Microwave normal temperature wet oxidation wastewater advanced treatment method

Abstract

The invention discloses a microwave normal temperature wet oxidation wastewater advanced treatment method, belonging to the technical field of wastewater treatment. The method comprises the followingsteps: removing suspended matters contained in wastewater to be treated by using a pretreatment air flotation device with specific results; putting the wastewater with the suspended matters removed into a microwave oxidation reactor equipped with an oxidation trigger, introducing oxygen, and performing the whole reaction process under the microwave condition with the microwave power of 50W to 200W; and precipitating and filtering the reaction product obtained after the reaction treatment. According to the invention, water molecules are rapidly vibrated by microwaves, pollutants in the water are promoted to undergo combustion reaction with artificially added oxygen and oxidants triggering the reaction, and the oxidation decomposition of organic pollutants is realized, so that the problems that the safety of the reaction and the high construction and operation cost can be realized only when the water is above the super critical point under high temperature and high pressure in the conventional wet oxidation process are solved.

Description

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a method for advanced treatment of wastewater in a wet oxidation process. Background technique

[0002] In the 1970s and 1980s, Americans discovered through research on the high-temperature and high-pressure state of water that there is a supercritical state in the solid-liquid-gas three-state of water. In this state, the gaseous and liquid states of water coexist, and it has quite strong reactivity and Mass transfer efficiency, which can realize the combustion reaction of substances in contact with oxygen in water. On this basis, a wet oxidation process (also known as supercritical water oxidation process) was developed for the treatment of high-concentration, refractory, difficult-to-separate, and easily oxidized wastewater. There are also domestic applications in landfill leachate treatment, chemical waste treatment, etc. .

[0003] However, the advanced wastewa...

Examples

Embodiment 1

[0025] Such as figure 1 A kind of pretreatment air flotation device shown comprises air flotation box 8, and air flotation box 8 has air flotation contact zone and separation zone, and dissolved air releaser 16 is housed in the air flotation contact zone, and dissolved air releaser 16 passes through trachea Connect with the gas tank 15. A slag scraper 9 is installed on the top of the air flotation box 8. A slag discharge tank 10 is installed in front of the slag scraper 9, and a drainage deflector 12 is installed below the slag discharge tank 10 in the air flotation box 8, and the drainage guide A water flow channel is provided between the plate 12 and the bottom plate of the air flotation box 8 . The air flotation tank 8 is equipped with a drainage pipe 11 and a return water pipe 13 connected to the dissolved air tank 15, and the return water pipe 13 is equipped with a circulation pump 14.

[0026] The water inlet of the air flotation box 8 is connected with the water outle...

Embodiment 2

[0036] Example 2——Microwave room temperature wet oxidation wastewater advanced treatment method

[0037] The difference between this embodiment and embodiment 1 is:

[0038] figure 1 The inclination angle a of the settling inclined plate 7 in the pretreatment air flotation device is 65 degrees; other features are the same as in Embodiment 1.

[0039] figure 2 The end of the inlet pipe in the microwave oxidation reactor under the liquid level in the reactor is 100 mm away from the liquid level in the reactor, and the diameter of the micropore is 6 mm; other features are the same as in Example 1.

[0040] With maleic anhydride wastewater as the wastewater to be treated, adopt the method of the present invention to process:

[0041] A. Remove the suspended solids contained in the wastewater to be treated by using the above-mentioned pretreatment air flotation device:

[0042] B. Put the waste water after removing suspended solids in step A into a microwave oxidation reactor ...

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a method for advanced treatment of wastewater in a wet oxidation process. Background technique

[0002] In the 1970s and 1980s, Americans discovered through research on the high-temperature and high-pressure state of water that there is a supercritical state in the solid-liquid-gas three-state of water. In this state, the gaseous and liquid states of water coexist, and it has quite strong reactivity and Mass transfer efficiency, which can realize the combustion reaction of substances in contact with oxygen in water. On this basis, a wet oxidation process (also known as supercritical water oxidation process) was developed for the treatment of high-concentration, refractory, difficult-to-separate, and easily oxidized wastewater. There are also domestic applications in landfill leachate treatment, chemical waste treatment, etc. .

[0003] However, the advanced wastewa...

Examples

Embodiment 1

[0025] Such as figure 1 A kind of pretreatment air flotation device shown comprises air flotation box 8, and air flotation box 8 has air flotation contact zone and separation zone, and dissolved air releaser 16 is housed in the air flotation contact zone, and dissolved air releaser 16 passes through trachea Connect with the gas tank 15. A slag scraper 9 is installed on the top of the air flotation box 8. A slag discharge tank 10 is installed in front of the slag scraper 9, and a drainage deflector 12 is installed below the slag discharge tank 10 in the air flotation box 8, and the drainage guide A water flow channel is provided between the plate 12 and the bottom plate of the air flotation box 8 . The air flotation tank 8 is equipped with a drainage pipe 11 and a return water pipe 13 connected to the dissolved air tank 15, and the return water pipe 13 is equipped with a circulation pump 14.

[0026] The water inlet of the air flotation box 8 is connected with the water outle...

Embodiment 2

[0036] Example 2——Microwave room temperature wet oxidation wastewater advanced treatment method

[0037] The difference between this embodiment and embodiment 1 is:

[0038] figure 1 The inclination angle a of the settling inclined plate 7 in the pretreatment air flotation device is 65 degrees; other features are the same as in Embodiment 1.

[0039] figure 2 The end of the inlet pipe in the microwave oxidation reactor under the liquid level in the reactor is 100 mm away from the liquid level in the reactor, and the diameter of the micropore is 6 mm; other features are the same as in Example 1.

[0040] With maleic anhydride wastewater as the wastewater to be treated, adopt the method of the present invention to process:

[0041] A. Remove the suspended solids contained in the wastewater to be treated by using the above-mentioned pretreatment air flotation device:

[0042] B. Put the waste water after removing suspended solids in step A into a microwave oxidation reactor ...

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