An ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor

Abstract

The utility model provides an ecological device for treating tail water of a sewage treatment plant in combination with a membrane aeration bioreactor, and relates to the technical field of municipal sewage treatment, including: a pretreatment area, in which a membrane aeration bioreactor membrane assembly is arranged; a landscape oxygenation area, in which a multi-level waterfall step is arranged; an ecological treatment area, in which a wetland is arranged; sewage passes through the pretreatment area, the landscape oxygenation area and the ecological treatment area in sequence. The utility model reduces the load of the artificial wetland and its land area by pretreating the tail water of the sewage treatment plant entering the artificial wetland through a membrane aeration bioreactor; the multi-level waterfall step not only serves as a landscape area, but also the water flow can freely flow through the multi-level waterfall step, and at the same time, energy can be dissipated on it in the form of a water drop, ensuring the stability of the water flow, and increasing dissolved oxygen for the water flow, so that the oxygen content of the water flow entering the ecological treatment area is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of municipal sewage treatment, in particular to an ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor. Background Art

[0002] The treatment of tailwater from sewage treatment plants is an important part of realizing the recycling of water resources and promoting the sustainable development of ecosystems. The current ecological measures used for tailwater treatment in sewage treatment plants are mainly artificial wetland technology, which is an effective water ecological restoration technology. It removes pollutants from sewage by simulating natural wetlands to improve water quality. It has the advantages of good pollutant removal effect and simple system structure, but it also has disadvantages such as large land area and stability affected by seasons. In order to save increasingly precious land resources and meet the technical requirements for stable and standard tailwater treatment in sewage treatment plants, a stable and efficient new artificial wetland ecological technology is urgently needed.

[0003] Membrane aerated bioreactor (MABR) is a new type of sewage treatment process that combines gas separation membrane bubbleless aeration technology with biofilm water treatment technology. It has technical advantages such as bubbleless aeration, simultaneous nitrification and denitrification, and low-carbon denitrification.

[0004] In the prior art, the PCT international application China published patent CN 112424129A published on February 26, 2021, discloses the use of membrane aerated biofilm side stream pretreatment to remove ammonia from high-strength wastewater, by allowing the MABR to receive the high-strength wastewater and discharge the effluent to the activated sludge system.

[0005] However, this type of prior art does not take into account how to increase dissolved oxygen in the water between the membrane aerated bioreactor (MABR) and the ecological treatment area. Utility Model Content

[0006] The purpose of the utility model is to provide an ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor, which can increase dissolved oxygen in the water body through multiple waterfall steps;

[0007] The utility model provides an ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor, comprising:

[0008] A pretreatment area, wherein a membrane aeration bioreactor membrane assembly is provided in the pretreatment area;

[0009] A landscape oxygenation area, wherein the landscape oxygenation area is provided with multiple steps of waterfalls;

[0010] An ecological treatment area, wherein a wetland is provided in the ecological treatment area;

[0011] The sewage passes through the pretreatment area, the landscape oxygenation area and the ecological treatment area in sequence.

[0012] Furthermore, the pretreatment zone is provided with a water inlet, and sewage flows into the pretreatment zone from the water inlet.

[0013] Furthermore, the pretreatment area is provided with an overflow port, and the sewage flows out of the pretreatment area from the overflow port.

[0014] Furthermore, a water distribution trough is provided in the landscape oxygenation area, the waterfall step is located at the outlet side of the water distribution trough, and sewage flows into the water distribution trough from the overflow port.

[0015] Furthermore, the multiple levels of the waterfall steps are arranged from high to low, and the sewage flows from the top waterfall step to the bottom waterfall step, and then flows to the ecological treatment area.

[0016] Furthermore, the ecological treatment area is provided with a water outlet, and the treated water flows out of the ecological treatment area from the water outlet.

[0017] Furthermore, an anti-seepage geotextile is provided at the bottom of the landscape oxygenation area and the ecological treatment area.

[0018] Furthermore, the wetland includes a sandy loam layer and a fine sand layer, and the sandy loam layer is located on the upper layer of the fine sand layer.

[0019] Furthermore, the wetland also includes a permeable geotextile, and the permeable geotextile is located between the sandy loam layer and the fine sand layer.

[0020] Furthermore, a water outlet well is provided on one side of the ecological treatment area, and the water outlet is connected to the water outlet well.

[0021] The technical solution of the utility model is to place the membrane aerated bioreactor in front of the artificial wetland to pre-treat the tailwater of the sewage treatment plant entering the artificial wetland, reduce the load of the artificial wetland, and reduce its floor area; at the same time, by combining the technical advantages of the membrane aerated bioreactor, the sensitivity of the artificial wetland to seasons, temperature, etc. is weakened, and the treatment stability is improved; the entire system mainly flows by gravity, and at the same time, the membrane aerated bioreactor requires very little external carbon source during operation, and has the advantages of low energy consumption, low drug consumption, and low sludge production, which is convenient for operation and maintenance. A landscape oxygenation zone is set between the pretreatment area and the ecological treatment area. The multi-level waterfall steps not only serve as a landscape area, but also the water flow can flow freely on the multi-level waterfall steps. At the same time, the water flow can be dissipated on it in the form of a water drop, ensuring the stability of the water flow, and adding dissolved oxygen to the water flow, so that the oxygen content of the water entering the ecological treatment area is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a top view schematic diagram of the utility model;

[0024] Figure 2 It is a side view schematic diagram of the utility model;

[0025] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0026] Description of reference numerals:

[0027] 1-water inlet, 2-membrane aeration bioreactor membrane assembly, 3-overflow, 4-water distribution trough, 5-water drop step, 6-water distribution trough baffle, 7-sandy loam layer, 8-fine sand layer, 9-impermeable geotextile, 10-permeable geotextile, 11-water outlet, 12-water outlet well, 13-pretreatment area, 14-landscape oxygenation area, 15-ecological treatment area. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Example 1

[0032] like Figure 1-Figure 3 As shown, the utility model provides an ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor, comprising: a pretreatment area 13, in which a membrane aeration bioreactor membrane assembly 2 is arranged; a landscape oxygenation area 14, in which a multi-level waterfall step 5 is arranged; an ecological treatment area 15, in which a wetland is arranged; sewage passes through the pretreatment area 13, the landscape oxygenation area 14 and the ecological treatment area 15 in sequence.

[0033] Specifically, the pretreatment zone 13 is located at Figure 1 In the lower left corner, Landscape Oxygenation Area 14 is located Figure 1 In the upper left corner, ecological treatment area 15 (mainly a subsurface artificial wetland) is located Figure 1 Center right.

[0034] Membrane aerated bioreactor (MABR) is a prior art, which consists of a hollow fiber membrane filler part and a water flow part. Since the diameter of the micropores of the fiber membrane is very small, 0.1 to 0.5 μm, aeration produces bubbles that are invisible to the naked eye, so it is called bubble-free oxygen supply. The oxygen required by the biofilm is supplied through the fiber bundle filler. The hollow fiber membrane not only plays the role of oxygen supply, but also serves as a carrier for fixing the biofilm. That is, pure oxygen or air passes through the micropores of the hollow fiber membrane to perform bubble-free aeration for the biofilm, and the biofilm formed on the outside of the hollow fiber membrane is in full contact with the sewage, and the organic matter contained in the sewage is adsorbed and oxidized and decomposed by the biofilm, so that the sewage is purified and sewage pretreatment is achieved. The membrane assembly 2 of the membrane aeration bioreactor, such as Ceraflo-MABR membrane, can be directly purchased, and its structural principle will not be repeated.

[0035] The multi-level waterfall steps 5 not only serve as a landscape area, but also the water flows freely on the multi-level waterfall steps 5, and energy can be dissipated on it through the form of water drops, ensuring the stability of the water flow and increasing the dissolved oxygen in the water flow, thereby increasing the oxygen content of the water entering the ecological treatment area 15. There is no need to use aeration equipment, and the energy consumption during operation is extremely low.

[0036] The wetland in the ecological treatment area 15 is an artificial wetland, which removes pollutants in sewage by simulating natural wetlands to improve water quality. In addition, in this device, by placing a membrane aeration bioreactor in front of the artificial wetland, the tail water of the sewage treatment plant entering the artificial wetland is pre-treated, the load of the artificial wetland is reduced, and its footprint can be reduced.

[0037] Example 2

[0038] The pretreatment area 13 is provided with a water inlet 1, and the sewage flows into the pretreatment area 13 from the water inlet 1. The pretreatment area 13 is provided with an overflow port 3, and the sewage flows out of the pretreatment area 13 from the overflow port 3.

[0039] Specifically, the tail water of the sewage treatment plant flows into the pretreatment area 13 of the device through the water inlet 1, and is preliminarily treated by the MABR membrane pool in the pretreatment area 13 to remove part of the COD, total nitrogen, total phosphorus and ammonia nitrogen in the water body. The preliminarily treated water flows through the overflow port 3 by gravity into the oxygenated landscape area.

[0040] Example 3

[0041] A water distribution tank 4 is provided in the landscape oxygenation area 14, and a water drop step 5 is located at the outlet side of the water distribution tank 4, and sewage flows into the water distribution tank 4 from the overflow port 3. The multi-level water drop steps 5 are arranged from high to low, and sewage flows from the top water drop step 5 to the bottom water drop step 5, and then flows to the ecological treatment area 15.

[0042] Specifically, the water distribution tank 4 is a tank surrounded by a pool wall and a water distribution tank baffle 6. The water distribution tank baffle 6 is close to the top drop step 5. A plurality of leaking holes are arranged on the water distribution tank baffle 6 along the width direction of the drop step 5. The bottom of the leaking holes is flush with the bottom of the water distribution tank 4 to avoid mud accumulation. The water distribution tank 4 buffers the water flowing out of the overflow port 3 to make the water flow uniform and stable, and then flows out through the leaking holes to the top drop step 5 to achieve water distribution.

[0043] The water flows freely down the waterfall step 5 by gravity flow and enters the ecological treatment area 15. At the same time, it can dissipate energy on it through the form of a water drop to ensure the smooth flow of water. Secondly, it can increase the dissolved oxygen in the water flow, thereby increasing the oxygen content of the water entering the ecological treatment area 15.

[0044] Example 4

[0045] The ecological treatment area 15 is provided with an outlet 11, and the treated water flows out of the ecological treatment area 15 from the outlet 11. An impermeable geotextile 9 is provided at the bottom of the landscape oxygenation area 14 and the ecological treatment area 15. The wetland includes a sandy loam layer 7 and a fine sand layer 8, and the sandy loam layer 7 is located on the upper layer of the fine sand layer 8. The wetland also includes a permeable geotextile 10, and the permeable geotextile 10 is located between the sandy loam layer 7 and the fine sand layer 8. A water outlet well 12 is provided on one side of the ecological treatment area 15, and the water outlet 11 is connected to the water outlet well 12.

[0046] Specifically, the sandy loam layer 7 is the upper matrix in the ecological treatment area 15; the fine sand layer 8 is the lower matrix of the ecological treatment area 15; the permeable geotextile 10 is located between the sandy loam layer 7 and the fine sand layer 8, and is used to divide the two layers so that water can pass through but solid particles cannot, thereby preventing blockage; the anti-seepage geotextile 9 is located at the bottom of the ecological treatment area 15 and the landscape oxygenation area 14 to prevent water leakage.

[0047] The water outlet 11 is located at the end of the ecological treatment area 15 and is the outlet for the water flow of the entire device to flow outward; the water outlet well 12 is used to connect the water flow outside the device to the external pipe network, etc. In addition, a permeable geotextile 10 is also provided at the water outlet 11 to prevent soil loss in the artificial wetland.

[0048] Working mode and principle of this utility model:

[0049] The water flows into the pretreatment area 13 through the water inlet 1, and is preliminarily treated by the MABR membrane pool in the pretreatment area 13 to remove part of the COD, total nitrogen, total phosphorus and ammonia nitrogen in the water body; the preliminarily treated water flows by gravity into the landscape oxygenation area 14 through the overflow port 3, and enters the waterfall step 5 after being distributed through the water distribution trough 4 in front of the waterfall step 5, and in this process, the dissolved oxygen in the water body is increased; the water flows into the water distribution trough 4 in front of the ecological treatment area 15 through the waterfall step 5, and enters the ecological treatment area 15 after being distributed, where the water body is treated again, and the COD, total nitrogen, total phosphorus, ammonia nitrogen, etc. in the water body are removed again; finally, the water enters the outlet well 12 through the outlet 11 and flows into the external water system such as the external pipe network.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An ecological device for treating tail water from a sewage plant in combination with a membrane aeration bioreactor, characterized in that: include: A pretreatment area, wherein a membrane aeration bioreactor membrane assembly is provided in the pretreatment area; A landscape oxygenation area, wherein the landscape oxygenation area is provided with multiple steps of waterfalls; An ecological treatment area, wherein a wetland is provided in the ecological treatment area; The sewage passes through the pretreatment area, the landscape oxygenation area and the ecological treatment area in sequence.

2. The ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor according to claim 1, characterized in that: The pretreatment area is provided with a water inlet, and sewage flows into the pretreatment area from the water inlet.

3. The ecological device for treating tail water of a sewage plant in combination with a membrane aerated bioreactor according to claim 2, characterized in that: The pretreatment area is provided with an overflow port, and the sewage flows out of the pretreatment area from the overflow port.

4. The ecological device for treating tail water of a sewage plant in combination with a membrane aerated bioreactor according to claim 3, characterized in that: A water distribution trough is provided in the landscape oxygenation area, the waterfall step is located at the outlet side of the water distribution trough, and sewage flows into the water distribution trough from the overflow port.

5. The ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor according to claim 4, characterized in that: The multiple levels of the waterfall steps are arranged from high to low, and the sewage flows from the top waterfall step to the bottom waterfall step, and then flows to the ecological treatment area.

6. The ecological device for treating tail water of a sewage plant in combination with a membrane aerated bioreactor according to claim 1, characterized in that: The ecological treatment area is provided with a water outlet, and the treated water flows out of the ecological treatment area from the water outlet.

7. The ecological device for treating tail water of a sewage plant in combination with a membrane aeration bioreactor according to claim 6, characterized in that: The bottom of the landscape oxygenation area and the ecological treatment area is provided with an impermeable geotextile.

8. The ecological device for treating tail water of a sewage plant in combination with a membrane aerated bioreactor according to claim 7, characterized in that: The wetland comprises a sandy loam layer and a fine sand layer, wherein the sandy loam layer is located on the upper layer of the fine sand layer.

9. The ecological device for treating tail water of a sewage plant in combination with a membrane aerated bioreactor according to claim 8, characterized in that: The wetland further comprises a permeable geotextile, and the permeable geotextile is located between the sandy loam layer and the fine sand layer.

10. The ecological device for treating tail water of a sewage plant in combination with a membrane aerated bioreactor according to claim 6, characterized in that: A water outlet well is provided at one side of the ecological treatment area, and the water outlet is connected to the water outlet well.

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