Emergency ecological pond pretreatment system for constructed wetland

Abstract

The invention relates to an emergency ecological pond pretreatment system for a constructed wetland, which comprises: a facultative anaerobic zone used for enabling a water body to enter a facultative anaerobic environment for denitrification reaction; the filler aeration area is connected with the facultative anaerobic area through a water inlet gate, and biodegradable organic pollutants in the water body are removed through the combined action of oxygenation and microorganisms; the settling zone is connected with the filler aeration zone and comprises a sludge treatment system; the water outlet area is communicated with the settling area and is used for lifting outlet water to each subsurface flow wetland treatment unit through a lifting pump; wherein a solar heating plate is arranged at the upper parts of the facultative area and the filler aeration area, so that a closed area is formed and is used for heating a water body. By adopting a form of combining with the constructed wetland, the problem that the quality of effluent of the constructed wetland is unstable is solved, meanwhile, the solar heating system is additionally arranged to heat a water body, the dependence of the water quality improvement effect of the constructed wetland on the temperature can be reduced, the occupied area is greatly reduced, and great market application prospects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of artificial wetland water treatment, and in particular to an emergency ecological pond pretreatment system for artificial wetlands. Background Art

[0002] In artificial wetland water treatment technology, nitrogen removal and phosphorus removal have always been the focus of scholars' research. Nitrogen removal mechanism: Microbial nitrification and denitrification are the main ways of nitrogen removal in artificial wetlands. Nitrification refers to the process of oxidizing ammonia nitrogen into nitrite nitrogen and nitrate nitrogen under aerobic conditions through the action of autotrophic microorganisms nitrite bacteria and nitrate bacteria. Nitrification reaction includes two steps: nitrite and nitrification. Denitrification refers to the process of reducing NO2-N and NO3-N to N2 under anaerobic conditions due to the action of facultative denitrifying bacteria (denitrifying bacteria). Denitrifying bacteria are heterotrophic microorganisms. In the anoxic state, denitrifying bacteria use oxygen in nitrate as an electron acceptor and organic matter as an electron donor to provide energy and be oxidized and stabilized. The optimal growth temperature of nitrite bacteria is 35°C, and the optimal growth temperature of nitrate bacteria is 35-42°C. When it is below 15°C, the nitrification reaction rate drops sharply and stops completely at 5°C.

[0003] The design standards for artificial wetlands generally divide the country into five zones: severe cold zone, cold zone, hot summer and cold winter zone, hot summer and warm winter zone, and mild zone, based on the average temperatures in January and July of each province and city, and taking into account the number of days with annual average daily temperatures of ≤5°C and ≥25°C. From Zone I to Zone V, the temperature gradually increases, the hydraulic retention time continues to decrease, and the land area per unit of water volume gradually decreases. In order to further solve the problem of stable water quality of wetland effluent in low-temperature areas in winter and reduce the area occupied by wetlands, this application adopts a new pretreatment system to effectively reduce the adverse effects of low temperature on denitrification. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide an emergency ecological pond pretreatment system for artificial wetlands, which effectively reduces the adverse effects of low temperature on denitrification.

[0005] The present invention is achieved through the following technical solutions:

[0006] An emergency ecological pond pretreatment system for artificial wetlands, comprising:

[0007] The facultative anoxic zone is used to make the water body enter the facultative anoxic and anaerobic environment to carry out denitrification reaction;

[0008] The filler aeration zone is connected to the facultative anoxic zone through a water inlet gate, and removes biodegradable organic pollutants in the water body through the combined action of oxygenation and microorganisms;

[0009] a sedimentation zone connected to the filler aeration zone, including a sludge treatment system;

[0010] The water outlet area is connected with the sedimentation area and is used to lift the water outlet to each submerged wetland treatment unit through a lifting pump;

[0011] Wherein, a solar heating panel is arranged on the upper part of the anoxic zone and the filler aeration zone to form a closed area for heating the water body.

[0012] According to the above technical solution, preferably, the filler aeration zone includes fillers and oxygen-enhancing aeration equipment located below the fillers.

[0013] According to the above technical solution, preferably, the filler in the filler aeration zone is a rapid-dividing biochemical ball.

[0014] According to the above technical solution, preferably, a nitrification liquid reflux pipeline is provided between the anoxic zone and the filler aeration zone, for refluxing the nitrification liquid in the filler aeration zone to the anoxic zone.

[0015] According to the above technical solution, preferably, a mesh screen plate is provided at the connection between the filler aeration zone and the sedimentation zone to prevent the filler from entering the sedimentation zone.

[0016] According to the above technical solution, preferably, the filler aeration zone includes more than two groups of tank bodies, each of which is provided with a water inlet connected to the anoxic zone and a water outlet connected to the sedimentation zone.

[0017] According to the above technical solution, preferably, the bottom of the sedimentation zone is funnel-shaped, and the sludge treatment system includes a sludge discharge pipe and a lifting pump. The sludge discharge pipe is connected to the bottom of the sedimentation zone to lift and discharge the sludge at the bottom of the pool regularly.

[0018] According to the above technical solution, preferably, a triangular weir is provided at the connection between the sedimentation area and the water outlet area, so that the supernatant in the sedimentation area enters the water outlet area through the triangular weir.

[0019] According to the above technical solution, preferably, the water outlet area is connected to a water quality monitoring device, and the water retention time in the emergency ecological pond is adjusted by the water quality monitoring device.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides an emergency ecological pond pretreatment system, which has built-in oxygenation aeration facilities and biological fillers, imitates the oxygenation biological self-purification process of water bodies in nature, artificially creates oxygenation and strengthens the conditions for the reproduction and growth of aerobic microorganisms, removes biodegradable organic pollutants in sewage through the combined action of oxygenation and microorganisms, and lifts the effluent to each subsurface wetland treatment unit;

[0022] At the same time, the present invention adopts the form of combination with artificial wetlands to solve the problem of unstable water quality of artificial wetland effluent. By adding a solar heating system to heat the water body, the dependence of the artificial wetland water quality improvement effect on temperature can be reduced, the occupied area can be greatly reduced, and it has great market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a main structural schematic diagram of the present invention.

[0024] Figure 2 It is a side view structural schematic diagram of the packing aeration zone of the present invention.

[0025] Figure 3 It is a partial structural schematic diagram of the bottom part of the sedimentation area of ​​the present invention.

[0026] In the figure: 1. Anaerobic zone; 2. Water inlet gate; 3. Air supply pipe; 4. Rapid separation biochemical ball; 5. Grid screen plate; 6. Packing aeration zone; 7. Microporous aerator; 8. Sedimentation zone; 9. Triangular weir; 10. Water outlet zone; 11. Water inlet; 12. Water outlet. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiment. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the invention.

[0028] In the description of the invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the 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. Therefore, they cannot be understood as limitations on the invention.

[0029] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] As shown in the figure, the present invention includes:

[0031] The anoxic zone 1 is used to make the water body enter an oxic and anaerobic environment to carry out denitrification reaction;

[0032] The filler aeration zone 6 is connected to the anoxic zone 1 through the water inlet gate 2, and removes biodegradable organic pollutants in the water body through the combined action of oxygenation and microorganisms;

[0033] a sedimentation zone 8, connected to the filler aeration zone 6, including a sludge treatment system;

[0034] The outlet area 10 is connected to the sedimentation area 8, and the outlet water is lifted to each submerged wetland treatment unit by a lifting pump.

[0035] The emergency ecological pond disclosed in the present application is an open ecological pond, which adopts a reinforced concrete pool body, and the preferred parameters are: pool height 5m, water depth 4.5m, hydraulic retention time ≥8h. Among them, solar heating panels are arranged on the upper part of the anoxic zone 1 and the filler aeration zone 6 to form a closed area for heating the water body, which can reduce the dependence of the water quality improvement effect of the artificial wetland on temperature. At the same time, a nitrification liquid reflux pipeline can also be added between the anoxic zone 1 and the filler aeration zone 6 to make the nitrification liquid in the filler aeration zone 6 reflux to the anoxic zone 1 for denitrification reaction. After the water body enters the filler aeration zone 6, nitrate nitrogen is formed in an aerobic environment. In order to make the nitrate nitrogen further form nitrogen through denitrification reaction, it is necessary to make the water body enter anoxic and anaerobic environment, so it refluxes to the anoxic zone 1, and the reflux method can make the carbon source further utilized.

[0036] The filler aeration zone 6 includes a filler and an oxygenation aeration device located below the filler. In this example, the oxygenation aeration device is preferably, but not limited to, a microporous aerator 7. The aeration device is located near the pond body and is automatically controlled by a PLC. At the same time, a manual control is set on site. The microporous aerator 7 is connected through an air supply pipe 3. The main function is to provide air to the filler aeration zone 6. In addition, in this example, the filler is preferably, but not limited to, a φ100 fast-dividing biochemical ball 4, which refers to a sphere composed of high-quality volcanic rock biological filter materials with uniform diameter and specially treated surfaces and a high-quality polyethylene plastic ball shell. Fast separation is a new technology for organic wastewater treatment. This purification technology does not require pressure, only requires a slight flow of the water body, and the filler is a collection of gravel balls (fast separation balls). The sewage has a fast flow rate outside the sphere and a slow flow rate inside the sphere during flow. The floating objects in the water are concentrated in the slow flow rate to produce fast separation, and combined with biochemical decomposition, it constitutes a fast separation biochemical technology. Microorganisms multiply in large numbers, and the sphere causes the agglomerated solids to move. During the movement, aerobic and anaerobic processes are repeated many times.

[0037] At the same time, a mesh screen plate 5 is provided at the connection between the filler aeration zone 6 and the sedimentation zone 8, and the mesh screen plate 5 is installed at the outlet of the filler aeration zone 6 to prevent the filler from entering the sedimentation zone 8. In addition, in this example, the filler aeration zone 6 preferably but not limited to includes more than two groups of tank bodies, and a water inlet 11 connected to the anoxic zone 1 and a water outlet 12 connected to the sedimentation zone 8 are respectively provided, which can be used at the same time, and can also be switched when one of the tank bodies is maintained, so that the device can work uninterruptedly and ensure the working continuity of the device.

[0038] The bottom of the sedimentation area 8 is funnel-shaped. The sludge treatment system includes a sludge discharge pipe and a lifting pump. The sludge discharge pipe is connected to the bottom of the sedimentation area 8 to regularly lift and discharge the sludge at the bottom of the pool, centrally treat the generated sludge, and effectively reduce the risk of blockage of the artificial wetland.

[0039] In addition, a triangular weir 9 is provided at the connection between the sedimentation area 8 and the outlet area 10, so that the supernatant of the sedimentation area 8 enters the outlet area 10 through the triangular weir 9. The outlet area 10 is connected to a water quality monitoring device, through which the water retention time in the emergency ecological pond is adjusted to ensure that the water quality is stable and meets the standard.

[0040] The present application provides an emergency ecological pond pretreatment system, which has built-in oxygenation and aeration facilities and biological fillers, and a lifting pump is installed at the outlet to lift the outlet water to each submerged wetland treatment unit. As a pretreatment process, the emergency ecological pond imitates the oxygenation biological self-purification process of water bodies in nature, artificially creates conditions for oxygenation and enhanced reproduction and breeding of aerobic microorganisms, and removes biodegradable organic pollutants in sewage through the combined action of oxygenation and microorganisms. At the same time, a solar heating system is added to the emergency ecological pond to heat the water body, which can reduce the dependence of the water quality improvement effect of the artificial wetland on temperature and greatly reduce the floor space. In addition, a sludge treatment system is set in the sedimentation area of ​​the emergency ecological pond to centrally treat the generated sludge, effectively reducing the risk of clogging of the artificial wetland.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An emergency ecological pond pretreatment system for artificial wetlands, characterized in that: include: The facultative anoxic zone (1) is used to make the water body enter the facultative anoxic and anaerobic environment to carry out the denitrification reaction; The filler aeration zone (6) is connected to the anaerobic zone (1) via a water inlet gate (2) and removes biodegradable organic pollutants in the water body through the combined action of oxygenation and microorganisms; A sedimentation zone (8), connected to the filler aeration zone (6), including a sludge treatment system; The water outlet area (10) is connected to the sedimentation area (8) and is used to lift the water outlet to each submerged wetland treatment unit through a lifting pump; Wherein, solar heating panels are arranged on the upper parts of the anoxic zone (1) and the filler aeration zone (6) to form a closed area for heating the water body.

2. According to claim 1, an emergency ecological pond pretreatment system for artificial wetlands is characterized in that: The filler aeration zone (6) comprises fillers and oxygen-enhancing aeration equipment located below the fillers.

3. The emergency ecological pond pretreatment system for artificial wetlands according to claim 2, characterized in that: The filler in the filler aeration zone (6) is a fast-dividing biochemical ball (4).

4. The emergency ecological pond pretreatment system for artificial wetlands according to any one of claims 1 to 3, characterized in that: A nitrification liquid reflux pipeline is provided between the anoxic zone (1) and the filler aeration zone (6), and is used to allow the nitrification liquid in the filler aeration zone (6) to reflux to the anoxic zone (1).

5. An emergency ecological pond pretreatment system for artificial wetlands according to claim 2 or 3, characterized in that: A mesh screen plate (5) is provided at the connection between the filler aeration zone (6) and the sedimentation zone (8) to prevent the filler from entering the sedimentation zone (8).

6. The emergency ecological pond pretreatment system for artificial wetlands according to claim 1, characterized in that: The filler aeration zone (6) comprises more than two groups of tank bodies, each of which is provided with a water inlet (11) connected to the anoxic zone (1) and a water outlet (12) connected to the sedimentation zone (8).

7. The emergency ecological pond pretreatment system for artificial wetlands according to claim 1, characterized in that: The bottom of the sedimentation zone (8) is funnel-shaped. The sludge treatment system comprises a sludge discharge pipe and a lifting pump. The sludge discharge pipe is connected to the bottom of the pool in the sedimentation area (8) and regularly lifts and discharges the sludge at the bottom of the pool.

8. The emergency ecological pond pretreatment system for artificial wetlands according to claim 7, characterized in that: A triangular weir (9) is provided at the connection between the sedimentation area (8) and the water outlet area (10), so that the supernatant of the sedimentation area (8) enters the water outlet area (10) through the triangular weir (9).

9. The emergency ecological pond pretreatment system for artificial wetlands according to claim 1, characterized in that: The water outlet area (10) is connected to a water quality monitoring device, and the water retention time in the emergency ecological pond is adjusted by the water quality monitoring device.

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