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Water treatment method utilizing complex-ferrous-activated persulfate oxidation

A technology for activating persulfate and a treatment method, which is applied in the field of complex ferrous activated persulfate oxidation water treatment, and can solve the problem of harsh technical conditions for light-activated persulfate, high energy consumption and pollution of heat-activated persulfate technology. Low mineralization rate and other problems, to achieve the effect of improved removal, good durability and environmental friendliness

Inactive Publication Date: 2012-09-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Heat-activated persulfate technology has high energy consumption, while light-activated persulfate technology has harsh conditions
Compared with other activation methods, transition metal activation requires less equipment, less energy consumption, and is more economical. Iron is one of the most widely used transition metals in nature, but there are the following problems in the oxidation reaction of sodium persulfate involving ferrous iron: 1. The pH requirement of waste liquid is very high, Fe 2+ The existence of acidic conditions is required, and neutral or alkaline conditions are easy to become precipitated; 2. A large number of free ferrous ions in the solution react with persulfate very quickly, and SO 4 -· Instantaneous explosion, the oxidation reaction is completed instantly, although the reaction rate is high, but the mineralization rate of pollutants is very low; 3. Excessive ferrous ions in the reaction system will compete with pollutants for SO 4 -· , these three or four together limit the oxidation capacity of the persulfate advanced oxidation process

Method used

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  • Water treatment method utilizing complex-ferrous-activated persulfate oxidation
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  • Water treatment method utilizing complex-ferrous-activated persulfate oxidation

Examples

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Effect test

Embodiment 1

[0030] A complexed ferrous activated persulfate oxidation water treatment method, the specific steps are as follows:

[0031] (1). Take the printing and dyeing wastewater and measure the COD of the wastewater cr It is 296mg / L, and the pH is 4.0. Take two oxidation tanks, add 500mL of waste water to each of the two oxidation tanks, add 16.7 mg of sodium oxalate to one oxidation tank and stir thoroughly, and add no complexing agent to the other.

[0032] (2). Add 172 mg of ferrous sulfate heptahydrate to each of the above two oxidation tanks and stir fully.

[0033] (3). Add 148 mg of sodium persulfate to each of the two oxidation tanks in step (2), stir well, and react for 1 hour.

[0034] The results are shown in Table 1, and the results in Table 1 show that the complexed ferrous activated persulfate oxidation water treatment technology established by the present invention ensures the persistence and high efficiency of the persulfate oxidation method.

[0035] Table 1 Degra...

Embodiment 2

[0038] A complexed ferrous activated persulfate oxidation water treatment method, the specific steps are as follows:

[0039] (1) Take the printing and dyeing wastewater and measure the COD of the wastewater cr It is 348mg / L, and the pH is 6.8. Take two oxidation tanks, add 500mL waste water to each of the two oxidation tanks, add 43.0 mg of trisodium citrate dihydrate to one oxidation tank and stir thoroughly, and add no complexing agent to the other one.

[0040] (2). Add 203 mg of ferrous sulfate heptahydrate to each of the above two oxidation tanks and stir fully.

[0041] (3). Add 174 mg of sodium persulfate to each of the two oxidation tanks in step (2), stir well, and react for 4 hours.

[0042] Its result is as shown in table 2, and the result of table 2 shows that the complexed ferrous activated persulfate oxidation water treatment technology that the present invention establishes guarantees that persulfate oxidation method can be applicable to the waste water under...

Embodiment 3

[0046] A complexed ferrous activated persulfate oxidation water treatment method, the specific steps are as follows:

[0047] (1). Take the printing and dyeing wastewater and measure the COD of the wastewater crIt is 268mg / L, and the pH is 9.2. Take two oxidation tanks, add 500mL waste water to each of the two oxidation tanks, add 24.0 mg of sodium D-gluconate to one oxidation tank and stir thoroughly, and add no complexing agent to the other.

[0048] (2). Add 157 mg of ferrous sulfate heptahydrate to each of the above two oxidation tanks and stir fully.

[0049] (3). Add 134 mg of sodium persulfate to each of the two oxidation tanks in step (2), stir well, and react for 4 hours.

[0050] Its result is as shown in table 3, and the result of table 3 shows that the complexed ferrous activated persulfate oxidation water treatment technology that the present invention establishes guarantees that persulfate oxidation method can be applicable to the waste water under alkaline neu...

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Abstract

The invention discloses a water treatment method utilizing complex-ferrous-activated persulfate oxidation. The treatment method comprises the following steps: (1) firstly determining the pH value and CODcr (chemical oxygen demand) value of wastewater to be treated; (2) adding a complexing agent which is selected according to the pH value to the wastewater, and then adding ferrous ion to the wastewater for sufficiently mixing; and (3) adding a persulfate to the wastewater treated in the step (2) according to the CODcr value for full reaction to obtain purified wastewater. The method is applicable to the wastewater with various pH values; by using the method, the acid feeding cost is greatly reduced and the treatment cost of per ton of wastewater is lowered by approximate 20%; in addition, complex ferrous can slowly release free ferrous ion, thus ensuring that organic pollutants in the wastewater are durably and efficiently purified by a persulfate oxidation method and increasing the pollutant removal efficiency by 20-30%; and the method has the advantages of good durability and high efficiency, is environmentally-friendly, is easy to operate, and has great application potential in the field of environmental pollution treatment.

Description

technical field [0001] The invention relates to a complexed ferrous activated persulfate oxidation water treatment technology, which belongs to the technical field of water pollution control. Background technique [0002] At present, the advanced oxidation treatment technology of wastewater based on sulfate radicals is receiving more and more attention. Persulfate is one of the strongest oxidants in aqueous solution, its redox potential (E 0 =2.01V) higher than H 2 o 2 (E 0 =1.76V). Compared with other advanced oxidation wastewater treatment technologies, it has many advantages: solid state at room temperature, easy to store and transport; high stability, high water solubility, relatively low price. These characteristics make it a promising prospect in the advanced treatment of wastewater. [0003] Persulfate is very stable at room temperature and requires light, heat, transition metals (Fe 2+ etc.) and other activation methods to decompose persulfate radicals and hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 万金泉张成王艳马邕文黄明智兰明
Owner SOUTH CHINA UNIV OF TECH
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