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Electric coagulation decoloring method for printing and dyeing wastewater

A printing and dyeing wastewater and electrocoagulation technology, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high cost, discontinuous synthesis process, and large pollution in chemical synthesis process , to achieve the effects of easy dehydration, small amount of sedimentation and low cost

Inactive Publication Date: 2014-08-27
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]From the above analysis, the results of traditional electrochemical synthesis of PAC flocculants are high cost, discontinuous synthesis process, and the active ingredient Al The content of 13 is low; although the existing chemical synthesis can solve part of the production cost problem, due to the large pollution in the chemical synthesis process, the active ingredient of PAC is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 6L dyeing and dyeing wastewater (color 1200 times) into storage tank A, start the peristaltic pump to control the flow rate to 0.6L / h, and pump the printing and dyeing wastewater into the electrolytic cell (size L×B×H=100×34×120mm 3 , The working size is L×B×H=100×34×100mm 3 , The effective solution volume in the tank is 0.3L), after the amount of liquid in the tank is stable (then it will flow out from the other side of the electrolytic tank), insert 6 aluminum sheets with a size of 5×30×100mm into the electrolytic cell and connect Turn on the KL-001 power supply, while adding less saturated saline (to control the conductivity of the solution at about 9.8mS / cm), the control voltage is about 4V, the current is 4A, the cycle reversing time is 3 seconds, and the timing electrolysis is started, 10h After the liquid in the storage tank is completely decolorized, the voltage changes between 3.6-4.0V during the electrolysis process, collect the effluent of the electrolytic c...

Embodiment 2

[0035] Add 6L dyeing and printing wastewater (color 1400 times) into storage tank A, start the peristaltic pump to control the flow rate to 0.52L / h (due to large chroma and increased residence time), pump the printing and dyeing wastewater into the electrolytic cell (size L× B×H=100×34×120mm 3 , The working size is L×B×H=100×34×100mm 3 , The effective solution volume in the tank is 0.3L), after the amount of liquid in the tank is stable (then it will flow out from the other side of the electrolytic tank), insert 6 aluminum sheets with a size of 5×30×100mm into the electrolytic cell and connect Turn on the KL-001 power supply, while dropping saturated saline (control solution conductivity is about 9.8mS / cm), control voltage is about 4V, constant current is 4A, cycle reversing time is 3 seconds, start timing electrolysis, 11.5 After h, the liquid in the storage tank is completely decolorized. During the electrolysis, the voltage changes between 3.5-4.0V. Collect the effluent of th...

Embodiment 3

[0037] Add 6L of dyeing and dyeing wastewater (chroma 1000 times) into storage tank A, start the peristaltic pump to control the flow rate to 0.68L / h (due to small chroma and reduced residence time), pump the printing and dyeing wastewater into the electrolytic cell (size L× B×H=100×34×120mm 3 , The working size is L×B×H=100×34×100mm 3 , The effective solution volume in the tank is 0.3L), after the amount of liquid in the tank is stable (then it will flow out from the other side of the electrolytic tank), insert 6 aluminum sheets with a size of 5×30×100mm into the electrolytic cell and connect Turn on the KL-001 power supply, while dropping saturated saline (control solution conductivity is about 9.1mS / cm), control voltage is about 4V, constant current is 4A, cycle reversing time is 3 seconds, start timing electrolysis, 9h After the liquid in the storage tank is completely decolorized, the voltage changes between 3.6-4.0V during the electrolysis process. Collect the effluent of ...

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Abstract

The invention relates to an electric coagulation decoloring method for printing and dyeing wastewater. The printing and dyeing wastewater with the chroma ranging from 500 time to 1400 times and an initial pH value ranging from 6.0 to 9.0 serves as electrolyte, an electrolysis decoloring reaction is conducted in a periodical reversing pulse electrolytic cell, wherein both the positive pole and the negative pole are aluminum plates. Two adjacent electrodes of the three electrodes form one electrolysis unit, the waste water flows into a water inlet of the electrolytic cell and flows through the electrolytic cell in a gallery flowing back mode. A certain electrode current density and bath voltage are controlled, the electrolysis HRT ranges from 15 minutes to 90 minutes, and the chroma of the processed wastewater is below 50-100 times. It is found through atomic absorption detection analysis that 91.12%-97.03% of dissolved aluminum of the two poles is enriched in deposited mud, and treatment cost of each ton of water ranges from 0.3 to 0.7. Chemical agents are not added in the whole coagulation treatment process, control is simple, and the method is economical and environment-friendly.

Description

[0001] technical field [0002] The invention relates to an electrocoagulation decolorization method for printing and dyeing wastewater, which belongs to the field of printing and dyeing wastewater treatment. Background technique [0003] In recent years, polymer flocculants have been more and more used in the field of water treatment. After adding polymer flocculants, the floc sinking speed is relatively high, and the sludge produced is denser, and the dosage is higher than that of inorganic salt flocculants. Less, so it has better application value. The polymer coagulants used in most domestic water plants are still mainly polymeric aluminum salt PAC and polymeric ferric sulfate PFS. [0004] Electrocoagulation can realize on-line electrolytic production of high-efficiency flocculants without causing secondary pollution to the environment, and control and instantly add them to printing and dyeing wastewater in a highly automated manner. [0005] In 1975, polyaluminium ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/463
Inventor 皮科武张会琴
Owner HUBEI UNIV OF TECH
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