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Method for reducing content of sulfite ions in printing and dyeing decoloration wastewater

A technology of sulfite and ion content, applied in chemical instruments and methods, textile industry wastewater treatment, water pollutants, etc., can solve problems such as failure to meet demand, and achieve the effect of less pharmaceutical usage and low comprehensive use cost

Pending Publication Date: 2021-06-29
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are very few reports on reducing the content of sulfite ions in domestic and foreign standards and literatures, and the content of sulfite ions is only detected by different methods, which has great limitations in practical industrial applications. , can not meet the needs of modern industry

Method used

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  • Method for reducing content of sulfite ions in printing and dyeing decoloration wastewater

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Experimental program
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Embodiment

[0026] Take a sample V of printing and dyeing decolorization wastewater from a factory, and adjust its pH to about 7. Add 3g / L of calcium chloride corresponding to the volume of the sample, turn on the magnetic stirring switch, and the magnetic stirring bar in the beaker rotates at a constant speed. After stirring for 15 minutes, add 1000 ppm of PAC solution, and then stir for 15 minutes, then add 5 ppm of PAM solution. After standing still for precipitation, obtain the supernatant.

[0027] Adjust the pH of the supernatant to about 6, add 10ml / L, 20ml / L, 30ml / L, 50ml / L and 70ml / L of 3% H 2 o 2 solution. After stirring for 30 minutes, let it stand still for 30 minutes, and take the supernatant to obtain the treated water sample. Take 100ml and add different concentrations of H 2 o 2 The water sample was injected into 5 Erlenmeyer flasks to obtain the solution to be tested. Finally, the sulfite ion content of each water sample in each Erlenmeyer flask was measured by iod...

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Abstract

The invention discloses a method for reducing the content of sulfite ions in printing and dyeing decoloration wastewater, belonging to the field of industrial wastewater treatment. The method comprises the following specific steps: adjusting the pH value of a water sample to be about 7, sequentially adding calcium chloride, a PAC solution and a PAM solution, conducting stirring for a period of time, carrying out standing for precipitation, and taking a supernatant; and adjusting the pH value of the supernatant to about 6, adding an H2O2 solution, carrying out stirring and standing, and taking a supernatant water sample. According to the results of testing, the content of sulfite ions in the treated wastewater sample is obviously reduced, and the method has the advantages of low comprehensive cost, simplicity and convenience in operation and the like. The method provided by the invention is suitable for treating printing and dyeing decoloration wastewater with a very high sulfite ion content.

Description

technical field [0001] The invention belongs to the technical field of industrial environment, and in particular relates to a method for reducing the content of sulfite ions in printing and dyeing decolorization wastewater. Background technique [0002] In the printing and dyeing industry, hydrosulfite (sodium dithionite) and sodium hypochlorite are used when decolorizing denim and other fabrics. After decolorization, a large amount of wastewater will be generated. These wastewater will contain a large amount of organic matter and sulfite ions. Excessive content of sulfite ions in printing and dyeing decolorization wastewater will lead to difficulties in discharge and fail to meet the national wastewater discharge standards. And when the wastewater containing too much sulfite ion is discharged, it will cause great harm to the human body and the environment. Sulfite ions can inhibit biological bacteria from degrading organic matter, and even kill biological bacteria and caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/30
CPCC02F9/00C02F2103/30C02F2101/101C02F1/5245C02F1/56C02F1/722
Inventor 张昊洪波曾云雄戴军王超
Owner CHINA JILIANG UNIV
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