Treatment method of tobacco sheet production wastewater

Abstract

The invention provides a tobacco sheet production wastewater treatment method, which comprises: (1) carrying out sand filtration adsorption treatment on tobacco sheet production wastewater to obtain primary filtration wastewater; (2) carrying out activated carbon adsorption treatment on the primarily filtered wastewater to obtain reclaimed water; and (3) carrying out oxidative degradation treatment on the reclaimed water to obtain wastewater meeting the emission standard. Through double adsorption of sand filtration and activated carbon, impurities and part of organic matters in sewage can be effectively removed, a foundation is laid for subsequent treatment, COD and chromaticity of the sewage can be remarkably reduced through oxidative degradation, the sewage can reach stricter emission standards, and pollution to the environment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment and relates to a method for treating wastewater from tobacco sheet production. Background Art

[0002] my country is a big tobacco-growing country. Due to factors such as planting technology, geographical environment and climate, a certain amount of low-grade tobacco cannot be purchased every year. These tobaccos cannot be burned or used as fertilizers, becoming a burden for tobacco farmers. In addition, nearly one-third of tobacco stems are discarded as waste in tobacco factories. Waste tobacco contains a variety of valuable components, such as nicotine, solanesol, sugars, etc. The use of papermaking to make tobacco flakes is one of the important technologies for the comprehensive recycling of tobacco waste. Since the papermaking method for making tobacco flakes follows the papermaking process and chemical extraction technology in some process links, it is inevitably characterized by high water consumption and high wastewater generation. The wastewater contains a large amount of fiber, and has the characteristics of high chromaticity, poor biodegradability, and nicotine that is not conducive to the growth of microorganisms. It is a high-concentration and difficult-to-treat organic wastewater.

[0003] In the sewage treatment station of tobacco flake enterprises, the wastewater in the final sedimentation tank usually has a certain COD and chromaticity. The chemical oxygen demand (COD) is a chemical method to measure the amount of reducing substances that need to be oxidized in the water sample. The oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in wastewater, effluent from wastewater treatment plants and contaminated water. In existing wastewater treatment technologies, the traditional activated sludge method is generally used, and the residence time of wastewater in the aeration tank is 6-8h. However, for every ton of flakes produced by papermaking tobacco flake enterprises, 50-120 tons of organic wastewater will be generated. When a large amount of wastewater is treated according to the activated sludge method, due to the shortened residence time of the wastewater, abnormal sludge swelling will occur, affecting the quality of wastewater treatment.

[0004] CN105293657A discloses a method for deep treatment of papermaking reconstituted tobacco wastewater, comprising the following steps: firstly dissolving hydrated ferrous sulfate and adding sulfuric acid for acidification, then adding a phosphate stabilizer at 40-60°C under stirring conditions, then adding a sodium chlorate oxidant, and continuously stirring the reaction for about 2 hours to obtain a high-efficiency polyphosphate ferric sulfate coagulant.

[0005] CN103359896A discloses a method for treating and regenerating wastewater from tobacco sheet production, which comprises the following steps: slag removal → chemical decalcification → flotation → anaerobic treatment → electrolysis → A / O treatment → secondary electrolysis → membrane treatment / aerated biological filter biochemical → tertiary electrolysis → desalination → regenerated water.

[0006] The treatment method for tobacco sheet production wastewater described in the above scheme is complicated and uses many types of treatment reagents, which is costly and has low efficiency in practical applications. Summary of the invention

[0007] The purpose of the present invention is to provide a method for treating wastewater from tobacco sheet production. The present invention can effectively remove impurities and some organic matter in sewage through double adsorption of sand filtration and activated carbon, laying a foundation for subsequent treatment. Then, through oxidative degradation, the COD and chromaticity of sewage can be significantly reduced, so that it can meet more stringent emission standards and reduce pollution to the environment.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a method for treating wastewater from tobacco sheet production, the method comprising the following steps:

[0010] (1) treating tobacco flake production wastewater by sand filtration and adsorption to obtain primary filtered wastewater;

[0011] (2) treating the primary filtered wastewater with activated carbon adsorption to obtain reclaimed water;

[0012] (3) treating the reclaimed water by oxidation and degradation to obtain wastewater that meets the discharge standards;

[0013] The initial COD of the tobacco sheet production wastewater is ≥200 mg / L, and the chromaticity is ≥100 times.

[0014] The present invention performs sand filtration adsorption treatment on tobacco sheet production wastewater to remove part of the suspended matter and part of the chromaticity, and then further reduces the chromaticity and COD in the wastewater through activated carbon adsorption treatment. Finally, the organic matter in the wastewater is degraded through oxidative degradation treatment, which can significantly reduce the COD and chromaticity of the sewage, so that it meets more stringent discharge standards and reduces pollution to the environment.

[0015] The wastewater meeting the discharge standard of the present invention meets the national "Papermaking Industry Water Pollutant Discharge Standard" GB3544-2001 standard.

[0016] Preferably, the adsorbent used in the sand filtration adsorption treatment in step (1) comprises quartz sand.

[0017] Preferably, the median particle size D50 of the quartz sand used in the sand filtration adsorption treatment in step (1) is 1 mm to 2 mm, for example: 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, etc., not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] The smaller the particle size of the quartz sand used in the sand filtration adsorption treatment of the present invention, the larger the adsorption surface and the better the adsorption effect. However, the particle size cannot be too small, because too small a particle size will slow down the flow rate and reduce the service life of the activated carbon and quartz sand.

[0019] Preferably, the flow rate of the sand filtration adsorption treatment in step (1) is 3 t / h to 5 t / h, for example: 3 t / h, 3.5 t / h, 4 t / h, 4.5 t / h or 5 t / h, etc., not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Preferably, the environmental pressure of the sand filtration adsorption treatment in step (1) is 0.8 MPa to 1.2 MPa, for example, 0.8 MPa, 0.9 MPa, 1 MPa, 1.1 MPa or 1.2 MPa, etc., and is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0021] Preferably, the time of the sand filtration adsorption treatment in step (1) is 20 min to 30 min, for example, 20 min, 22 min, 25 min, 28 min or 30 min, etc., not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0022] Preferably, the activated carbon used in the activated carbon adsorption treatment in step (2) comprises coconut shell activated carbon.

[0023] Preferably, the median particle size D50 of the coconut shell activated carbon is 2 mm to 4 mm, for example, 2 mm, 2.5 mm, 3 mm, 3.5 mm or 4 mm, etc., not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0024] Preferably, the iodine value of the coconut shell activated carbon is 800 mg / g to 1200 mg / g, for example: 800 mg / g, 900 mg / g, 1000 mg / g, 1100 mg / g or 1200 mg / g, etc., not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0025] Preferably, the flow rate of the activated carbon adsorption treatment in step (2) is 3 t / h to 5 t / h, for example: 3 t / h, 3.5 t / h, 4 t / h, 4.5 t / h or 5 t / h, etc., not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0026] Preferably, the environmental pressure of the activated carbon adsorption treatment in step (2) is 0.8MPa to 1.2MPa, for example: 0.8MPa, 0.9MPa, 1MPa, 1.1MPa or 1.2MPa, etc., not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0027] Due to the special properties of tobacco flake wastewater, the present invention sets a high-pressure environment during the sand filtration adsorption and activated carbon adsorption process to increase the flow rate and thus improve the adsorption efficiency.

[0028] Preferably, the time for the activated carbon adsorption treatment in step (2) is 20 min to 30 min, for example, 20 min, 22 min, 25 min, 28 min or 30 min, etc., not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0029] Preferably, the oxidant used in the oxidative degradation treatment in step (3) comprises sodium hypochlorite.

[0030] Preferably, during the oxidative degradation treatment in step (3), the concentration of the oxidant is 0.1 g / L to 0.3 g / L, for example, 0.1 g / L, 0.15 g / L, 0.2 g / L, 0.25 g / L or 0.3 g / L, etc., and is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0031] Preferably, the time of the oxidative degradation treatment in step (3) is 4 h to 6 h, for example 4 h, 4.5 h, 5 h, 5.5 h or 6 h, etc., not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The present invention can effectively remove impurities and some organic matter in sewage through double adsorption of sand filtration and activated carbon, laying the foundation for subsequent treatment. Then, through oxidative degradation, the COD and chromaticity of sewage can be significantly reduced, so that it can meet more stringent emission standards and reduce pollution to the environment.

[0034] (2) The method for treating wastewater from tobacco sheet production of the present invention can obtain wastewater that meets the discharge standard, and the COD can reach less than 90 mg / L, and the chromaticity can reach less than 30 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1This is a schematic diagram of the treatment process of tobacco flake production wastewater provided by an embodiment of the present invention, wherein 1 is tobacco flake production wastewater, 2 is sand filtration adsorption, 3 is primary filtration wastewater, 4 is activated carbon adsorption, 5 is reclaimed water, 6 is sodium hypochlorite, 7 is oxidative degradation, and 8 is wastewater that meets the discharge standards. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0037] The initial COD of the tobacco sheet production wastewater used in the examples of the present invention and the comparative examples is 200 mg / L, and the chromaticity is 100 times.

[0038] Example 1

[0039] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0040] (1) Using quartz sand with a median particle size D50 of 1.5 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0041] (2) using coconut shell activated carbon with a median particle size D50 of 3 mm and an iodine value of 1000 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0042] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0043] Example 2

[0044] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0045] (1) Using quartz sand with a median particle size D50 of 1 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 20 min at an ambient pressure of 0.8 MPa, and the flow rate of the tobacco flake production wastewater was 5 t / h to obtain primary filtered wastewater;

[0046] (2) using coconut shell activated carbon with a median particle size D50 of 2 mm and an iodine value of 1200 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 20 min at an ambient pressure of 0.8 MPa, and the flow rate of the primary filtered wastewater was 5 t / h to obtain reclaimed water;

[0047] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 5 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.2 g / L.

[0048] Example 3

[0049] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0050] (1) Using quartz sand with a median particle size D50 of 2 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 30 min at an ambient pressure of 1.2 MPa, and the flow rate of the tobacco flake production wastewater was 3 t / h to obtain primary filtered wastewater;

[0051] (2) using coconut shell activated carbon with a median particle size D50 of 4 mm and an iodine value of 800 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 30 min at an ambient pressure of 1.2 MPa, and the flow rate of the primary filtered wastewater was 3 t / h to obtain reclaimed water;

[0052] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 4 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.1 g / L.

[0053] Example 4

[0054] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0055] (1) Using quartz sand with a median particle size D50 of 0.5 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0056] (2) using coconut shell activated carbon with a median particle size D50 of 3 mm and an iodine value of 1000 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0057] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0058] Example 5

[0059] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0060] (1) Using quartz sand with a median particle size D50 of 3 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an environmental pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0061] (2) using coconut shell activated carbon with a median particle size D50 of 3 mm and an iodine value of 1000 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0062] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0063] Example 6

[0064] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0065] (1) Using quartz sand with a median particle size D50 of 1.5 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0066] (2) using coconut shell activated carbon with a median particle size D50 of 1 mm and an iodine value of 1000 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0067] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0068] Example 7

[0069] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0070] (1) Using quartz sand with a median particle size D50 of 1.5 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0071] (2) using coconut shell activated carbon with a median particle size D50 of 5 mm and an iodine value of 1000 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0072] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0073] Example 8

[0074] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0075] (1) Using quartz sand with a median particle size D50 of 1.5 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0076] (2) using coconut shell activated carbon with a median particle size D50 of 3 mm and an iodine value of 600 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0077] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0078] Example 9

[0079] This embodiment provides a method for treating wastewater from tobacco sheet production. The process diagram of the method is as follows: Figure 1 As shown, the processing method comprises the following steps:

[0080] (1) Using quartz sand with a median particle size D50 of 1.5 mm, the tobacco flake production wastewater was subjected to sand filtration adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the tobacco flake production wastewater was 4 t / h to obtain primary filtered wastewater;

[0081] (2) using coconut shell activated carbon with a median particle size D50 of 3 mm and an iodine value of 1500 mg / g, the primary filtered wastewater was subjected to activated carbon adsorption treatment for 25 min at an ambient pressure of 1 MPa, and the flow rate of the primary filtered wastewater was 4 t / h to obtain reclaimed water;

[0082] (3) Sodium hypochlorite is added to the reclaimed water for oxidative degradation treatment for 6 hours to obtain wastewater that meets the discharge standards, wherein the mass concentration of sodium hypochlorite in the reclaimed water is 0.3 g / L.

[0083] Comparative Example 1

[0084] The only difference between this comparative example and Example 1 is that no sand filtration adsorption is performed, and other conditions and parameters are exactly the same as those in Example 1.

[0085] Comparative Example 2

[0086] The only difference between this comparative example and Example 1 is that no activated carbon adsorption is performed, and other conditions and parameters are exactly the same as those in Example 1.

[0087] Comparative Example 3

[0088] The only difference between this comparative example and Example 1 is that no oxidative degradation is performed, and other conditions and parameters are exactly the same as those in Example 1.

[0089] Performance Test:

[0090] The COD and chromaticity of the wastewater meeting the discharge standard were obtained by testing the examples and comparative examples. The test results are shown in Table 1:

[0091] Table 1

[0092]

[0093]

[0094] As can be seen from Table 1, from Examples 1-3, the method for treating tobacco sheet production wastewater of the present invention can obtain wastewater with a COD of less than 90 mg / L and a chromaticity of less than 30 times that of the wastewater meeting the discharge standard.

[0095] By comparing Example 1 with Examples 4-5, it can be seen that in the treatment process of tobacco sheet production wastewater described in the present invention, the particle size of the quartz sand used in the sand filtration adsorption treatment will affect the treatment effect. The median particle size D50 of the quartz sand used in the sand filtration adsorption treatment is controlled at 1mm to 2mm, and the treatment effect is better. If the median particle size D50 of the quartz sand used in the sand filtration adsorption treatment is too large, the COD and chromaticity treatment effects are significantly reduced. If the median particle size D50 of the quartz sand used in the sand filtration adsorption treatment is too small, the flow rate of the wastewater is too slow, the service life of the quartz sand is shortened, and the cost is increased.

[0096] By comparing Example 1 with Examples 6-7, it can be seen that in the treatment process of tobacco sheet production wastewater described in the present invention, the particle size of the coconut shell activated carbon used in the activated carbon adsorption treatment will affect the treatment effect. The median particle size D50 of the coconut shell activated carbon used in the activated carbon adsorption treatment is controlled at 2mm to 4mm, and the treatment effect is better. If the median particle size D50 of the coconut shell activated carbon used in the activated carbon adsorption treatment is too large, the COD and chromaticity treatment effects are significantly reduced. If the median particle size D50 of the coconut shell activated carbon used in the activated carbon adsorption treatment is too small, the flow rate of the wastewater is too slow, the service life of the coconut shell activated carbon is shortened, and the cost is increased.

[0097] By comparing Example 1 with Examples 8-9, it can be seen that in the treatment process of tobacco sheet production wastewater described in the present invention, the iodine value of the coconut shell activated carbon used in the activated carbon adsorption treatment will affect the treatment effect. The iodine value of the coconut shell activated carbon used in the activated carbon adsorption treatment is controlled at 800 mg / g to 1200 mg / g, and the treatment effect is better. If the iodine value of the coconut shell activated carbon used in the activated carbon adsorption treatment is too large, the adsorption effect will not be further improved, but the cost will increase. If the iodine value of the coconut shell activated carbon used in the activated carbon adsorption treatment is too small, the adsorption effect is poor, and the COD and chromaticity treatment effects are significantly reduced.

[0098] From the comparison between Example 1 and Comparative Example 1, it can be seen that the present invention can remove part of the suspended matter and part of the chromaticity through sand filtration adsorption treatment, thereby reducing the difficulty of subsequent activated carbon adsorption treatment.

[0099] From the comparison between Example 1 and Comparative Example 2, it can be seen that the present invention further reduces the chroma and COD in the wastewater through activated carbon adsorption treatment, providing a basis for subsequent oxidative degradation.

[0100] By comparing Example 1 with Comparative Example 3, it can be seen that the present invention can significantly reduce the COD and chromaticity of the sewage by degrading organic matter in the wastewater through oxidative degradation, so that it meets more stringent emission standards and reduces pollution to the environment.

[0101] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A method for treating wastewater from tobacco sheet production, characterized in that: The processing method comprises the following steps: (1) treating tobacco flake production wastewater by sand filtration and adsorption to obtain primary filtered wastewater; (2) treating the primary filtered wastewater with activated carbon adsorption to obtain reclaimed water; (3) treating the reclaimed water by oxidation and degradation to obtain wastewater that meets the discharge standards; The initial COD of the tobacco sheet production wastewater is ≥200 mg / L, and the chromaticity is ≥100 times.

2. The processing method according to claim 1, characterized in that: The adsorbent used in the sand filtration adsorption treatment in step (1) includes quartz sand; Preferably, the median particle size D50 of the quartz sand is 1 mm to 2 mm.

3. The processing method according to claim 1 or 2, characterized in that: The flow rate of the sand filtration adsorption treatment in step (1) is 3t / h to 5t / h.

4. The processing method according to any one of claims 1 to 3, characterized in that: The environmental pressure of the sand filtration adsorption treatment in step (1) is 0.8MPa to 1.2MPa.

5. The processing method according to any one of claims 1 to 4, characterized in that: The time of the sand filtration adsorption treatment in step (1) is 20 minutes to 30 minutes.

6. The processing method according to any one of claims 1 to 5, characterized in that: The activated carbon used in the activated carbon adsorption treatment in step (2) comprises coconut shell activated carbon; Preferably, the median particle size D50 of the coconut shell activated carbon is 2 mm to 4 mm; Preferably, the iodine value of the coconut shell activated carbon is 800 mg / g to 1200 mg / g.

7. The processing method according to any one of claims 1 to 6, characterized in that: The flow rate of the activated carbon adsorption treatment in step (2) is 3 t / h to 5 t / h; Preferably, the ambient pressure of the activated carbon adsorption treatment in step (2) is 0.8 MPa to 1.2 MPa; Preferably, the time for the activated carbon adsorption treatment in step (2) is 20 min to 30 min.

8. The processing method according to any one of claims 1 to 7, characterized in that: The oxidant for the oxidative degradation treatment in step (3) includes sodium hypochlorite.

9. The processing method according to any one of claims 1 to 8, characterized in that: During the oxidative degradation treatment in step (3), the concentration of the oxidant is 0.1 g / L to 0.3 g / L.

10. The processing method according to any one of claims 1 to 9, characterized in that: The time of the oxidative degradation treatment in step (3) is 4 to 6 hours.

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