Textile dyeing wastewater advanced treatment recycling technology

Abstract

The invention discloses a textile dyeing wastewater advanced treatment recycling technology. The technology comprises the following steps: filtering to remove textile fibers; cooling; neutralizing, degrading organic matters and decomposing, replacing or degrading (cracking) the chormophoric groups of the organic matters to reduce the chroma of the wastewater; performing biochemical treatment with the biomembrane; precipitating to ensure that the precipitated sludge enters a sludge treatment system and the supernatant enters a flocculation pool; performing chemical treatment, namely adding a medicament in the flocculation pool to remove the suspended matter (SS), CODcr (chemical oxygen demand), BOD (biochemical oxygen demand) and chroma of the water; performing secondary precipitation to ensure that the free SS is precipitated and the wastewater is decolored further; separating to remove and degrade the chloride ions of the reuse water; performing secondary biochemical treatment to further reduce the concentrations of the SS, CODcr and BOD in wastewater; performing ozone oxidation treatment, decoloring, degrading organic matters; performing chemical treatment to remove insoluble dye materials and SS and reduce the COD and chroma; and performing secondary filtration, and forming an ozone / activated carbon system to ensure that the hydroxyl radicals of activated carbon are used and the organic reaction in wastewater is adopted to decolor and degrade organic matters. The invention overcomes the defects of the existing physical method, chemical method and chemical method treatment technologies; and the technology has been used in many enterprises, and the good treatment effects are obtained.

Description

technical field [0001] The invention relates to a technology for advanced treatment and reuse of textile dyeing and finishing wastewater, in particular to a technology for advanced treatment and reuse of wastewater generated in textile printing and dyeing operations. Background technique [0002] At present, there are physical, chemical and biological methods for the treatment of textile dyeing and finishing wastewater. Printing and dyeing wastewater contains a large amount of organic components such as dyes, sizing agents, and surfactants. It has large chroma, strong alkalinity, and organic matter concentration. High-level characteristics, wastewater discharge has gaps, poor biochemical properties, it is difficult to effectively treat dye wastewater by physical methods, and the material consumption is high, energy consumption is high, and operating costs are also high; chemical methods are used to treat dye wastewater, and the operating costs are higher. It is not suitable ...

AI Technical Summary

Problems solved by technology

[0002] At present, there are physical, chemical and biological methods for the treatment of textile dyeing and finishing wastewater. Printing and dyeing wastewater contains a large amount of organic components such as dyes, sizing agents, and surfactants. It has large chroma, strong alkalinity, and organic matter concentration. High-level characteristics, wastewater discharge has gaps, poor biochemical properties, it is difficult to effectively treat dye wastewater by physical methods, and the material consumption is high, energy consumption is high, and operating costs are also high; chemical methods are used to treat dye wastewater, and the operating costs are higher. It is not suitable for the treatment of large-flow wastewater; the single treatment method of biological method cannot effectively treat dye wastewater, and the process is complicated

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