Printing and dyeing wastewater treatment method based on synergistic effect of anion flocculant and cation flocculant

Abstract

The invention relates to a printing and dyeing wastewater treatment method based on the synergistic effect of an anion flocculant and a cation flocculant. According to the printing and dyeing wastewater treatment method, novel PDMDAAC modified flocculants respectively containing hydrophobic long-chain alkyl groups such as dodecyl, tetradecyl and hexadecyl are selected, the quaternary ammonium salt cation in the structure of the PDMDAAC modified flocculants and an anionic dye can form a lake, the hydrophobic long chain alkyl groups can be used for further preventing the lake from eroding and dissociating by moisture and thus the structure of the lake is stabilized and meanwhile, after the previously added cationic S-PDMDAAC flocculant and the anionic dye form tiny flocculated lake particles, an appropriate amount of anionic sodium polyacrylate PASS is further added to carry out'secondary aggregation' on the formed tiny flocculated lake particles to form larger sedimentated particles and thus the sedimentation time is shorted, the purification effect of the printing and dyeing wastewater can be enhanced and the purification efficiency is improved.

Description

technical field

[0001] The invention relates to a treatment method for printing and dyeing wastewater, in particular to a treatment method for printing and dyeing wastewater based on the synergistic effect of anion and cation flocculants. Background technique

[0002] The textile industry is a traditional pillar industry of my country's national economy and an important livelihood industry, as well as an industry with obvious international competitive advantages. In order to meet people's needs for different colors of textile fabrics, it is necessary to dye them; but when dyeing, especially when dyeing deep and thick colors, due to the insufficient dyeing rate, some dyes cannot be fixed on the fabric, resulting in raw materials The waste of waste, which in turn led to the production of a large amount of colored wastewater, the chroma COD value is generally 8000 ~ 40000 mg / kg, and the COD value of some concentrated wastewater even exceeds 50000 mg / kg, the discharge of these ...

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