Catalytic oxidation method for treating high-concentration organic wastewater

Abstract

The invention belongs to the technical field of catalytic oxidation, and particularly relates to a catalytic oxidation method for high-concentration organic wastewater treatment, which comprises the following specific steps: carrying out primary treatment on wastewater to remove large-particle impurities and organic matters; putting the pretreated wastewater and a catalyst into a reactor together, and carrying out oxidation reaction at high temperature and high pressure to convert harmful substances into harmless substances; carrying out centrifugal operation on the reacted wastewater by utilizing a centrifugal machine to realize solid-liquid separation; and washing the catalyst by using a solvent. After the catalyst is regenerated, a protective layer can be formed on the surface of the catalyst through furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic acid in a solution, so that the catalyst can be prevented from being corroded and worn to a certain extent, and the service life of the catalyst is prolonged. Furthermore, the loss phenomenon of the catalyst can be avoided during wastewater treatment.

Description

Technical Field

[0001] The invention relates to the technical field of catalytic oxidation, in particular to a catalytic oxidation method for treating high-concentration organic wastewater. Background Art

[0002] High-concentration organic wastewater refers to wastewater with a high concentration of organic matter in the sewage. Generally, when the concentration of organic matter exceeds 500 mg / L, it can be defined as high-concentration organic wastewater. This kind of wastewater mainly comes from industries such as petroleum, chemical production, printing and dyeing, dye manufacturing, and papermaking. At present, when treating high-concentration organic wastewater, a catalytic oxidation method is usually used. However, in the existing catalytic oxidation method, although the used catalyst can be regenerated, the service life of the regenerated catalyst is still limited, for example, it may be corroded. Therefore, a catalytic oxidation method for treating high-concentration organic wastewater is invented. Summary of the invention

[0003] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0004] A catalytic oxidation method for treating high-concentration organic wastewater comprises the following specific steps:

[0005] S1, pretreatment: preliminary treatment of wastewater to remove large particle impurities and organic matter;

[0006] S2, reactor: the pretreated wastewater and the catalyst are placed in the reactor to undergo oxidation reaction under high temperature and high pressure to convert harmful substances into harmless substances;

[0007] S3, separation: centrifuge the wastewater after the reaction to achieve solid-liquid separation;

[0008] S4, regeneration: washing the catalyst with a solvent to dissolve impurities on the catalyst surface;

[0009] S5, washing: washing the washed catalyst with a pure solvent to remove the residual solvent;

[0010] S6, drying: drying the washed catalyst;

[0011] S7, soaking: placing the catalyst in a solution to form a protective layer on the surface of the catalyst. After the protective layer solidifies, a protective film will be formed on the surface of the catalyst.

[0012] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater according to the present invention, the specific steps of S1 are as follows:

[0013] S11: Filter particulate impurities and organic matter in wastewater based on sedimentation;

[0014] S12: The wastewater in S11 is filtered for a second time based on the filtering method so as to effectively remove the large particle impurities and organic matter in the wastewater.

[0015] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater according to the present invention, the specific steps of S2 are as follows:

[0016] S21: adjusting the temperature in the reactor to 200° C.-280° C., and further adjusting the pressure in the reactor to 2 MPa-8 MPa;

[0017] S22: placing the oxidant and wastewater in a reactor, and then placing the catalyst in the reactor to utilize the catalytic effect of the catalyst to reduce the activation energy of the reaction, accelerate the reaction between the organic matter in the wastewater and the oxidant, and quickly oxidize the organic matter in the wastewater into CO2, N2, H2O and other easily degradable small molecular organic matter, so as to achieve the purpose of purification.

[0018] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater described in the present invention, the oxidant in S22 is a mixture of one or more of ozone, hydrogen peroxide, potassium permanganate, chlorine dioxide, and potassium ferrate.

[0019] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater described in the present invention, the catalyst in S22 is a mixture of one or more of an ozone catalyst, a heterogeneous silicon-aluminum ozone catalyst, a ceramic ozone catalyst, an aluminum-based ozone catalyst, and a carbon-based ozone catalyst.

[0020] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater described in the present invention, the solvent in S4 is a mixture of one or more of ethanol, hexane, ethylene glycol ether, and propylene glycol ether.

[0021] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater described in the present invention, the pure solvent in S5 is a mixture of one or more of water, glycerol, dimethyl sulfoxide, and polyethylene glycol.

[0022] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater described in the present invention, the drying temperature in S6 is 90°C-100°C, and the drying time is 40min-60min.

[0023] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater described in the present invention, the raw materials of the solution in S7 include, by weight: 4-6 parts of deionized water, 2-6 parts of furan resin, 2-6 parts of vinyl ester resin, 2-6 parts of alkyd resin, 2-6 parts of epoxy resin, 2-6 parts of nylon resin, 2-6 parts of polyurethane, and 2-6 parts of acrylic acid.

[0024] As a preferred embodiment of the catalytic oxidation method for treating high-concentration organic wastewater according to the present invention, the steps for preparing the solution are as follows:

[0025] Step 1: Mix furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic acid;

[0026] Step 2: Deionized water and the mixture in step 2 are placed in a reaction kettle and mixed to obtain a solution.

[0027] Compared with existing technologies:

[0028] By immersing the regenerated catalyst in a solution during catalytic oxidation treatment of high-concentration organic wastewater, after the catalyst is regenerated, a protective layer can be formed on the catalyst surface by the furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic in the solution, so as to avoid corrosion and wear of the catalyst to a certain extent, thereby preventing the loss of the catalyst during wastewater treatment. In addition, it also prevents wastewater from entering the catalyst, thereby preventing the generated water vapor from penetrating into the catalyst during wastewater treatment. Based on the above, the service life of the catalyst can be increased after the catalyst is regenerated. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below.

[0030] Embodiment 1:

[0031] The present invention provides a catalytic oxidation method for treating high-concentration organic wastewater.

[0032] The specific steps are as follows:

[0033] S1, pretreatment: preliminary treatment of wastewater to remove large particle impurities and organic matter;

[0034] Among them, the specific steps of S1 are as follows:

[0035] S11: Filter particulate impurities and organic matter in wastewater based on sedimentation;

[0036] S12: filtering the wastewater in S11 for a second time based on the filtering method, so as to effectively remove large particle impurities and organic matter in the wastewater;

[0037] S2, reactor: the pretreated wastewater and the catalyst are placed in the reactor to undergo oxidation reaction under high temperature and high pressure to convert harmful substances into harmless substances;

[0038] Among them, the specific steps of S2 are as follows:

[0039] S21: adjusting the temperature in the reactor to 200° C., and further adjusting the pressure in the reactor to 2 MPa;

[0040] S22: placing an oxidant and wastewater in a reactor, and then placing a catalyst in the reactor, so as to utilize the catalytic effect of the catalyst to reduce the activation energy of the reaction, accelerate the reaction between the organic matter in the wastewater and the oxidant, and quickly oxidize the organic matter in the wastewater into CO2, N2, H2O and other easily degradable small molecular organic matter, so as to achieve the purpose of purification; wherein the oxidant is a mixture of one or more of ozone, hydrogen peroxide, potassium permanganate, chlorine dioxide, and potassium ferrate; the catalyst is a mixture of one or more of an ozone catalyst, a heterogeneous silicon-aluminum ozone catalyst, a ceramic ozone catalyst, an aluminum-based ozone catalyst, and a carbon-based ozone catalyst;

[0041] S3, separation: centrifuge the wastewater after the reaction to achieve solid-liquid separation;

[0042] S4, regeneration: washing the catalyst with a solvent to dissolve impurities on the catalyst surface; wherein the solvent is a mixture of one or more of ethanol, hexane, ethylene glycol ether, and propylene glycol ether;

[0043] S5, washing: washing the washed catalyst with a pure solvent to remove the residual solvent; wherein the pure solvent is a mixture of one or more of water, glycerol, dimethyl sulfoxide, and polyethylene glycol;

[0044] S6, drying: drying the washed catalyst; wherein the drying temperature is 90°C and the drying time is 40 minutes;

[0045] S7, soaking: placing the catalyst in a solution to form a protective layer on the surface of the catalyst. After the protective layer solidifies, a protective film is formed on the surface of the catalyst;

[0046] The raw materials of the solution include, by weight: 4 parts of deionized water, 2 parts of furan resin, 2 parts of vinyl ester resin, 2 parts of alkyd resin, 2 parts of epoxy resin, 2 parts of nylon resin, 2 parts of polyurethane, and 2 parts of acrylic acid;

[0047] The steps for preparing the solution are as follows:

[0048] Step 1: Mix furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic acid;

[0049] Step 2: Deionized water and the mixture in step 2 are placed in a reaction kettle and mixed to obtain a solution.

[0050] Embodiment 2:

[0051] The present invention provides a catalytic oxidation method for treating high-concentration organic wastewater.

[0052] The specific steps are as follows:

[0053] S1, pretreatment: preliminary treatment of wastewater to remove large particle impurities and organic matter;

[0054] Among them, the specific steps of S1 are as follows:

[0055] S11: Filter particulate impurities and organic matter in wastewater based on sedimentation;

[0056] S12: filtering the wastewater in S11 for a second time based on the filtering method, so as to effectively remove large particle impurities and organic matter in the wastewater;

[0057] S2, reactor: the pretreated wastewater and the catalyst are placed in the reactor to undergo oxidation reaction under high temperature and high pressure to convert harmful substances into harmless substances;

[0058] Among them, the specific steps of S2 are as follows:

[0059] S21: adjusting the temperature in the reactor to 240° C., and further adjusting the pressure in the reactor to 5 MPa;

[0060] S22: placing an oxidant and wastewater in a reactor, and then placing a catalyst in the reactor, so as to utilize the catalytic effect of the catalyst to reduce the activation energy of the reaction, accelerate the reaction between the organic matter in the wastewater and the oxidant, and quickly oxidize the organic matter in the wastewater into CO2, N2, H2O and other easily degradable small molecular organic matter, so as to achieve the purpose of purification; wherein the oxidant is a mixture of one or more of ozone, hydrogen peroxide, potassium permanganate, chlorine dioxide, and potassium ferrate; the catalyst is a mixture of one or more of an ozone catalyst, a heterogeneous silicon-aluminum ozone catalyst, a ceramic ozone catalyst, an aluminum-based ozone catalyst, and a carbon-based ozone catalyst;

[0061] S3, separation: centrifuge the wastewater after the reaction to achieve solid-liquid separation;

[0062] S4, regeneration: washing the catalyst with a solvent to dissolve impurities on the catalyst surface; wherein the solvent is a mixture of one or more of ethanol, hexane, ethylene glycol ether, and propylene glycol ether;

[0063] S5, washing: washing the washed catalyst with a pure solvent to remove the residual solvent; wherein the pure solvent is a mixture of one or more of water, glycerol, dimethyl sulfoxide, and polyethylene glycol;

[0064] S6, drying: drying the washed catalyst; wherein the drying temperature is 95°C and the drying time is 50 minutes;

[0065] S7, soaking: placing the catalyst in a solution to form a protective layer on the surface of the catalyst. After the protective layer solidifies, a protective film is formed on the surface of the catalyst;

[0066] The raw materials of the solution include, by weight: 5 parts of deionized water, 4 parts of furan resin, 4 parts of vinyl ester resin, 4 parts of alkyd resin, 4 parts of epoxy resin, 4 parts of nylon resin, 4 parts of polyurethane, and 4 parts of acrylic acid;

[0067] The steps for preparing the solution are as follows:

[0068] Step 1: Mix furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic acid;

[0069] Step 2: Deionized water and the mixture in step 2 are placed in a reaction kettle and mixed to obtain a solution.

[0070] Embodiment 3:

[0071] The present invention provides a catalytic oxidation method for treating high-concentration organic wastewater.

[0072] The specific steps are as follows:

[0073] S1, pretreatment: preliminary treatment of wastewater to remove large particle impurities and organic matter;

[0074] Among them, the specific steps of S1 are as follows:

[0075] S11: Filter particulate impurities and organic matter in wastewater based on sedimentation;

[0076] S12: filtering the wastewater in S11 for a second time based on the filtering method, so as to effectively remove large particle impurities and organic matter in the wastewater;

[0077] S2, reactor: the pretreated wastewater and the catalyst are placed in the reactor to undergo oxidation reaction under high temperature and high pressure to convert harmful substances into harmless substances;

[0078] Among them, the specific steps of S2 are as follows:

[0079] S21: adjusting the temperature in the reactor to 280° C., and further adjusting the pressure in the reactor to 8 MPa;

[0080] S22: placing an oxidant and wastewater in a reactor, and then placing a catalyst in the reactor, so as to utilize the catalytic effect of the catalyst to reduce the activation energy of the reaction, accelerate the reaction between the organic matter in the wastewater and the oxidant, and quickly oxidize the organic matter in the wastewater into CO2, N2, H2O and other easily degradable small molecular organic matter, so as to achieve the purpose of purification; wherein the oxidant is a mixture of one or more of ozone, hydrogen peroxide, potassium permanganate, chlorine dioxide, and potassium ferrate; the catalyst is a mixture of one or more of an ozone catalyst, a heterogeneous silicon-aluminum ozone catalyst, a ceramic ozone catalyst, an aluminum-based ozone catalyst, and a carbon-based ozone catalyst;

[0081] S3, separation: centrifuge the wastewater after the reaction to achieve solid-liquid separation;

[0082] S4, regeneration: washing the catalyst with a solvent to dissolve impurities on the catalyst surface; wherein the solvent is a mixture of one or more of ethanol, hexane, ethylene glycol ether, and propylene glycol ether;

[0083] S5, washing: washing the washed catalyst with a pure solvent to remove the residual solvent; wherein the pure solvent is a mixture of one or more of water, glycerol, dimethyl sulfoxide, and polyethylene glycol;

[0084] S6, drying: drying the washed catalyst; wherein the drying temperature is 100° C. and the drying time is 60 min;

[0085] S7, soaking: placing the catalyst in a solution to form a protective layer on the surface of the catalyst. After the protective layer solidifies, a protective film is formed on the surface of the catalyst;

[0086] The raw materials of the solution include, by weight: 6 parts of deionized water, 6 parts of furan resin, 6 parts of vinyl ester resin, 6 parts of alkyd resin, 6 parts of epoxy resin, 6 parts of nylon resin, 6 parts of polyurethane, and 6 parts of acrylic acid;

[0087] The steps for preparing the solution are as follows:

[0088] Step 1: Mix furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic acid;

[0089] Step 2: Deionized water and the mixture in step 2 are placed in a reaction kettle and mixed to obtain a solution.

[0090] The catalytic oxidation methods used in the above Examples 1-3 are compared to obtain the following data:

[0091] Example 1 Example 2 Example 3 Wear resistance coefficient 90g / CM 90g / CM 90g / CM Corrosion resistance grade Sa2 Sa2.5 Sa2 Waterproof grade IPX8 IPX8 IPX8

[0092] It can be seen from the above table that after use, Example 2 has the best effect.

[0093] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A catalytic oxidation method for treating high-concentration organic wastewater, characterized in that: The specific steps are as follows: S1, pretreatment: preliminary treatment of wastewater to remove large particle impurities and organic matter; S2, reactor: the pretreated wastewater and the catalyst are placed in the reactor to undergo oxidation reaction under high temperature and high pressure to convert harmful substances into harmless substances; S3, separation: centrifuge the wastewater after the reaction to achieve solid-liquid separation; S4, regeneration: washing the catalyst with a solvent to dissolve impurities on the catalyst surface; S5, washing: washing the washed catalyst with a pure solvent to remove the residual solvent; S6, drying: drying the washed catalyst; S7, soaking: placing the catalyst in a solution to form a protective layer on the surface of the catalyst. After the protective layer solidifies, a protective film will be formed on the surface of the catalyst.

2. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 1, characterized in that: The specific steps of S1 are as follows: S11: Filter particulate impurities and organic matter in wastewater based on sedimentation; S12: The wastewater in S11 is filtered for a second time based on the filtering method so as to effectively remove the large particle impurities and organic matter in the wastewater.

3. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 1, characterized in that: The specific steps of S2 are as follows: S21: adjusting the temperature in the reactor to 200° C.-280° C., and further adjusting the pressure in the reactor to 2 MPa-8 MPa; S22: placing the oxidant and wastewater in a reactor, and then placing the catalyst in the reactor to utilize the catalytic effect of the catalyst to reduce the activation energy of the reaction, accelerate the reaction between the organic matter in the wastewater and the oxidant, and quickly oxidize the organic matter in the wastewater into CO2, N2, H2O and other easily degradable small molecular organic matter, so as to achieve the purpose of purification.

4. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 3, characterized in that: The oxidant in S22 is a mixture of one or more of ozone, hydrogen peroxide, potassium permanganate, chlorine dioxide, and potassium ferrate.

5. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 3, characterized in that: The catalyst in S22 is a mixture of one or more of an ozone catalyst, a heterogeneous silicon-aluminum ozone catalyst, a ceramic ozone catalyst, an aluminum-based ozone catalyst, and a carbon-based ozone catalyst.

6. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 1, characterized in that: The solvent in S4 is a mixture of one or more of ethanol, hexane, ethylene glycol ether, and propylene glycol ether.

7. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 1, characterized in that: The pure solvent in S5 is a mixture of one or more of water, glycerol, dimethyl sulfoxide and polyethylene glycol.

8. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 1, characterized in that: The drying temperature in S6 is 90° C.-100° C., and the drying time is 40 min-60 min.

9. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 1, characterized in that: The raw materials of the solution in S7 include, by weight: 4-6 parts of deionized water, 2-6 parts of furan resin, 2-6 parts of vinyl ester resin, 2-6 parts of alkyd resin, 2-6 parts of epoxy resin, 2-6 parts of nylon resin, 2-6 parts of polyurethane, and 2-6 parts of acrylic acid.

10. The catalytic oxidation method for treating high-concentration organic wastewater according to claim 9, characterized in that: The preparation steps of the solution are as follows: Step 1: Mix furan resin, vinyl ester resin, alkyd resin, epoxy resin, nylon resin, polyurethane and acrylic acid; Step 2: Deionized water and the mixture in step 2 are placed in a reaction kettle and mixed to obtain a solution.