Sewage treatment system for synergistically degrading environmental hormones by using multi-stage biological filter

Abstract

The invention belongs to the technical field of sewage treatment application, and particularly relates to a sewage treatment system for synergistically degrading environmental hormones by a multi-stage biological filter. The device comprises a first-stage degradation tank, a second-stage degradation tank, a third-stage degradation tank and a fourth-stage degradation tank which are sequentially communicated with one another along the flow direction of sewage, and has the advantages that by arranging porous titanium dioxide hollow spheres, the primary photolysis of environmental hormones is realized; the secondary degradation pool and the third-stage degradation pool are filled with porous ceramic balls, and the porous ceramic balls are poor in adsorption capacity and porous in structure, so that the porous ceramic balls serve as a hotbed of microorganisms, and the environmental hormone can be effectively degraded by the microorganisms, so that the environmental hormone can be effectively degraded by the microorganisms, and the environmental hormone can be effectively degraded by the microorganisms in the second-stage degradation pool and the third-stage degradation pool in the second-stage degradation pool and the third-stage degradation pool. And finally, adsorbing the environmental hormones treated for three times by utilizing a physical adsorption material in the fourth-stage degradation tank.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment applications, and in particular relates to a sewage treatment system for collaboratively degrading environmental hormones using multi-stage biological filters. Background Art

[0002] In recent years, humans have produced and used a large number of chemical compounds to meet the needs of industrial and agricultural production. These compounds are also released into the environment through human production and daily life. They are often toxic and harmful, and difficult to degrade and purify, leading to a gradual deterioration of environmental conditions and numerous environmental pollution problems. Among them, two common pollutants, antibiotics and environmental hormones, pose serious risks to the natural environment and human health.

[0003] Environmental hormones, also known as environmental endocrine disruptors, are exogenous chemicals that interfere with the endocrine system. The harmful effects of these substances on organisms are not due to their direct toxicity, but rather to their ingestion and accumulation. They affect the endocrine system in estrogen-like ways, thereby affecting normal function. Even low levels can cause endocrine disorders.

[0004] At present, the main treatment methods for environmental hormones are physical adsorption, chemical oxidation and microbial degradation. The above three methods can achieve the purpose of effectively removing environmental hormones in sewage, but each method has certain problems. For example, in the physical adsorption method, since the adsorption material is filled with adsorbent within a certain period of time, it needs to be replaced frequently and in time; chemical oxidation such as Fenton reagent-advanced oxidation method and electrochemical oxidation method have the problem of high cost of use; microbial degradation has the problem of long cultivation cycle. Therefore, how to effectively utilize the advantages of the above methods, effectively combine them, and reduce and avoid their shortcomings is the current key research direction. Summary of the Invention

[0005] In response to the technical problems existing in the existing degradation of environmental hormones, the present invention proposes a sewage treatment system with a multi-stage biological filter that synergistically degrades environmental hormones, which has a reasonable design, simple structure, and convenient processing, and can effectively degrade sewage containing environmental hormones and has few shortcomings.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a sewage treatment system for synergistically degrading environmental hormones using a multi-stage biological filter, comprising a primary degradation tank, a secondary degradation tank, a tertiary degradation tank and a quaternary degradation tank which are connected along the flow direction of sewage. The primary degradation tank, the secondary degradation tank, the tertiary degradation tank and the quaternary degradation tank all comprise a tank body and an auxiliary degradation tank arranged above the tank body. The auxiliary degradation tank is provided with a water inlet pipe, the tank body is provided with an overflow pipe, the upper degradation tank is connected to the lower degradation tank through the overflow pipe, an overflow trough is provided on one side of the auxiliary degradation tank, the overflow trough is connected to the auxiliary degradation tank, the top surface of the overflow trough is flush with the auxiliary degradation tank, and the overflow trough is flush with the auxiliary degradation tank. The depth is set to be less than that of the auxiliary degradation tank, wherein the auxiliary degradation tank of the primary degradation tank is provided with porous titanium dioxide hollow balls, and the porous titanium dioxide hollow balls are evenly distributed in an array in the auxiliary degradation tank of the primary degradation tank. The auxiliary degradation tank of the primary degradation tank is also provided with an ozone aeration pipe, the auxiliary degradation tanks of the secondary degradation tank and the tertiary degradation tank are filled with porous ceramic balls, and the auxiliary degradation tank of the quaternary degradation tank is filled with physical adsorption materials. Microbial colonies for degrading environmental hormones are cultured in the tank bodies of the primary degradation tank, the secondary degradation tank, the tertiary degradation tank and the quaternary degradation tank, and microbial colonies for degrading environmental hormones are also cultured in the auxiliary degradation tanks of the secondary degradation tank and the tertiary degradation tank.

[0007] Preferably, the porous titanium dioxide hollow spheres are rotatably arranged in the auxiliary degradation tank.

[0008] Preferably, a lifting device is further provided in the auxiliary degradation tank of the four-stage degradation tank, and the lifting device includes a screw elevator arranged on both sides of the auxiliary degradation tank, a connecting plate is provided on the top of the output end of the screw elevator, a fixing plate is provided on the side of the connecting plate close to the auxiliary degradation tank, a connecting rod is provided on the side of the fixing plate away from the connecting plate, the connecting rod is vertically arranged, a connecting piece is provided on the connecting rod, a drag rod is provided on the connecting piece, a physical adsorption material placement groove is provided between the drag rods on both sides of the auxiliary degradation tank, and the connecting pieces are arranged on the connecting rod at intervals.

[0009] Preferably, the physical adsorption material placement slot includes a slot body and connecting ears arranged on both sides of the slot body, the bottom of the connecting ears is provided with slot holes, and the physical adsorption material placement slot is placed on the drag rod through the slot holes.

[0010] Preferably, the screw lifts are arranged at intervals on both sides of the auxiliary degradation tank.

[0011] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention provides a sewage treatment system for collaboratively degrading environmental hormones using a multi-stage biological filter. A porous titanium dioxide hollow ball arrangement is used to achieve preliminary photolysis of the environmental hormones. An ozone aeration pipe arrangement is used to convert the environmental hormones into corresponding intermediate products that are easily degraded by microorganisms and have low toxicity, thereby paving the way for subsequent microbial degradation. Porous ceramic balls are filled in the secondary degradation tank and the auxiliary degradation tank of the tertiary degradation tank, and their poor adsorption capacity but porous structure serve as a breeding ground for microorganisms to cultivate degrading bacteria. Finally, physical adsorption materials in the quaternary degradation tank are used to adsorb the environmental hormones after three treatments. At this time, since the content of the environmental hormones is relatively low, there is no need for frequent replacement, and the physical adsorption materials provide the final guarantee for the degradation of the microorganisms, allowing them sufficient time for cultivation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0013] Figure 1 A schematic diagram of the structure of a sewage treatment system for collaboratively degrading environmental hormones using multi-stage biofilters provided in Example 1; Figure 2 A schematic structural diagram of the lifting device provided in Example 1; Figure 3 A schematic structural diagram of a physical adsorption material placement tank provided in Example 1; In the above figures, 1. primary degradation tank; 2. secondary degradation tank; 3. tertiary degradation tank; 4. quaternary degradation tank; 5. auxiliary degradation tank; 51. water inlet pipe; 52. porous titanium dioxide hollow ball; 53. ozone aeration pipe; 54. porous ceramic ball; 6. overflow pipe; 7. lifting device; 71. screw lifter; 72. connecting plate; 73. fixing plate; 74. connecting rod; 75. connecting piece; 76. tow rod; 8. physical adsorption material placement tank; 81. tank body; 82. connecting ear; 83. slot hole; 9. overflow tank. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0015] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0016] Example 1, as Figures 1 to 3 As shown, this embodiment aims to integrate the existing methods for treating environmental hormones to reduce the disadvantages of various existing methods. To this end, in order to achieve the above purpose, this embodiment provides a sewage treatment system for synergistically degrading environmental hormones using a multi-stage biological filter, comprising a primary degradation tank 1, a secondary degradation tank 2, a tertiary degradation tank 3 and a quaternary degradation tank 4 connected along the flow direction of sewage, and the primary degradation tank 1, the secondary degradation tank 2, the tertiary degradation tank 3 and the quaternary degradation tank 4 all include a tank body and an auxiliary degradation tank 5 arranged above the tank body, and a water inlet pipe 51 is provided on the auxiliary degradation tank 5. At the same time, an overflow trough 9 is provided on one side of the auxiliary degradation tank 5, and the overflow trough 9 is connected to the auxiliary degradation tank 5. An overflow hole is provided at the bottom of the overflow trough 9, so that the sewage first enters the auxiliary degradation tank 5, and after the auxiliary degradation tank 5 is full, it enters the overflow trough 9. The overflow trough 9 does not have the ability to store water, and it directly discharges the water entering the overflow trough 9 into the tank body.

[0017] Considering that the overflow trough 9 does not have the ability to store water and the purpose of setting up the auxiliary degradation pool 5 is to assist degradation, in this embodiment, the top surface of the overflow trough 9 is set flush with the auxiliary degradation pool 5, and the depth of the overflow trough 9 is set less than the depth of the auxiliary degradation pool 5. In this way, the auxiliary degradation pool 5 has a certain depth to meet its water storage needs.

[0018] An overflow pipe 6 is provided on the pool body, and the upper-level degradation pool 1 is connected to the lower-level degradation pool 1 through the overflow pipe 6. At the same time, the overflow pipe 6 on the fourth-level degradation pool 4 is used as a water pipe. In this embodiment, the main purpose of using overflow to discharge water is to reduce the flow rate of sewage and, at the same time, preserve microbial strains.

[0019] In order to achieve the purpose of degrading environmental hormones, in this embodiment, porous titanium dioxide hollow balls 52 are arranged in the auxiliary degradation pool 5 of the primary degradation pool 1. The porous titanium dioxide hollow balls 52 are evenly distributed in an array in the auxiliary degradation pool 5 of the primary degradation pool 1, and the porous titanium dioxide hollow balls 52 are rotatably arranged in the auxiliary degradation pool 5. The porous titanium dioxide hollow balls 52 are titanium dioxide coatings sprayed on the surface of the porous hollow balls. Anatase nano-scale titanium dioxide has the characteristics of high specific surface area, high surface lattice defects and high surface energy, and thus has high photocatalytic activity. Its photocatalytic activity can reduce the activity of environmental hormones and facilitate subsequent microbial decomposition.

[0020] Similarly, to further reduce the activity of environmental hormones, ozone aeration pipes 53 are installed in the auxiliary degradation tank 5 of the primary degradation tank 1. These pipes are evenly distributed in a grid pattern at the bottom of the auxiliary degradation tank 5. This arrangement is because bubbles move upward, and a single pipe would be difficult to fully aerate. Ozone can convert environmental hormones into corresponding intermediate products that are easily biodegradable and less toxic. Furthermore, ozone is relatively inexpensive.

[0021] The auxiliary degradation pool 5 of the secondary degradation pool 2 and the tertiary degradation pool 3 is filled with porous ceramic balls 54. The porous ceramic balls 54 are mainly provided to cultivate microbial colonies. The porous ceramic balls 54 have a pore structure, which is convenient for cultivating the microorganisms required for degradation. At the same time, the adsorption ability of the porous ceramic balls 54 is poor, and it is difficult or slow for them to be filled with the adsorption medium. During this time, the microorganisms can decompose them. In this way, there is no need to replace the porous ceramic balls 54, and a stable living environment can be provided for the microorganisms.

[0022] The auxiliary degradation pool 5 of the quaternary degradation pool 4 is filled with physical adsorption materials. Since the environmental hormones entering the auxiliary degradation pool 5 of the quaternary degradation pool 4 are lower after the previous degradation treatment, the replacement cycle of the physical adsorption materials is slowed down. At the same time, the physical adsorption materials are set in the auxiliary degradation pool 5 of the quaternary degradation pool 4. In the early use process, it has the function of checking for deficiencies and filling in the gaps. It can provide the time required for microbial reproduction, that is, the physical adsorption materials need to be replaced more frequently in the early stage. Later, when the microbial strains are expected to have a large reproduction area, they do not need to be replaced frequently. In addition, the activity of environmental hormones in the auxiliary degradation pool 5 of the primary degradation pool 1 is reduced, which is also beneficial to microbial degradation and cultivation, and reduces the pressure on the physical adsorption materials. In this embodiment, the physical adsorption materials are adsorptive materials such as activated carbon and vermiculite.

[0023] Of course, microbial colonies for degrading environmental hormones are cultivated in the primary degradation tank 1, secondary degradation tank 2, tertiary degradation tank 3, and quaternary degradation tank 4. Microbial colonies for degrading environmental hormones are also cultivated in the secondary degradation tank 2 and the auxiliary degradation tank 5 of the tertiary degradation tank 3. Microbial colonies are not cultivated in the primary degradation tank 1 primarily to prevent the strong oxidizing properties of ozone from killing the bacteria. The bacterial species can be determined based on the type of environmental hormone in the wastewater. For example, if the environmental hormone is bisphenol A, the bacterial species may be from the genera Sphingomonas, Sphingobium, Sphingopyxis, and Novosphingobium.

[0024] Taking into account that in actual use, the physical adsorption material in the upper layer will be filled first, while the physical adsorption material in the lower layer may overflow without coming into contact with the environmental hormones, in order to effectively utilize the physical adsorption material in the lower layer, in this embodiment, a lifting device 7 is also provided in the auxiliary degradation tank 5 of the four-stage degradation tank 4. The lifting device 7 includes a screw lift 71 arranged on both sides of the auxiliary degradation tank 5. The screw lifts 71 on both sides can be synchronously controlled by a motor and a commutator structure, or both sides can be controlled by a separate motor.

[0025] A connecting plate 72 is provided at the top of the output end (screw) of the screw elevator 71. A fixing plate 73 is provided on the side of the connecting plate 72 near the auxiliary degradation tank 5. A T-shaped structure is formed between the connecting plate 72 and the fixing plate 73. A connecting rod 74 is provided on the side of the fixing plate 73 away from the connecting plate 72. The connecting rod 74 is vertically arranged and equipped with a connecting piece 75. A drag rod 76 is provided on the connecting piece 75. Physical adsorption material placement grooves 8 are provided between the drag rods 76 on both sides of the auxiliary degradation tank 5. The connecting pieces 75 are arranged at intervals on the connecting rod 74. In this way, multiple layers of physical adsorption material placement grooves 8 can be placed on a single connecting rod 74. In this embodiment, three layers are provided. It should be noted that the height of the connecting pieces 75 should ensure that when the screw elevator 71 descends to the bottom, all physical adsorption material placement grooves 8 are immersed in the auxiliary degradation tank 5. When the screw elevator 71 ascends to the top, all physical adsorption material placement grooves 8 are removed from the auxiliary degradation tank 5.

[0026] In this way, after a period of use, the screw lift 71 rises, and the first layer of physical adsorption material placement groove 8 is exposed above the auxiliary degradation tank 5. In this way, the second layer begins to complete the adsorption work. The advantage of this setting is that it can not only effectively utilize multiple layers of physical adsorption materials, but also facilitate the subsequent reuse of physical adsorption materials. Since each layer of physical adsorption material can be adsorbed for a certain period of time, the physical adsorption material exposed above the auxiliary degradation tank 5 will dry naturally. Then, by using the purging method, it needs to be dried to regenerate the physical adsorption material, which is convenient for recycling.

[0027] To facilitate removal of the physical adsorption material placement tank 8, in this embodiment, the physical adsorption material placement tank 8 includes a tank body 81 and connecting ears 82 provided on both sides of the tank body 81. The bottoms of the connecting ears 82 are provided with slots 83. The physical adsorption material placement tank 8 is placed on the drag rod 76 through the slots 83. In this way, when the physical adsorption material is naturally dried, the staff can simply pull the physical adsorption material placement tank 8 off the drag rod 76.

[0028] In order to fully utilize the auxiliary degradation tank 5, in this embodiment, screw lifts 71 are spaced apart on both sides of the auxiliary degradation tank 5. A layer of several screw lifts 71 share a drag rod 76, so that more physical adsorption material placement slots 8 can be placed, further reducing the replacement frequency.

[0029] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A sewage treatment system for synergistically degrading environmental hormones using a multi-stage biological filter, characterized in that: The utility model comprises a primary degradation pool, a secondary degradation pool, a tertiary degradation pool and a quaternary degradation pool which are connected in this way along the flow direction of sewage. The primary degradation pool, the secondary degradation pool, the tertiary degradation pool and the quaternary degradation pool all comprise a pool body and an auxiliary degradation pool arranged above the pool body. The auxiliary degradation pool is provided with a water inlet pipe, the pool body is provided with an overflow pipe, the upper degradation pool is connected with the lower degradation pool through the overflow pipe, an overflow trough is provided on one side of the auxiliary degradation pool, the overflow trough is connected with the auxiliary degradation pool, the top surface of the overflow trough is flush with the auxiliary degradation pool, the depth of the overflow trough is less than the depth of the auxiliary degradation pool, wherein the primary degradation pool The auxiliary degradation tank is provided with porous titanium dioxide hollow balls, which are evenly distributed in an array in the auxiliary degradation tank of the primary degradation tank. The auxiliary degradation tank of the primary degradation tank is also provided with an ozone aeration pipe. The auxiliary degradation tanks of the secondary degradation tank and the tertiary degradation tank are filled with porous ceramic balls. The auxiliary degradation tank of the quaternary degradation tank is filled with physical adsorption materials. Microbial colonies for degrading environmental hormones are cultured in the tank bodies of the primary degradation tank, the secondary degradation tank, the tertiary degradation tank and the quaternary degradation tank. Microbial colonies for degrading environmental hormones are also cultured in the auxiliary degradation tanks of the secondary degradation tank and the tertiary degradation tank.

2. A sewage treatment system for synergistically degrading environmental hormones using a multi-stage biofilter according to claim 1, characterized in that: The porous titanium dioxide hollow balls are rotatably arranged in the auxiliary degradation tank.

3. A sewage treatment system for synergistically degrading environmental hormones using a multi-stage biofilter according to claim 2, characterized in that: A lifting device is also provided in the auxiliary degradation tank of the four-stage degradation tank, and the lifting device includes screw elevators arranged on both sides of the auxiliary degradation tank, a connecting plate is provided on the top of the output end of the screw elevator, a fixing plate is provided on the side of the connecting plate close to the auxiliary degradation tank, a connecting rod is provided on the side of the fixing plate away from the connecting plate, the connecting rod is vertically arranged, a connecting piece is provided on the connecting rod, a drag rod is provided on the connecting piece, a physical adsorption material placement groove is provided between the drag rods on both sides of the auxiliary degradation tank, and the connecting pieces are arranged on the connecting rod at intervals.

4. A sewage treatment system for synergistically degrading environmental hormones using a multi-stage biofilter according to claim 3, characterized in that: The physical adsorption material placement slot includes a slot body and connecting ears arranged on both sides of the slot body, the bottom of the connecting ears is provided with slot holes, and the physical adsorption material placement slot is placed on the tow bar through the slot holes.

5. The sewage treatment system for synergistically degrading environmental hormones using a multi-stage biofilter according to claim 3, characterized in that: The screw lifts are arranged at intervals on both sides of the auxiliary degradation tank.

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