Method for treating alkaline printing and dyeing wastewater by utilizing waste acid

A technology for the treatment of printing and dyeing wastewater and waste acid, which is applied in textile industry wastewater treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. Deal with the problems of high cost, achieve the effect of saving clean water, excellent decolorization effect, and saving acid consumption

Inactive Publication Date: 2013-03-06
青岛海安生物环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for treating alkaline printing and dyeing wastewater with waste acid, which solves the problems of poor degradability of the printing and dyeing wastewater treatment process, difficulty in decolorization, and incomplete reaction of aerobic biochemical units in actual operation, resulting in relatively high cost of subsequent physical and chemical treatment.

Method used

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  • Method for treating alkaline printing and dyeing wastewater by utilizing waste acid
  • Method for treating alkaline printing and dyeing wastewater by utilizing waste acid

Examples

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Effect test

Embodiment 1

[0042] A method for treating alkaline printing and dyeing wastewater with waste acid, comprising the following steps:

[0043] 1) Alkaline printing and dyeing wastewater, enter the adjustment tank for pH measurement, and adjust the pH value to ensure that the pH value is between 11 and 13. When the pH value is too low, the effect of the waste acid decolorizer is not obvious.

[0044] 2) Transport the pH-adjusted wastewater from the adjustment tank to the sedimentation tank through pipelines. In the outlet pipeline of the adjustment tank, add pickling waste liquid according to the dosage of 3‰ of the wastewater weight, so that the wastewater and waste acid decolorizer are in the Mix well in the pipe. If the decolorizing effect is not good, the mixing time of the decolorizing agent and wastewater can be extended to increase the mixing effect.

[0045] 3) Add polyacrylamide according to the dosing amount of 0.3ppm into the pipeline where the decolorized wastewater enters the sed...

Embodiment 2

[0049] A method for treating alkaline printing and dyeing wastewater with waste acid, comprising the following steps:

[0050] 1) Alkaline printing and dyeing wastewater, enter the adjustment tank for pH measurement, and adjust the pH value to ensure that the pH value is between 11 and 13. When the pH value is too low, the effect of the waste acid decolorizer is not obvious.

[0051] 2) Transport the pH-adjusted wastewater from the adjustment tank to the sedimentation tank through pipelines. In the outlet pipeline of the adjustment tank, add pickling waste liquid according to the dosage of 5‰ of the wastewater weight, so that the wastewater and waste acid decolorizer are in the Mix well in the pipe. If the decolorizing effect is not good, the mixing time of the decolorizing agent and wastewater can be extended to increase the mixing effect.

[0052] 3) Add polyacrylamide according to the dosing amount of 1ppm into the pipeline where the decolorized wastewater enters the sedim...

Embodiment 3

[0056] A method for treating alkaline printing and dyeing wastewater with waste acid, comprising the following steps:

[0057] 1) Alkaline printing and dyeing wastewater, enter the adjustment tank for pH measurement, and adjust the pH value to ensure that the pH value is between 11 and 13. When the pH value is too low, the effect of the waste acid decolorizer is not obvious.

[0058] 2) Transport the pH-adjusted wastewater from the adjustment tank to the sedimentation tank through pipelines. In the outlet pipeline of the adjustment tank, add pickling waste liquid according to the dosage of 8‰ of the wastewater weight, so that the wastewater and waste acid decolorizer are in the Mix well in the pipe. If the decolorizing effect is not good, the mixing time of the decolorizing agent and wastewater can be extended to increase the mixing effect.

[0059] 3) Add polyacrylamide according to the dosing amount of 1.5ppm into the pipeline where the decolorized wastewater enters the sed...

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Abstract

The invention relates to a treatment process of industrial wastewater, in particular to a method for treating alkaline printing and dyeing wastewater by utilizing waste acid. The method comprises the following steps of: 1), measuring the pH value of the alkaline printing and dyeing wastewater, and ensuring that the pH value is between 11 and 13; 2), adding a waste acid decoloring agent to carry out decoloring treatment; 3), adding a flocculating agent, standing and precipitating to obtain supernatant fluid and sludge; 4), adding an industrial sodium hypochlorite solution and the flocculating agent to the supernatant fluid to further treat the obtained supernatant fluid; and 5), discharging and dewatering the sludge to obtain dewatered sludge and clear water, discharging the sludge, returning the clear water to the first step, mixing the clear water with the alkaline printing and dyeing wastewater to treat again. The method provided by the invention is simple in treatment procedure, and is easy to operate; the pH value of the treated clear water is in the range of 6-9; the pH value does not need to be further adjusted, so that the clear water can be recycled again in a printing and dyeing washing production line for utilization; and the dosage of the acid is saved.

Description

technical field [0001] The invention relates to an industrial waste water treatment process, in particular to a method for treating alkaline printing and dyeing waste water with waste acid. Background technique [0002] Printing and dyeing wastewater refers to the wastewater discharged during the pretreatment, dyeing, printing and finishing of cotton, wool, hemp, silk, chemical fiber or blended products. Printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, deep color, high alkalinity, and large changes in water quality. It is a difficult-to-treat industrial wastewater. There are four main treatment methods for printing and dyeing wastewater, physical treatment, chemical treatment, biological treatment, and alkali reduction treatment. [0003] Printing and dyeing wastewater has poor biodegradability and is difficult to decolorize. The decolorization effect of printing and dyeing wastewater is one of the key indicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/30
Inventor 徐云龙江安
Owner 青岛海安生物环保有限公司
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