Adding device for removing 2-MIB and geosmin in raw water through combination of ozone and hydrogen peroxide

Abstract

The utility model provides a feeding device for removing 2-MIB and geosmin in raw water through combination of ozone and hydrogen peroxide, which comprises a first ozone feeding area, a hydrogen peroxide feeding area and a second ozone feeding area which are sequentially communicated through a water inlet pipeline, and ozone is directly fed into the water inlet pipeline by the first ozone feeding area; the hydrogen peroxide adding area is used for directly adding a hydrogen peroxide solution into the water inlet pipeline; the second ozone adding area is a water distribution well arranged above the water inlet pipeline, the bottom of the water distribution well is communicated with the water inlet pipeline, the water distribution well is provided with a water-stop sheet with a sealed bottom and an overflow port at the top along the circumferential direction of a water inlet, the water-stop sheet divides the water distribution well into an inner area and an outer area, and the inner area and the outer area are respectively provided with a plurality of ozone aeration devices close to the bottom; the outer area needs to be filled with water before use, and a water outlet is formed in the circumferential bottom of the outer area. According to the scheme, 2-MIB and geosmin in raw water can be removed through combination of ozone and hydrogen peroxide by utilizing an existing structure, no reaction equipment needs to be additionally arranged, and transformation can be achieved without cutting off water.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water treatment, specifically relates to a kind of ozone hydrogen peroxide combination dispelling 2-MIB and geosmin in raw water dosing device. BACKGROUND

[0002] 2-MIB and geosmin in raw water are the chemical substances that produce unpleasant odor in raw water treatment process, and are one of the chemical substances that are difficult to remove. The traditional water treatment method mostly adopts ozone activated carbon advanced treatment process, and the 2-MIB and geosmin in raw water are oxidized by ozone and adsorbed by activated carbon, so as to carry out deodorization treatment on raw water. In the ozone activated carbon advanced treatment process, ozone needs to react with organic matter in water, but this reaction is not always complete. Sometimes, ozone will have higher consumption, especially when treating complex raw water, a higher ozone dosage may be required. At the same time, although the oxidation ability of ozone is strong, compared with the combination of hydroxyl radicals, the efficiency of ozone in degrading some types of organic matter (such as toxic organic matter) is slightly lower, and residues often occur. Therefore, in this process, the raw water treated by ozone needs the physical adsorption of activated carbon as a supplement. However, the adsorption capacity of activated carbon is limited, and needs to be replaced or regenerated regularly. The adsorbed molecular particle size is large, and it is easy to be saturated, and pollutants are easy to remain. The traditional ozone activated carbon advanced treatment process is suitable for occasions that need to remove large molecular weight, colored substances in water, and pollutants are easy to escape.

[0003] In the ozone activated carbon advanced treatment process, the oxidation of ozone may produce some incomplete oxidation by-products, such as bromate, due to incomplete reaction. These by-products need to be further removed by other processes, so sometimes more complex subsequent treatment may be required.

[0004] In addition, when building a water treatment plant, ozone activated carbon advanced treatment process needs to add ozone contact tank and biological activated carbon filter, which involves long construction period, large occupation, and needs to stop water. And the use cost of activated carbon is relatively high, and the operation and maintenance are relatively complicated.

[0005] In order to optimize the deodorization process, the ozone hydrogen peroxide process in water treatment is introduced as a deodorization process. Hydrogen peroxide can provide hydroxyl radicals to enhance the ozone oxidation capacity, help ozone degrade quickly in water, reduce ozone consumption, make ozone oxidation tend to be complete, and use more efficiently. Hydrogen peroxide itself can also be consumed as an oxidizing agent, thereby reducing the use of excess ozone. Due to the generation of a large number of hydroxyl radicals, ozone oxidation tends to be complete, and the by-products are relatively simple, usually water and oxygen, which are relatively harmless and have less impact on the environment. The advantages of ozone hydrogen peroxide process mainly lie in enhanced oxidative degradation capacity, lower ozone consumption, less by-product generation and wider applicability, especially suitable for treating refractory organic matter.

[0006] However, the ozone hydrogen peroxide combined water treatment method is generally arranged at the front end of water treatment and has not been used in the deodorization process. If the ozone hydrogen peroxide combined equipment used in other water treatment stages is simply moved to the removal process of 2-MIB and geosmin components in raw water, a very large amount of engineering and complex modification will be required, and the capital cost is huge. For example, the Chinese invention patent with publication number CN 106115975 A discloses an ozone-hydrogen peroxide combined treatment device and process for papermaking wastewater, which requires multiple large reactors in the process, has a complex structure, high construction cost, long construction period, limited water treatment capacity, cannot use the original water treatment equipment on site, and cannot adapt to the large water deodorization capacity requirement of the sewage treatment plant.

[0007] In view of the above defects, the utility model creator finally obtains the utility model after a long time of research and practice. SUMMARY

[0008] To solve the above problems, the utility model provides a kind of ozone hydrogen peroxide combined device for removing 2-MIB and geosmin in raw water, the dosing device includes first ozone dosing area, hydrogen peroxide dosing area and second ozone dosing area communicated by water inlet pipeline in sequence, the first ozone dosing area is arranged on water inlet pipeline, and reaction tank is not set, and ozone is directly dosed into water inlet pipeline;The hydrogen peroxide dosing area is arranged on the water inlet pipeline, and the reaction tank is not set, and the hydrogen peroxide solution is directly dosed into the water inlet pipeline;The second ozone dosing area is a water distribution well arranged above the water inlet pipeline, the bottom of the water distribution well is communicated with the water inlet pipeline, the water distribution well is provided with a waterproof plate with bottom sealing and overflow port arranged at the top along the circumference of water inlet, the waterproof plate separates the water distribution well into inner area and outer area, and one or more ozone aeration devices are arranged in the inner area and outer area close to the bottom respectively;The outer area needs to be filled with water before use, and the outer area is provided with a water outlet along the circumference.

[0009] The present scheme adopts the method of ozone and hydrogen peroxide combination to remove 2-MIB and geosmin in raw water for deodorization treatment of raw water. In the present scheme, ozone is added twice. The first addition is pre-oxidation treatment of water body to reduce the consumption of hydrogen peroxide oxidation by a large amount of reducing substances, and to ensure that 2-MIB and geosmin can be completely oxidized after the superposition of the second ozone, improve the deodorization efficiency, and reduce the by-products. Hydrogen peroxide is added after the first addition of ozone to increase the number of hydroxyl radicals in the pipeline, so that the raw water flowing into the distribution well of the second ozone oxidation has a large number of hydroxyl radicals, further improving the deodorization efficiency of ozone oxidation. The setting mode of adding hydrogen peroxide before and after the two ozone additions greatly improves the deodorization efficiency of ozone compared with the deodorization efficiency of ozone activated carbon process.

[0010] The first ozone addition and hydrogen peroxide addition are completed in the pipeline, which can be directly installed on the existing plant equipment, and the operation is fast and the construction period is very short. The second ozone addition zone is set in the distribution well, and the water overflows from the bottom to the two sides, and the ozone aeration port is set in the bottom, and the inside and outside are provided with ozone aeration ports, which further increases the contact time of ozone and water, and the structure is simple, the construction is simple but the reaction efficiency is high.

[0011] As a preferred, a pipeline mixer is arranged between the hydrogen peroxide addition zone and the second ozone addition zone.

[0012] The pipeline mixer arranged between the hydrogen peroxide addition zone and the second ozone addition zone can mix the first added ozone, hydrogen peroxide and raw water completely, and ensure the reaction efficiency after the third addition.

[0013] As a preferred, the first ozone addition zone mixes ozone and water through a water jet arranged in the pipeline. The water jet is a common gas-liquid mixing device in the pipeline, which has high cost performance and is convenient to construct. Compared with other ozone aeration methods, the water jet can well complete the addition of ozone.

[0014] As a preferred, the hydrogen peroxide addition zone is added by a hydrogen peroxide solution addition pump. The addition of the hydrogen peroxide solution through the addition pump on the pipeline can realize efficient pipeline addition of the solution.

[0015] As a preferred, the water outlet is provided with a plurality of water outlets. The plurality of water outlets can improve the efficiency of water treatment.

[0016] When the ozone and hydrogen peroxide combination process is used in the deodorization process, the existing structure can be used, large-scale engineering reaction equipment does not need to be additionally added, and the transformation can be realized without stopping water. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. First ozone dosing zone; 2. Hydrogen peroxide dosing zone; 3. Dosing pump; 4. Pipeline mixer; 5. Water distribution well; 6. Ozone aeration device; 7. Water jet; 8. Inner zone; 9. Outer zone; 10. Water baffle. Detailed Implementation

[0020] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1 As shown, in this embodiment, an ozone injector 7 and a hydrogen peroxide pump 3 are sequentially installed on the pipeline through which the raw water flows to perform the first ozone injection and hydrogen peroxide solution injection on the water in the pipeline. When the raw water flows through the pipeline, the ozone injector 7 is installed on the pipeline to inject ozone, and then the hydrogen peroxide solution injection pump 3 is installed to inject hydrogen peroxide into the water in the pipeline. After the injection is completed, the water flows into the pipeline mixer 4 to promote the uniform mixing of the injected reagent and the water.

[0023] A distribution well 5 is installed after the pipeline mixer. The bottom of the distribution well 5 is connected to the pipeline. The distribution well is equipped with a bottom seal along the circumference of the inlet and a baffle plate 10 with an overflow outlet at the top. The baffle plate 10 divides the distribution well into an inner zone 8 and an outer zone 9. One or more ozone aeration devices 6 are respectively installed near the bottom of the inner zone 8 and the outer zone 9. The outer zone 9 has an outlet on its circumference. Raw water with added ozone and hydrogen peroxide enters the inner zone of the distribution well from the bottom after mixing. The ozone aeration devices installed near the bottom of the inner zone add ozone to the water. The inlet water pressure continuously pushes the water into the inner zone of the distribution well. After passing through the aeration zone, it overflows upwards to the outer zone through the overflow outlet. The outer zone is filled with water before use. The outlet of the water is located at the bottom of the overflow zone. The overflowing water flows from top to bottom through the entire outer zone. After being further mixed with ozone by the ozone aeration devices installed in the outer zone, it is discharged from the outlet. To ensure flow rate, in this embodiment, two outlets are provided on the opposite side of the outer zone. The entire process ensures sufficient contact with ozone. The addition of hydrogen peroxide increases the content of hydroxyl radicals, which enhance ozone oxidation, thus guaranteeing a complete oxidation reaction.

[0024] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A dosing device for removing 2-MIB and geosmin from raw water using a combination of ozone and hydrogen peroxide, characterized in that: The adding device comprises a first ozone adding area (1), a hydrogen peroxide adding area (2) and a second ozone adding area arranged in sequence through the water inlet pipeline communication, The first ozone adding area is arranged on the water inlet pipeline without reaction tank, and ozone is directly added into the water inlet pipeline; The hydrogen peroxide adding area is arranged on the water inlet pipeline without reaction tank, and hydrogen peroxide solution is directly added into the water inlet pipeline; The second ozone adding area is a water distribution well (5) arranged above the water inlet pipeline, the bottom of the water distribution well (5) is communicated with the water inlet pipeline, the water distribution well (5) is circumferentially provided with a water stop plate (10) with an overflow port at the top at the bottom, the water stop plate (10) divides the water distribution well (5) into an inner area (8) and an outer area (9), and one or more ozone aeration devices (6) are arranged in the inner area (8) and the outer area (9) near the bottom respectively; The outer area (9) needs to be filled with water before use, and the outer area (9) is circumferentially provided with a water outlet at the bottom.

2. The dosing device for removing 2-MIB and geosmin in raw water by ozone and hydrogen peroxide combination according to claim 1, characterized in that: The hydrogen peroxide adding area (2) and the second ozone adding area are provided with a pipeline mixer (4) therebetween.

3. The dosing device for removing 2-MIB and geosmin in raw water by using ozone and hydrogen peroxide according to claim 1, characterized in that: The first ozone adding area (1) mixes ozone and water through a water jet (7) arranged in the pipeline.

4. The dosing device for removing 2-MIB and geosmin in raw water by ozone and hydrogen peroxide combination according to claim 1, characterized in that: The hydrogen peroxide adding area is added by a hydrogen peroxide solution adding pump (3).

5. The dosing device for removing 2-MIB and geosmin in raw water by using ozone and hydrogen peroxide according to claim 1, characterized in that: The water outlet is provided with a plurality of water outlets.

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