Backwashing system for sewage treatment constructed wetland

Abstract

The utility model discloses a backwashing system for sewage treatment constructed wetland capable of reducing operation cost, the constructed wetland comprises a wetland main body structure and a backwashing pipeline structure, the backwashing pipeline structure comprises a main pipe penetrating through the wetland main body structure, the main pipe is arranged in an n-shaped bending manner, the main pipe is connected with a branch pipe provided with a washing hole, and the washing hole is communicated with the main pipe. The inlet end of the main pipe is connected with the water distribution well through a pipeline provided with a first water delivery pump, the air blower is connected to the inlet end of the first water delivery pump through an air blowing pipe, and the outlet end of the main pipe is connected with the filter tank through a pipeline provided with a water suction pump. And the filter tank is connected to the outlet end of the first water delivery pump through a pipeline provided with a second water delivery pump. The backwashing pipeline structure not only can be used for conveying washing water, but also can be combined with an air blower and an air blowing pipe for aeration, not only can realize the backwashing of the artificial wetland filler, but also has an oxygenation function, and the backwashing water can be reused.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of artificial wetlands, especially a backwashing structure of artificial wetland. BACKGROUND

[0002] Artificial wetland is a kind of sewage ecological treatment engineering technology developed in recent decades, mainly through sedimentation, adsorption, filtration, decomposition, plant absorption, microbial decomposition and other ways to purify pollutants and suspended solids in sewage. It combines sewage treatment and environmental ecology organically, beautifies the environment while effectively treating sewage, creates an ecological landscape, and is widely concerned for its unique advantages, and is widely used in treating domestic sewage, industrial wastewater, mine and oil exploitation wastewater, especially in the field of decentralized rural sewage treatment. Artificial wetland, whether construction or operation, has lower cost investment and does not require professional management compared with other technologies.

[0003] At present, artificial wetland is applied in the use process of rural sewage treatment, and the following deficiencies are found: (1) low reoxygenation capacity: the internal oxygen supply of traditional artificial wetland mainly depends on plant root oxygen secretion to provide oxygen for the wetland. Therefore, in winter, the vegetation withers, the dissolved oxygen concentration in the wetland is low, which leads to the reduction of the removal efficiency of pollutants by the wetland. At present, most of the wetlands used are subsurface flow artificial wetlands. Compared with vertical flow artificial wetlands, horizontal flow artificial wetlands lack good oxygen environment, and the dissolved oxygen concentration in the wetland is low, which leads to the reduction of the nitrification capacity in the wetland; (2) substrate clogging: long-term operation of artificial wetland will cause substrate clogging. The wetland surface filler will accumulate some extracellular polymers secreted by microorganisms and plant litters, which leads to the formation of high-water-content, low-density gel sludge, and finally causes the wetland to be clogged. Or the adsorption of filler reaches saturation state, the suspended solids content in the influent is too large, and the substrate is clogged, which affects the use effect of artificial wetland.

[0004] The patent document with publication number CN216106520U discloses a modular constructed wetland filler device, which comprises a pool body, a modular unit stacked in the pool body, and a backwashing device. The upper end of the pool body is respectively provided with a filter screen layer, a soil layer, and an aquatic plant layer. The modular unit comprises a net box and a filler filled in the net box. The backwashing device comprises a flushing device body arranged between the upper and lower modular units. One side of the pool body is provided with a water storage tank. One end of the water storage tank is provided with a two-way water pipe. A gas pump is arranged between the water storage tank and the two-way water pipe. The two-way water pipe is in communication with the upper and lower modular units, respectively. An ultrasonic generator is arranged inside the net box. A sewage discharge pipe is arranged outside the net box. The flushing device body comprises a horizontally arranged main water pipe and a plurality of branch water pipes arranged on the main water pipe. Nozzles are arranged on the branch water pipes. One end of the main water pipe is provided with a booster pump. The above device is provided with a modular filler unit, which facilitates the replacement of the filler. The backwashing device and ultrasonic vibration are arranged between the upper and lower modular units, which can improve the flushing effect. The two-way water pipe is respectively inserted into the upper and lower fillers, which improves the purification effect.

[0005] However, the above device has a large water consumption during backwashing, and the flushing water cannot be recycled, which needs to be further improved. Practical new type content

[0006] The technical problem to be solved by the present application is to provide a backwashing system for wastewater treatment constructed wetland, which can reduce operation cost.

[0007] The utility model discloses a technical scheme that solves its technical problem is: for sewage treatment artificial wetland's backwashing system, the artificial wetland includes wetland main body structure and backwashing pipeline structure, backwashing pipeline structure includes the main pipe of through wetland main body structure and is arranged in the inside of wetland main body structure and is connected with the branch pipe of main pipe, wherein the branch pipe is provided with the flushing hole, the main pipe is arranged in the'several'character shape bending in the wetland main body structure, the branch pipe is layered distribution and interval distribution between the branch pipe of same layer in the inside of wetland main body structure in height direction, the import end of main pipe is connected with the distribution well through the pipeline that is provided with first water delivery pump, and the inlet end of first water delivery pump is connected to the blower fan through the blast pipe, and the outlet end of main pipe is connected with the filter tank through the pipeline that is provided with the water pump, and the upper portion of filter tank is provided with filter screen structure, and the outlet end of first water delivery pump is connected to the pipeline that is provided with second water delivery pump. The contact area of backwashing pipeline structure and the filler in the inside of artificial wetland is larger, can expand the influence scope of flushing under the condition that there is already existence block, improves the flushing effect, saves the flushing time, and the backwashing pipeline structure can be used for the delivery of flushing water, and can be combined with the blower fan and the blast pipe for aeration, can realize the backwashing of artificial wetland filler, and has the oxygenation function, enhances the effect of sewage disposal and oxygenation, and the water resource in filter tank can be used again, realizes the recycling of backwashing water, reduces the overall water consumption.

[0008] The filter screen structure includes two layers of filter screens and a bottom layer of filter screen baskets filled with activated carbon, wherein the mesh of the upper filter screen is larger than that of the lower filter screen. The purpose is to filter the water sucked into the filter tank and then use it again, i.e., send it back to the main pipe for backwashing.

[0009] A first switch valve is arranged on the pipeline between the distribution well and the first water delivery pump, a second switch valve is arranged on the pipeline between the water pump and the filter tank, and a third switch valve is arranged on the blast pipe. The switch valves are arranged at corresponding positions on the pipeline according to conventional design to cooperate with the start and stop of the first water delivery pump, the water pump or the blower fan, realize corresponding backwashing operations such as air washing and water washing, and complete filler regeneration.

[0010] An ultrasonic vibration rod is further arranged in the filler layer inside the wetland main body structure, and the ultrasonic vibration rod is connected with an ultrasonic generator through an ultrasonic switch device, so that cleaning and filler regeneration can be performed by ultrasonic waves.

[0011] Further, the backwashing system further comprises a PLC controller, water pressure testing devices are arranged at the water inlet and the water outlet of the wetland main body structure 1 respectively, the PLC controller controls the opening and closing of the water inlet and the water outlet, and the opening and closing of the first switch valve 22, the second switch valve 27, the third switch valve 33 and the ultrasonic switch device 42 according to signals of the water pressure testing devices and preset time signals. When the pressure difference between the water inlet and the water outlet exceeds a certain threshold value, the water inlet and the water outlet are closed, the first switch valve 22, the second switch valve 27, the third switch valve 33 and the ultrasonic switch device 42 are sequentially opened and kept open for a certain time according to a set opening program, and the filler layer is automatically backwashed to restore the sewage treatment function of the artificial wetland.

[0012] The artificial wetland backwashing system has the advantages that backwashing of the filler of the artificial wetland can be realized, oxygenation is achieved, the backwashing water can be recycled, water resources are saved, the system can realize combination of multiple modes such as "air washing", "water washing" and "ultrasonic wave", the sewage treatment effect of the artificial wetland is improved, and the service life of the artificial wetland is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic view of the overall structure of the artificial wetland backwashing system for sewage treatment.

[0014] Figure 2 is Figure 1 a plan view of the backwashing pipeline structure in the artificial wetland backwashing system.

[0015] Figure 3 is Figure 1 an axonometric view of the backwashing pipeline structure in the artificial wetland backwashing system.

[0016] In the drawing, 1 is a wetland main body structure, 2 is a water pressure testing device, 3 is a PLC controller, 21 is a water distribution well, 22 is a first switch valve, 23 is a first water pump, 24 is a main pipe, 25 is a branch pipe, 26 is a water pump, 27 is a second switch valve, 28 is a filter tank, 29 is a second water pump, 31 is a blower, 32 is a blower pipe, 33 is a third switch valve, 41 is an ultrasonic wave generator, 42 is an ultrasonic switch device, 43 is an ultrasonic wave vibrator, 51 is an upper filter screen, and 52 is a lower filter screen. DETAILED DESCRIPTION

[0017] The artificial wetland backwashing system will be further described below with reference to the drawings.

[0018] For example, Figure 1 , Figure 2 and Figure 3As shown, the backwashing system for the artificial wetland for sewage treatment of the utility model, the artificial wetland includes wetland main body structure 1 and backwashing pipeline structure, wetland main body structure 1 is equipped with water inlet, drain outlet (omitted in the drawing) for the sewage to be treated to enter and exit artificial wetland, and the wetland main body structure 1 includes filler layer inside, the backwashing pipeline structure includes main pipe 24 through wetland main body structure 1 and branch pipe 25 connected with main pipe 24, the flush hole is arranged on branch pipe 25, flush hole is usually evenly opened on branch pipe 25, wherein branch pipe 25 is mainly arranged in the filler layer inside wetland main body structure 1, for air washing and water washing of filler, the inlet end of main pipe 24 is connected with distribution well 21 through the pipeline with first water pump 23, first switch valve 22 is arranged on the pipeline between distribution well 21 and first water pump 23, air blower 31 is connected to the inlet end of first water pump 23 through blast pipe 32, third switch valve 33 is arranged on blast pipe 32, the outlet end of main pipe 24 is connected with filter tank 28 through the pipeline with water pump 26, obviously, the position of the pipeline outlet should be located above the filter screen structure on the upper portion of filter tank 28, second switch valve 27 is arranged on the pipeline between water pump 26 and filter tank 28, filter tank 28 is connected to the outlet end of first water pump 23 through the pipeline with second water pump 29, ultrasonic vibration rod 43 is further arranged in the filler layer inside wetland main body structure 1, ultrasonic vibration rod 43 is connected with ultrasonic generator 41 through ultrasonic switch device 42, ultrasonic vibration rod 43 can be multiple and is arranged at intervals inside wetland main body structure 1, when ultrasonic generator 41 is started and ultrasonic switch device 42 is opened, ultrasonic vibration rod 43 vibrates, so that the filler of filler layer is loose, the backwashing effect of air washing and / or water washing is improved, and the backwashing time is saved.

[0019] If the volume of wetland main body structure is large, two or more than two parallel and interval arranged main pipes can be used to construct backwashing pipeline.

[0020] As Figure 1 , Figure 2 and Figure 3 As shown, by controlling the opening and closing of third switch valve 32 and first switch valve 22, gas and water can be transported to branch pipe 25 and its surrounding area, each branch pipe 25 is distributed in the height direction and is distributed at intervals between branch pipes 25 in the same layer inside wetland main body structure 1, main pipe 24 is arranged in "J" shape and is connected to the middle position of each branch pipe 25, which increases the contact area with the filler inside artificial wetland, expands the influence range of flushing, and enhances the effect of sewage removal and oxygenation.

[0021] As Figure 1As shown, the filter screen structure includes two layers of filter screen and the bottom layer of filter screen basket filled with activated carbon, the mesh of the upper filter screen 51 is 150-250 microns, the mesh of the lower filter screen 52 is 40-100 microns, the washing water filtered by coarse filtering and re-filtering and the activated carbon filter screen basket adsorption enters the filter tank 28 for storage, and can be sent into the main pipe 24 by the second water pump 29 for re-flushing, so as to realize the recycling of the washing water.

[0022] As shown in the figure, Figure 1 As shown, the backwashing system further comprises a PLC controller 3, water pressure testing devices 2 are arranged at the water inlet and the water outlet of the wetland main body structure 1 respectively, the PLC controller 3 controls the opening and closing of the water inlet and the water outlet and the opening and closing of the first switch valve 22, the second switch valve 27, the third switch valve 33 and the ultrasonic switch device 42 according to the signals of the water pressure testing devices 2 and the preset time signals. When the pressure difference between the water inlet and the water outlet exceeds a certain threshold value, the water inlet and the water outlet are closed, and then the first switch valve 22, the second switch valve 27, the third switch valve 33 and the ultrasonic switch device 42 are sequentially opened and kept for a certain time according to the set opening program, so as to automatically backwash the filler layer and restore the sewage treatment function of the constructed wetland. In the backwashing system for the constructed wetland for sewage treatment, the aeration and the backwashing water share the main pipe and the branch pipe arranged in the wetland main body structure 1, when oxygen is needed, the third switch valve 32 and the air blower 31 are opened, when backwashing is needed, the first water pump 23 and the first switch valve 22 and the second switch valve 27 are opened, the water in the water distribution well 21 is pumped out and transported to the inside of the constructed wetland, after a period of time of flushing, the water pump 26 is opened, the sewage accumulated in the wetland is pumped to the upper part of the filter tank 28 and filtered, and the filtered water can be recycled by opening the second water pump 29 and entering the main pipe 24, which can save the flushing water and the pipeline layout cost, and can adopt multiple modes such as "air washing", "water washing" and "ultrasonic wave", combined with multiple cycle periods, to enhance the effect of the backwashing system and the flushing effect, and long-time operation can improve the effluent indicators of the constructed wetland. Therefore, the backwashing system for the constructed wetland for sewage treatment is more reasonable.

Claims

1. A backwash system for sewage treatment constructed wetland, the constructed wetland comprising a wetland main body structure (1) and its water inlet, water outlet and backwash pipeline structure, the water inlet and water outlet being controllable to open and close, the backwash pipeline structure comprising a main pipe (24) penetrating through the wetland main body structure (1) and a branch pipe (25) arranged inside the wetland main body structure (1) and connected with the main pipe (24), wherein the branch pipe (25) is provided with a washing hole, characterized in that: The main pipe (24) is arranged in a "U" shape in the wetland body structure (1), the branch pipes (25) are arranged in layers in the height direction inside the wetland body structure (1) and are arranged at intervals between the branch pipes (25) in the same layer, the inlet end of the main pipe (24) is connected with the water distribution well (21) through a pipeline provided with a first water delivery pump (23), the air blower (31) is connected to the inlet end of the first water delivery pump (23) through an air blowing pipe (32), the outlet end of the main pipe (24) is connected with the filter tank (28) through a pipeline provided with a water pumping pump (26), the upper part of the filter tank (28) is arranged with a filter screen structure, and the filter tank (28) is connected to the outlet end of the first water delivery pump (23) through a pipeline provided with a second water delivery pump (29).

2. The backwash system for a wastewater treatment constructed wetland of claim 1, wherein: The filter screen structure comprises upper and lower filter screens and a filter screen basket filled with activated carbon at the bottom, wherein the mesh of the upper filter screen (51) is larger than that of the lower filter screen (52).

3. The backwash system for a wastewater treatment constructed wetland of claim 1, wherein: A first switch valve (22) is arranged on the pipeline between the water distribution well (21) and the first water delivery pump (23), a second switch valve (27) is arranged on the pipeline between the water pumping pump (26) and the filter tank (28), and a third switch valve (33) is arranged on the air blowing pipe (32).

4. The backwash system for a wastewater treatment constructed wetland of claim 3, wherein: An ultrasonic vibration rod (43) is further arranged in the filler layer inside the wetland body structure (1), and the ultrasonic vibration rod (43) and an ultrasonic generator (41) are connected through an ultrasonic switch device (42).

5. The backwash system of claim 4, wherein: Further comprising A PLC controller, water pressure testing devices are arranged at the water inlet and the water outlet of the wetland body structure (1), and the PLC controller controls the opening and closing of the water inlet and the water outlet, the first switch valve (22), the second switch valve (27), the third switch valve (33) and the ultrasonic switch device (42) according to the signals of the water pressure testing devices and the preset time signals.

6. The backwash system for wastewater treatment constructed wetlands according to claim 1 or 2, characterized in that: An ultrasonic vibration rod (43) is further arranged in the filler layer inside the wetland body structure (1), and the ultrasonic vibration rod (43) and an ultrasonic generator (41) are connected through an ultrasonic switch device (42).

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