CN110422953B - Microwave normal temperature wet oxidation wastewater advanced treatment method - Google Patents
Microwave normal temperature wet oxidation wastewater advanced treatment method Download PDFInfo
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- CN110422953B CN110422953B CN201910790809.1A CN201910790809A CN110422953B CN 110422953 B CN110422953 B CN 110422953B CN 201910790809 A CN201910790809 A CN 201910790809A CN 110422953 B CN110422953 B CN 110422953B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009279 wet oxidation reaction Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910001868 water Inorganic materials 0.000 claims abstract description 74
- 238000006243 chemical reaction Methods 0.000 claims abstract description 65
- 238000005188 flotation Methods 0.000 claims abstract description 44
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 5
- 230000001376 precipitating effect Effects 0.000 claims abstract description 5
- 239000007800 oxidant agent Substances 0.000 claims abstract description 3
- 230000001590 oxidative effect Effects 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 26
- 238000004062 sedimentation Methods 0.000 claims description 14
- 239000010865 sewage Substances 0.000 claims description 12
- 239000000701 coagulant Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 4
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 238000006864 oxidative decomposition reaction Methods 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 9
- 238000005273 aeration Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009284 supercritical water oxidation Methods 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
-
- 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a microwave normal-temperature wet oxidation wastewater advanced treatment method, and belongs to the technical field of wastewater treatment. It comprises the following steps: removing suspended matters contained in the wastewater to be treated by using a pretreatment air flotation device with a specific result; then the wastewater after removing the suspended matters is put into a microwave oxidation reactor filled with an oxidation trigger, oxygen is introduced, and the whole reaction process is carried out under the microwave condition that the microwave power is 50W-200W; and precipitating and filtering a reaction product obtained after the reaction treatment. The invention makes water molecules vibrate rapidly through microwaves, promotes pollutants in water to have combustion reaction with artificially added oxygen and an oxidant triggering the reaction, and realizes the oxidative decomposition of organic pollutants, thereby solving the problems of high safety and high construction and operation cost of reaction which can be realized only by making the water be above a supercritical point under high temperature and high pressure in the conventional wet oxidation process.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for deeply treating wastewater in a wet oxidation process.
Background
In the seventy-eight years of the last century, through research on the high-temperature and high-pressure state of water, Americans find that a supercritical state exists in the solid-liquid-gas three states of water, and in the supercritical state, the gaseous state and the liquid state of water coexist, so that the supercritical state has quite strong reaction activity and mass transfer efficiency, and the combustion reaction of substances in contact with oxygen in water can be realized. On the basis, a wet oxidation process (also called a supercritical water oxidation process) is developed and used for treating high-concentration degradation-resistant, separation-resistant and oxidation-resistant wastewater, and domestic application in the aspects of landfill leachate treatment, chemical waste liquid treatment and the like is also provided.
However, the above-mentioned advanced wastewater treatment method of the wet oxidation process has some disadvantages. For example, since the supercritical state needs to be maintained to maintain the reaction during the whole advanced treatment process of the wastewater, the critical temperature T =374 ℃ and the critical pressure P =22.1MPa of the water. When the reaction condition is reached, a large amount of energy is consumed, but at present, both heat recovery and kinetic energy recovery have the problem of recovery efficiency, and taking an energy recovery device used for seawater desalination as an example, the theoretical value can reach 94%, the actual operation data is usually about 40% -70%, and the efficiency can only be lower due to the multi-stage heat recovery. Considering that energy recovery equipment needs to resist high temperature and high pressure and strong oxidation corrosion, the investment is huge. In addition, from the aspect of molecular physics, the supercritical state is actually a polymeric molecular state after the kinetic energy of water molecules exceeds the viscous force of mutual attraction between water molecules, and if the supercritical state is not bound by pressure, the mutual action force between water molecules forms huge repulsive force and forms explosion. That is, the deep treatment of wastewater by using the wet oxidation process requires extremely high energy consumption and extremely harsh reaction conditions, and the applicability is poor, so that the deep treatment is difficult to popularize and apply.
Disclosure of Invention
The invention provides a microwave normal-temperature wet oxidation wastewater advanced treatment method, which can solve the problems of high energy consumption and harsh reaction conditions in the prior wet oxidation process for advanced treatment of wastewater.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
it comprises the following steps:
A. removing suspended matters contained in the wastewater to be treated;
B. putting the wastewater from step A after removing the suspended matters into a microwave oxidation reactor filled with an oxidation trigger, introducing oxygen, and carrying out the whole reaction process under the microwave condition that the microwave power is 50-200W;
C. and D, precipitating and filtering a reaction product obtained after the reaction treatment in the step B.
In the above technical solution, a more specific technical solution may also be: suspended matters contained in the wastewater to be treated are removed by adopting a pretreatment air flotation device, the pretreatment air flotation device comprises an air flotation tank, a water inlet of the air flotation tank is connected with a water outlet of a filter tank through a pipeline, one side of the filter tank, which is far away from the air flotation tank, is provided with an inclined filter screen, the upper part of the filter screen is provided with an overflow tank, a water inlet pipe is arranged above the overflow tank, and the bottom of the filter screen is provided with a waste residue collecting tank; the filter box is internally provided with a plurality of inclined sedimentation plates at intervals, the side wall of the filter box is provided with a coagulant inlet pipe, the coagulant inlet pipe is provided with a pressure pump, and the bottom of the filter box is conical and is provided with a sewage discharge pipe.
Further, the inclined sedimentation plate; water through holes are distributed on the inclined sedimentation plates; the water through holes are arranged in a staggered manner; the sedimentation inclined plate; the inclination angle a is 55-65 degrees; the air flotation tank; the device is provided with an air flotation contact area and a separation area, wherein a dissolved air releaser is arranged in the air flotation contact area; said dissolved air releaser; passing through an air pipe and a dissolved air tank; connecting; in the air flotation tank; a drainage guide plate is arranged in the water tank; a water flow channel is arranged between the drainage guide plate and the bottom plate of the air flotation tank; and a drainage guide plate is arranged in the air flotation tank, and a water flow channel is arranged between the drainage guide plate and the bottom plate of the air flotation tank.
Further, microwave oxidation reactor is including the reation kettle who takes the lid of the intake pipe of connecting oxygen, the reation kettle top is equipped with the inlet tube, reation kettle is equipped with outlet pipe, its characterized in that: the inner wall of the reaction kettle is provided with a composite biological packing layer, the top of the reaction kettle is provided with a microwave generator extending into the liquid level in the reaction kettle, the air inlet pipe extends into the liquid level in the reaction kettle, winds along the bottom of the reaction kettle and then extends upwards to a position 10 mm to 120 mm below the liquid level in the reaction kettle to stop, and numerous micropores are uniformly distributed at the position of the air inlet pipe below the liquid level in the reaction kettle; and an exhaust pipe extending out of the cover is arranged above the liquid level in the reaction kettle and is connected with a gas collection system.
Furthermore, the water outlet pipe is arranged at the bottom of the reaction kettle.
Further, the tail end of the air inlet pipe below the liquid level in the reaction kettle is 40 mm away from the liquid level in the reaction kettle.
Further, the diameter of the micropores is in a range of 2 mm to 6 mm.
Further, the diameter of the micropores is in a range of 2 mm to 6 mm.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention makes water molecules vibrate rapidly through microwaves, promotes pollutants in water to have combustion reaction with artificially added oxygen and an oxidant triggering the reaction, and realizes the oxidative decomposition of organic pollutants, thereby solving the problems of high safety and high construction and operation cost of reaction which can be realized only by making the water be above a supercritical point under high temperature and high pressure in the conventional wet oxidation process.
2. Regarding the pretreatment air flotation device, an inclined filter screen is arranged on one side of a filter box, which is far away from the air flotation box, wastewater enters an overflow groove from a water inlet pipe, flows out of the overflow groove to the filter screen, impurities in the wastewater are separated by the filter screen, the impurities fall into a waste residue collecting tank, and the wastewater enters the filter box; coagulant is added into the filter tank through a pressure pump, the coagulant promotes suspended matters in the wastewater to be coagulated, the coagulated particle suspended matters fall into the bottom of the filter tank through a settling inclined plate and are discharged through a drain pipe, and the tiny suspended matters enter the air flotation tank through a water outlet. The filter box is adopted to filter and precipitate the dirt in the water and then the sewage enters the air flotation box, so that the pretreatment effect of the wastewater is improved, the load of a subsequent wastewater treatment system is reduced, and unnecessary resource waste is avoided; in addition, water through holes are distributed on the precipitation inclined plates, the water through holes on two adjacent precipitation inclined plates are arranged in a staggered mode, and the inclination angle a of each precipitation inclined plate is 55-65 degrees. The working efficiency of wastewater treatment is ensured, and the precipitation effect is further improved; the air flotation tank is provided with an air flotation contact area and a separation area, a dissolved air releaser is arranged in the air flotation contact area, and the dissolved air releaser is connected with a dissolved air tank through an air pipe. The dissolved gas releaser discharges micro bubbles, so that suspended matters in the wastewater are adhered to the micro bubbles to float, and the effect of separating the suspended matters from water is improved.
3. The microwave oxidation reactor adopts the technical scheme that composite biological fillers are arranged on the inner wall of a reaction kettle, water molecules are promoted to rapidly vibrate and rotate at a high speed through microwaves, and in the process of violent friction among the water molecules, the water molecules are enabled to reach a supercritical point state, organic pollutants in water are promoted to be fully contacted with oxygen filled in the water, a quasi-combustion effect is formed under the action of an oxidation trigger, the pollutants are fully oxidized and decomposed, and the oxidative decomposition of the organic pollutants is realized; the air inlet pipe enters a special structure below the liquid level of the reaction kettle, so that uniform water and air distribution of air-water reverse convection can be fully realized, micro bubbles float upwards, water flow is downward, suspended matters in water are removed in a micro bubble filtering mode, the oxidation treatment load is reduced, and the pretreatment cost is saved; the micropores of the air inlet pipe can realize the micropore aeration mode for mixing oxygen and water, oxygen is supplied in the reaction process, and the size of the micropores is limited so as to balance aeration quantity and aeration pressure to the maximum extent and realize uniform aeration; the oxidation reactor has the advantages of simple structure, low construction cost and use cost, resource saving, obvious effect of treating organic pollution in water and easy wide application.
Drawings
FIG. 1 is a schematic representation of the results of the pretreatment air flotation device of the present invention.
FIG. 2 is a schematic representation of the results of the microwave oxidation reactor of the present invention.
Detailed Description
The present invention is further described in detail below with reference to examples;
example 1
The pretreatment air flotation device shown in fig. 1 comprises an air flotation tank 8, wherein the air flotation tank 8 is provided with an air flotation contact area and a separation area, a dissolved air releaser 16 is arranged in the air flotation contact area, and the dissolved air releaser 16 is connected with a dissolved air tank 15 through an air pipe. The upper part of the air flotation tank 8 is provided with a slag scraper 9, a slag discharging groove 10 is arranged in front of the slag scraper 9, a drainage guide plate 12 is arranged in the air flotation tank 8 and below the slag discharging groove 10, and a water flow channel is arranged between the drainage guide plate 12 and the bottom plate of the air flotation tank 8. The air flotation tank 8 is provided with a drain pipe 11 and a return water pipe 13 connected with a dissolved air tank 15, and the return water pipe 13 is provided with a circulating pump 14.
The water inlet of the air flotation tank 8 is connected with the water outlet of the filter tank 1 through a pipeline, one side of the filter tank 1, which is far away from the air flotation tank 8, is provided with a filter screen 3 which is arranged obliquely, the upper part of the filter screen 3 is provided with an overflow groove 6, a water inlet pipe 5 is arranged above the overflow groove 6, and the bottom of the filter screen 3 is provided with a waste residue collecting tank 2. Three inclined sedimentation plates 7 are arranged in the filter box 1 at intervals, water through holes are distributed on the inclined sedimentation plates 7, the water through holes on two adjacent inclined sedimentation plates 7 are staggered, the inclination direction of the inclined sedimentation plates 7 is opposite to that of the filter screen 3, and the inclination angle a of the inclined sedimentation plates 7 is 55 degrees. A coagulant inlet pipe 4 is arranged on the side wall of the filter tank 1, a booster pump is arranged on the coagulant inlet pipe 4, and the bottom of the filter tank 1 is conical and is provided with a sewage discharge pipe 17.
When the device works, sewage enters the overflow groove 6 from the water inlet pipe 5, flows out of the overflow groove 6 to the filter screen 3, impurities in the sewage are separated through the filter screen 3, the impurities fall into the waste residue collecting groove 2, and the sewage enters the filter box 1; coagulant is added into the filter tank 1 through a pressure pump, the coagulant promotes suspended matters in the sewage to be coagulated, the coagulated particle suspended matters fall into the bottom of the filter tank 1 through a precipitation inclined plate 7 and are discharged through a sewage discharge pipe 7, and the tiny suspended matters enter an air flotation tank 8 through a water outlet. The air supporting case 8 is equipped with air supporting contact zone and disengagement zone, emits the microbubble through dissolving gas releaser 16, makes the suspended solid in the sewage adhere and float at the microbubble, increases the effect of suspended solid and separation of water, adopts and scrapes the suspended solid of sediment machine 9 with the separation and scrapes slag discharging groove 10. The pretreatment air floatation device improves the pretreatment effect of sewage, lightens the load of a subsequent sewage treatment system and avoids unnecessary resource waste.
As shown in fig. 2, the microwave oxidation reactor comprises a reaction vessel 18 with a cover 23 and connected with an oxygen inlet pipe 22, a water inlet pipe 24 is arranged at the top of the reaction vessel 18, a water outlet pipe 28 is arranged on the reaction vessel 18, and the water outlet pipe 28 is arranged at the bottom of the reaction vessel 18. The inner wall of the reaction kettle 18 is provided with a composite biological packing layer 19, the top of the reaction kettle 18 is provided with a microwave generator 25 extending into the liquid level in the reaction kettle, the composite biological packing 19 is arranged on the inner wall of the reaction kettle 18, the microwave promotes the water molecules to rapidly vibrate and rotate at a high speed, and in the process of violent friction between the water molecules, the water molecules are enabled to reach a supercritical point state, so that the organic pollutants in the water are fully contacted with the oxygen filled in the water, and a quasi-combustion effect is formed under the action of an oxidation trigger, so that the pollutants are fully oxidized and decomposed, and the oxidative decomposition of the organic pollutants is realized.
The air inlet pipe 22 extends into the liquid level in the reaction kettle 18, winds along the bottom of the reaction kettle 18 and then extends upwards to a position h below the liquid level in the reaction kettle 18 to stop, wherein h =40 mm, and a plurality of micropores 21 are uniformly distributed at the position, below the liquid level, of the air inlet pipe 22 in the reaction kettle; the diameter of the micropores 21 is here 3 mm; the air inlet pipe 22 enters a special structure below the liquid level of the reaction kettle 18, so that the uniform water and air distribution of air-water reverse convection can be fully realized, micro bubbles float upwards, water flow is downward, suspended matters in water are removed in a micro bubble filtering mode, the oxidation treatment load is reduced, and the pretreatment cost is saved; the micropores 21 of the air inlet pipe can realize the micropore aeration mode for mixing oxygen and water and supplying oxygen in the reaction process, and the size of the micropores 21 is limited so as to balance the aeration amount and the aeration pressure to the maximum extent and realize uniform aeration.
An exhaust pipe 26 extending out of the cover 23 is arranged above the liquid level in the reaction kettle 18, the exhaust pipe 26 is connected with a gas collection system 27, slightly combusted air with little pollution is arranged above the liquid level in the reaction kettle 18, and the temperature is not high under the cooling of water, so the slightly combusted air can enter the gas collection system 27 through the exhaust pipe 26 for recycling.
The paint spraying wastewater is used as wastewater to be treated, and the method is adopted for treating the wastewater:
A. removing suspended matters contained in the wastewater to be treated by using the pretreatment air floatation device:
B. putting the wastewater from step A after removing the suspended matters into a microwave oxidation reactor filled with an oxidation trigger, introducing oxygen, and carrying out the whole reaction process under the microwave condition that the microwave power is 50-200W;
C. and D, precipitating and filtering a reaction product obtained after the reaction treatment in the step B.
In an embodiment, the treatment cost of the paint spraying wastewater is lower than 12 yuan.
Example 2 microwave Normal temperature Wet Oxidation wastewater advanced treatment method
The present embodiment is different from embodiment 1 in that:
the inclined angle a of the inclined sedimentation plate 7 in the pretreatment air flotation device in FIG. 1 is 65 degrees; the remaining features are the same as in example 1.
In the microwave oxidation reactor shown in fig. 2, the distance from the tail end of the air inlet pipe below the liquid level in the reaction kettle to the liquid level in the reaction kettle is 100 mm, and the diameter of the micropore is 6 mm; the remaining features are the same as in example 1.
Maleic anhydride wastewater is used as wastewater to be treated, and the method is adopted for treating the wastewater:
A. removing suspended matters contained in the wastewater to be treated by using the pretreatment air floatation device:
B. putting the wastewater from step A after removing the suspended matters into a microwave oxidation reactor filled with an oxidation trigger, introducing oxygen, and carrying out the whole reaction process under the microwave condition that the microwave power is 50-200W;
C. and D, precipitating and filtering a reaction product obtained after the reaction treatment in the step B.
In the examples, the treatment cost of the paint waste water is also lower than 12 yuan.
Claims (3)
1. A microwave normal temperature wet oxidation wastewater advanced treatment method is characterized in that: the method comprises the following steps:
A. removing suspended matters contained in the wastewater to be treated;
B. putting the wastewater from step A after removing the suspended matters into a microwave oxidation reactor filled with an oxidant, introducing oxygen, and carrying out the whole reaction process under the microwave condition that the microwave power is 50-200W;
C. precipitating and filtering a reaction product obtained after the reaction treatment in the step B;
the wastewater to be treated is suspended matters removed by adopting a pretreatment air flotation device, the pretreatment air flotation device comprises an air flotation tank, a water inlet of the air flotation tank is connected with a water outlet of a filter tank through a pipeline, one side of the filter tank, which is far away from the air flotation tank, is provided with an inclined filter screen, the upper part of the filter screen is provided with an overflow trough, a water inlet pipe is arranged above the overflow trough, and the bottom of the filter screen is provided with a waste residue collecting trough; a plurality of inclined sedimentation plates are arranged in the filter tank at intervals, a coagulant inlet pipe is arranged on the side wall of the filter tank, a pressure pump is arranged on the coagulant inlet pipe, and the bottom of the filter tank is conical and is provided with a sewage discharge pipe;
the inclined sedimentation plates are distributed with water through holes, and the water through holes on two adjacent inclined sedimentation plates are staggered; the inclination angle a of the inclined sedimentation plate is 55-65 degrees; the air flotation tank is provided with an air flotation contact area and a separation area, a dissolved air releaser is arranged in the air flotation contact area, and the dissolved air releaser is connected with a dissolved air tank through an air pipe; a drainage guide plate is arranged in the air flotation tank, and a water flow channel is arranged between the drainage guide plate and the bottom plate of the air flotation tank;
the microwave oxidation reactor comprises a reaction kettle with a cover and connected with an oxygen inlet pipe, a water inlet pipe is arranged at the top of the reaction kettle, a water outlet pipe is arranged on the reaction kettle, a composite biological packing layer is arranged on the inner wall of the reaction kettle, a microwave generator extending into the liquid level in the reaction kettle is arranged at the top of the reaction kettle, the air inlet pipe extends into the liquid level in the reaction kettle, winds along the bottom of the reaction kettle and then extends upwards to a position 10 mm to 120 mm below the liquid level in the reaction kettle to stop, and a plurality of micropores are uniformly distributed at the position of the air inlet pipe below the liquid level in the reaction kettle; an exhaust pipe extending out of the cover is arranged above the liquid level in the reaction kettle and is connected with a gas collection system;
the water outlet pipe is arranged at the bottom of the reaction kettle.
2. The advanced treatment method for the microwave normal-temperature wet oxidation wastewater as claimed in claim 1, characterized in that:
the tail end of the air inlet pipe below the liquid level in the reaction kettle is 40 mm away from the liquid level in the reaction kettle.
3. The advanced treatment method for microwave normal-temperature wet oxidation wastewater as claimed in claim 2, characterized in that:
the diameter of the micropores is in the range of 2 mm to 6 mm.
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| CN108793540A (en) * | 2018-07-20 | 2018-11-13 | 北京科瑞博远科技有限公司 | A kind of method of organic wastewater with difficult degradation thereby advanced treating |
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| CN1374260A (en) * | 2002-04-23 | 2002-10-16 | 大连理工大学 | MIcrowave catalytic oxidation process and apparatus for treating waste water containing hard-to-degrade organic matters |
| CN205635187U (en) * | 2016-05-30 | 2016-10-12 | 齐延伟 | Aquaculture sewage pretreatment equipment |
| CN106076319A (en) * | 2016-06-07 | 2016-11-09 | 神华集团有限责任公司 | Microwave catalysis oxidation processes the catalyst of high concentrated organic wastewater, its preparation method and application |
| CN108793540A (en) * | 2018-07-20 | 2018-11-13 | 北京科瑞博远科技有限公司 | A kind of method of organic wastewater with difficult degradation thereby advanced treating |
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