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PVA-containing desizing printing and dyeing wastewater pretreatment method

A printing and dyeing wastewater and pretreatment technology, which is applied in textile industry wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of accelerating the release and migration of heavy metals in the sediment, adverse effects on the ecological environment, and unstable operation. , to achieve the effects of long-term stable operation, improvement of oxidation and decomposition ability, and reduction of scale formation

Active Publication Date: 2020-03-31
HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after PVA is discharged into the water body, the release and migration of heavy metals in the sediment will be accelerated, causing adverse effects on the ecological environment.
At present, the methods for the treatment of PVA-containing desizing printing and dyeing wastewater include flocculation precipitation, iron-carbon micro-electrolysis, ozone oxidation, zero-valent iron Fenton process, high-efficiency bacterial degradation, etc., but these processes often have high operating costs, poor treatment effects, and sludge output. Large, unstable operation and other shortcomings, especially the Fenton oxidation + coagulation sedimentation method is the best for the treatment of PVA desizing printing and dyeing wastewater, and the COD removal rate can only reach 40%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for pretreatment of printing and dyeing wastewater containing PVA desizing, comprising the following steps:

[0027] S1. Add lignosulfonate, acrylamide, and ammonium persulfate to the PVA-containing desizing printing and dyeing wastewater, and mix and react to obtain a wastewater mixture, which is discharged into a regulating tank.

[0028] Of which: Wastewater COD Cr 8600mg / L, the addition of calcium lignosulfonate is 860mg / L, the addition of acrylamide is 43mg / L, and the addition of ammonium persulfate is 2.1mg / L.

[0029] S2. Control the effluent from the adjustment tank to enter the first-stage mixed reaction sedimentation tank. In the mixed reaction tank, add sulfuric acid to adjust the pH to 5-7; add ferrous sulfate 0.5g / L, mix and react; add sulfuric acid to adjust the pH to 4-5; add mass 0.1% polyacrylamide (PAM) aqueous solution 2ml / L, mixed and reacted; then precipitated in the sedimentation tank, the sedimented sludge was discharged into the sludge...

Embodiment 2

[0033] A method for pretreatment of printing and dyeing wastewater containing PVA desizing, comprising the following steps:

[0034] S1. Add lignosulfonate, acrylamide, and ammonium persulfate to the PVA-containing desizing printing and dyeing wastewater, and mix and react to obtain a wastewater mixture, which is discharged into a regulating tank.

[0035] Of which: Wastewater COD Cr 15800mg / L, the addition of calcium lignosulfonate is 1580mg / L, the addition of acrylamide is 79mg / L, and the addition of ammonium persulfate is 3.9mg / L.

[0036] S2. Control the effluent from the adjustment tank to enter the first-stage mixed reaction sedimentation tank. In the mixed reaction tank, add sulfuric acid to adjust the pH to 5-7; add ferrous sulfate 3g / L, mix and react; add sulfuric acid to adjust the pH to 4-5; add mass fraction 0.2% PAM aqueous solution 1ml / L, mixed and reacted; then precipitated in the sedimentation tank, the sedimented sludge was discharged into the sludge thicken...

Embodiment 3

[0040] A method for pretreatment of printing and dyeing wastewater containing PVA desizing, comprising the following steps:

[0041] S1. Add lignosulfonate, acrylamide, and ammonium persulfate to the PVA-containing desizing printing and dyeing wastewater, and mix and react to obtain a wastewater mixture, which is discharged into a regulating tank.

[0042] Of which: Wastewater COD Cr 11200mg / L, the addition of calcium lignosulfonate is 1120mg / L, the addition of acrylamide is 56mg / L, and the addition of ammonium persulfate is 3mg / L.

[0043] S2. Control the effluent from the adjustment tank to enter the first-stage mixed reaction sedimentation tank. In the mixed reaction tank, add sulfuric acid to adjust the pH to 5-7; add ferrous sulfate 1.5g / L, mix and react; add sulfuric acid to adjust the pH to 4-5; add mass 0.2% PAM aqueous solution 1ml / L, mixed and reacted; then precipitated in the sedimentation tank, the sedimented sludge was discharged into the sludge thickening tank, a...

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PUM

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Abstract

The invention discloses a PVA-containing desizing printing and dyeing wastewater pretreatment method, and relates to the technical field of textile printing and dyeing wastewater treatment. The methodspecifically comprises the following steps: S1, respectively adding lignosulfonate, acrylamide and ammonium persulfate into PVA-containing desizing printing and dyeing wastewater, and carrying out mixing for a reaction to obtain a wastewater mixture, S2, discharging the wastewater mixture in the step S1 into a first-stage mixed reaction sedimentation tank, adjusting the pH value by using sulfuricacid, adding ferrous sulfate for a reaction, adjusting the pH value by using sulfuric acid or alkali, adding PAM for a reaction, precipitating the mixture in a sedimentation tank, and discharging precipitated effluent into a second-stage mixing reaction sedimentation tank, and S3, adjusting the pH value with alkali in the second-stage mixing reaction sedimentation tank, carrying out an aeration reaction process in a reaction tank for 1-2h, adding ferrate and PAM into the reaction tank, carrying out a reaction process, and carrying out sedimentation in a sedimentation tank. According to the method provided by the invention, the removal rate of COD in PVA desizing printing and dyeing wastewater reaches 55%, the load of organic matters entering a biochemical treatment system is reduced, andsubsequent biochemical treatment and up-to-standard discharge of the wastewater are facilitated.

Description

technical field [0001] The invention relates to the technical field of textile printing and dyeing wastewater treatment, in particular to a pretreatment method for desizing printing and dyeing wastewater containing PVA. Background technique [0002] As a traditional industry, the textile industry has made outstanding contributions to my country's economic development, but it also produces a large amount of textile wastewater, and its wastewater discharge and COD discharge account for more than 10% of the total industrial wastewater discharge. Dyeing and finishing processing is one of the high-tech links in the textile industry chain, and it is also the most polluting link in textile printing and dyeing. Its wastewater discharge accounts for 80% of the total discharge of the textile printing and dyeing industry. Among them, the COD load produced by desizing wastewater accounts for about 50% of the total COD of printing and dyeing wastewater. [0003] Polyvinyl alcohol (PVA) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/30
CPCC02F9/00C02F2103/30C02F1/56C02F1/5236C02F7/00C02F3/30C02F2301/08
Inventor 王俊李宾宾段文杰崔俊峰田振邦杜昭赵亮
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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