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Method and device for recovering indigoid dye

A technology of indigo dye and recovery equipment, which is applied in chemical instruments and methods, textile industry wastewater treatment, water/sewage multi-stage treatment, etc., to achieve high recovery efficiency and good sewage treatment effect

Active Publication Date: 2012-07-04
江苏常环环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, almost no one uses this method in large-scale production except for experimental or analytical needs

Method used

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  • Method and device for recovering indigoid dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of method that indigo dye reclaims, it comprises the steps:

[0021] 1) Printing and dyeing wastewater enters the filter for pre-filtration to remove fibrous substances and large particles in the water;

[0022] 2) The filtered waste water is pumped into the oxidation tank, and the oxidation tank is blown and aerated to crystallize the leuco indigo, and add sulfuric acid through the PLC controller to maintain the pH in the tank at 8;

[0023] 3) When the solenoid valve is opened, the water in the oxidation tank enters the filter tank, and the flat membrane module is aerated in the filter tank to prevent solid particles from aggregating on the membrane to reduce the membrane flux. The PLC controller controls the addition of sulfuric acid to maintain the pH in the tank at 6;

[0024] 4) Sequence of membrane module suction filtration: run for 3 minutes, pause for 2 minutes;

[0025] 5) the indigo concentrate after suction filtration for a certain period of time is...

Embodiment 2

[0029] A kind of method that indigo dye reclaims, it comprises the steps:

[0030] 1) Printing and dyeing wastewater enters the filter for pre-filtration to remove fibrous substances and large particles in the water;

[0031] 2) The filtered wastewater is pumped into the oxidation pool, and the oxidation pool is blown and aerated to crystallize the leuco indigo, and add sulfuric acid through the PLC controller to maintain the pH in the pool at 7;

[0032] 3) When the solenoid valve is opened, the water in the oxidation tank enters the filter tank, and the flat membrane module is aerated in the filter tank to prevent solid particles from accumulating on the membrane and reduce the membrane flux. The PLC controller controls the addition of sulfuric acid to maintain the pH in the tank at 4;

[0033] 4) Sequence of membrane module suction filtration: run for 3 minutes, pause for 1 minute;

[0034] 5) the indigo concentrate after suction filtration for a certain period of time is...

Embodiment 3

[0038] A kind of method that indigo dye reclaims, it comprises the steps:

[0039] 1) Printing and dyeing wastewater enters the filter for pre-filtration to remove fibrous substances and large particles in the water;

[0040] 2) The filtered waste water is pumped into the oxidation tank, and the oxidation tank is blown and aerated to crystallize the leuco indigo, and add sulfuric acid through the PLC controller to maintain the pH in the tank at 6;

[0041] 3) When the solenoid valve is opened, the water in the oxidation tank enters the filter tank, and the flat membrane module is aerated in the filter tank to prevent solid particles from accumulating on the membrane and reduce the membrane flux. The PLC controller controls the addition of sulfuric acid to maintain the pH in the tank at 5;

[0042] 4) Sequence of membrane module suction filtration: run for 4 minutes, pause for 3 minutes;

[0043] 5) the indigo concentrate after suction filtration for a certain period of time ...

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Abstract

The invention relates to a method and a device for recovering an indigoid dye. The method for recovering the indigoid dye is characterized by comprising the following steps of: (1) introducing waste water into a non-woven fabric filter for filtering; (2) pumping the filtered waste water into an oxidizing pond, blowing and aerating in the oxidizing pond, and adding sulfuric acid under the control of a PLC (Programmable Logic Controller) till the pH is between 5 and 8; (3) aerating a flat plate film assembly in the filtering pond to prevent solid particles from being gathered on a film and lowering the film flux, and adding sulfuric acid under the control of the PLC till the pH between 3 and 6; (4) running the film assembly in way of running for T1 minutes and pausing for T2 minutes; (5) discharging a concentrated solution which is concentrated by 10 times through a groove at the bottom of a filtering pond for recovering; and (6) running a water-producing self-sucking pump under the control of the PLC when the filtering pond is at a high water level, opening a battery valve between the filtering pond and the oxidizing pond when the filtering pond is at a low water level, and opening a raw water self-sucking pump for realizing automatic running when the oxidizing pond is at a low water level. The method and the device have the characteristic of good dye recovering effect.

Description

technical field [0001] The invention relates to a method and equipment for recovering indigo dye, in particular to a method and equipment for recovering indigo dye by an oxidation crystallization-membrane treatment method. Background technique [0002] Denim warp dyeing uses indigo dye and adopts a size dyeing process. It is well known that the sizing and dyeing wastewater has high chroma, high COD concentration and stable molecular structure of indigo, which is extremely difficult to treat. Limited by the size dyeing production process and the color uptake rate of indigo dye, the content of indigo dye in the discharged size dyeing wastewater is quite considerable, and indigo dye is very expensive. If it can be recycled, it will have high economic and social benefits. [0003] The methods for recovering indigo dye from wastewater include: evaporation method, precipitation method, molecular membrane method, etc. The evaporation method consumes a large amount of heat energy ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/44C02F103/30
Inventor 张晟翟康金玉顾礼明张健陈玲邱滔
Owner 江苏常环环境科技有限公司
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