Printing and dyeing industrial water, usually every printing and dyeing processing 1 ton of textile water consumption of 100-200 tons, of which 80% -90% of printing and dyeing wastewater discharge. Governance recycling and safe disposal.
Recycling:
(1) waste water according to water quality characteristics, respectively, recycling, diversion such as bleach scouring wastewater and dyeing and printing wastewater, former convection wash, a water use, reduce emissions
(2) lye recycling, usually using the evaporation method recovery, such as the large amount of lye, the available three-effect evaporation recovery, a small amount of lye available thin-film evaporation recovery (3) dye recovery, such as soil forest dyes acidification into the hidden bar acid was colloidal particles suspended in the residue, the precipitate filtered recyclable.
Sound processing can be divided into:
(1) physical treatment methods of precipitation and adsorption. Precipitation method is to remove suspended solids in the wastewater; adsorption removal of dissolved pollutants in the wastewater and decolorization.
(2) chemical treatment in France, coagulation and oxidation. And the method is to adjust the pH of the wastewater, but also to reduce the chroma in wastewater; coagulation method is the removal of disperse dyes and colloidal substances in the wastewater; oxidation is the oxidation of waste water reducing substances, sulfur dyes and vat dyes precipitate off.
(3) biological treatment, activated sludge, rotating biological contactors, biological drum and biological contact oxidation method. In order to improve water quality, to meet emission standards or recovery requirements, and often requires several approaches to joint treatment.
Recycling:
(1) waste water according to water quality characteristics, respectively, recycling, diversion such as bleach scouring wastewater and dyeing and printing wastewater, former convection wash, a water use, reduce emissions
(2) lye recycling, usually using the evaporation method recovery, such as the large amount of lye, the available three-effect evaporation recovery, a small amount of lye available thin-film evaporation recovery (3) dye recovery, such as soil forest dyes acidification into the hidden bar acid was colloidal particles suspended in the residue, the precipitate filtered recyclable.
Sound processing can be divided into:
(1) physical treatment methods of precipitation and adsorption. Precipitation method is to remove suspended solids in the wastewater; adsorption removal of dissolved pollutants in the wastewater and decolorization.
(2) chemical treatment in France, coagulation and oxidation. And the method is to adjust the pH of the wastewater, but also to reduce the chroma in wastewater; coagulation method is the removal of disperse dyes and colloidal substances in the wastewater; oxidation is the oxidation of waste water reducing substances, sulfur dyes and vat dyes precipitate off.
(3) biological treatment, activated sludge, rotating biological contactors, biological drum and biological contact oxidation method. In order to improve water quality, to meet emission standards or recovery requirements, and often requires several approaches to joint treatment.
