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Papermaking wastewater recycling device and method based on electrochemical and electrodialysis technology

A technology of papermaking wastewater and electrodialysis, which is applied to chemical instruments and methods, processing process wastewater treatment, water/sewage treatment, etc., can solve the problems of no advanced treatment and recycling, wastewater is mostly discharged, waste of water resources, etc., to reduce Membrane cleaning and regeneration costs, eradication of biological pollution, and the effect of reducing wastewater discharge

Inactive Publication Date: 2011-12-28
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a low-cost waste water treatment method for the problems of high cost, low efficiency, mostly discharged waste water after treatment, no advanced treatment and recycling, and waste of water resources in the existing papermaking wastewater treatment method. Higher efficiency and recyclable papermaking wastewater recycling device and method based on electrochemical and electrodialysis technology

Method used

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  • Papermaking wastewater recycling device and method based on electrochemical and electrodialysis technology
  • Papermaking wastewater recycling device and method based on electrochemical and electrodialysis technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for purification, regeneration and recycling of 150 tons / day papermaking advanced treatment wastewater.

[0056] The measured indicators of the papermaking advanced treatment wastewater are shown in Table 1.

[0057] Table 1

[0058] serial number

project

unit

measured value

serial number

project

unit

measured value

1

COD Cr

mg / L

186

4

Chroma

80

2

SS

mg / L

90

5

pH

7.5

3

Turbidity

NTU

6

6

Conductivity

μS / cm

3200

[0059] After 150 tons of printing and dyeing advanced treatment wastewater is extracted by the water supply pump 12 at a flow rate of 7.5T / h, it is input into the nano-catalytic electrolysis machine 13, and the nano-catalytic electrolyzed water directly enters the sedimentation tank 14, and after precipitation, it enters the submerged ultrafiltration membrane system to remove solid...

Embodiment 2

[0069] Purification and recycling method of 3000 tons / day papermaking advanced treatment wastewater.

[0070]Described papermaking advanced treatment waste water is measured, and index is as shown in table 4:

[0071] Table 4

[0072] serial number

project

unit

measured value

serial number

project

unit

measured value

1

COD Cr

mg / L

109

4

Chroma

120

2

SS

mg / L

75

5

pH

7.5

3

Turbidity

NTU

6

6

Conductivity

μS / cm

2300

[0073] After the papermaking advanced treatment wastewater is extracted by the water supply pump 12 at a flow rate of 150T / h, it is input into the nano-catalysis electrolysis tank 13, and the nano-catalysis electrolysis water directly enters the precipitation tank 14, and after neutralization and precipitation, the ultrafiltration membrane system 22 removes solid impurities in the water, Plankt...

Embodiment 3

[0083] Purification and recycling method of 5000 tons / day papermaking advanced treatment wastewater.

[0084] The papermaking advanced treatment wastewater has been measured, and the indicators are as shown in Table 7:

[0085] Table 7

[0086] serial number

project

unit

measured value

serial number

project

unit

measured value

1

COD Cr

mg / L

265

4

Chroma

110

2

SS

mg / L

33

5

pH

7.9

3

Turbidity

NTU

7

6

Conductivity

μS / cm

7700

[0087] After the papermaking advanced treatment wastewater is extracted by the water supply pump 12 at a flow rate of 250T / h, it is input into the nano-catalytic electrolysis machine 13, and the nano-catalytic electrolyzed water directly enters the sedimentation tank 14, and after precipitation, the ultrafiltration membrane system 22 removes solid impurities and plankton in the water ...

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Abstract

Provided is an electrochemistry and electrodialysis-based apparatus for recycling wastewater from papermaking. The recycling apparatus is provided with a nano-catalytic electrolysis system, a submerged ultrafiltration separation system, an ultrafiltration membrane cleaning system, and an electrodialysis system. Also provided is a method using the apparatus for recycling the wastewater from papermaking, comprising the following steps: extracting the wastewater from papermaking and introducing same into the nano-catalytic electrolysis system; flowing the wastewater from papermaking that is purified after processing into the submerged ultrafiltration separation system to acquire dialyzed water; then feeding the dialyzed water into the electrodialysis system for desalination by electrodialysis; and acquiring desalinated water and concentrated water.

Description

technical field [0001] The invention relates to papermaking wastewater treatment, in particular to a papermaking wastewater recycling device and method based on electrochemical and electrodialysis technologies. Background technique [0002] Pulping and papermaking wastewater refers to the cooking waste liquid (also known as black liquor and red liquor) produced by chemical pulping, the middle water produced in the pulp washing and bleaching process and the white water produced in the papermaking process. Generally, 1t of organic matter and 400kg of alkalis and sulfides are dissolved in black liquor for every 1t of sulphate pulp produced; about 900kg of organic matter and 200kg of oxides (calcium, magnesium, etc.) in the liquid. The discharge of waste liquid into rivers not only seriously pollutes water sources, but also causes a lot of waste of resources. The paper industry is a traditional large water user and one of the important sources of water pollution. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/28
CPCC02F1/4676C02F9/00C02F1/444C02F2001/007C02F2103/28C02F1/4693Y02A20/124Y02A20/131
Inventor 张世文
Owner BOYING XIAMEN SCI & TECH
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