CN112979010A - Microwave high-field advanced oxidation reaction treatment method for organic wastewater - Google Patents
Microwave high-field advanced oxidation reaction treatment method for organic wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 106
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011282 treatment Methods 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 92
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 239000013043 chemical agent Substances 0.000 claims abstract description 26
- 238000002360 preparation method Methods 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 239000003814 drug Substances 0.000 claims description 21
- 230000000694 effects Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 230000005684 electric field Effects 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 3
- 238000003487 electrochemical reaction Methods 0.000 abstract description 5
- 239000010865 sewage Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 238000001816 cooling Methods 0.000 description 7
- 239000010815 organic waste Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 238000009279 wet oxidation reaction Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
- 238000009284 supercritical water oxidation Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/302—Treatment of water, waste water, or sewage by irradiation with microwaves
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
Abstract
The invention relates to a microwave strong field advanced oxidation reaction treatment method for organic wastewater, which belongs to the technical field of sewage treatment, wherein the organic wastewater and a chemical agent are mixed in a liquid preparation tank and flow into a microwave reaction unit, organic matters in the organic wastewater are oxidized and decomposed by the chemical agent under the action of a microwave strong field, the reacted organic wastewater flows into a temperature control tank, the temperature of the organic wastewater is reduced to below 60 ℃ by the temperature control tank, the safety is improved, meanwhile, the organic wastewater flows back to the liquid preparation tank through the temperature control tank and is repeatedly circulated until the organic wastewater reaches the discharge standard, the invention establishes the electrochemical reaction electrolytic voltage of most of electrolytic substances in the organic wastewater through microwaves, simultaneously realizes advanced chemical oxidation of the organic matters which are difficult to biochemically degrade under the normal temperature and pressure condition, degrades the organic matters under the mild condition, and combines the microwave resonant cavity with chemical reaction, replaces the harsh conditions required by the conventional advanced oxidation, and is easy to realize and popularize on a large scale.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a microwave strong field advanced oxidation reaction treatment method for organic wastewater.
Background
The water body pollutants are complex in types and can be generally divided into three categories, namely inorganic ions, heavy metal ions and organic pollutants. In the list of priority controlled pollutants proposed in countries around the world, organic pollutants are the key control targets. The organic pollutants affecting the water environment quality mainly come from domestic sewage and industrial wastewater, especially industrial wastewater, and become wastewater with high treatment difficulty and low treatment efficiency due to the characteristics of complex components, large water quality fluctuation, deep chromaticity, high toxic content, poor biodegradability and the like.
The advanced chemical oxidation method is a very effective method for decomposing refractory organic matters, and in recent 20 years, various advanced oxidation methods are discovered and rapidly applied to the field of water treatment, mainly comprising photocatalytic oxidation, sonochemical oxidation, electrochemical oxidation, wet oxidation, supercritical water oxidation and the like. The advanced chemical oxidation method enables the molecular kinetic energy of organic matters to reach the chemical reaction threshold, and particularly, wet oxidation is realized by means of increasing the temperature, so that the wet oxidation must be carried out under the harsh conditions of high temperature (125-. Meanwhile, the industrial wastewater contains a large amount of organic matters which are high in salt content, difficult to degrade and difficult to biochemically generate, such as phenolic compounds, which are toxic and difficult to biochemically degrade substances and are widely used as intermediates for preparing preservatives, herbicides, pesticides and medicines. At present, the main treatment methods of the substances comprise a biochemical method, an incineration method and a chemical method, but a longer reaction time is needed, and the incineration method is easy to generate other toxic substances and the like.
Disclosure of Invention
The inventor aims at organic wastewater containing high-salt, difficultly-degraded and difficultly-biochemically-degraded organic matters, establishes electrochemical reaction electrolysis voltage of most of the electrolytic matters by using microwaves according to the electrochemical reaction characteristics of the electrolytic matters in the organic wastewater, and simultaneously realizes advanced chemical oxidation of the difficultly-biochemically-degraded organic matters under normal temperature and normal pressure conditions and degradation of the organic matters under mild conditions, namely, the microwave resonant cavity is combined with chemical reaction, thereby replacing the harsh conditions required by conventional advanced oxidation. Therefore, a microwave high-field advanced oxidation reaction treatment method for organic wastewater is proposed.
In order to achieve the purpose, the invention provides the following technical scheme:
a microwave strong field advanced oxidation reaction treatment method for organic wastewater comprises the following steps:
step S1, a wastewater inlet and a medicament inlet are arranged on the liquid preparation pool, organic wastewater entering the liquid preparation pool through the wastewater inlet and a chemical medicament entering the liquid preparation pool through the medicament inlet are mixed in the liquid preparation pool and flow into the microwave reaction unit;
s2, forming a microwave strong field in the microwave reaction unit, oxidizing and decomposing organic matters in the organic wastewater by chemical agents under the action of the microwave strong field, and allowing the organic wastewater to flow into a temperature control pool through the microwave reaction unit;
step S3, when the temperature of the organic wastewater at the inlet of the temperature control pool is higher than 60 ℃, the temperature control pool is in a working state, absorbs the heat emitted by the organic matter in the oxidation process of the chemical agent, and reduces the temperature of the organic wastewater to below 60 ℃, otherwise, the temperature control pool is in a non-working state, and meanwhile, the organic wastewater flows back to the liquid preparation pool through the temperature control pool;
and S4, repeating the steps S2 to S3 until the organic wastewater reaches the discharge standard.
Further, the microwave reaction unit at least comprises a first-stage microwave reactor, the microwave reactor is provided with a microwave feed-in port, and the microwave feed-in port is provided with a microwave feed-in window.
Furthermore, a microwave tube is arranged on the outer side of the microwave feed-in window, and the inside of the microwave reactor is used as a microwave resonant cavity to promote a microwave strong field to be formed between the inner side of the microwave feed-in window and the inner wall of the microwave reactor.
Further, the electric field of the microwave strong field is more than 30 kV/m.
Further, the microwave feed-in window is made of polytetrafluoroethylene.
Furthermore, an inlet and an outlet are arranged on the microwave reactor, and the sizes of the inlet and the outlet are smaller than that of the microwave feed-in port, so that the microwave is prevented from leaking.
Further, when the microwave reactors are provided with at least two stages, the microwave reactors of adjacent stages are communicated with each other.
Furthermore, the top of the liquid distribution pool is provided with an openable top cover, and the wastewater inlet and the medicament inlet are both positioned on the top cover.
Further, a liquid outlet, a liquid return port and a liquid outlet are arranged at the bottom of the liquid preparation pool, the liquid outlet is communicated with the microwave reaction unit, and the liquid return port is communicated with the temperature control pool.
Further, the waste water inlet is obliquely arranged, the medicament inlet is arranged along the vertical direction, and the extension line of the waste water inlet and the extension line of the medicament inlet are intersected.
Furthermore, the inside in liquid distribution tank is equipped with the hang plate, and the hang plate surface is just being equipped with the wave arch to the crossing department of extension line of waste water import and medicament entry to reinforcing organic waste water and chemical agent's mixed effect.
Further, the hang plate sets firmly on the inner wall of liquid distribution tank through the mount pad, be equipped with the mounting groove that holds the hang plate on the mount pad.
Furthermore, a gap is reserved between the mounting seat and the side wall of the liquid distribution pool to form a flow channel for the organic wastewater to flow.
Furthermore, the bottom of the liquid distribution pool is provided with flow baffle plates which are distributed in a staggered manner.
Furthermore, the flow baffle is fixedly arranged on the inner wall of the liquid distribution tank through a fixed seat.
Furthermore, keep off and flow the board and set up along vertical direction, and keep off and flow the board and establish to two-layer, the fender that is located the upper strata flows the board and is connected with the fixing base, and the fender that is located the lower floor flows the board and is connected with the fixing base through the connecting rod.
Furthermore, a space is reserved between the flow baffle on the lower layer and the bottom surface of the liquid distribution tank.
Furthermore, a back washing port is arranged on the side wall of the liquid distribution tank.
Further, the liquid return port is located on the side wall of the liquid distribution pool and is close to the circulation channel, the liquid outlet is opposite to the liquid return port, and the liquid discharge port is located on the bottom surface of the liquid distribution pool.
Furthermore, a cooling pipe is arranged in the temperature control pool, and when the temperature of the organic wastewater at the inlet of the temperature control pool is higher than 60 ℃, cooling water is introduced into the cooling pipe to ensure that the temperature of the organic wastewater at the outlet of the temperature control pool is lower than 60 ℃.
The invention has the beneficial effects that:
by arranging the microwave reaction unit, the electrochemical reaction electrolytic voltage of most electrolytic substances in the organic wastewater is established by microwaves, the advanced chemical oxidation of organic matters difficult to be biochemically and difficultly degraded under normal temperature and pressure and the degradation of the organic matters under mild conditions are realized, the microwave resonant cavity is combined with chemical reaction, the harsh conditions required by the conventional advanced oxidation are replaced, and the microwave reaction unit is easy to realize and popularize on a large scale.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the structure of a liquid preparation tank;
FIG. 3 is a schematic structural view of a microwave reactor;
fig. 4 is a schematic assembly of at least two stages of microwave reactors.
In the drawings: 1-liquid preparation pool, 2-microwave reaction unit, 3-temperature control pool, 4-wastewater inlet, 5-medicament inlet, 6-liquid outlet, 7-liquid return port, 8-liquid discharge port, 9-back flush port, 10-inclined plate, 11-mounting seat, 12-wave protrusion, 13-baffle plate, 14-fixing seat, 15-microwave feed-in window, 16-microwave tube, 17-microwave reactor, 18-inlet, 19-outlet, 20-microwave feed-in port and 21-connecting rod.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
The first embodiment is as follows:
as shown in figure 1, a microwave high-intensity field advanced oxidation reaction treatment method for organic wastewater, organic wastewater and chemical agents are added into a liquid preparation tank 1 and mixed, the mixed organic wastewater flows into a microwave reaction unit 2 through the liquid preparation tank 1, organic matters in the organic wastewater are oxidized and decomposed by the chemical agents under the action of a microwave high field, and meanwhile, the reacted organic wastewater flows back to the liquid preparation tank 1 through a temperature control tank 3 and circulates circularly until the organic wastewater reaches the discharge standard. Wherein, join in marriage liquid pond 1, microwave reaction unit 2 and accuse temperature pond 3 and pass through the pipeline intercommunication in proper order, simultaneously, be equipped with the water pump on the pipeline for organic waste water circulation.
As shown in fig. 1 and 2, an openable top cover is arranged at the top of the liquid preparation tank 1, and preferably, the top cover and the main body of the liquid preparation tank are in a split structure, or one side of the top cover is hinged with the main body of the liquid preparation tank. Be equipped with waste water entry 4 and medicament entry 5 on the top cap, organic waste water pours into through waste water entry 4 and joins in marriage in the liquid pond 1, and chemical agent is put into to joining in marriage in the liquid pond 1 through medicament entry 5, simultaneously, the bottom of joining in marriage liquid pond 1 is equipped with liquid outlet 6, returns liquid mouth 7 and leakage fluid dram 8. Specifically, the liquid outlet 6 is communicated with the microwave reaction unit 2, the liquid return port 7 is communicated with the temperature control pool 3 to form a circulation channel, and the organic wastewater reaching the discharge standard is discharged through the liquid discharge port 8.
In order to realize the uniform mixing of the organic wastewater and the chemical agents, the wastewater inlet 4 is obliquely arranged, the agent inlet 5 is arranged along the vertical direction, and the extension lines of the wastewater inlet 4 and the agent inlet 5 are intersected inside the liquid distribution tank 1, that is, the organic wastewater and the chemical agents are thrown to the same position, so that the organic wastewater and the chemical agents are conveniently mixed. Meanwhile, the inside of the liquid distribution tank 1 is provided with the inclined plate 10, the surface of the inclined plate 10 is opposite to the intersection of the extension lines of the wastewater inlet 4 and the medicament inlet 5, and the wave protrusion 12 is arranged at the intersection of the extension lines of the wastewater inlet 4 and the medicament inlet 5, when organic wastewater and chemical medicament are thrown to the wave protrusion 12, the organic wastewater and the chemical medicament are splashed under the action of the wave protrusion 12, so that the mixing effect of the organic wastewater and the chemical medicament is enhanced.
In order to improve the stability of hang plate 10, hang plate 10 sets firmly on the inner wall of liquid distribution tank 1 through mount pad 11, and is corresponding, be equipped with the mounting groove that holds hang plate 10 on the mount pad 11, open the top cap after, can install or dismantle hang plate 10, especially, when the protruding 12 surfaces of wave are detained the debris in the organic waste water, be convenient for take out hang plate 10, clear up. Meanwhile, a gap is reserved between the mounting seat 11 and the side wall of the liquid distribution tank 1 to form a flow channel for the organic wastewater to flow through, and specifically, the flow channel is located obliquely below the inclined plate 10, so that the organic wastewater and the chemical agent can flow through conveniently. Meanwhile, the bottom of the liquid distribution tank 1 is provided with flow baffle plates 13 which are distributed in a staggered manner, the flow baffle plates 13 are arranged along the vertical direction, and the flow baffle plates 13 are fixedly arranged on the inner wall of the liquid distribution tank 1 through fixing seats 14. Specifically, the flow baffle 13 is two-layered, the flow baffle on the upper layer is directly connected to the fixing base 14, the flow baffle on the lower layer is connected to the fixing base 14 through the connecting rod 21, the fixing base 14 is fixedly connected to the inner wall of the liquid distribution tank 1, and meanwhile, the flow baffle on the upper layer and the flow baffle on the lower layer are respectively connected to the inner wall of the liquid distribution tank 1. The flow baffle plates positioned on the upper layer and the lower layer are arranged in a staggered manner to form a Z-shaped channel for the circulation of organic wastewater and chemical agents, so that the mixing time of the organic wastewater and the chemical agents is prolonged.
Correspondingly, return liquid mouth 7 and be located the lateral wall of joining in marriage liquid pool 1 and be close to the circulation passageway setting, liquid outlet 6 sets up with returning liquid mouth 7 relatively, and liquid outlet 6 keeps away from the circulation passageway setting promptly, leakage fluid dram 8 is located the bottom surface of joining in marriage liquid pool 1, is convenient for discharge and reaches emission standard's organic waste water. The organic waste water contains inevitable impurities, so the impurities may be retained on the bottom surface of the liquid distribution tank 1 and the surface of the flow baffle 13, in order to clean up the retained impurities, the side wall of the liquid distribution tank 1 is provided with the back flush port 9, the back flush port 9 is arranged corresponding to the flow baffle on the upper layer, the back flush port 9 is externally connected with a water source, the flow baffle on the upper layer is flushed by clean water, the clean water falls to the bottom surface of the flow baffle and the liquid distribution tank on the lower layer under the self-gravity action, the flow baffle and the bottom surface of the liquid distribution tank on the lower layer are flushed, correspondingly, a space is reserved between the flow baffle on the lower layer and the bottom surface of the liquid distribution tank, the clean water is convenient to circulate and the impurities are collected, and finally, the impurities are discharged through the liquid discharge port 8 under the flushing action.
Example two:
as shown in fig. 1 and 3, the microwave reaction unit 2 includes at least one stage of microwave reactor 17, and the microwave reactor 17 is provided with a microwave feed port 20, and the inside thereof is used as a microwave resonant cavity. The microwave feeding port 20 is provided with a microwave feeding window 15, and preferably, the microwave feeding window 15 is made of polytetrafluoroethylene. The microwave feed window 15 is provided with a microwave tube 16 at its outer side, so that a microwave strong field is formed between the inner side of the microwave feed window 15 and the inner wall of the microwave reactor 17, i.e. a microwave strong field is formed in the microwave resonant cavity. Preferably, the electric field of the microwave high field is more than 30 kV/m. The microwave reactor 17 is provided with an inlet 18 and an outlet 19, which are convenient for the circulation of organic wastewater, and simultaneously, the sizes of the inlet 18 and the outlet 19 are smaller than the size of the microwave feed inlet 20 in order to avoid the leakage of microwaves through the inlet 18 and the outlet 19.
Microwave is fed in from the microwave feed inlet 20, and then a microwave strong field is established in the microwave resonant cavity, organic wastewater enters the microwave resonant cavity from the inlet 18, and is subjected to the action of the microwave strong field, so that the chemical reaction between organic matters in the organic wastewater and chemical agents is accelerated, meanwhile, the work of the microwave reactor 17 is not influenced, and then the organic wastewater flows out from the outlet 19, namely, the microwave strong field assists in generating and maintaining the chemical reaction between the organic matters in the organic wastewater and the chemical agents. The organic wastewater repeatedly and circularly flows through the microwave resonant cavity under the action of an external force (such as a water pump) until COD in the organic wastewater reaches a required value, namely the organic wastewater reaches the discharge standard.
As shown in fig. 4, in order to improve the working efficiency, the microwave reactor 17 may be provided with at least two stages, and the microwave reactors 17 of adjacent stages are communicated with each other, the organic wastewater and the chemical agent sequentially pass through the microwave reactor 17 in the microwave reaction unit 2, and are subjected to the action of the strong microwave field, the organic substance reacts with the chemical agent, and the organic substance is oxidized by the chemical agent and decomposed into CO2And H2O。
Example three:
as shown in fig. 1 to 4, organic wastewater enters the liquid distribution tank 1 through the wastewater inlet 4, chemical agent enters the liquid distribution tank through the agent inlet 5, the organic wastewater and the chemical agent are primarily mixed under the action of the wave protrusion 12, and then flow into the bottom of the liquid distribution tank 1 through the flow channel, and the organic wastewater and the chemical agent are secondarily mixed under the action of the flow baffle 13 and flow into the microwave reaction unit 2.
According to the requirements of organic oxidation reaction on physical conditions, under mild conditions (normal temperature and normal pressure), a microwave strong field is used for establishing organic advanced oxidation reaction conditions in the organic wastewater, namely, a microwave resonant cavity is combined with chemical reactions, and meanwhile, electrochemical reaction electrolytic voltage (about 3V) of most electrolytic substances is formed in a local area (such as a 1mm space), so that the organic advanced oxidation reaction is realized and maintained. Under the action of the microwave strong field, the organic matters in the organic wastewater are oxidized by the chemical agent and decomposed into CO2And H2And O, the organic wastewater after the reaction flows into a temperature control pool 3. When the temperature of the organic wastewater at the inlet of the temperature control pool is higher than 60 ℃, the temperature control pool 3 is in a working stateAbsorbing heat emitted by the organic matter in the oxidation process of the chemical agent, reducing the temperature of the organic wastewater to below 60 ℃, otherwise, keeping the temperature control pool 3 in a non-working state, and simultaneously, returning the organic wastewater to the liquid preparation pool 1 through the temperature control pool 3. And repeating the circulation process until the organic wastewater reaches the discharge standard.
Specifically, a cooling pipe is arranged in the temperature control pool 3, and when the temperature of the organic wastewater at the inlet of the temperature control pool is higher than 60 ℃, cooling water is introduced into the cooling pipe to ensure that the temperature of the organic wastewater at the outlet of the temperature control pool is lower than 60 ℃. That is to say, the temperature control tank 3 reduces the temperature of the organic wastewater to below 60 ℃, so that safety accidents caused by overhigh temperature of the organic wastewater are avoided, and the safety is improved. Preferably, the cooling pipe sets up to the multiunit, and the cooling pipe is the bending type, improves cooling efficiency.
Example four:
parts of this embodiment that are the same as the first to third embodiments are not described again, except that:
the microwave resonant cavity is a square cavity, the length of the cavity is 8cm, the width of the cavity is 7cm, the height of the cavity is 6cm, the resonant frequency is 2450MHz, microwaves are fed from a microwave feed port 20 at the upper part, the microwave feed port 20 is a round hole, the diameter of the round hole is 5cm, and the round hole is used for installing a microwave feed window 15. The diameters of the pipelines of the inlet 18 and the outlet 19 are both 2cm, and the length of the pipeline is more than 5 cm.
In the embodiment, the organic wastewater mainly comprises dimethyl sulfoxide, before treatment, the COD value of the organic wastewater is 12000, the primary treatment capacity is 20kg, 120g of ferrous sulfate heptahydrate and 4kg of hydrogen peroxide (30%), after 1 hour of treatment, the content of the dimethyl sulfoxide is lower than 1ppm, the COD value is 500, the COD value is reduced by times, and the effect is remarkable.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (10)
1. A microwave strong field advanced oxidation reaction treatment method for organic wastewater is characterized by comprising the following steps:
step S1, a wastewater inlet and a medicament inlet are arranged on the liquid preparation pool, organic wastewater entering the liquid preparation pool through the wastewater inlet and a chemical medicament entering the liquid preparation pool through the medicament inlet are mixed in the liquid preparation pool and flow into the microwave reaction unit;
s2, forming a microwave strong field in the microwave reaction unit, wherein organic matters in the organic wastewater are oxidized and decomposed by chemical agents under the action of the microwave strong field, and meanwhile, the organic wastewater after reaction flows into a temperature control pool;
step S3, when the temperature of the organic wastewater at the inlet of the temperature control pool is higher than 60 ℃, the temperature control pool is in a working state, absorbs the heat emitted by the organic matter in the oxidation process of the chemical agent, and reduces the temperature of the organic wastewater to below 60 ℃, otherwise, the temperature control pool is in a non-working state, and meanwhile, the organic wastewater flows back to the liquid preparation pool through the temperature control pool;
and S4, repeating the steps S2 to S3 until the organic wastewater reaches the discharge standard.
2. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 1, wherein the microwave reaction unit comprises at least one stage of microwave reactor, the microwave reactor is provided with a microwave feed port, and the microwave feed port is provided with a microwave feed window.
3. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 2, wherein a microwave tube is arranged outside the microwave feeding window to promote a microwave high field to be formed between the inner side of the microwave feeding window and the inner wall of the microwave reactor, and the electric field of the microwave high field is more than 30 kV/m.
4. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 3, wherein the microwave reactor is provided with an inlet and an outlet, and the size of the inlet and the size of the outlet are both smaller than that of the microwave feed inlet, so as to avoid microwave leakage.
5. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 1, wherein the wastewater inlet is disposed obliquely, the chemical inlet is disposed along a vertical direction, and the wastewater inlet intersects with an extension line of the chemical inlet.
6. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 5, wherein the interior of the liquid preparation tank is provided with an inclined plate, and the intersection of the surface of the inclined plate, which faces the extension line of the wastewater inlet and the medicament inlet, is provided with a wave protrusion to enhance the mixing effect of the organic wastewater and the chemical medicament.
7. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 6, wherein the inclined plate is fixedly arranged on the inner wall of the liquid distribution tank through a mounting seat, the mounting seat is provided with a mounting groove for accommodating the inclined plate, and a gap is left between the mounting seat and the side wall of the liquid distribution tank to form a flow channel for the organic wastewater to flow through.
8. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to claim 7, wherein a liquid return port, a liquid outlet and a back flush port are provided on the side wall of the liquid preparation tank, the liquid return port is communicated with the temperature control tank, the liquid return port is disposed near the flow channel, the liquid outlet is communicated with the microwave reaction unit, the liquid outlet is disposed opposite to the liquid return port, and a liquid discharge port is provided on the bottom surface of the liquid preparation tank.
9. The microwave high-field advanced oxidation reaction treatment method for organic wastewater according to any one of claims 1 to 8, wherein the bottom of the liquid distribution tank is provided with flow baffles which are distributed in a staggered manner, and the flow baffles are fixedly arranged on the inner wall of the liquid distribution tank through fixing seats.
10. The method according to claim 9, wherein the baffle plates are arranged in a vertical direction, and the baffle plates are arranged in two layers, and a space is left between the baffle plate at the lower layer and the bottom surface of the liquid distribution tank.
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