Method and system for treating dimethyl sulfoxide wastewater

Abstract

The invention relates to the technical field of water treatment, in particular to a method and a system for treating dimethyl sulfoxide wastewater. The invention provides a method for treating dimethyl sulfoxide wastewater, which is characterized in that dimethyl sulfoxide can be fully oxidized by hydrogen peroxide and ozone in a closed container under the action of a catalyst by controlling the condition of high temperature (55-65 DEG C) and the molar ratio of each raw material, and the effect of removing more than 99.9% of DMSO in the dimethyl sulfoxide wastewater is realized. The invention also provides a dimethyl sulfoxide wastewater treatment system, which is high in intelligence and automation degree, can be actively adjusted according to emergencies, and is small in occupied area.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a method and system for treating dimethyl sulfoxide wastewater. Background Art

[0002] Dimethyl sulfoxide (DMSO) wastewater is an organic wastewater produced in the production of dimethyl sulfoxide. In addition to DMSO, it also contains pollutants such as methanol and dimethyl sulfide. The COD of DMSO wastewater is generally between 3000 and 20000 mg / L, and the BOD is within 10 mg / L. It has poor biodegradability and is difficult to be directly treated by conventional biological methods.

[0003] Existing DSMO removal processes are mostly chemical treatments (such as Fenton, ozone oxidation) or chemical + biochemical combined treatments (such as "Fenton oxidation + A / O + MBR" process), which have problems such as incomplete treatment effects and low removal rates. The removal rate of DSMO is generally around 70%. Summary of the invention

[0004] The object of the present invention is to provide a method and system for treating dimethyl sulfoxide wastewater, which can achieve efficient removal of dimethyl sulfoxide.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for treating dimethyl sulfoxide wastewater, comprising the following steps:

[0007] The pH value of the dimethyl sulfoxide wastewater is adjusted to 3-4 with an acid to obtain acidic wastewater;

[0008] Process ozone into micro-nano form to obtain micro-nano bubbles;

[0009] The acidic wastewater, hydrogen peroxide, micro-nano bubbles and a catalyst are mixed and subjected to oxidation reaction under a closed condition of 55 to 65° C. to obtain treated wastewater;

[0010] The molar ratio of dimethyl sulfoxide, hydrogen peroxide and ozone in the acidic wastewater is 1:(2.0-3.0):(1.5-2.5).

[0011] Preferably, the acid comprises one or more of nitric acid, sulfuric acid and hydrochloric acid.

[0012] Preferably, the oxidation reaction time is 0.5 to 6 hours.

[0013] The present invention provides a system for implementing the treatment method described in the above scheme, including a water distribution system, a reaction system, a material supply system and an engineering digital information scheduling service system;

[0014] The water distribution system includes a first pH meter 13, a water distributor 15, a regulating tank 17 and an acid storage tank 18; the outlet of the acid storage tank 18 is connected to the inlet of the regulating tank 17; the first pH meter 13 is arranged in the regulating tank 17;

[0015] The reaction system includes a double-effect reaction tank 21, a second thermometer 22 and a heating rod 26, wherein the second thermometer 22 and the heating rod 26 are arranged in the double-effect reaction tank 21; the water distributor 15 is arranged at the bottom of the double-effect reaction tank 21, and is used to pass the wastewater in the regulating tank 17 into the double-effect reaction tank 21;

[0016] The feeding system includes a hydrogen peroxide storage tank 31, an ozone generator 33 and a micro-nano bubble generator 34; the outlet of the hydrogen peroxide storage tank 31 is connected to the first inlet of the double-effect reaction tank 21; the outlet of the ozone generator 33 is connected to the inlet of the micro-nano bubble generator 34, and the outlet of the micro-nano bubble generator 34 is connected to the second inlet of the double-effect reaction tank 21;

[0017] The engineering digital information dispatching service system controls each system through a DCS control system.

[0018] Preferably, a drainage system is further included; the drainage system includes a drainage tank 51 ; the water outlet of the double-effect reaction tank 21 is connected to the water inlet of the drainage tank 51 .

[0019] Preferably, a reflux pipeline is provided between the drainage tank 51 and the regulating tank 17 , and a reflux pump 52 , a second flow meter 53 and a reflux automatic control valve 55 are provided on the reflux pipeline.

[0020] Preferably, the drainage system further comprises a second pH meter 54 , an alkali storage tank 56 and an alkali adding pump 57 , and the alkali storage tank 56 , the alkali adding pump 57 and the drainage tank 51 are connected in sequence; and the second pH meter 54 is disposed in the drainage tank 51 .

[0021] Preferably, the reaction system further comprises an ozone destroyer 25; the ozone destroyer 25 is arranged on the top of the double-effect reaction tank 21;

[0022] The reaction system further includes a third pH meter 23 and a COD rapid detector 24 ; the third pH meter 23 and the COD rapid detector 24 are disposed in the double-effect reaction tank 21 .

[0023] Preferably, a first flow meter 12, a sewage lifting pump 11 and a water inlet automatic control valve 16 are sequentially provided on the pipeline between the water outlet of the regulating tank 17 and the inlet of the water distributor 15; a first thermometer 14 is also provided in the regulating tank 17;

[0024] An acid adding pump 19 is provided on the pipeline between the outlet of the acid storage tank 18 and the acid inlet of the regulating tank 17 .

[0025] Preferably, the feeding system further comprises a hydrogen peroxide feeding pump 32 and a hydrogen peroxide feeding automatic control valve 35 , and the hydrogen peroxide feeding pump 32 and the hydrogen peroxide feeding automatic control valve 35 are located on the pipeline between the outlet of the hydrogen peroxide storage tank 31 and the first inlet of the double-effect reaction tank 21 .

[0026] The invention provides a method for treating dimethyl sulfoxide wastewater. Hydrogen peroxide and ozone are used in a closed container under the action of a catalyst. By controlling the high temperature (55-65° C.) and the molar ratio of each raw material, dimethyl sulfoxide can be fully oxidized to achieve a removal effect of more than 99.9% of DMSO in dimethyl sulfoxide wastewater.

[0027] In addition, the present invention has the advantage of high utilization rate of ozone and hydrogen peroxide by reasonably controlling the pH value of wastewater and reaction conditions, and the utilization rate of ozone and hydrogen peroxide can reach more than 90% (the utilization rate is calculated by the ratio of the dosage of the reagent entering and leaving the double-effect reaction tank to the residual amount of the reagent, and the high utilization rate is reflected by the low residual reagent content and the low target pollutant content).

[0028] The present invention does not need to add consumable catalysts, only needs to add a fixed amount of catalysts, and does not need to be added continuously at a later stage.

[0029] Furthermore, compared with the Fenton process which requires the addition of iron salts (or other Fe-based chemicals), a large amount of iron hydroxide (such as Fe(OH)3) sludge will be produced during the reaction. Most of this sludge needs to be treated and disposed of in accordance with the standards for hazardous waste, which not only increases additional costs but may also cause secondary pollution to the environment. The present invention does not produce any type of sludge and is environmentally friendly.

[0030] Compared with the chemical + biochemical combined treatment, the treatment method of the present invention is also simpler.

[0031] The present invention also provides a dimethyl sulfoxide wastewater treatment system, which has a high degree of intelligence and automation, can be actively adjusted according to emergencies, and occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the treatment system of dimethyl sulfoxide wastewater in the embodiment;

[0033] Among them: 11-sewage lifting pump, 12-first flow meter, 13-first pH meter, 14-first thermometer, 15-water distributor, 16-water inlet automatic control valve, 17-regulating tank, 18-acid storage tank, 19-acid adding pump; 21-double-effect reaction tank, 22-second thermometer, 23-third pH meter, 24-COD rapid detector, 25-ozone destroyer, 26-heating rod, 27-double-effect catalytic catalyst; 31-hydrogen peroxide storage tank, 32-hydrogen peroxide feed pump, 33-ozone generator, 34-micro-nano bubble generator, 35-hydrogen peroxide feed automatic control valve; 51-drainage tank, 52-reflux pump, 53-second flow meter, 54-second pH meter, 55-reflux automatic control valve, 56-alkali storage tank, 57-alkali adding pump. DETAILED DESCRIPTION

[0034] The present invention provides a method for treating dimethyl sulfoxide wastewater, comprising the following steps:

[0035] The pH value of the dimethyl sulfoxide wastewater is adjusted to 3-4 with an acid to obtain acidic wastewater;

[0036] Process ozone into micro-nano form to obtain micro-nano bubbles;

[0037] The acidic wastewater, hydrogen peroxide, micro-nano bubbles and a catalyst are mixed, and an oxidation reaction is carried out under a closed condition of 55 to 65° C. to obtain treated wastewater.

[0038] The molar ratio of dimethyl sulfoxide, hydrogen peroxide and ozone in the acidic wastewater is 1:(2.0-3.0):(1.5-2.5).

[0039] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0040] The invention uses acid to adjust the pH value of dimethyl sulfoxide waste water to 3-4 to obtain acidic waste water.

[0041] The present invention has no special requirements for the dimethyl sulfoxide wastewater, and any dimethyl sulfoxide wastewater known in the art can be used. In an embodiment of the present invention, the dimethyl sulfoxide wastewater is a chemical production wastewater in Ningxia Hui Autonomous Region, with a DMSO content of 3860 mg / L and a COD content of 5100 mg / L, or a pharmaceutical intermediate wastewater in Gansu, with a DMSO content of 5320 mg / L and a COD content of 7800 mg / L.

[0042] In the present invention, the acid preferably includes one or more of nitric acid, sulfuric acid and hydrochloric acid. The present invention has no special requirements on the concentration and dosage of the acid, and the pH value of the dimethyl sulfoxide wastewater can be adjusted to 3 to 4. In a specific embodiment, the pH value of the dimethyl sulfoxide wastewater can be adjusted to 3, 3.3, 3.6 or 4. The present invention adjusts the pH value of the dimethyl sulfoxide wastewater to 3 to 4, which is conducive to promoting the oxidation reaction.

[0043] The present invention performs micro-nano processing on ozone to obtain micro-nano bubbles.

[0044] In the present invention, the ozone is preferably generated by an ozone generator. The present invention has no special requirements for the micro-nano treatment, and the ozone can be directly introduced into the micro-nano bubble generator. The present invention can form micro-nano-level fine bubbles by micro-nano treatment of ozone, wrapping the ozone molecules inside, increasing the contact time and area of ​​the ozone and the added strong oxidant (hydrogen peroxide) with the DMSO in the sewage, thereby improving the treatment efficiency.

[0045] After obtaining the acidic wastewater and micro-nano bubbles, the present invention mixes the acidic wastewater, hydrogen peroxide, micro-nano bubbles and a catalyst, and performs an oxidation reaction under a closed condition of 55 to 65° C. to obtain treated wastewater.

[0046] In the present invention, the molar ratio of dimethyl sulfoxide, hydrogen peroxide and ozone in the acidic wastewater is 1:(2.0-3.0):(1.5-2.5), and in specific embodiments, it can be 1:2.0:1.5, 1:2.0:2.0, 1:2.0:2.5, 1:2.5:1.5 or 1:3.0:1.5. The present invention has no special requirements for the concentration of the hydrogen peroxide. In the embodiment of the present invention, the mass concentration of the hydrogen peroxide is 30%.

[0047] In the present invention, the catalyst is preferably a dual-effect catalyst, which can catalyze ozone and hydrogen peroxide at the same time. In the present invention, the dual-effect catalyst is a solid molded product, with high-strength carbon as a carrier, four metal oxides of cobalt, copper, iron and manganese and rare earth metals as catalytic components, and has good catalytic performance for hydrogen peroxide and ozone at the same time. In an embodiment of the present invention, the dual-effect catalyst uses commercially available products, specifically RH-SX01 or RH-SX07 purchased from Shandong Ruihai Environmental Technology Co., Ltd.

[0048] In the present invention, the amount of the catalyst used is determined according to the oxidation reactor, and the loading amount is preferably 70-90% of the effective volume of the oxidation reactor.

[0049] In the present invention, the oxidation reaction time is 55-65° C., and in a specific embodiment, the oxidation reaction time can be 55° C., 58° C., 60° C., 62° C. or 65° C. In the present invention, the oxidation reaction time is preferably 0.5-6 hours, and in a specific embodiment, the oxidation reaction time can be 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours or 6 hours.

[0050] In the present invention, the hydrogen peroxide and ozone are used as oxidants, and under the action of a catalyst in a closed container, by controlling the high temperature (55-65° C.) and the molar ratio of each raw material, dimethyl sulfoxide can be fully oxidized to achieve a removal effect of more than 99.9% of DMSO in dimethyl sulfoxide wastewater.

[0051] The specific reaction equation is as follows:

[0052] (CH3)2SO+H2O2→(CH3)2SO2+H2O;

[0053] (CH3)2SO+O3→(CH3)2SO2+O2.

[0054] After the oxidation reaction is completed, the present invention preferably adjusts the pH value of the treated wastewater to 6-9 and directly discharges it into the biological system or sewage network.

[0055] The present invention provides a system for implementing the treatment method described in the above scheme, including a water distribution system, a reaction system, a material supply system, and an engineering digital information scheduling service system;

[0056] The water distribution system includes a first pH meter 13, a water distributor 15, a regulating tank 17 and an acid storage tank 18; the outlet of the acid storage tank 18 is connected to the inlet of the regulating tank 17; the first pH meter 13 is arranged in the regulating tank 17;

[0057] The reaction system includes a double-effect reaction tank 21, a second thermometer 22 and a heating rod 26, wherein the second thermometer 22 and the heating rod 26 are arranged in the double-effect reaction tank 21; the water distributor 15 is arranged at the bottom of the double-effect reaction tank 21, and is used to pass the wastewater in the regulating tank 17 into the double-effect reaction tank 21;

[0058] The feeding system includes a hydrogen peroxide storage tank 31, an ozone generator 33 and a micro-nano bubble generator 34; the outlet of the hydrogen peroxide storage tank 31 is connected to the first inlet of the double-effect reaction tank 21; the outlet of the ozone generator 33 is connected to the inlet of the micro-nano bubble generator 34, and the outlet of the micro-nano bubble generator 34 is connected to the second inlet of the double-effect reaction tank 21;

[0059] The engineering digital information dispatching service system controls each system through a DCS control system.

[0060] Combine the following Figure 1 Provide explanation.

[0061] like Figure 1 As shown, the system provided by the present invention includes a water distribution system; the water distribution system includes a first pH meter 13, a water distributor 15, an adjusting tank 17 and an acid storage tank 18; the outlet of the acid storage tank 18 is connected to the inlet of the adjusting tank 17; the first pH meter 13 is arranged in the adjusting tank 17.

[0062] In the present invention, the regulating tank 17 is used to contain dimethyl sulfoxide wastewater and adjust the pH value to 3-4 in the regulating tank 17; the first pH meter 13 is used to monitor the pH value in real time; and the acid storage tank 18 is used to store the acid used to adjust the pH value.

[0063] In the present invention, the regulating tank 17 is provided with a water inlet, an acid inlet, a reflux inlet and a water outlet; the water inlet and the acid inlet are located at the top of the regulating tank 17, the reflux inlet is located at the bottom of the side wall of the regulating tank 17, and the water outlet is located at the center of the side wall of the regulating tank 17.

[0064] As an embodiment of the present invention, a first thermometer 14 is further provided in the regulating tank 17 for recording the real-time temperature.

[0065] As an embodiment of the present invention, a first flow meter 12, a sewage lifting pump 11 and a water inlet automatic control valve 16 are sequentially provided on the pipeline between the water outlet of the regulating tank 17 and the inlet of the water distributor 15.

[0066] The sewage is pumped into the double-effect reaction tank 21 from the water distributor 15 at the bottom of the double-effect reaction tank through the sewage lifting pump 11, and the real-time flow rate is recorded by the first flow meter 12 installed on the pipeline. The water is evenly introduced from the water distributor 15 at the bottom of the double-effect reaction tank 21 through swirl water distribution, and the water inlet is accurately controlled by the water inlet automatic control valve 16.

[0067] As an embodiment of the present invention, an acid adding pump 19 is provided on the pipeline between the outlet of the acid storage tank 18 and the acid inlet of the regulating tank 17 .

[0068] The system provided by the present invention includes a reaction system; the reaction system includes a double-effect reaction tank 21, a second thermometer 22 and a heating rod 26, wherein the second thermometer 22 and the heating rod 26 are arranged in the double-effect reaction tank 21; the water distributor 15 is arranged at the bottom of the double-effect reaction tank 21, and is used to pass the wastewater in the regulating tank 17 into the double-effect reaction tank 21. In the present invention, the double-effect reaction tank 21 is provided with a first inlet and a second inlet, wherein the first inlet is used as a hydrogen peroxide feed port, and the second inlet is used as a micro-nano bubble feed port, and the first inlet and the second inlet are located on the side wall of the double-effect reaction tank 21, 0.5 to 1.0 m above the bottom water distributor 15. In an embodiment, the double-effect reaction tank 21 is also provided with a water outlet, and the water outlet is arranged at the upper part of the side wall of the double-effect reaction tank 21.

[0069] As an embodiment of the present invention, the reaction system further includes a third pH meter 23 and a COD rapid detector 24; the third pH meter 23 and the COD rapid detector 24 are arranged in the double-effect reaction tank 21 for real-time monitoring of the reaction state in the double-effect reaction tank 21.

[0070] As an embodiment of the present invention, the reaction system further includes an ozone destroyer 25; the ozone destroyer 25 is arranged on the top of the double-effect reaction tank 21. The ozone destroyer 25 is used to destroy the remaining ozone to avoid pollution to the environment.

[0071] In the present invention, when the system is in operation, a catalyst 27 is placed in the double-effect reaction tank 21 in advance.

[0072] The system provided by the present invention includes a feeding system; the feeding system includes a hydrogen peroxide storage tank 31, an ozone generator 33 and a micro-nano bubble generator 34; the outlet of the hydrogen peroxide storage tank 31 is connected to the first inlet of the double-effect reaction tank 21; the outlet of the ozone generator 33 is connected to the inlet of the micro-nano bubble generator 34, and the outlet of the micro-nano bubble generator 34 is connected to the second inlet of the double-effect reaction tank 21.

[0073] As an embodiment of the present invention, the feeding system further comprises a hydrogen peroxide feeding pump 32 and a hydrogen peroxide feeding automatic control valve 35, and the hydrogen peroxide feeding pump 32 and the hydrogen peroxide feeding automatic control valve 35 are located on the pipeline between the outlet of the hydrogen peroxide storage tank 31 and the first inlet of the double-effect reaction tank 21. The present invention realizes precise control of hydrogen peroxide feeding through the hydrogen peroxide feeding automatic control valve 35.

[0074] The system provided by the present invention includes an engineering digital information dispatching service system; the engineering digital information dispatching service system controls each system through a DCS control system. In a specific embodiment, the engineering digital information dispatching service system is an MQ-engineering digital information dispatching service system; the system effectively faces various emergencies through a huge cloud database. When the water quality changes, the monitoring data changes accordingly. The intelligent control system will obtain data in real time, and will provide simulated adjustment data for the control conditions such as water volume and dosage of the operating system based on the changed data and data with a changing trend. When the warning value is reached, it will automatically adjust, which can realize unmanned and intelligent control, and record the adjustment results and save them automatically.

[0075] In a specific embodiment, the system provided by the present invention further includes a drainage system; the drainage system includes a drainage tank 51; the water outlet of the double-effect reaction tank 21 is connected to the water inlet of the drainage tank 51. In the present invention, the water inlet of the drainage tank 51 is arranged at the top of the drainage tank 51. As an embodiment of the present invention, the drainage tank 51 is also provided with a reflux outlet, an alkali solution inlet and a drainage outlet.

[0076] As an embodiment of the present invention, the drainage system further includes a second pH meter 54, an alkali storage tank 56 and an alkali pump 57, wherein the alkali storage tank 56, the alkali pump 57 and the drainage tank 51 are connected in sequence; the second pH meter 54 is arranged in the drainage tank 51. In the present invention, the alkali pump 57 is connected to the alkali liquid inlet of the drainage tank 51, and the alkali liquid inlet is located at the lower part of the side wall of the drainage tank 51.

[0077] The standard pH value of sewage introduced into the industrial park is generally 6-9. The present invention injects alkali solution into the drainage tank 51 through the alkali storage tank 56 and the alkali pump 57 to adjust the pH value to 6-9.

[0078] As an embodiment of the present invention, a reflux pipeline is provided between the drainage tank 51 and the regulating tank 17 , and a reflux pump 52 , a second flow meter 53 and a reflux automatic control valve 55 are provided on the reflux pipeline.

[0079] When the wastewater in the drainage tank 51 is unqualified, the present invention uses a reflux pump 52 to pump the wastewater in the drainage tank 51 back to the regulating tank 17 for further treatment until it is qualified. The present invention uses a reflux automatic control valve 55 to accurately control the reflux amount.

[0080] The system provided by the present invention, when used for treating dimethyl sulfoxide wastewater, comprises the following steps:

[0081] The dimethyl sulfoxide wastewater is placed in a regulating tank 17, and the acid in the acid storage tank 18 is passed into the regulating tank 17 to adjust the pH value of the dimethyl sulfoxide wastewater to 3-4, thereby obtaining acidic wastewater;

[0082] The double-effect reaction tank 21 is heated by a heating rod 26 to maintain a temperature of 55 to 65° C., and is monitored in real time by a second thermometer 22; the acidic wastewater is introduced into the double-effect reaction tank 21 through a water distributor 15, and at the same time, the hydrogen peroxide in the hydrogen peroxide storage tank 31 and the ozone generated by the ozone generator 33 are processed by the micro-nano bubble generator 34 to form micro-nano bubbles into the double-effect reaction tank 21, a catalyst 27 is placed in the double-effect reaction tank 21 in advance, and an oxidation reaction occurs in the double-effect reaction tank 21 to obtain treated wastewater;

[0083] The engineering digital information dispatching service system is used to intelligently control the feed molar ratio of the acidic wastewater, hydrogen peroxide and ozone to be 1:(2.0-3.0):(1.5-2.5); the mass concentration of the hydrogen peroxide is 30%;

[0084] The treated wastewater is discharged into the drainage tank 51 for temporary storage.

[0085] In the present invention, the loading amount of the catalyst is preferably 70% to 90% of the effective volume of the double-effect reaction tank 21. In a specific embodiment, it can be 70%, 75%, 80%, 85% or 90%.

[0086] The following is a detailed description of the method and system for treating dimethyl sulfoxide wastewater provided by the present invention in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0087] Example 1

[0088] The wastewater from a chemical production in Ningxia Hui Autonomous Region has a DMSO content of 3860 mg / L and a COD of 5100 mg / L. Hydrochloric acid is added to adjust the pH value of the wastewater in the regulating tank 17 to 3.6. The wastewater is pumped into the double-effect reaction tank 21 through the sewage lifting pump 11. The temperature in the double-effect reaction tank 21 is 61°C. The catalyst is RH-SX01 with a filling volume of 6.5m 3 (81.25% of the effective volume of the double-effect reactor), water inlet volume 150m 3 / d, dosage: 2.7m 3 / d, ozone dosage 80mg / L, DMSO, hydrogen peroxide and ozone molar ratio of 1:2.1:2.1, reaction time 1.25h, after treatment by this system equipment, DMSO content is 9.7mg / L, COD: 365mg / L, DMSO removal rate is 99.75%, COD removal rate is 92.84%, after adjusting pH value to 6.8 with alkali solution, it is directly discharged into the industrial zone sewage network, and the treatment cost is 21.7 yuan / m 3 .

[0089] Example 2

[0090] The wastewater of a pharmaceutical intermediate in Gansu has a DMSO content of 5320 mg / L and a COD of 7800 mg / L. Hydrochloric acid is added to adjust the pH value of the wastewater in the regulating tank 17 to 3.5. The wastewater is pumped into the double-effect reaction tank 21 through the sewage lifting pump 11. The temperature in the double-effect reaction tank 21 is 60°C. The catalyst is RH-SX01 and the filling volume is 7m 3 (87.5% of the effective solvent in the double-effect reaction tank), the water inlet volume is 100m 3 / d., dosage: 3.5m 3 / d, ozone dosage 125mg / L, DMSO, hydrogen peroxide and ozone molar ratio of 1:2.1:2.8, reaction time 2.0h, after treatment by this system, DMSO content is 3.2mg / L, COD: 1205mg / L, DMSO removal rate is 99.94%, COD removal rate is 84.55%. After adjusting the pH value to 7.0 with alkali solution, it is discharged into the biochemical system as the carbon source required by the biochemical system. The treatment cost is 15.4 yuan / m 3 The original treatment cost (traditional Fenton oxidation + activated sludge method) is 21 to 25 yuan / m3.

[0091] Example 3

[0092] The sewage in Shandong has a DMSO content of 2960 mg / L and a COD of 3820 mg / L. Hydrochloric acid is added to adjust the pH value of the wastewater in the regulating tank 17 to 3.9. The wastewater is pumped into the double-effect reaction tank 21 through the sewage lifting pump 11. The temperature in the double-effect reaction tank 21 is 60°C. The catalyst is RH-SX07 and the filling volume is 11.5m 3 (76.7% of the effective solvent in the double-effect reaction tank), the water inlet volume is 6m 3 / h, dosage of hydrogen peroxide 1.4m 3 / d, ozone dosage 80mg / L, DMSO, hydrogen peroxide and ozone molar ratio of 1:2.1:1.9, reaction time 2.5h, after treatment by this system equipment, DMSO content is 12.2mg / L, COD: 205mg / L, DMSO removal rate is 99.59%, COD removal rate is 94.63%, after adjusting pH value to 7.0 with alkali solution, discharged into the biochemical system, treatment cost is 26.1 yuan / m 3 .

[0093] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for treating dimethyl sulfoxide wastewater, characterized in that: The following steps are involved: The pH value of the dimethyl sulfoxide wastewater is adjusted to 3-4 with an acid to obtain acidic wastewater; Process ozone into micro-nano form to obtain micro-nano bubbles; The acidic wastewater, hydrogen peroxide, micro-nano bubbles and a catalyst are mixed and subjected to oxidation reaction under a closed condition of 55 to 65° C. to obtain treated wastewater; The molar ratio of dimethyl sulfoxide, hydrogen peroxide and ozone in the acidic wastewater is 1:(2.0-3.0):(1.5-2.5).

2. The processing method according to claim 1, characterized in that: The acid includes one or more of nitric acid, sulfuric acid and hydrochloric acid.

3. The processing method according to claim 1 or 2, characterized in that: The oxidation reaction time is 0.5 to 6 hours.

4. A system for implementing the treatment method according to any one of claims 1 to 3, characterized in that: Including water distribution system, reaction system, material supply system and engineering digital information dispatch service system; The water distribution system comprises a first pH meter (13), a water distributor (15), a regulating tank (17) and an acid storage tank (18); the outlet of the acid storage tank (18) is connected to the inlet of the regulating tank (17); the first pH meter (13) is arranged in the regulating tank (17); The reaction system comprises a double-effect reaction tank (21), a second thermometer (22) and a heating rod (26), wherein the second thermometer (22) and the heating rod (26) are arranged in the double-effect reaction tank (21); the water distributor (15) is arranged at the bottom of the double-effect reaction tank (21) and is used to pass the wastewater in the regulating tank (17) into the double-effect reaction tank (21); The feeding system comprises a hydrogen peroxide storage tank (31), an ozone generator (33) and a micro-nano bubble generator (34); the outlet of the hydrogen peroxide storage tank (31) is communicated with a first inlet of the double-effect reaction tank (21); the outlet of the ozone generator (33) is communicated with an inlet of the micro-nano bubble generator (34), and the outlet of the micro-nano bubble generator (34) is communicated with a second inlet of the double-effect reaction tank (21); The engineering digital information dispatching service system controls each system through a DCS control system.

5. The system according to claim 4, characterized in that It also includes a drainage system; the drainage system includes a drainage tank (51); the water outlet of the double-effect reaction tank (21) is connected to the water inlet of the drainage tank (51).

6. The system according to claim 5, characterized in that A reflux pipeline is provided between the drainage tank (51) and the regulating tank (17), and a reflux pump (52), a second flow meter (53) and a reflux automatic control valve (55) are provided on the reflux pipeline.

7. The system according to claim 5 or 6, characterized in that: The drainage system further comprises a second pH meter (54), an alkali storage tank (56) and an alkali adding pump (57); the alkali storage tank (56), the alkali adding pump (57) and the drainage tank (51) are connected in sequence; and the second pH meter (54) is arranged in the drainage tank (51).

8. The system according to claim 4, characterized in that The reaction system further comprises an ozone destroyer (25); the ozone destroyer (25) is arranged on the top of the double-effect reaction tank (21); The reaction system further comprises a third pH meter (23) and a COD rapid detector (24); the third pH meter (23) and the COD rapid detector (24) are arranged in the double-effect reaction tank (21).

9. The processing system according to claim 4, characterized in that A first flow meter (12), a sewage lifting pump (11) and a water inlet automatic control valve (16) are sequentially arranged on the pipeline between the water outlet of the regulating tank (17) and the inlet of the water distributor (15); a first thermometer (14) is also arranged in the regulating tank (17); An acid adding pump (19) is provided on the pipeline between the outlet of the acid storage tank (18) and the acid inlet of the regulating tank (17).

10. The system according to claim 4, characterized in that The feeding system further comprises a hydrogen peroxide feeding pump (32) and a hydrogen peroxide feeding automatic control valve (35), wherein the hydrogen peroxide feeding pump (32) and the hydrogen peroxide feeding automatic control valve (35) are located on a pipeline between an outlet of the hydrogen peroxide storage tank (31) and a first inlet of the double-effect reaction tank (21).

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