A method for synergistically treating water-soluble polyester desizing wastewater and PVA wet spinning wastewater

By mixing water-soluble polyester desizing wastewater with PVA wet spinning wastewater, and utilizing the polyelectrolyte dissociation mechanism and multi-step treatment, the high cost and high salt content problems of traditional methods are solved, achieving efficient wastewater degradation and resource reuse.

CN115716694BActive Publication Date: 2026-07-07ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
Filing Date
2022-11-30
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Traditional methods for treating water-soluble polyester desizing wastewater and PVA wet spinning wastewater from textile enterprises require large amounts of acids, alkalis, and auxiliaries, resulting in high treatment costs and increased salt content in the wastewater, making it difficult to effectively reduce COD and salt content.

Method used

By mixing high-COD, high-alkalinity water-soluble polyester desizing wastewater with high-salt, high-acidity PVA wet spinning wastewater, the polyelectrolyte dissociation mechanism of water-soluble polyester is utilized to form flocculent suspensions. Through treatment steps such as high-density sedimentation tanks, ozone oxidation, reverse osmosis, and freeze crystallization, the COD and salt content in the wastewater is significantly reduced.

Benefits of technology

Without adding acids or alkalis to adjust the pH or adding other auxiliaries, the COD and salt content of water-soluble polyester desizing wastewater and PVA wet spinning wastewater were significantly reduced, thereby lowering treatment costs and improving treatment efficiency and microbial activity.

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Abstract

The application discloses a kind of water-soluble polyester desizing wastewater-PVA wet spinning wastewater synergic treatment method, by mixing high COD, high alkaline water-soluble polyester desizing wastewater and high salt, high acidic PVA wet spinning wastewater, combine temperature and water-soluble polyester sizing wastewater regulation, adjust the system pH and complementarily provide the required additive between the two, then continue through high density precipitation tank, ozone oxidation treatment, biological aerated filter, high-efficiency fiber filtration, twice reverse osmosis treatment, nanofiltration membrane filtration and frozen crystallization treatment, significantly reduce the COD and salt content in wastewater, obtain the reusable reclaimed water.The application realizes the effective treatment of water-soluble polyester desizing wastewater and PVA wet spinning wastewater without adding acid or base to adjust pH and without adding other additives, reduces the processing cost.
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