A method for degrading pollutants in water based on combination of periodate and coagulant

Abstract

The application discloses a method for degrading pollutants in water based on combination of periodate and coagulant, relates to the technical field of organic pollutant removal in water, and achieves complete removal of organic pollutants by adding a periodate oxidizing agent into a water treatment process containing organic pollutants to be treated and then stirring and reacting with a polymeric ferric sulfate colloidal coagulant. The application excavates the prospect of activating periodate by the polymeric ferric sulfate colloidal coagulant in the coagulation process of the water treatment process, has a wide application range, does not need too many instruments and equipment and energy, can save energy, and has simple operation method and complete pollutant removal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water organic pollutant removal, and particularly relates to a method for degrading water organic pollutants based on combination of periodate and coagulant. BACKGROUND

[0002] With the rapid development of industrialization and the continuous improvement of people's living standards, the use and discharge of difficult-to-degrade organic pollutants such as dyes, drugs and the like have caused great damage to the environment, and even threatened human health. Therefore, efficient treatment of organic pollutants has become an urgent task. At present, the methods for treating difficult-to-degrade organic pollutants include biological method, chemical method and physical method. However, these methods have the disadvantages of low degradation efficiency, incomplete removal effect and high cost. The emergence of advanced oxidation technology provides a new idea for treating difficult-to-degrade organic pollutants, and can better solve the above-mentioned shortcomings.

[0003] Therefore, the advanced oxidation technology has been widely applied in the field of pollutant removal. The strong oxidant periodate has attracted wide attention due to its advantages of easy activation and high chemical stability. However, its independent oxidation pollutant capacity is poor, and an activator is needed to promote the oxidation reaction. The current activation methods include homogeneous, heterogeneous and direct activation. However, these methods have some problems, such as decomposition of activator, large energy consumption and complex operation. SUMMARY

[0004] The present application aims to solve the above-mentioned problems in the prior art, and provides a method for degrading water pollutants based on combination of periodate and coagulant, which reduces the secondary input of activator, degrades more thoroughly in pollutant removal, is simpler in operation, and can effectively save energy and reduce work equipment.

[0005] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0006] A method for degrading water pollutants based on combination of periodate and coagulant, in which the pH is adjusted and polymeric ferric sulfate colloidal coagulant is added in the water body to be treated, then periodate is added to form a mixed system, and stirring reaction is carried out to realize removal of organic pollutants.

[0007] In the mixed system, the concentration of periodate is not higher than 1000.0 μM, and preferably, the concentration of periodate is 300-1000.0 μM.

[0008] In the mixed system, the concentration of polymeric ferric sulfate colloidal coagulant is not higher than 1000 mg / L, and preferably, the concentration of polymeric ferric sulfate colloidal coagulant is 750-1000 mg / L.

[0009] The pH is 7.0.

[0010] The water body containing the organic pollutants to be treated is a water body containing sulfamethoxazole (SMX).

[0011] Compared with the prior art, the technical scheme of the present application has the beneficial effects that:

[0012] The present application first combines periodate with a coagulant, polymeric ferric sulfate colloid, in a water treatment process, for the removal of organic pollutants in water; this method can completely remove organic pollutants; the chemical reagents required by the method are easy to obtain, and the activator is environmentally friendly; the operation method is simple, has high application value, is easy to popularize, does not require excessive energy and instrument equipment, and can save energy well. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Figure for the removal of sulfamethoxazole in water bodies by different concentrations of periodate;

[0014] Figure 2 Figure for the removal of sulfamethoxazole in water bodies by different dosages of polymeric ferric sulfate colloid;

[0015] Figure 3 Figure for the removal of sulfamethoxazole in water bodies at different temperatures;

[0016] Figure 4 Figure for the removal of sulfamethoxazole in water bodies at different stirring speeds;

[0017] Figure 5 Figure for the removal of sulfamethoxazole in water bodies under different water quality parameters. DETAILED DESCRIPTION

[0018] In order to make the technical problems to be solved by the present application, the technical scheme and the beneficial effects more clear and explicit, the present application will be further described in detail below in combination with the drawings and examples.

[0019] Example 1

[0020] Removal of sulfamethoxazole in water bodies by different concentrations of periodate.

[0021] 40 mL of a 10.0 mM phosphate buffered saline solution was used as a solvent, 1.0 μM sulfamethoxazole was added to obtain a water body containing organic pollutants to be treated. The above water body was adjusted to pH 7.0 with a sodium hydroxide solution and a phosphoric acid solution, then polymeric ferric sulfate colloid was added to make its concentration 500 mg / L, sodium periodate was added to the above water body to make its concentration 0, 100.0, 300.0, 500.0, 1000.0 μM, respectively, and it was fully mixed under the action of a magnetic stirrer, to obtain a mixed system, and the reaction temperature was room temperature 20℃.

[0022] During the reaction, 1 mL was taken at fixed reaction time points 0, 10, 20, 40 and 60 min and added into 10 μL 1.0 M sodium thiosulfate to stop the reaction to obtain a remaining sulfamethoxazole solution.

[0023] The organic pollutant concentration determination method of the present application is high performance liquid chromatography (HPLC, Shimadzu LC-20AD), which is coupled with an Agilent XDB-C18 column (ZORBAX Eclipse, 4.6x150 mm, particle size 5.74 μm) and a diode array detector. The mobile phase is ultrapure water and methanol at a ratio of 55 / 45, the flow rate is 0.8 mL / min, the peak time is 4.19 min, and the determination wavelength is 268 nm.

[0024] The results of determination of the remaining concentration of sulfamethoxazole by the above-described high performance liquid chromatography are shown in Table 1. Figure 1 .

[0025] Figure 1 It is shown that when the concentration of polymeric ferric sulfate is 500 mg / L and the concentration of periodate is 300.0, 500.0 and 1000.0 μM, the removal of the pollutants can be basically achieved within 40 min.

[0026] Example 2

[0027] Removal of sulfamethoxazole in water by different concentrations of polymeric ferric sulfate colloid.

[0028] Example 1 is repeated with the following differences: the concentration of periodate is kept at 500.0 μM, the concentration of polymeric ferric sulfate colloid is adjusted to be 0, 100, 200, 500, 750, 1000 mg / L, the pH is adjusted to be 7.0, and the sampling time points are 0, 10, 20, 40, 60 and 90 min. The results are shown in Table 3. Figure 2 .

[0029] Figure 2 It is shown that when the concentration of polymeric ferric sulfate colloid is 750 mg / L and the concentration of periodate is 500.0 μM, the removal effect is the best, and the removal of the pollutants can be achieved within 40 min.

[0030] Example 3

[0031] Removal of sulfamethoxazole in water at different temperatures.

[0032] Example 1 is repeated with the following differences: the concentration of periodate is kept at 500.0 μM, the concentration of polymeric ferric sulfate colloid is kept at 500 mg / L, the pH is adjusted to be 7.0, the temperature is set to be 10.0, 20.0 and 40.0 ℃, and the sampling time points are still 0, 10, 20, 40 and 60 min. The results are shown in Table 4. Figure 3 .

[0033] Figure 3 It shows that the removal of pollutants can achieve good results at room temperature 20.0℃, which shows that it does not need to consume too much energy to change the solution temperature, and the system has high adaptability.

[0034] Example 4

[0035] Removal of sulfamethoxazole in water under different stirring speeds.

[0036] Repeat Example 1, with the following differences: the concentration of periodate is kept at 500.0 μM, the concentration of PFS colloid is kept at 500 mg / L, the pH is adjusted to 7.0, the stirring speed is set to 200.0, 400.0 and 600.0 rpm, and the sampling time points are still 0, 10, 20, 40 and 60 min. The results are shown in Figures 4a) to 4f). Figure 4 .

[0037] Figure 4 It shows that different stirring speeds have no special effect on the removal of pollutants, which shows that it does not need to consume too much energy to stir the solution.

[0038] Example 5

[0039] Removal of sulfamethoxazole in water under different water quality parameters.

[0040] Repeat Example 1, with the following differences: the concentration of periodate is kept at 500.0 μM, the concentration of PFS colloid is kept at 500 mg / L, the pH is adjusted to 7.0, and 0-1.0 mM Cl - , 0-0.5 mM NO3 - , 0-1.0 mM HCO3 - , 0-50.0 μM Fe 2+ , 0-50.0 μM Cu 2+ , 0-5.0 mg / L HA (humic acid) are added, and the sampling time points are still 0, 10, 20, 40 and 60 min. The results are shown in Figures 5a) to 5f). Figure 5 a) to f).

[0041] Figure 5 It shows that different concentrations of water quality parameters have no special effect on the removal of pollutants, which shows that the system has strong selectivity, is less affected by external conditions, and is suitable for real wastewater treatment.

[0042] The present application adds periodate oxidant into the coagulation process with polymeric ferric sulfate colloid in the water treatment process, and then completely removes the organic pollutants in water. The present application activates periodate with the original polymeric ferric sulfate colloid coagulant in the water treatment process, has wide application range, does not need too many instruments and equipment and energy, can save energy, has simple operation method, and completely removes pollutants.

Claims

1. A method for degradation of pollutants in water based on combination of periodate and coagulant, characterized by: In the water body containing organic pollutants to be treated, the pH is adjusted, polymeric ferric sulfate colloid is added, then a high iodate salt is added to form a mixed system, and stirring reaction is carried out, thereby realizing removal of the organic pollutants; the water body containing organic pollutants to be treated is a water body containing sulfamethoxazole.

2. A method for degradation of pollutants in water based on combination of periodate and coagulant as claimed in claim 1, wherein: In the mixed system, the concentration of the high iodate salt is not higher than 1000.0 μM.

3. A method for degradation of pollutants in water based on combination of periodate and coagulant as claimed in claim 2, wherein: In the mixed system, the concentration of the high iodate salt is 300-1000.0 μM.

4. The method for degrading pollutants in water based on the combination of periodate and coagulant according to claim 1, characterized in that: In the mixed system, the concentration of the polymeric ferric sulfate colloid is not higher than 1000 mg / L.

5. A method for degradation of pollutants in water based on combination of periodate and coagulant as claimed in claim 4, wherein: In the mixed system, the concentration of the polymeric ferric sulfate colloid activator is 500-750 mg / L.

6. A method of degrading pollutants in water using a combination of periodate and coagulant as claimed in claim 1, wherein: The pH is 7.

0.

7. The method for degrading pollutants in water based on the combination of periodate and coagulant according to claim 1, characterized in that: The temperature for stirring reaction is 20-40 ℃, and the reaction time is 40-60 min.

Images