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Printing and dyeing wastewater treating method

A technology for printing and dyeing wastewater and treatment methods, which is applied in water/sewage treatment, water treatment parameter control, adsorbed water/sewage treatment, etc. Procedurally complex effects

Inactive Publication Date: 2017-02-15
SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past two decades, the water quality of printing and dyeing wastewater has undergone great changes. It varies with raw materials, production varieties, production processes, and management levels, resulting in very complex wastewater components after discharge from each printing and dyeing process.
Generally speaking, printing and dyeing wastewater is characterized by complex components, high organic content, deep color, high chemical oxygen demand and relatively low biochemical oxygen demand, poor biodegradability, and large discharge
Traditional printing and dyeing wastewater treatment methods, such as adsorption, filtration, coagulation, biochemical, ozone oxidation and other processes, have no obvious removal effect on COD, especially toxic and refractory organic matter and chroma, or make the effluent unable to reach the discharge or reuse requirements. Requirements, or to increase costs to invest more raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Experiments were carried out with low-concentration printing and dyeing wastewater with a COD of 100mg / L, and D311 weak base resin was added at a dosage of 2L per ton of printing and dyeing wastewater. After stirring for 30 minutes, the effluent was discharged. Subsequently, the basic resin was regenerated with 2% NaOH solution, and the regeneration rate reached 80%.

[0029] After the above process treatment, the water quality indicators of each process section are shown in the table below.

[0030] Process section wastewater pH COD / mg / L raw water 7~8 130 out of water 8~9 28~32

Embodiment 2

[0032] Experiments were carried out with low-concentration printing and dyeing wastewater with a COD of 160mg / L, and a mixture of D301 weak base resin and D201 strong base resin with a volume percentage of 2:1~4:1 was added, and the dosage was 4L per ton of printing and dyeing wastewater. After stirring and mixing for 30min~60min, the effluent can be drained out. Subsequently, the basic resin was regenerated with 3% NaOH solution, and the regeneration rate reached 80%.

[0033] After the above process treatment, the water quality indicators of each process section are shown in the table below.

[0034] Process section wastewater pH COD / mg / L raw water 7~8 150 out of water 8~9 30~39

Embodiment 3

[0036] Experiments were carried out with low-concentration printing and dyeing wastewater with a COD of 200mg / L, and a mixture of D301 weak base resin and 717 strong base resin with a volume percentage of 3:2~2:1 was added, and the dosage was 5L per ton of printing and dyeing wastewater. After stirring and mixing for 30min~90min, the effluent can be drained out. Subsequently, the basic resin was regenerated with 4% NaOH solution, and the regeneration rate reached 70%.

[0037] After the above process treatment, the water quality indicators of each process section are shown in the table below.

[0038] Process section wastewater pH COD / mg / L raw water 7~8 180 out of water 8~9 40~48

[0039] In summary, the printing and dyeing wastewater treatment method of the present invention can directly treat the printing and dyeing wastewater with a COD of 100 mg / L to 200 mg / L by using a weak base resin or a combination of a weak base resin and a strong base ...

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PUM

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Abstract

The invention provides a printing and dyeing wastewater treating method. The printing and dyeing wastewater treating method includes the step of mixing printing and dyeing wastewater with alkali resins with stirring for absorption, wherein the alkali resins are weak alkali resins or combinations of the weak alkali resins and strong alkali resins. The printing and dyeing wastewater treating method has the advantages that by adopting the strong alkali resins and / or the weak alkali resins to treat the printing and dyeing wastewater, COD (chemical oxygen demand) of outlet water can be controlled below 50mg / L, the problem of complexity in an existing low-concentration printing and dyeing wastewater treating process is solved, and the outlet water is enabled to satisfy the requirements of discharging or recycling.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a printing and dyeing wastewater treatment method with simple treatment process and low effluent COD. Background technique [0002] Before the 1980s, the biodegradability of printing and dyeing wastewater in my country was relatively high. Using the traditional combined biological and physical chemical treatment system, the effluent can meet the discharge standard. However, in the past two decades, the water quality of printing and dyeing wastewater has undergone great changes. It varies with raw materials, production varieties, production processes, and management levels, resulting in very complex wastewater components after discharge from each printing and dyeing process. Generally speaking, printing and dyeing wastewater is characterized by complex components, high organic content, deep color, high chemical oxygen demand and relatively low biochemical oxygen demand, poor bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F101/30
CPCC02F1/285C02F2101/308C02F2209/08C02F2303/16
Inventor 陈建军张柯王婷孙照
Owner SUZHOU QINGRAN ENVIRONMENTAL PROTECTION TECH
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