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A new process of two-step treatment and reuse of pva-containing desizing wastewater

A technology of desizing wastewater and new technology, which is applied in textile industry wastewater treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc.

Active Publication Date: 2020-10-16
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a new process for the treatment of high-efficiency PVA-containing desizing wastewater in view of the problems existing in the existing technology for treating PVA-containing desizing wastewater

Method used

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  • A new process of two-step treatment and reuse of pva-containing desizing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Concentration of PVA-containing desizing wastewater by membrane separation method: pump desizing wastewater containing 0.5% PVA into the fine filter (1), filter through the fine filter (1) and collect it in the wastewater collection pool (2), through self-priming The pump (3) is pumped into the membrane separation device (4), at a temperature of 30 o C, the pressure in the membrane is 0.02MPa, the membrane separation device (4) is operated for 30min and backwashed for 20s, and concentrated 10 times to obtain a first-grade PVA concentrate containing 5% by weight and a COD1400mg / L permeate; a first-grade PVA concentrate Enter the primary PVA concentrated liquid collection tank (5); the permeate enters the permeate collection tank (11), and too much permeate enters the PVA replenishment tank (12).

[0037] 2) Pump the first-grade PVA concentrated liquid concentrated by the membrane separation system into the distillation tank (7) through the self-priming pump (6), at a ...

Embodiment 2

[0039] 1) Concentration of PVA-containing desizing wastewater by membrane separation method: pump desizing wastewater containing 1% PVA into the fine filter (1), filter through the fine filter (1) and collect it in the wastewater collection pool (2), through self-priming The pump (3) is pumped into the membrane separation device (4), at a temperature of 50 o C, membrane internal pressure 0.06MPa, membrane separation device (4) running 20min and backwashing 25s conditions, concentrate 6 times, get the first-grade PVA concentrated solution containing 6% by weight and COD1000mg / L permeate; first-grade PVA concentrated solution Enter the primary PVA concentrated liquid collection tank (5), the permeate enters the permeate collection tank (11), and too much permeate enters the PVA replenishment tank (12).

[0040] 2) Pump the primary PVA concentrated liquid concentrated by the membrane separation system into the distillation tank (7) through the self-priming pump (6), at a temperat...

Embodiment 3

[0042] 1) Concentration of PVA-containing desizing wastewater by membrane separation method: pump desizing wastewater containing 2% PVA into the fine filter (1), filter through the fine filter (1) and collect it in the wastewater collection tank (2), through self-priming The pump (3) is pumped into the membrane separation device (4), at a temperature of 70 o C, the pressure in the membrane is 0.08MPa, the membrane separation device (4) is operated for 15min and backwashed for 30s, concentrated 3.5 times, and the first-grade PVA concentrate containing 7% by weight and the COD are 800mg / L permeate; the first-grade PVA The concentrated solution enters the primary PVA concentrated solution collection tank (5); the permeate enters the permeate collection tank (11), and excessive permeate enters the PVA supplement tank (12).

[0043] 2) Pump the first-grade PVA concentrated liquid concentrated by the membrane separation system into the distillation tank (7) through the self-priming ...

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Abstract

The invention relates to a new process for the two-step treatment and reuse of PVA-containing desizing wastewater, which belongs to the field of water treatment. The two-step method includes a membrane separation system for PVA-containing desizing wastewater and a vacuum distillation concentration system; the process is as follows: After the slurry wastewater is pretreated by a fine filter, it enters the wastewater collection tank, and is pumped into the membrane separation device through a self-priming pump. The separated permeate enters the permeate collection tank, and the permeate can be used as backwash and preparation of sizing liquid Part of the source, the concentrated solution enters the first-level PVA concentrated solution collection tank; the first-level PVA concentrated solution is transported to the distillation tank to continue to concentrate, and the concentrated solution is sent to the second-level PVA concentrated solution collection tank after vacuum distillation, and the second-level PVA concentrated solution can be The sizing is directly reused, and the steam generated by the vacuum distillation is used to heat the washing water in the textile process through the heat exchanger to realize heat utilization. The process of the invention treats the desizing wastewater with high efficiency and short cycle, and realizes the dual goals of PVA pollutant reduction and resource utilization.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a new process for two-step treatment and reuse of PVA-containing desizing wastewater. Background technique [0002] Textile printing and dyeing is a traditional industry in my country and occupies an important position in the economy. Sizing and desizing are important processes in the textile printing and dyeing process. The pulp is divided into natural pulp (starch, sodium alginate), denatured pulp (soluble starch, carboxymethyl cellulose), synthetic pulp (polyvinyl alcohol PVA, etc.), mixed pulp. PVA is a water-soluble polymer compound with good sizing performance. The formed size film is very tough and has good wear resistance. There are a large number of hydroxyl groups in the PVA molecule, and it has excellent adhesion to fibers, cotton yarns and other fabrics. At the same time, PVA is a non-ionic polymer, so it has strong moisture resistance and is widely used in the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F103/30
CPCC02F1/001C02F1/04C02F1/44C02F9/00C02F2103/30
Inventor 丁金成吕恩民杜利雄卢杰马玲玲
Owner SHANDONG UNIV OF TECH
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