Method for treating dye wastewater by Fe<0>/PDS system

A dye wastewater, treatment method technology, applied in the oxidation water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult treatment, complex components, difficult organic pollutants, etc. Reduce cost, improve degradation rate, improve degradation effect

Inactive Publication Date: 2019-06-25
CHANGZHOU UNIV
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Problems solved by technology

The dyes have the characteristics of large chroma, high toxicity, complex components, poor biodegradability, large changes in water quality and quantity, and difficult treatment. If they are discharged directly without treatment and meet the standards, it will ...

Method used

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  • Method for treating dye wastewater by Fe&lt;0&gt;/PDS system
  • Method for treating dye wastewater by Fe&lt;0&gt;/PDS system
  • Method for treating dye wastewater by Fe&lt;0&gt;/PDS system

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Experimental program
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Effect test

Embodiment 1

[0015] Experimental conditions: the initial pH is 7, Fe 0 The dosage is 0.5 g / L, the dosage of PDS is 2 g / L, and the reaction temperature is 25°C. Depend on figure 1 It can be seen that when zero-valent iron is added alone, the degradation rate of rhodamine B is only 6.9%, basically no removal, which shows that zero-valent iron has a poor adsorption effect on rhodamine B and cannot effectively degrade rhodamine B.

[0016] When PDS was added alone, the degradation rate of rhodamine B was 25.6%. PDS itself has a certain oxidation ability. When PDS is dissolved in aqueous solution, a hydrolysis reaction will occur to generate persulfate (S 2 o 8 2- ), its oxidation-reduction potential is 2.01 V, which can effectively oxidize some pollutants, but its oxidation ability is relatively weak. Therefore, the degradation rate of rhodamine B in the reaction system is not high.

[0017] Fe 0 The degradation rate of rhodamine B in the / PDS system was 96.2%, compared with that of Fe ...

Embodiment 2

[0019] Experimental conditions: Fe 0 The dosage was 0.5 g / L, the dosage of PDS was 2 g / L, the reaction temperature was 25 ℃, and the initial pH were 3, 7, and 9, respectively.

[0020] Depend on figure 2 It can be seen that under acidic, neutral and alkaline conditions, Fe 0 The / PDS system has a high degradation rate for rhodamine B dye wastewater, but the degradation rate is slightly different. After 30 min of reaction, the degradation rate reached 45.4 % under acidic conditions, 40.5 % under neutral conditions, and 38.4 % under alkaline conditions.

Embodiment 3

[0022] Experimental conditions: PDS dosage is 2 g / L, initial pH is 7, reaction temperature is 25 °C, Fe 0 The dosage is 0.25, 0.5, 1.0 g / L respectively. Depend on image 3 It can be seen that when Fe 0 When the dosage increased from 0.25 g / L to 0.5 g / L, the degradation rate of Rhodamine B also increased from 85.1 % to 96.6 %, but when Fe 0 When the dosage was increased to 1 g / L, the removal rate did not increase significantly.

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Abstract

The invention relates to a method for treating dye wastewater by a Fe<0>/PDS system. In order to overcome the defects in the process of activating PDS (persulfate) by Fe<2+>, Fe<0> is used as a sourceof Fe<2+>, so that the reaction of the PDS is indirectly realized. Regardless of aerobiotic/anaerobic conditions, the conversion from the Fe<0> to the Fe<2+> can be realized. The degradation rate oncontaminants is favorably improved. Through an Fe<0> activation system, the degradation on the contaminants can be improved; a heterogeneous system built by the Fe<0> cannot cause the condition that agreat number of iron ions are dissolved in a water body to cause secondary pollution; the Fe<0> can be filtered, recovered and reutilized; the wastewater treatment cost can be reduced.

Description

technical field [0001] The invention belongs to the field of ecological environment protection, and in particular relates to a dye wastewater treatment method. Background technique [0002] As a big dye production country, our country suffers from serious dye wastewater pollution. The dye has the characteristics of large chroma, high toxicity, complex composition, poor biodegradability, large changes in water quality and quantity, and difficult treatment. If it is discharged directly without treatment to meet the standard, it will not only damage the ecological environment of the water body, but also endanger human health. development of agriculture. The outstanding problems of dye wastewater treatment mainly lie in the decolorization of wastewater and the removal of refractory organic pollutants. According to the principle of dye wastewater treatment technology, the existing dye wastewater treatment methods are roughly divided into physical methods, chemical methods, biol...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/30
Inventor 魏永高赟任冰
Owner CHANGZHOU UNIV
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