Wastewater treatment method, device and system based on ozone and hydrogen peroxide

Abstract

The embodiment of the invention relates to a wastewater treatment method, device and system based on ozone and hydrogen peroxide, and the method comprises the following steps: pre-treating received wastewater to be treated, and introducing hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture; first mixing and second mixing are carried out on the first intermediate mixture, the mixed first intermediate mixture is introduced into the reactor for full reaction, a first reaction product is obtained, and the first reaction product at least comprises first reaction liquid; and discharging the first reaction liquid contained in the first reaction product in response to the condition that the first reaction liquid meets the wastewater discharge requirement. According to the embodiment of the invention, the wastewater to be treated can be fully mixed and reacted with the hydrogen peroxide and the ozone introduced into the wastewater, so that the utilization rate of the hydrogen peroxide and the ozone is improved, and meanwhile, the generation and utilization rate of hydroxyl radicals is also improved.

Description

Technical Field

[0001] Embodiments of the present invention generally relate to the field of wastewater treatment, and more specifically, to a wastewater treatment method, device and system based on ozone and hydrogen peroxide. Background Art

[0002] Hydroxyl radicals are increasingly used in wastewater treatment due to their strong oxidizing properties to oxidize and decompose organic pollutants in wastewater. Commonly, ozone (O3) and hydrogen peroxide (H2O2) can be used to generate hydroxyl radicals to remove organic pollutants in wastewater.

[0003] However, existing wastewater treatment schemes based on ozone and hydrogen peroxide have shortcomings such as low ozone utilization rate and insufficient production and utilization of hydroxyl radicals. Summary of the invention

[0004] In view of the above problems, the present invention provides a wastewater treatment method, device and system based on ozone and hydrogen peroxide, so that the wastewater to be treated and the hydrogen peroxide and ozone introduced therein can be fully mixed and reacted, thereby improving the utilization rate of hydrogen peroxide and ozone, and also improving the generation and utilization rate of hydroxyl radicals.

[0005] According to a first aspect of the present invention, there is provided a wastewater treatment method based on ozone and hydrogen peroxide, comprising: pre-treating received wastewater to be treated, and introducing hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture; performing first mixing and second mixing on the first intermediate mixture, and introducing the mixed first intermediate mixture into a reactor for sufficient reaction to obtain a first reaction product, the first reaction product comprising at least a first reaction liquid; and discharging the first reaction liquid included in the first reaction product in response to the first reaction liquid satisfying the wastewater discharge requirement.

[0006] In some embodiments, pre-treating the received wastewater to be treated and introducing hydrogen peroxide and ozone into the wastewater to be treated includes: roughly adjusting the received wastewater to be treated so that the pH value of the wastewater to be treated meets a first predetermined condition; introducing hydrogen peroxide into the roughly adjusted wastewater to be treated; fine-adjusting the wastewater to be treated after the hydrogen peroxide is introduced so that the pH value of the wastewater to be treated meets a second predetermined condition; and introducing ozone into the finely adjusted wastewater to be treated to obtain a first intermediate mixture.

[0007] In some embodiments, the first predetermined condition includes: the pH value of the wastewater to be treated is in the range of 7 to 8. In some embodiments, the second predetermined condition includes: the pH value of the wastewater to be treated is in the range of 8 to 8.5.

[0008] In some embodiments, the concentration of hydrogen peroxide ranges from 25% to 35%, and the concentration of ozone ranges from 5% to 15%.

[0009] In some embodiments, performing the first mixing and the second mixing on the first intermediate mixture includes: performing the first mixing on the first intermediate mixture using a gas-liquid mixing pump; and performing the second mixing on the first intermediate mixture that has been first mixed using a rotary mixer.

[0010] In some embodiments, a plurality of pipes are provided inside the reactor, and the diameter of each pipe is varied. In these embodiments, passing the mixed first intermediate mixture into the reactor for sufficient reaction comprises: passing the mixed first intermediate mixture into the plurality of pipes through the upper portion of the reactor, and reaching the bottom of the reactor through the plurality of pipes, so that the mixed first intermediate mixture is fully reacted in the plurality of pipes.

[0011] In some embodiments, discharging the first reaction liquid included in the first reaction product includes: performing gas-liquid separation on the first reaction product to obtain a first reaction gas and a first reaction liquid; determining whether the first reaction liquid meets wastewater discharge requirements; in response to the first reaction liquid meeting the wastewater discharge requirements, discharging the first reaction liquid; and catalytically heating the first reaction gas to discharge the catalytically heated first reaction gas.

[0012] According to a second aspect of the present invention, there is provided a wastewater treatment device based on ozone and hydrogen peroxide, comprising: a feeding module, configured to pre-treat the received wastewater to be treated, and to introduce hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture; a mixing module, connected to the feeding module, to receive the first intermediate mixture from the feeding module, wherein the feeding module is configured to perform a first mixing and a second mixing on the first intermediate mixture; a reaction module, connected to the mixing module, wherein the reaction module is configured to receive the mixed first intermediate mixture from the mixing module and perform a sufficient reaction to obtain a first reaction product, the first reaction product at least comprising a first reaction liquid; and a discharge module, connected to the reaction module, to at least discharge the first reaction liquid included in the first reaction product when the first reaction liquid meets the wastewater discharge requirement.

[0013] In some embodiments, the feeding module includes: a first feeding unit, configured to: receive the wastewater to be treated and a first reagent for adjusting the pH of the wastewater to be treated, and based on the first reagent, perform rough adjustment on the received wastewater to be treated; a second feeding unit, arranged downstream of the first feeding unit, and configured to pass hydrogen peroxide into the roughly adjusted wastewater to be treated; a third feeding unit, arranged downstream of the second feeding unit, and configured to: receive a second reagent for adjusting the pH of the wastewater to be treated, and based on the second reagent, perform fine adjustment on the received wastewater to be treated; and a fourth feeding unit, arranged downstream of the third feeding unit, and configured to pass ozone into the finely adjusted wastewater to be treated.

[0014] In some embodiments, the mixing module includes a first mixer and a second mixer connected in sequence, wherein the first mixer is a gas-liquid mixing pump configured to perform a first mixing on the first intermediate mixture; the second mixer is a rotary mixer configured to perform a second mixing on the first intermediate mixture that has undergone the first mixing.

[0015] In some embodiments, the reaction module includes a reactor, wherein a plurality of pipes are disposed inside the reactor, and the diameter of each pipe varies.

[0016] In some embodiments, baffles are disposed inside the reactor.

[0017] In some embodiments, the exhaust module includes: a gas-liquid separator configured to perform gas-liquid separation on the first reaction product to obtain a first reaction gas and a first reaction liquid; and an ozone decomposer configured to perform catalytic heating on the first reaction gas to decompose ozone in the first reaction gas into oxygen.

[0018] In some embodiments, the feeding module further includes: a circulation tank, wherein a first inlet of the circulation tank is connected to an outlet of the first feeding unit, a second inlet of the circulation tank is connected to an outlet of the reaction module, and a first outlet of the circulation tank is connected to an inlet of the second feeding unit.

[0019] According to a third aspect of the present invention, there is provided a wastewater treatment system based on ozone and hydrogen peroxide, comprising: a wastewater treatment device according to the second aspect of the present invention; and a control unit for controlling the wastewater treatment device to perform the steps of the wastewater treatment method according to the first aspect of the present invention.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, advantages and aspects of the embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements.

[0022] Figure 1 A flow chart of a wastewater treatment method based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown.

[0023] Figure 2 A schematic diagram of a wastewater treatment device based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown.

[0024] Figure 3 A schematic diagram of a feed module according to an embodiment of the present invention is shown.

[0025] Figure 4 A schematic diagram of a reactor according to an embodiment of the present invention is shown.

[0026] Figure 5 A schematic diagram of a wastewater treatment device based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown.

[0027] Figure 6 A schematic diagram of a wastewater treatment system based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0029] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0030] Advanced Oxidation Process (AOP) is a technology that generates hydroxyl radicals (·OH) through reactions and uses the generated hydroxyl radicals for oxidation. Since hydroxyl radicals have strong oxidizing properties, when hydroxyl radicals react with organic matter, they can effectively decompose organic matter into inorganic matter, such as water (H2O), carbon dioxide (CO2), etc. Therefore, advanced oxidation treatment technology using hydroxyl radicals is increasingly widely used in the field of wastewater treatment to decompose organic pollutants in wastewater.

[0031] In the field of wastewater treatment, common advanced oxidation treatment processes may include: wet oxidation, Fenton oxidation, ozone oxidation, ozone hydrogen peroxide oxidation, etc. Among them, the ozone hydrogen peroxide oxidation method utilizes the synergistic effect of ozone (O3) and hydrogen peroxide (also known as hydrogen peroxide, H2O2), and generates hydroxyl radicals (see the following formula (1)) by introducing ozone and hydrogen peroxide into the wastewater, so that the generated hydroxyl radicals can be used to effectively remove organic pollutants in the wastewater.

[0032] H2O2 + 2O3 = 2(·OH) + 3O2 (1)

[0033] Generally, the above-mentioned oxidation treatment process based on ozone and hydrogen peroxide needs to be carried out under alkaline conditions. However, hydrogen peroxide is unstable and easily decomposed under alkaline conditions, and ozone has a low solubility in water, which limits the generation of hydroxyl radicals. In addition, due to the low solubility of ozone in water, ozone is easy to overflow from the solution, resulting in a low utilization rate of ozone.

[0034] In addition, although ozone is more likely to produce hydroxyl radicals in the presence of hydrogen peroxide, since the half-life of hydroxyl radicals is very short, that is, the activity of hydroxyl radicals is very strong, the generated hydroxyl radicals need to react immediately with organic pollutants dissolved in the wastewater, otherwise the generated hydroxyl radicals will be wasted.

[0035] Therefore, in order to at least improve the utilization rate of ozone and improve the generation and utilization rate of hydroxyl radicals, an exemplary embodiment of the present invention provides a wastewater treatment method, device and system based on ozone and hydrogen peroxide, by pre-treating the received wastewater to be treated, and introducing hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture; performing a first mixing and a second mixing on the first intermediate mixture, and introducing the mixed first intermediate mixture into a reactor for sufficient reaction to obtain a first reaction product, the first reaction product at least including a first reaction liquid; and in response to the first reaction product meeting the discharge requirements, discharging the first reaction liquid included in the first reaction product, so that the wastewater to be treated and the hydrogen peroxide and ozone introduced therein can be fully mixed and reacted, thereby improving the utilization rate of hydrogen peroxide and ozone, and also improving the generation and utilization rate of hydroxyl radicals.

[0036] The following will be combined Figures 1 to 6 A wastewater treatment scheme based on ozone and hydrogen peroxide according to an embodiment of the present invention is described in detail.

[0037] Figure 1 The flowchart of the wastewater treatment method 100 based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown. It should be understood that the method 100 may also include additional actions not shown and / or may omit the actions shown, and the scope of the present invention is not limited in this respect.

[0038] In step 102, the received wastewater to be treated is pretreated, and hydrogen peroxide and ozone are introduced into the wastewater to be treated to obtain a first intermediate mixture.

[0039] Regarding pretreatment, it may refer to treatment related to adjusting the pH value of the wastewater to be treated. According to an embodiment of the present invention, the pH value of the wastewater to be treated may be adjusted to meet a predetermined condition by introducing an appropriate acid reagent or alkaline reagent into the wastewater to be treated, for example, the pH value of the wastewater to be treated may fall within a predetermined numerical range, such as a pH value within a range of 8 to 8.5 (i.e., 8≤pH≤8.5).

[0040] According to an embodiment of the present invention, the pH value of the wastewater to be treated can be adjusted at one time so that the pH value of the wastewater to be treated is greater than or equal to 8 and less than or equal to 8.5. For example, the current pH value of the received wastewater to be treated can be determined first; in response to the wastewater to be treated being acidic, neutral or weakly alkaline (for example, the pH value of the wastewater to be treated is greater than 7 and less than 8), an alkaline reagent, such as liquid alkali, can be added to the wastewater to be treated so that the pH value of the adjusted wastewater to be treated is within the range of 8 to 8.5; in response to the wastewater to be treated being too alkaline (for example, the pH value of the wastewater to be treated is greater than or much greater than 8.5), an acidic reagent can be added to the wastewater to be treated to reverse the wastewater to be treated so that the pH value of the adjusted wastewater to be treated is within the range of 8 to 8.5.

[0041] However, as mentioned above, since hydrogen peroxide is easily decomposed under alkaline conditions, if the pH value of the wastewater to be treated is directly adjusted to a pH value within the range of 8 to 8.5, part of the hydrogen peroxide added subsequently will not have time to participate in the reaction with ozone, but will directly decompose into water and oxygen. Therefore, in order to fully utilize hydrogen peroxide to react with ozone to generate hydroxyl radicals, according to the inventive concept of the present invention, an acid reagent or an alkaline reagent can be introduced into the wastewater to be treated in batches, so that the pH value of the wastewater to be treated finally falls within the range of 8 to 8.5.

[0042] On this basis, according to the inventive concept of the present invention, hydrogen peroxide can be introduced into the wastewater to be treated between the two pH adjustments of the wastewater to be treated, and ozone can be introduced into the wastewater to be treated after the second pH adjustment is completed.

[0043] Specifically, according to some other embodiments of the present invention, pre-treating the received wastewater to be treated and introducing hydrogen peroxide and ozone into the wastewater to be treated may include: performing rough adjustment on the received wastewater to be treated so that the pH value of the wastewater to be treated meets a first predetermined condition; introducing hydrogen peroxide into the roughly adjusted wastewater to be treated; performing fine adjustment on the wastewater to be treated after the introduction of hydrogen peroxide so that the pH value of the wastewater to be treated meets a second predetermined condition; and introducing ozone into the finely adjusted wastewater to be treated to obtain a first intermediate mixture.

[0044] Regarding the first predetermined condition, it may mean that the pH value of the wastewater to be treated is in the range of 7 to 8.

[0045] Regarding the second predetermined condition, it may mean that the pH value of the wastewater to be treated is in the range of 8 to 8.5.

[0046] Regarding hydrogen peroxide, according to an embodiment of the present invention, its concentration range may be 25% to 35%, preferably, the concentration of hydrogen peroxide may be 27.5%. It should be understood that in an embodiment of the present invention, the amount of hydrogen peroxide introduced into the wastewater to be treated is related to the concentration of hydrogen peroxide. Generally, the higher the concentration of hydrogen peroxide, the less the amount of hydrogen peroxide introduced.

[0047] Regarding ozone, it may refer to ozone of a predetermined concentration generated by an ozone generator. According to an embodiment of the present invention, the concentration of ozone may range from 5% to 15%, preferably, from 8% to 12%. For example, in some embodiments, ozone with a concentration of 10% may be introduced into the wastewater to be treated.

[0048] For example, in some embodiments, a rough adjustment is performed on the received wastewater to be treated by adding an acid reagent or an alkaline reagent to the wastewater to be treated so that the pH value of the wastewater to be treated falls within the range of 7 to 8; hydrogen peroxide with a concentration of, for example, 27.5% is passed into the roughly adjusted wastewater to be treated; fine-adjustment is performed on the wastewater to be treated after the hydrogen peroxide is passed through by adding an alkaline reagent (such as liquid caustic soda) thereto so that the pH value of the wastewater to be treated falls within the range of 8 to 8.5; and ozone with a concentration of, for example, 10% is passed into the finely adjusted wastewater to be treated to obtain a first intermediate mixture.

[0049] Regarding the first intermediate mixture, it may refer to a mixture formed by at least the wastewater to be treated, hydrogen peroxide and ozone. For example, the first intermediate mixture may include: the wastewater to be treated with a pH value in the range of 8 to 8.5, a hydrogen peroxide concentration of 27.5% and an ozone concentration of 10%. In some embodiments, the first intermediate mixture may also include reagents added when performing rough adjustment and / or fine adjustment on the wastewater to be treated, such as liquid caustic soda.

[0050] As can be seen from the above, the present invention sequentially performs the following steps on the received wastewater to be treated: 1) roughly adjusting the pH value of the wastewater to be treated; 2) introducing hydrogen peroxide into the wastewater to be treated; 3) finely adjusting the pH value of the wastewater to be treated; and 4) introducing ozone into the wastewater to be treated, thereby reducing the amount of hydrogen peroxide decomposed due to the alkalinity of the wastewater to be treated, thereby reducing the amount of hydrogen peroxide used in the wastewater treatment process, improving the utilization rate of hydrogen peroxide, and allowing hydrogen peroxide to better participate in the reaction with ozone.

[0051] Further, in response to obtaining the first intermediate mixture at step 102, in step 104, first mixing and second mixing are performed on the first intermediate mixture, and the mixed first intermediate mixture is introduced into a reactor for sufficient reaction to obtain a first reaction product.

[0052] Regarding the first mixing, according to an embodiment of the present invention, it may refer to mixing performed by, for example, a mixing pump. For example, in an embodiment of the present invention, a gas-liquid mixing pump with an impeller may be used to perform the first mixing on the first intermediate mixture obtained at step 102, so that the wastewater to be treated, hydrogen peroxide, and ozone in the first intermediate mixture are fully mixed.

[0053] Regarding the second mixing, according to an embodiment of the present invention, it may refer to mixing based on a rotational mixing mechanism. For example, in an embodiment of the present invention, a rotary mixer may be used to perform a second mixing on the first intermediate mixture after the first mixing, so that the first intermediate mixture is mixed more fully.

[0054] As described above, the present invention forces the wastewater to be treated, hydrogen peroxide and ozone to be mixed twice, so that hydrogen peroxide and ozone can react better to generate hydroxyl radicals, and ozone can repeatedly contact with water in the first intermediate mixture, thereby improving the utilization rate of ozone.

[0055] Regarding the reactor, it may refer to a reactor for oxidizing organic pollutants in wastewater. According to an embodiment of the present invention, a plurality of pipes may be provided inside the reactor, and the first intermediate mixture including the wastewater to be treated may enter the plurality of pipes through the upper part of the reactor and reach the bottom of the reactor through these pipes. In the process of flowing through these pipes, the hydroxyl radicals generated by the mixing may collide with the wastewater to be treated to oxidize the organic pollutants in the wastewater to be treated.

[0056] In order to make the hydroxyl radicals collide better with the wastewater to be treated, according to the inventive concept of the present invention, the diameter of the pipes arranged inside the reactor is variable, so that the flow rate of the first intermediate mixture including the wastewater to be treated when flowing through these pipes can change with the change of the pipe diameter, thereby making the hydroxyl radicals react better with the organic pollutants in the wastewater to be treated.

[0057] Regarding the first reaction product, according to an embodiment of the present invention, it may refer to the reaction product obtained after the first intermediate mixture is oxidized in a reactor. In an example of the present invention, the first reaction product may include, but is not limited to: wastewater from which organic pollutants have been removed by oxidation; oxygen that has not been completely reacted; some unused ozone; and gases such as carbon dioxide and nitrogen oxides obtained by oxidizing hydrogen peroxide, ozone, hydroxyl radicals and organic matter in the wastewater to be treated.

[0058] In step 106 , in response to the first reaction liquid included in the first reaction product satisfying a wastewater discharge requirement, the first reaction liquid is discharged.

[0059] According to the inventive concept of the present invention, the first reaction product can then be subjected to solid-liquid separation to obtain at least treated wastewater that meets the discharge requirements, and the treated wastewater is discharged. Specifically, according to an embodiment of the present invention, discharging the first reaction product may include: performing gas-liquid separation on the first reaction product to obtain a first reaction gas and a first reaction liquid; determining whether the first reaction liquid meets the wastewater discharge requirements; in response to the first reaction liquid meeting the wastewater discharge requirements, discharging the first reaction liquid; and catalytically heating the first reaction gas to discharge the catalytically heated first reaction gas.

[0060] Regarding the first reaction liquid, according to an embodiment of the present invention, it may include wastewater oxidized by ozone hydrogen peroxide. Specifically, the first reaction liquid may refer to wastewater from which organic pollutants are removed by oxidation and included in the first reaction product.

[0061] According to an embodiment of the present invention, it can be determined whether to exclude the first reaction liquid based on the wastewater discharge requirements. For example, in some embodiments, it is determined whether the first reaction liquid meets the wastewater discharge requirements; in response to the first reaction liquid meeting the wastewater discharge requirements, the first reaction liquid is discharged; or in response to the first reaction liquid not meeting the wastewater discharge requirements, the first reaction liquid is re-oxidized to further remove organic pollutants therein, for example, hydrogen peroxide and ozone can be re-introduced into the first reaction liquid, and the above operations are performed, which will not be repeated here.

[0062] Regarding the first reaction gas, according to an embodiment of the present invention, it may include: oxygen, ozone, carbon dioxide, nitrogen oxides and other gases.

[0063] As mentioned above, since the first reaction gas includes ozone, according to the inventive concept of the present invention, the first reaction gas can also be catalytically heated before being discharged, so that the ozone in the first reaction gas is decomposed into oxygen, and then the catalytically heated first reaction gas is discharged, thereby avoiding the damage of ozone to the atmospheric environment.

[0064] In addition, those skilled in the art should understand that the wastewater discharge requirements here may refer to standards for wastewater discharge such as those specified by the state or relevant departments or regions, or may be wastewater discharge reference standards set by enterprises based on actual production needs, and the present invention is not limited to this.

[0065] In summary, the wastewater treatment method based on ozone and hydrogen peroxide provided by the present invention can enable the wastewater to be treated and the hydrogen peroxide and ozone introduced therein to be fully mixed and reacted, thereby improving the utilization rate of hydrogen peroxide and ozone, and also improving the generation and utilization rate of hydroxyl radicals.

[0066] Based on the above wastewater treatment method based on ozone and hydrogen peroxide, the present invention also provides a wastewater treatment device based on ozone and hydrogen peroxide. Figure 2 and Figure 4 Detailed description.

[0067] Figure 2 A schematic diagram of a wastewater treatment device 200 based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown. It should be understood that the wastewater treatment device 200 may also include additional modules not shown and / or may omit the modules shown, and the scope of the present invention is not limited in this respect.

[0068] like Figure 2 As shown, the wastewater treatment device 200 includes: a feed module 210 , a mixing module 220 , a reaction module 230 , and a discharge module 240 .

[0069] Regarding the feed module 210, it can be configured to receive wastewater to be treated, an oxidant, a reagent for adjusting the pH value, etc. According to an embodiment of the present invention, the feed module 210 can be configured to receive wastewater to be treated, a reagent for adjusting the pH value of the wastewater to be treated, hydrogen peroxide, and ozone. Further, in an embodiment of the present invention, the feed module 210 can be configured to: pre-treat the received wastewater to be treated based at least on the received reagent for adjusting the pH value of the wastewater to be treated, and introduce hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture. Regarding the structure of the feed module 210, reference will be made below. Figure 3 I will not go into the details here.

[0070] The first intermediate mixture may refer to a mixture formed by at least wastewater to be treated, hydrogen peroxide and ozone.

[0071] Regarding the mixing module 220 , it may be in communication with the feeding module 210 to receive the first intermediate mixture from the feeding module 210 .

[0072] like Figure 2 As shown, the mixing module 220 further includes a first mixer 222 and a second mixer 224 connected in sequence, so that the mixing module 220 can use the first mixer 222 and the second mixer 224 to perform the first mixing and the second mixing on the received first intermediate mixture.

[0073] Regarding the first mixer 222 , according to an embodiment of the present invention, it may be a gas-liquid mixing pump. In an embodiment of the present invention, the first mixer 222 may be configured to perform a first mixing on the first intermediate mixture received from the feed module 210 .

[0074] The second mixer 224 may be a rotary mixer according to an embodiment of the present invention. In an embodiment of the present invention, the second mixer 224 may be configured to perform a second mixing on the first intermediate mixture that has been first mixed.

[0075] Regarding the reaction module 230, it can be connected to the mixing module 220 to receive the first intermediate mixture after the two mixings. Specifically, according to an embodiment of the present invention, the reaction module 230 can be configured to: fully react the received first intermediate mixture after the mixing to obtain a first reaction product.

[0076] According to an embodiment of the present invention, the reaction module 230 may further include a reactor for allowing the hydroxyl radicals generated by the hydrogen peroxide and the ozone to fully collide with the wastewater to be treated to oxidize the organic pollutants in the wastewater to be treated. In order to allow the hydroxyl radicals to collide with the wastewater to be treated better, according to the inventive concept of the present invention, a plurality of pipes may be provided inside the reactor, and the diameter of each pipe is variable. Figure 4 Detailed description.

[0077] In addition, in order to allow the hydroxyl radicals to react with the wastewater to be treated for a longer time, thereby allowing the hydroxyl radicals to react more fully with the wastewater to be treated, a baffle may be provided inside the reactor. Figure 4 Detailed description.

[0078] Regarding the first reaction product, it may include but is not limited to: wastewater from which organic pollutants have been removed by oxidation; oxygen that has not reacted completely; some unused ozone; and gases such as carbon dioxide and nitrogen oxides obtained by oxidizing hydrogen peroxide, ozone, hydroxyl radicals and organic matter in the wastewater to be treated.

[0079] Regarding the discharge module 240 , according to an embodiment of the present invention, it may be connected to the reaction module 230 and configured to discharge the first reaction product received from the reaction module 230 .

[0080] Further, in order to ensure that the discharged first reaction products all meet the discharge requirements, according to the inventive concept of the present invention, the discharge module 240 may further include a gas-liquid separator (not shown) and an ozone decomposer (not shown).

[0081] As for the gas-liquid separator, it may be configured to perform gas-liquid separation on the first reaction product to obtain a first reaction gas and a first reaction liquid.

[0082] As for the first reaction gas, as described above, the first reaction gas in the embodiment of the present invention may include: oxygen, ozone, carbon dioxide, nitrogen oxides and the like.

[0083] As for the ozone decomposer, it may be configured to perform catalytic heating on the first reaction gas to decompose ozone in the first reaction gas into oxygen.

[0084] Thus, the first reaction gas exhausted by the exhaust module 240 will not include ozone, thereby preventing ozone from damaging the atmospheric environment.

[0085] Figure 3 A schematic diagram of a feed module 300 according to an embodiment of the present invention is shown. It should be understood that the feed module 300 may further include additional modules not shown and / or the modules shown may be omitted, and the scope of the present invention is not limited in this respect.

[0086] like Figure 3 As shown, the feeding module 300 may include: a first feeding unit 301 , a second feeding unit 302 , a third feeding unit 303 and a fourth feeding unit 304 .

[0087] Regarding the first feeding unit 301, it can be used to roughly adjust the wastewater to be treated so that the pH of the wastewater to be treated meets the first predetermined condition. According to an embodiment of the present invention, the first feeding unit 301 can be configured to: receive the wastewater to be treated and a first reagent for adjusting the pH of the wastewater to be treated, and based on the first reagent, roughly adjust the received wastewater to be treated. In some embodiments, the first feeding unit 301 may include a feeding tank.

[0088] Regarding the first reagent, it can be any acid reagent or alkaline reagent suitable for adjusting the pH of the wastewater to be treated. For example, when the pH value of the wastewater to be treated is greater than 8, such as when the pH value is 9, the first reagent can be an acid reagent; when the pH value of the wastewater to be treated is less than 7, such as when the pH value is 6, the first reagent can be liquid alkali.

[0089] Regarding the second feeding unit 302, it can be used to pass hydrogen peroxide into the wastewater to be treated. According to an embodiment of the present invention, the second feeding unit 302 can be arranged downstream of the first feeding unit 301, and is configured to pass hydrogen peroxide into the roughly adjusted wastewater to be treated. In some embodiments, the second feeding unit 302 may include a hydrogen peroxide dosing device and a hydrogen peroxide mixer, so that hydrogen peroxide can be added to the hydrogen peroxide mixer via the hydrogen peroxide dosing device, and mixed with the roughly adjusted wastewater to be treated in the hydrogen peroxide mixer.

[0090] Regarding the third feeding unit 303, it can be used to fine-tune the wastewater to be treated so that the pH of the wastewater to be treated meets the second predetermined condition. According to an embodiment of the present invention, the third feeding unit 303 can be configured to: receive a second reagent for adjusting the pH of the wastewater to be treated, and fine-tune the received wastewater to be treated based on the second reagent.

[0091] Regarding the second reagent, according to an embodiment of the present invention, it may be liquid alkali.

[0092] In some embodiments, the third feeding unit 303 may include a liquid alkali dosing device and an acid-base mixer. In these embodiments, the liquid alkali can be added to the acid-base mixer via the liquid alkali dosing device to mix with the wastewater to be treated entering the acid-base mixer to obtain the finely adjusted wastewater to be treated with a pH value in the range of 8 to 8.5.

[0093] Regarding the fourth feeding unit 304, it can be used to pass ozone into the wastewater to be treated. According to an embodiment of the present invention, the fourth feeding unit 304 can be arranged downstream of the third feeding unit 303, and is configured to pass ozone into the finely adjusted wastewater to be treated. In some embodiments, the fourth feeding unit 304 may include: an ozone generator for generating ozone; and an ozone injector to add ozone to the finely adjusted wastewater to be treated by jetting.

[0094] like Figure 3 As shown, in some embodiments of the present invention, the feed module 300 may also optionally include a circulation tank 305 to return the wastewater that does not meet the discharge requirements after being oxidized with ozone and hydrogen peroxide to the treatment loop of the wastewater to be treated for re-oxidation with ozone and hydrogen peroxide.

[0095] like Figure 3 As shown, the circulation tank 305 may include at least: a first inlet, which is connected to the outlet of the first feeding unit 301; and a first outlet, which is connected to the inlet of the second feeding unit 302, so that, alternatively, the roughly adjusted wastewater to be treated obtained at the first feeding unit 301 can enter the circulation tank 305 through the first inlet, such as through a first pump (for example, a feeding pump), and then enter the second feeding unit 302 through the first outlet, such as through a second pump (for example, a circulation pump).

[0096] like Figure 3 As shown, the circulation tank 305 may also include at least: a second inlet for passing wastewater that has been oxidized with ozone and hydrogen peroxide but does not meet the discharge requirements into the circulation tank 305, so that the wastewater that does not meet the discharge requirements can be mixed with the roughly adjusted wastewater to be treated received from the first feeding unit 301, and passed together into the second feeding unit 302 for the addition of hydrogen peroxide.

[0097] According to some embodiments of the present invention, the second inlet of the circulation tank 305 can be connected to a discharge module (such as Figure 2 The outlet of the discharge module 240 is connected to the circulation tank 305 so as to return the first reaction liquid that has not met the discharge requirements after gas-liquid separation through the discharge module 240 to the circulation tank 305.

[0098] According to some further embodiments of the present invention, a discharge module (such as Figure 2 The discharge module 240 of the circulation tank 305 can be integrated in the circulation tank 305. In this case, the second inlet of the circulation tank 305 can be directly connected to the reaction module (such as Figure 2 The outlet of the reaction module 230 is connected, so that the first reaction product obtained at the reaction module 230 is directly passed into the circulation tank 305 for gas-liquid separation, and the first reaction liquid obtained by gas-liquid separation and meeting the emission requirements is discharged from the circulation tank 305, and the reaction liquid obtained by gas-liquid separation and not meeting the emission requirements is pumped to the second feeding unit 302 through the first outlet of the circulation tank 305 together with the roughly adjusted wastewater to be treated entering the circulation tank 305.

[0099] Figure 4 A schematic diagram of a reactor 400 according to an embodiment of the present invention is shown. It should be understood that the reactor 400 may also include additional modules not shown and / or the modules shown may be omitted, and the scope of the present invention is not limited in this respect.

[0100] like Figure 4 As shown, a plurality of pipes, such as three pipes, may be provided inside the reactor 400, and the diameter of each pipe is varied. According to an embodiment of the present invention, the first intermediate mixture introduced into the reactor 400 may enter the plurality of pipes through the upper portion of the reactor 400, and reach the bottom of the reactor through the plurality of pipes, so that the mixed first intermediate mixture is fully reacted in the plurality of pipes.

[0101] In an embodiment of the present invention, since the diameter of each pipe is variable, the flow state (i.e., flow rate) of the first intermediate mixture flowing therethrough can be physically changed through the pipe with varying diameter. In other words, in the reactor 400, the flow rate of the first intermediate mixture can change with the change of the pipe diameter. Thus, the pipe with varying diameter can assist the collision and interaction process between the hydroxyl radicals in the first intermediate mixture and the wastewater to be treated, so that the hydroxyl radicals can better react with the organic pollutants in the wastewater to be treated.

[0102] like Figure 4 As shown, a baffle may also be provided inside the reactor 400 to increase the reaction time of the first intermediate mixture in the reactor 400, so that the reaction time of the first intermediate mixture can be increased without changing the volume of the reactor 400, so that the hydroxyl radicals in the first intermediate mixture can fully react with the wastewater to be treated.

[0103] From the above, it can be seen that the reactor provided by the present invention significantly increases the contact probability between hydroxyl radicals and the wastewater to be treated by simultaneously arranging baffles and pipes with varying diameters inside the reactor, thereby enabling the hydroxyl radicals to fully react with the organic pollutants in the wastewater to be treated.

[0104] Further, in order to better illustrate the wastewater treatment scheme based on ozone and hydrogen peroxide provided by the present invention, the following will be combined with Figure 5 An exemplary wastewater treatment device 500 is shown, and an exemplary wastewater treatment method of the present invention is described in detail.

[0105] Figure 5 A schematic diagram of a wastewater treatment device 500 based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown. The wastewater treatment device 500 may further include additional modules not shown and / or may omit the modules shown, and the scope of the present invention is not limited in this respect.

[0106] like Figure 5 As shown, the wastewater treatment device 500 may include: a first feeding unit 510, a circulation tank 512, a second feeding unit 514, a third feeding unit 516, a fourth feeding unit 518, a first mixer 522, a second mixer 524 and a reactor 530. The first feeding unit 510, the circulation tank 512, the second feeding unit 514, the third feeding unit 516, the fourth feeding unit 518, the first mixer 522, the second mixer 524 and the reactor 530 are sequentially connected.

[0107] Furthermore, if Figure 5 As shown, a discharge module 540 is integrated in the circulation tank 512, and the circulation tank 512 includes multiple inlets, one of which is connected to the outlet of the reactor 530, so that the reactants received from the reactor 530 can enter the discharge module 540 integrated in the reactor 530 through the inlet.

[0108] Combination Figure 5 The wastewater treatment device 500 shown, according to an embodiment of the present invention, can perform an oxidation treatment based on ozone and hydrogen peroxide on the wastewater to be treated according to the following steps.

[0109] Step 5-1, passing the wastewater to be treated into the first feeding unit 510; determining the pH of the wastewater to be treated, and based on the determined pH of the wastewater to be treated, determining a first reagent for adjusting the pH of the wastewater to be treated; adding the determined first reagent to the first feeding unit 510 through an acid / base dosing device; based on the first reagent, roughly adjusting the wastewater to be treated in the first feeding unit 510, so that the pH value of the roughly adjusted wastewater to be treated is within the range of 7 to 8.

[0110] Step 5-2: The roughly adjusted wastewater to be treated obtained at the first feeding unit 510 is pumped to the circulation tank 512 by a pump (such as a feeding pump).

[0111] Step 5-3, the roughly adjusted wastewater to be treated is pumped from the circulation tank 512 to the second feeding unit 514, such as a hydrogen peroxide mixer in the second feeding unit 514, by a pump (such as a circulation pump). Further, at the second feeding unit 514, hydrogen peroxide with a concentration of 27.5% is added to the hydrogen peroxide mixer through a hydrogen peroxide dosing device, so that the hydrogen peroxide can be mixed with the roughly adjusted wastewater to be treated.

[0112] Step 5-4, the wastewater to be treated obtained at the second feeding unit 514 and mixed with hydrogen peroxide is passed into the third feeding unit 516, such as the acid-base mixer in the third feeding unit 516, for fine adjustment. Further, at the third feeding unit 516, liquid alkali with a concentration of 30% is added to the acid-base mixer through the liquid alkali dosing device, so that the liquid alkali can be mixed with the wastewater to be treated after being mixed with hydrogen peroxide, and the finely adjusted wastewater to be treated with a pH value in the range of 8 to 8.5 is obtained.

[0113] Step 5-5, the finely adjusted wastewater to be treated obtained at the third feeding unit 516 is introduced into the fourth feeding unit 518. Further, ozone with a concentration of 10% is generated by an ozone generator, and the generated ozone is mixed with the finely adjusted wastewater to be treated by an ozone injector to obtain a first intermediate mixture.

[0114] In this example, the ratio of the amount of hydrogen peroxide added in step 5-3 to the amount of ozone added in step 5-5 is between 0.1:1 and 1:1.

[0115] Step 5-6, the first intermediate mixture is sequentially introduced into the first mixer 522 and the second mixer 524, so that the wastewater to be treated, hydrogen peroxide and ozone in the first intermediate mixture can be forcibly mixed through the first mixer 522 and the second mixer 524 to increase the amount of hydroxyl radicals generated by hydrogen peroxide and ozone.

[0116] In this example, the first mixer 522 may be a gas-liquid mixing pump, and the second mixer 524 may be a rotary mixer.

[0117] Step 5-7, the mixed first intermediate mixture is introduced into the reactor 530 for oxidation. Specifically, the hydroxyl radicals in the mixed first intermediate mixture are fully contacted with the wastewater to be treated by using the pipes and baffles with varying diameters provided inside the reactor 530, so that the organic pollutants in the wastewater to be treated are fully oxidized, and the first reaction product is obtained at the outlet of the reactor 530.

[0118] Step 5-8, the first reaction product obtained at the outlet of the reactor 530 is returned to the discharge module 540 integrated in the circulation tank 512. Further, the first reaction product is separated into gas and liquid by the gas-liquid separator in the discharge module 540, wherein the gas obtained by gas-liquid separation is then passed through the ozone decomposer in the discharge module 540 to decompose the ozone in the gas into oxygen and discharge it. For the liquid obtained by gas-liquid separation, if the liquid meets the wastewater discharge requirements, the liquid is discharged; if the liquid does not meet the wastewater discharge requirements, this part of the liquid is mixed with the roughly adjusted wastewater to be treated in the circulation tank 512, and the above steps 5-3 to 5-8 are repeated until the liquid meets the wastewater discharge requirements.

[0119] According to the inventive concept of the present invention, a wastewater treatment system based on ozone and hydrogen peroxide is also provided, so as to control the wastewater treatment device provided by the present invention as above through a control unit to execute the wastewater treatment method provided by the present invention as above.

[0120] Figure 6 A schematic diagram of a wastewater treatment system 600 based on ozone and hydrogen peroxide according to an embodiment of the present invention is shown. It should be understood that the wastewater treatment system 600 may also include additional modules not shown and / or may omit the modules shown, and the scope of the present invention is not limited in this respect.

[0121] like Figure 6 As shown, the wastewater treatment system 600 includes a control unit 610 and a wastewater treatment device 620, wherein the control unit 610 is configured to control the wastewater treatment device 620 to perform the wastewater treatment method as described above.

[0122] Regarding the wastewater treatment device 620, it can be Figure 2 Wastewater treatment plant 200 or Figure 5 For details of the wastewater treatment device 500, please refer to the previous description.

[0123] Regarding the wastewater treatment method, it can be Figure 1 The wastewater treatment method 100 shown is described in detail above.

[0124] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

[0125] The above are only optional embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wastewater treatment method based on ozone and hydrogen peroxide, characterized in that: include: Pre-treating the received wastewater to be treated, and introducing hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture; Performing a first mixing and a second mixing on the first intermediate mixture, and passing the mixed first intermediate mixture into a reactor for sufficient reaction to obtain a first reaction product, wherein the first reaction product at least includes a first reaction liquid; and In response to the first reaction liquid satisfying wastewater discharge requirements, the first reaction liquid included in the first reaction product is discharged.

2. The wastewater treatment method according to claim 1, characterized in that: Pre-treating the received wastewater to be treated and introducing hydrogen peroxide and ozone into the wastewater to be treated comprises: Performing rough adjustment on the received wastewater to be treated so that the pH value of the wastewater to be treated meets a first predetermined condition; Passing hydrogen peroxide into the roughly adjusted wastewater to be treated; Finely adjusting the wastewater to be treated after the hydrogen peroxide solution is introduced so that the pH value of the wastewater to be treated meets the second predetermined condition; and Ozone is introduced into the finely conditioned wastewater to be treated to obtain the first intermediate mixture.

3. The wastewater treatment method according to claim 2, characterized in that: The first predetermined condition includes: the pH value of the wastewater to be treated is in the range of 7 to 8; and The second predetermined condition includes: the pH value of the wastewater to be treated is in the range of 8 to 8.

5.

4. The wastewater treatment method according to any one of claims 1 to 3, characterized in that: The concentration of the hydrogen peroxide ranges from 25% to 35%, and the concentration of the ozone ranges from 5% to 15%.

5. The wastewater treatment method according to claim 1, characterized in that: Performing the first mixing and the second mixing on the first intermediate mixture includes: performing the first mixing on the first intermediate mixture by using a gas-liquid mixing pump; and The second mixing is performed on the first intermediate mixture obtained by the first mixing by using a rotary mixer.

6. The wastewater treatment method according to claim 1, characterized in that: The reactor is provided with a plurality of pipes, each of which has a varying diameter, and the mixed first intermediate mixture is introduced into the reactor for full reaction, comprising: The mixed first intermediate mixture enters the plurality of pipes through the upper portion of the reactor and reaches the bottom of the reactor through the plurality of pipes, so that the mixed first intermediate mixture is fully reacted in the plurality of pipes.

7. The wastewater treatment method according to claim 1, characterized in that: Discharging the first reaction liquid included in the first reaction product includes: Performing gas-liquid separation on the first reaction product to obtain a first reaction gas and the first reaction liquid; determining whether the first reaction liquid meets wastewater discharge requirements; In response to the first reaction liquid satisfying the wastewater discharge requirement, discharging the first reaction liquid; and Catalytically heating the first reaction gas to discharge the catalytically heated first reaction gas.

8. A wastewater treatment device based on ozone and hydrogen peroxide, characterized in that: include: A feed module is configured to pre-treat the received wastewater to be treated, and to introduce hydrogen peroxide and ozone into the wastewater to be treated to obtain a first intermediate mixture; a mixing module, connected to the feeding module to receive the first intermediate mixture from the feeding module, wherein the feeding module is configured to perform a first mixing and a second mixing on the first intermediate mixture; a reaction module, connected to the mixing module, wherein the reaction module is configured to receive the mixed first intermediate mixture from the mixing module and perform a sufficient reaction to obtain a first reaction product, wherein the first reaction product at least includes a first reaction liquid; and A discharge module is connected to the reaction module, and is used to discharge the first reaction liquid included in the first reaction product at least when the first reaction liquid meets the wastewater discharge requirement.

9. The wastewater treatment device according to claim 8, characterized in that: The feeding module comprises: A first feeding unit is configured to: receive the wastewater to be treated and a first reagent for adjusting the pH value of the wastewater to be treated, and perform a rough adjustment on the received wastewater to be treated based on the first reagent; A second feeding unit is disposed downstream of the first feeding unit and is configured to introduce hydrogen peroxide into the roughly adjusted wastewater to be treated; a third feeding unit, disposed downstream of the second feeding unit, and configured to: receive a second reagent for adjusting the pH of the wastewater to be treated, and perform fine adjustment on the received wastewater to be treated based on the second reagent; and The fourth feeding unit is disposed downstream of the third feeding unit and is configured to introduce ozone into the finely conditioned wastewater to be treated.

10. The wastewater treatment device according to claim 8, characterized in that: The mixing module comprises a first mixer and a second mixer connected in sequence, wherein: The first mixer is a gas-liquid mixing pump, configured to perform the first mixing on the first intermediate mixture; The second mixer is a rotary mixer configured to perform the second mixing on the first intermediate mixture subjected to the first mixing.

11. The wastewater treatment device according to claim 8, characterized in that: The reaction module comprises a reactor, wherein a plurality of pipes are arranged inside the reactor, and the diameter of each pipe is varied.

12. The wastewater treatment device according to claim 8 or 11, characterized in that: The reactor is provided with baffles inside.

13. The wastewater treatment device according to claim 8, characterized in that: The discharge module comprises: a gas-liquid separator configured to perform gas-liquid separation on the first reaction product to obtain a first reaction gas and the first reaction liquid; and The ozone decomposer is configured to perform catalytic heating on the first reaction gas to decompose ozone in the first reaction gas into oxygen.

14. The wastewater treatment device according to claim 9, characterized in that: The feeding module also includes: A circulation tank, wherein a first inlet of the circulation tank is connected to an outlet of the first feeding unit, a second inlet of the circulation tank is connected to an outlet of the reaction module, and a first outlet of the circulation tank is connected to an inlet of the second feeding unit.

15. A wastewater treatment system based on ozone and hydrogen peroxide, characterized in that: include: The wastewater treatment device according to any one of claims 9 to 14; as well as A control unit, used to control the wastewater treatment device to perform the steps of the wastewater treatment method according to any one of claims 1 to 7.

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