Microwave ambient temperature wet oxidation wastewater advanced treatment method

Abstract

The invention discloses a microwave normal temperature wet oxidation wastewater advanced treatment method, which belongs to the technical field of wastewater treatment related to the invention. It includes the following steps: removing the suspended solids contained in the wastewater to be treated by using a pretreatment air flotation device with specific results; then putting the suspended solids-removed wastewater into a microwave oxidation reactor equipped with an oxidation trigger, feeding oxygen, and The whole reaction process is carried out under the microwave condition with a microwave power of 50W-200W; the reaction product obtained after the reaction treatment is precipitated and filtered. The invention uses microwaves to rapidly vibrate water molecules, promote the combustion reaction of pollutants in water with artificially added oxygen and oxidants that trigger reactions, and realize the oxidative decomposition of organic pollutants, thereby solving the problem of high temperature and high pressure in conventional wet oxidation processes. The safety of the reaction and the high cost of construction and operation can only be realized above the supercritical point.

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 a supercritical state in the solid-liquid-gas three states of water through research on the high-temperature and high-pressure state of water. The mass transfer efficiency can realize the combustion reaction of the substance in contact with oxygen in water. On this basis, a wet oxidation process (also known as supercritical water oxidation process) is 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 liquid treatment, etc. .

[0003] However, the above-mentioned advanced wastewater treatment method of the wet oxidation process also has some shortcomings. For example, si...

Examples

Embodiment 1

[0025] like figure 1 The shown kind of pretreatment air flotation device includes an air flotation box 8, the air flotation box 8 has an air flotation contact area and a separation area, and a dissolved air releaser 16 is installed in the air flotation contact area, and the dissolved air releaser 16 passes through the trachea. Connected to the dissolved gas tank 15 . A slag scraper 9 is installed on the upper part of the air flotation box 8. A slag discharge groove 10 is installed in front of the slag scraper 9, and a drainage guide plate 12 is installed in the air flotation box 8 below the slag discharge groove 10, and the drainage guides A water flow channel is provided between the plate 12 and the bottom plate of the air flotation box 8 . The air flotation box 8 is provided with a drain pipe 11 and a return water pipe 13 connected to the dissolved air tank 15 , and a circulating pump 14 is installed on the return water pipe 13 .

[0026] The water inlet of the air flotati...

Embodiment 2

[0036] Embodiment 2——Microwave normal 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 sedimentation inclined plate 7 in the pretreatment air flotation device is 65 degrees; other features are the same as those in Example 1.

[0039] figure 2 In the microwave oxidation reactor, the end of the air inlet pipe below the liquid level in the reactor was 100 mm away from the liquid level in the reactor, and the diameter of the micropore was 6 mm; other features were the same as in Example 1.

[0040] With maleic anhydride wastewater as the wastewater to be treated, the method of the present invention is used 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 the suspended matter in step A into a m...

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 a supercritical state in the solid-liquid-gas three states of water through research on the high-temperature and high-pressure state of water. The mass transfer efficiency can realize the combustion reaction of the substance in contact with oxygen in water. On this basis, a wet oxidation process (also known as supercritical water oxidation process) is 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 liquid treatment, etc. .

[0003] However, the above-mentioned advanced wastewater treatment method of the wet oxidation process also has some shortcomings. For example, si...

Examples

Embodiment 1

[0025] like figure 1 The shown kind of pretreatment air flotation device includes an air flotation box 8, the air flotation box 8 has an air flotation contact area and a separation area, and a dissolved air releaser 16 is installed in the air flotation contact area, and the dissolved air releaser 16 passes through the trachea. Connected to the dissolved gas tank 15 . A slag scraper 9 is installed on the upper part of the air flotation box 8. A slag discharge groove 10 is installed in front of the slag scraper 9, and a drainage guide plate 12 is installed in the air flotation box 8 below the slag discharge groove 10, and the drainage guides A water flow channel is provided between the plate 12 and the bottom plate of the air flotation box 8 . The air flotation box 8 is provided with a drain pipe 11 and a return water pipe 13 connected to the dissolved air tank 15 , and a circulating pump 14 is installed on the return water pipe 13 .

[0026] The water inlet of the air flotati...

Embodiment 2

[0036] Embodiment 2——Microwave normal 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 sedimentation inclined plate 7 in the pretreatment air flotation device is 65 degrees; other features are the same as those in Example 1.

[0039] figure 2 In the microwave oxidation reactor, the end of the air inlet pipe below the liquid level in the reactor was 100 mm away from the liquid level in the reactor, and the diameter of the micropore was 6 mm; other features were the same as in Example 1.

[0040] With maleic anhydride wastewater as the wastewater to be treated, the method of the present invention is used 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 the suspended matter in step A into a m...

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