Magnesium Sulfate Heptahydrate Is Used For Water Treatment In Printing And Dyeing Industry With Remarkable Effect.

Printing and dyeing wastewater is a kind of industrial wastewater which is harmful to the environment. It is difficult to treat the wastewater because of its large discharge, high chroma and difficult degradation of organic matter. It is difficult to reach the standard by using conventional treatment methods. Therefore, it is necessary to find a simple and inexpensive effective decolorization method for printing and dyeing wastewater - magnesium salt method. The decolorization principle of_-magnesium salt method is magnesium salt, that is, magnesium sulfate, which is hydrolyzed by alkali to form magnesium hydroxide precipitation with positive charge. It strongly adsorbs anionic dyes with negative charge and decolorizes dye wastewater. Magnesium sulfate is used to treat acid dye wastewater with good effect and high chroma after treatment. Magnesium salt method can effectively remove water-soluble acid dyes. Under suitable conditions, the decolorization rate is very high. To sum up, the treatment of printing and dyeing wastewater with magnesium sulfate saves costs to a certain extent and reduces secondary pollution. This method is worth popularizing, but also does not pollute water and is harmless to human body.