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Treatment method for reactive dye printing and dyeing wastewater

A technology for reactive dyes and printing and dyeing wastewater, which is applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc. It can solve the problems of reduced treatment effect, incomplete oxidation, and reduced treatment efficiency, so as to improve Oxidation efficiency, reduction of wastewater discharge, and high treatment efficiency

Inactive Publication Date: 2018-08-21
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patented technical solution has the following deficiencies: 1. It is only a pretreatment method for dyeing wastewater
2. The liquid phase catalyst used cannot be recycled and will increase the metal ion content in the wastewater
3. Due to the increase of various dyeing auxiliaries in recent years, the amount of oxidant used in this method has increased, the cost has increased, and the treatment effect has decreased.
But this patent has the following deficiencies: 1. Due to the increase of various dyeing auxiliaries in recent years, the amount of oxidant used in the treatment of dyeing wastewater by this method increases, the cost rises, and the treatment effect decreases
2. The liquid phase catalyst used cannot be recycled and will increase the metal ion content in the wastewater
3. When treating dyeing wastewater with the highest concentration of pollutants, even if the amount of oxidant is increased, all dyes and auxiliaries cannot be completely oxidized, and some of them are only broken in molecular chains, which increases the difficulty of subsequent coagulation and precipitation. The operating cost of the system increases, the treatment efficiency decreases, the effluent quality is unstable, and the discharge cannot be stably met the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A treatment method for printing and dyeing wastewater of reactive dyes. The printing and dyeing wastewater is dyeing wastewater whose main dye is reactive yellow in a printing and dyeing factory. When discharged, the temperature is 67°C, the COD is 523mg / L, the pH is 10.2, and the chromaticity is 130 times , including the following steps:

[0025] (1) Drain the dyeing wastewater into the heat preservation precipitator, add polyferric sulfate at 2g / L at 60°C, stir for 6min, and after standing for 10min, discharge the supernatant into the heating tank lined with a porous ceramic carrier In the heat preservation reactor, the surface of the porous ceramic carrier is solidified with a catalyst (one, two or more combinations of copper oxide, iron oxide or manganese oxide), and the pH is adjusted to 6;

[0026] (2) Add 30% hydrogen peroxide to the solution in the step (1) at 2.5ml / L, and heat the waste water to 95° C., and react for 12 minutes.

[0027] Detect the wastewater ...

Embodiment 2

[0029] A treatment method for printing and dyeing wastewater of reactive dyes. The printing and dyeing wastewater is dyeing wastewater whose main dye is reactive red in a printing and dyeing factory. When discharged, the temperature is 78°C, the COD is 1050mg / L, the pH is 10.4, and the chroma is 3906 times , including the following steps:

[0030] (1) Discharge the dyeing wastewater into the heat preservation precipitator, at 70°C, add polyferric sulfate at 2.5g / L, stir for 5min, add polyquaternium organic polymer coagulant at 0.4g / L, stir After 8 minutes, the supernatant was discharged into a heating and holding reactor lined with a porous ceramic carrier, the surface of the porous ceramic carrier was solidified with a catalyst, and the pH was adjusted to be 6;

[0031] (2) Add 30% hydrogen peroxide to the solution of step (1) at 4.5ml / L, and heat the waste water to 95° C., and react for 15 minutes.

[0032] After the treatment, the waste water from implementation 2 was test...

Embodiment 3

[0034] A treatment method for printing and dyeing wastewater of reactive dyes. The printing and dyeing wastewater is a kind of black dyeing wastewater from a printing and dyeing factory. When discharged, the temperature is 82°C, the COD is 2338mg / L, the pH is 9.6, and the chroma is 3660 times, comprising the following steps:

[0035] (1) Discharge the dyeing wastewater into the heat preservation precipitator, add polyferric sulfate at 3g / L at 70°C, stir for 6min, add polyquaternium organic polymer coagulant at 0.6g / L, and stir for 8min Finally, the supernatant is discharged into a heating insulation reactor lined with a porous ceramic carrier, the surface of the porous ceramic carrier is solidified with a catalyst, and the pH is adjusted to be 6;

[0036] (2) Add 30% hydrogen peroxide to the solution in the step (1) at 5 ml / L, and heat the waste water to 95° C., and react for 15 minutes.

[0037] Detect the wastewater treated in Example 3: COD is 76.8mg / L, chromaticity is 2 ti...

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Abstract

The invention discloses a treatment method for reactive dye printing and dyeing wastewater. The method includes the steps of: firstly discharging printing and dyeing wastewater into a heat preservation precipitator in order, and adjusting the pH to 8-11; then adding a coagulant, discharging the supernatant obtained by coagulation sedimentation and the filter pressed wastewater of precipitate intoa heating and heat preservation reactor lined with a porous ceramic carrier, the surface of which is immobilized with a catalyst, and adjusting the pH of the wastewater to 5.5-6.5; then adding an oxidant, heating the wastewater to 80-95DEG C, and carrying out reaction to a COD of less than 80mg / L. The method firstly uses alkaline coagulation sedimentation technique to substantially remove easily precipitated slurry and macromolecular assistants from the wastewater, and then employs catalytic oxidation technique to remove difficultly precipitated components (including reactive dyes), lowers thecost and improves the oxidation efficiency, also has the characteristics of fast reaction speed, short residence time of wastewater, and high treatment efficiency. The treated wastewater has a COD ofless than 80mg / L and chroma less than 2 times, can be directly reused as rinsing water for scouring and dyeing stages, and has the advantages of high recycling rate, low emission, energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a treatment method for reactive dye printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater is one of the major discharges of industrial wastewater. It has the characteristics of large water volume, high chroma, complex composition, strong toxicity, and poor biodegradability. It is a type of industrial wastewater that is difficult to treat. According to the printing and dyeing process, printing and dyeing wastewater can be divided into fabric pretreatment wastewater, dyeing wastewater, and rinsing wastewater, among which dyeing wastewater has the highest concentration of pollutants. According to the type of dye, printing and dyeing wastewater can be divided into reactive dye printing and dyeing wastewater, acid dye printing and dyeing wastewater, direct dye printing and dyeing wastewater, etc. Among them, react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/30
CPCC02F9/00C02F2001/007C02F2101/308C02F1/02C02F1/001C02F1/722C02F1/725C02F1/727C02F1/66C02F1/56C02F1/5236
Inventor 尹庚明徐小明
Owner WUYI UNIV
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