Sewage treatment system for efficiently removing COD (Chemical Oxygen Demand) by catalyzing ozone with activated carbon

Abstract

The utility model discloses a sewage treatment system for efficiently removing COD (Chemical Oxygen Demand) by catalyzing ozone with activated carbon, which comprises a reactor and a Venturi jet mixer, the Venturi jet mixer is used for uniformly mixing sewage, activated carbon suspension and ozone which are conveyed into the Venturi jet mixer, and a uniformly mixed gas-liquid mixed solution is conveyed into the reactor through a pipeline; and the reactor sends the reacted solution to a sedimentation tank for treatment. Ozone oxygenolysis and activated carbon adsorption are combined, and the activated carbon not only can play a role of an adsorbent, but also can play a role of catalyzing ozone, so that the decomposition rate of O3 is increased, the generation of strong oxidizing substances is promoted, and the removal rate of COD (Chemical Oxygen Demand) is increased; according to the present invention, the activated carbon is used to decompose O3, the COD is accumulated together by using the activated carbon, the decomposed O3 can well perform targeted removal on the COD, the O3 utilization rate is improved, the cost is reduced, most of the subsequently precipitated activated carbon sludge is subjected to reflux, and a small part of the subsequently precipitated activated carbon sludge is discharged, such that the carbon powder addition amount and the sludge generation amount can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment system for efficiently removing COD by catalyzing ozone with activated carbon. Background Art

[0002] After the industrial wastewater is treated with biochemical sludge, it needs to be treated with coagulation and adsorption to further reduce COD and total nitrogen to ensure that the effluent meets the standards. The current mainstream process is to use only activated carbon adsorption or Fenton process, but the sewage treatment system corresponding to the above process has high treatment costs, low COD removal efficiency, and large sludge production. Therefore, it is necessary to develop a sewage treatment system with high COD removal efficiency and low sludge production. Utility Model Content

[0003] Therefore, based on the above background, the utility model improves the existing technology and provides a sewage treatment system for efficiently removing COD by activated carbon catalyzed ozone, which has high COD removal efficiency, large processing capacity, low cost and small sludge production.

[0004] And the technical solution provided by the utility model is:

[0005] A sewage treatment system for efficient COD removal by ozone catalysis combined with activated carbon, comprising a reactor, a venturi jet mixer,

[0006] The Venturi jet mixer is connected to an activated carbon suspension storage tank, an ozone generator, and a sewage delivery pipeline through pipelines, and the Venturi jet mixer mixes the sewage, activated carbon suspension, and ozone delivered therein evenly;

[0007] The venturi jet mixer is connected to the reactor through a pipeline, and the venturi jet mixer transports the uniformly mixed mixed liquid to the reactor through the pipeline;

[0008] The reactor is connected to the sedimentation tank through a pipeline, and the reactor sends the reacted solution to the sedimentation tank for treatment.

[0009] Furthermore, a first reflux pipe and a second reflux pipe are respectively provided between the sedimentation tank and the reactor. The sedimentation tank refluxes the supernatant to the reactor through the first reflux pipe, and the sedimentation tank refluxes the sludge to the reactor through the second reflux pipe.

[0010] Furthermore, a first jet mixer is provided on the first reflux pipe, the first jet mixer is connected to an ozone generator through a pipe, and the ozone generator transports ozone to the first jet mixer through the pipe.

[0011] Furthermore, a second jet mixer is provided on the second reflux pipe, and the second jet mixer is connected to the ozone generator through a pipe, and the ozone generator transports ozone to the second jet mixer through the pipe.

[0012] Furthermore, a sludge pump is provided between the second jet mixer and the sedimentation tank.

[0013] Furthermore, a sewage lifting pump is provided on the sewage conveying pipeline.

[0014] Furthermore, a paddle stirrer is provided in the reactor.

[0015] Furthermore, the reactor is connected to an ozone tail gas destroyer via a tail gas pipeline.

[0016] The above technical solution has the following beneficial effects:

[0017] ① The utility model combines ozone oxidation decomposition with activated carbon adsorption, wherein the activated carbon not only acts as an adsorbent, but also acts as a catalyst for ozone to increase the decomposition rate of O3, thereby promoting the generation of strong oxidizing substances and improving the COD removal rate;

[0018] ② The activated carbon of the utility model can accumulate COD together. Compared with the single ozone oxidation decomposition treatment, the decomposed O3 can better remove COD in a targeted manner, improve the utilization rate of O3, reduce O3 waste, save costs, and improve treatment efficiency;

[0019] ③ After the COD adsorbed by activated carbon is decomposed by ozone oxidation, its adsorption effect will be partially restored, further reducing costs;

[0020] ④ According to the utility model, part of the activated carbon sludge subsequently precipitated is refluxed, and a small part is discharged, which can effectively reduce the amount of carbon powder added and the amount of sludge generated, and further reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0026] The utility model is further described below in conjunction with the accompanying drawings.

[0027] Example 1: Reference Figure 1 The sewage treatment system shown is a sewage treatment system for efficiently removing COD by combining ozone catalysis with activated carbon, which includes a reactor 1 and a venturi jet mixer 2. The venturi jet mixer 2 is connected to an activated carbon suspension storage tank 3, an ozone generator 4, and a sewage conveying pipeline through pipelines, and the venturi jet mixer 2 mixes the sewage, activated carbon suspension, and ozone conveyed therein evenly; the venturi jet mixer 2 is connected to the reactor 1 through a pipeline, and the venturi jet mixer 2 conveys the evenly mixed mixed liquid to the reactor 1 through the pipeline; the reactor 1 is provided with a paddle stirrer 13, and the contact efficiency of ozone and COD is increased by stirring.

[0028] The reactor 1 is connected to the sedimentation tank 6 through a pipeline, and the reactor 1 sends the reacted solution to the sedimentation tank 6 for treatment. A first reflux pipeline 10 and a second reflux pipeline 11 are respectively arranged between the sedimentation tank 6 and the reactor 1. The sedimentation tank 6 refluxes the supernatant to the reactor 1 through the first reflux pipeline 10, and the sedimentation tank refluxes the sludge to the reactor 1 through the second reflux pipeline 11.

[0029] The first reflux pipe 10 is provided with a first jet mixer 7, which is connected to the ozone generator 4 through a pipe, and the ozone generator 4 transports ozone to the first jet mixer 7 through a pipe. In specific implementation, part of the supernatant in the sedimentation tank 6 is discharged through the external discharge line 15. The second reflux pipe 11 is provided with a second jet mixer 8, which is connected to the ozone generator 4 through a pipe, and the ozone generator 4 transports ozone to the second jet mixer 8 through a pipe. It has been verified in practice that the concentration of ozone in the gas-liquid mixture obtained after mixing by the first jet mixer 7 and the second jet mixer 8 is controlled to be above 1.2 mg / L. The ozone catalytic effect is best at this concentration, and the upper limit does not exceed 1.6 mg / L. If the ozone concentration is too high, its economic benefits will deteriorate and the processing cost will increase.

[0030] A sludge pump 12 is provided between the second jet mixer 8 and the sedimentation tank 6. A sewage lifting pump 5 is provided on the sewage delivery pipeline. In specific implementation, the sludge in the sedimentation tank 6 is partially transported to the sludge tank 9 through the sludge pump 12. Whether the sedimentation tank 6 needs to discharge sludge is determined based on the 30-minute sedimentation ratio of the returned sludge, and the sedimentation ratio is controlled at about 50%.

[0031] The reactor 1 is connected to an ozone exhaust gas destroyer 14 through an exhaust gas pipeline. The principle of the ozone exhaust gas destroyer 14 is to utilize the catalyst and reducing substances in the destroyer to oxidize and decompose the ozone in the exhaust gas into clean products such as oxygen, water, and carbon dioxide. This is the prior art and is not the improvement content of the present utility model, so it will not be elaborated.

[0032] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A sewage treatment system for efficient COD removal by activated carbon catalysis and ozone, characterized in that: It includes a reactor, a venturi jet mixer, The Venturi jet mixer is connected to an activated carbon suspension storage tank, an ozone generator, and a sewage delivery pipeline through pipelines, and the Venturi jet mixer mixes the sewage, activated carbon suspension, and ozone delivered therein evenly; The venturi jet mixer is connected to the reactor through a pipeline, and the venturi jet mixer transports the uniformly mixed mixed liquid to the reactor through the pipeline; The reactor is connected to the sedimentation tank through a pipeline, and the reactor sends the reacted solution to the sedimentation tank for treatment.

2. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 1 is characterized in that: A first reflux pipe and a second reflux pipe are respectively arranged between the sedimentation tank and the reactor. The sedimentation tank refluxes the supernatant to the reactor through the first reflux pipe, and the sedimentation tank refluxes the sludge to the reactor through the second reflux pipe.

3. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 2 is characterized in that: The first reflux pipeline is provided with a first jet mixer, the first jet mixer is connected to the ozone generator through a pipeline, and the ozone generator transports ozone to the first jet mixer through the pipeline.

4. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 3 is characterized in that: The second return pipe is provided with a second jet mixer, the second jet mixer is connected to the ozone generator through a pipe, and the ozone generator transports ozone to the second jet mixer through the pipe.

5. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 4 is characterized in that: A sludge pump is provided between the second jet mixer and the sedimentation tank.

6. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 1 is characterized in that: A sewage lifting pump is arranged on the sewage conveying pipeline.

7. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 1 is characterized in that: A paddle stirrer is arranged in the reactor.

8. The sewage treatment system for efficient COD removal by activated carbon catalysis and ozone according to claim 1 is characterized in that: The reactor is connected with an ozone tail gas destroyer through a tail gas pipeline.

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