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Method for treating DSD acid oxidized waste water using electrolytic process

A technology of acid oxidation and electrolysis, which is applied in the field of DSD acid, can solve the problems of aggravating the difficulty of wastewater treatment and no substantive breakthroughs

Inactive Publication Date: 2006-07-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] 2. Foreign dye wastewater treatment process
[0028] Judging from the status quo of my country's dye industry wastewater treatment technology, although after years of hard work, a number of practical technologies have been obtained and many problems have been solved, but there is no substantial breakthrough in general, especially unreasonable factors such as product structure and factory layout. Existence, aggravating the difficulty of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the impact of wastewater dilution factor on COD and chromaticity

[0038] 1) Take 8L of raw wastewater, dilute it three times to 24L, and pour it into the electrolytic cell.

[0039] 2) Adjust the current (I) to 20A, start timing, and sample for two hours of electrolysis (T).

[0040] 3) Take 4.8L and 2.4L of the original wastewater, dilute them five times and ten times respectively to 24L, and pour them into the electrolytic cell. Repeat step 2).

[0041] 4) Determination of COD and chromaticity of three water samples.

[0042] When the capacity of electrolytic wastewater is 24L, the dilution factor is five times, the effect is better, the color is slightly lighter, but still dark brown, and the COD removal rate is close to 50%.

Embodiment 2

[0043] Embodiment 2: the influence of the plate height of the electrolytic cell on COD and chromaticity

[0044] 1) Take 12L of waste water diluted five times, and pour it into the electrolytic tank, so that the height of the electrode plate submerged below the liquid surface is 15cm.

[0045] 2) Adjust the current to 20A, start timing, and sample for two hours of electrolysis.

[0046] 3) Take 8L and 4L of waste water diluted five times, and pour them into the electrolytic tank respectively, so that the heights of the electrode plates submerged below the liquid level are 10cm and 5cm respectively, and repeat step 2).

[0047] 4) Measure the COD and chromaticity of the sample.

[0048] When the wastewater diluted five times is electrolyzed, the height of the electrode plate is 5cm.

Embodiment 3

[0049] Embodiment 3: the influence of electrolysis time on COD and chromaticity

[0050] 1) Take the five-fold diluted waste water and pour it into the electrolytic tank so that the height of the electrode plate submerged below the liquid level is 5 cm.

[0051] 2) Adjust the current to 20A, start timing, and take samples at 60, 90, 120, 180, 240, and 300 minutes of electrolysis.

[0052] 3) Measure the COD and chromaticity of the sample.

[0053] The optimal electrolysis time for the five-fold diluted wastewater is 180min (3 hours) when the height of the electrode plate is 5cm. The COD removal rate of the wastewater after electrolysis has reached 66.5%. Already as high as 83%.

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Abstract

The invention provides an electrolysis method to treat the sewage oxidized by DSD acid. Wherein, with NaCl, Na2SO4 or original salt in sewage as conducting medium, adjusting the plate height of electrolytic bath as 25~35cm and the work current as 30~50A; leading the diluted sewage into the bath to position of 4~8cm of plate; electrifying and electrolyzing the sewage for 2. 5~3. 5h with O2 or Cl2 on anode and H2 on cathode; using the oxidation of NaClO and reduction of H2 to destroy the dye molecular structure and decolor. This invention can desalinate and decolor at one time to let the sewage come up to discharge standard.

Description

technical field [0001] The present invention belongs to the technical field of wastewater treatment in the dye industry, and in particular provides a method for treating DSD acid oxidation wastewater by electrolysis (DSD acid is 4,4-diaminostilbene-2,2 disulfonic acid, referred to as DSD acid; 4,4-Diamino stilbene-2,2disulfonic acid (abbreviated as DSD acid), is one of the important dye intermediates. It is made from p-nitrotoluene through chemical processes such as sulfonation, oxidative condensation and reduction under certain conditions. DSD acid oxidation wastewater is mainly used to manufacture fluorescent whitening agent, direct frozen yellow G, direct yellow R, sun-fast orange F3G and moth-proofing agent, etc.). Using NaCl, Na 2 SO 4 Or the original salt in the water is used as a conductive medium, and the dye wastewater is energized and electrolyzed, and the anode produces O 2 or Cl 2 , the cathode produces H 2 , the oxidation of nascent oxygen or NaClO and the H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461
Inventor 孙春宝林海汪作胜宋波
Owner UNIV OF SCI & TECH BEIJING
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