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Tanning wastewater recycling device and method based on electrochemistry and ultrafiltration

A technology of tanning wastewater and electrochemistry, applied in chemical instruments and methods, animal processing wastewater treatment, water/sewage multi-stage treatment, etc. And other issues

Inactive Publication Date: 2011-08-10
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to solve the existing tannery wastewater that consumes a lot of chemicals, discharges a large amount of sludge, fails to meet the industrial wastewater reuse standard after wastewater treatment, discharges a lot of wastewater, wastes a lot of water resources, has high cost, and is complicated to operate. and easy to bring secondary pollution and other disadvantages, to provide a COD Cr Tannery wastewater recycling device and method based on electrochemical and ultrafiltration with high removal rate, less consumption of chemicals, less sludge generation, more thorough treatment, and high water reuse rate

Method used

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  • Tanning wastewater recycling device and method based on electrochemistry and ultrafiltration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076]Step 1 desulfurization

[0077] The tannery wastewater enters the grid filter to filter and remove large particles of solids, then flows into the adjustment tank for mixing, and then pumps the wastewater from the adjustment tank into the hydraulic sieve to filter impurities such as hair removal, and then flows into the flocculation reaction tank (desulfurization reaction tank), and the bivalence is determined online The equivalent concentration of sulfur ions, add ferrous sulfate solution according to the equivalent concentration of 1:11, react desulfurization at room temperature, divalent sulfur ions react with ferrous ions to form ferrous sulfide precipitates, and separate into iron sulfide sludge and desulfurization wastewater.

[0078] Step 2 Nanocatalytic electrolysis

[0079] The wastewater desulfurized in step 1 flows into the nano-catalyzed electrolyzer for electrolysis. The working voltage of the electrolysis is 2-500V, the voltage between the two electrodes is...

Embodiment 2

[0091] The following combination figure 1 The shown embodiment of the tannery wastewater treatment and recycling device based on catalytic electrolysis and biochemical technology gives an example of the method of tannery wastewater treatment and recycling based on catalytic electrolysis and biochemical technology.

[0092] 300 tons / day tannery wastewater treatment and purification reuse project.

[0093] The measured indicators of the tannery wastewater (comprehensive wastewater) are shown in Table 4.

[0094] Table 4

[0095] serial number

project

unit

measured value

serial number

project

unit

measured value

1

COD Cr

mg / L

3560

6

S 2-

mg / L

82

2

SS

mg / L

3110

7

Chroma

3200

3

NH 3 -N

mg / L

265

8

pH

9.3

4

Cr

mg / L

120

9

Conductivity

μS / cm

3200

5

BOD5

mg / L

1730

...

Embodiment 3

[0100] 3,000 tons / day tannery treatment wastewater reuse project.

[0101] The measured indicators of the tannery wastewater (comprehensive wastewater) are shown in Table 6.

[0102] Table 6

[0103] serial number

project

unit

measured value

serial number

project

unit

measured value

1

COD Cr

mg / L

3900

6

S 2-

mg / L

92

2

SS

mg / L

4070

7

Chroma

2900

3

NH 3 -N

mg / L

283

8

pH

9.3

4

Cr

mg / L

93

9

Conductivity

μS / cm

3766

5

BOD5

mg / L

1950

10

Sodium chloride

‰

25

[0104] Waste water through water according to 150m 3 The flow rate of / h enters the grid filter to filter and remove large particles of solids, then flows into the adjustment tank for mixing, and then the wastewater in the adjustment tank is divided into 150m 3 After the flow rate of ...

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Abstract

A tanning wastewater recycling device and method based on electrochemistry and ultrafiltration relate to the treatment of one kind of wastewater. The invention provides a tanning wastewater recycling device and method based on electrochemistry and ultrafiltration, wherein the device and method have high CODCr removal rate (chemical oxygen demand), low chemical agent consumption, low sludge yield, thorough treatment and high water reuse rate. The device is provided with a grid filter, an adjusting pool, a hydraulic sizer, a nanocatalysis electrolysis flocculating machine, a sedimentation tank, an air floatation device, a biochemical tank, a secondary sedimentation tank, a secondary nanocatalysis electrolysis flocculating machine, a filter and a filter press. The method comprises the steps of flocculation and filtration, nanocatalysis electrolysis, sedimentation, air floatation, biochemical treatment, secondary catalysis electrolysis, filtration and ultrafiltration.

Description

technical field [0001] The invention relates to the treatment of tannery wastewater, in particular to a tannery wastewater recycling device and method based on electrochemistry and ultrafiltration. Background technique [0002] According to statistics, my country's tanning industry discharges more than 100 million tons of wastewater to the environment every year, accounting for about 0.3% of my country's total industrial wastewater discharge; the output value of the leather industry ranks third in the light industry, second only to papermaking And the brewing industry, it can be seen that the tanning industry not only consumes a large amount of fresh water resources every year, but also discharges a large amount of wastewater, which poses a serious threat to human health and the sustainable development of the entire society. Therefore, the treatment of tannery wastewater should be strengthened, and the treatment of tannery wastewater and the reuse of reclaimed water are very ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/24
Inventor 张世文王峰
Owner BOYING XIAMEN SCI & TECH
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