization rate of up to 99.7%. The polyaluminum chloride on the dye wastewater high decolorization efficiency, good floc settlement properties, suitable for alkaline dye wastewater pretreatment. Polyaluminum chloride (PAC) is a widely used inorganic flocculant, but its use in large quantities, if the polyacrylamide and polyaluminum chloride synergies, will greatly reduce the dosage of PAC. And can achieve good treatment effect, low cost and so on.