Ecological purification pond and phosphorus removal method thereof

Abstract

The ecological purification pond provided by the present invention comprises: a purification pond module, the purification pond module comprises a primary ecological pond and a secondary ecological pond, the primary ecological pond and the secondary ecological pond are separated from each other and connected through a connecting pipe, the slopes and the bottom of the primary ecological pond and the secondary ecological pond are backfilled with quicklime mixed with on-site loam, a return well and a water level regulating well are provided between the primary ecological pond and the secondary ecological pond, which are used to regulate the water level in the primary ecological pond and the secondary ecological pond, and a water extraction aeration device connected to the return well is provided in the primary ecological pond. The phosphorus removal method of the ecological purification pond provided by the present invention utilizes the storage of calcium hydroxide in the slope and the bottom of the ecological purification pond, precipitation due to water level changes, water extraction aeration mixing, calcium carbonate promotion of flocculation and precipitation, infiltration island adsorption and interception, and submerged plant pH regulation to achieve a deep phosphorus removal effect.

Description

Technical Field

[0001] The invention relates to the field of ecological purification, and in particular to an ecological purification pond and a phosphorus removal method thereof. Background Art

[0002] With the development of social economy and the advancement of ecological civilization construction, the healthy and sustainable development of water ecosystems has attracted much attention. The high content of nutrient element phosphorus is the primary limiting factor for eutrophication of water bodies at present, and it is also a limiting factor in water environment fields such as recycled water reuse and artificial wetland sewage treatment. Exploring ecological and economic methods to deeply reduce the phosphorus concentration in water bodies, promote the recycling and reuse of water resources, and ensure the health of water ecosystems is a major problem at present.

[0003] At present, phosphorus removal from polluted water bodies mostly adopts chemical phosphorus removal equipment such as adding agents, artificial wetlands and other ecological engineering measures, but the phosphorus removal effect is limited, it is difficult to achieve deep phosphorus removal, and it cannot meet the needs of water ecosystem restoration. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the existing ecological engineering technology that it is difficult to deeply remove phosphorus, thereby providing an ecological purification pond and a phosphorus removal method thereof.

[0005] The present invention provides an ecological purification pond, comprising: a purification pond module, wherein the purification pond module comprises a primary ecological pond and a secondary ecological pond, wherein the primary ecological pond and the secondary ecological pond are separated from each other and connected through a connecting pipe, wherein the side slopes and the bottom of the primary ecological pond and the secondary ecological pond are backfilled with a mixture of quicklime and on-site loam, wherein a reflow well and a water level regulating well are arranged between the primary ecological pond and the secondary ecological pond, for regulating the water levels in the primary ecological pond and the secondary ecological pond, and wherein a water-lifting aeration nozzle connected with the reflow well is arranged in the primary ecological pond.

[0006] Optionally, a reflux pump is arranged in the reflux well, and the reflux pump is connected to the water-lifting aeration nozzle through a reflux pipe arranged in the primary ecological pond. The reflux pump draws water from the secondary ecological pond to the reflux well through the reflux pipe, regulates the water level change, and lifts water at the same time, and the water-lifting aeration nozzle forms fountain aeration in the mixed flow area of ​​the primary ecological pond.

[0007] Optionally, the reflow well and the water level regulating well are used to regulate the periodic rise and fall of the water levels in the primary ecological pond and the secondary ecological pond.

[0008] Optionally, a seepage island is provided in the primary ecological pond, which is connected to the water level regulating well through a connecting pipe. The seepage island is evenly distributed in the primary ecological pond near the side of the dike, preferably, in the primary ecological pond near the side of the dike, which occupies 1 / 3 of the area of ​​the primary ecological pond.

[0009] Optionally, the filler of the infiltration island is calcareous gravel.

[0010] Optionally, a water-collecting steel cage is provided in the infiltration island. The water-collecting steel cage is connected to the connecting pipe and is connected to the water level regulating well through the connecting pipe to communicate with the secondary ecological pond. The water-collecting steel cage is suitable for collecting water from the primary ecological pond that is filtered and purified by the infiltration island and is about to enter the secondary ecological pond.

[0011] Optionally, the shallow water area of ​​the ecological purification pond is planted with emergent plants, and the deep water area is planted with submerged plants.

[0012] Optionally, emergent plants such as reeds and sedge are planted around the shallow water area of ​​the ecological purification pond, and submerged plants such as foxtail algae and black algae are planted in the deep water area.

[0013] Optionally, a water-lifting aerator is also provided in the secondary ecological pond.

[0014] Optionally, the ecological purification pond includes a plurality of purification pond modules arranged in parallel.

[0015] Optionally, the primary ecological pond and the secondary ecological pond are arranged independently or connected.

[0016] Optionally, the first-level ecological pond is provided with a water inlet, and the second-level ecological pond is provided with a water outlet.

[0017] Optionally, the primary ecological pond and the secondary ecological pond are separated by an impermeable embankment, and an overflow port is provided in the area adjacent to the water level regulating well at the upper end of the embankment. When the water level in the primary ecological pond is higher than the overflow port, the water enters the water level regulating well.

[0018] Optionally, the number of infiltration islands, water level regulating wells, and overflow outlets is equal, which is 1-3.

[0019] Optionally, the weight ratio of quicklime to on-site loam on the slope is (1-3): (9-7), and the weight ratio of quicklime to on-site loam on the bottom of the pond is (0.5-1): (9.5-9). Optionally, the reflow well is located on the side of the secondary ecological pond adjacent to the dike, and the reflow well is connected to the reflow pipes arranged in the secondary ecological pond and the primary ecological pond.

[0020] Optionally, the water level regulating well is located on one side of the secondary ecological pond adjacent to the partition.

[0021] Optionally, a water level regulating pipe and a water outlet control valve are provided in the water level regulating well. The water outlet control valve is used to control the amount of water entering the secondary ecological pond from the primary ecological pond. The present application also provides a phosphorus removal method for the above ecological purification pond, which comprises the following steps:

[0022] Intermittent water inflow: phosphorus-contaminated water is intermittently introduced into the primary ecological pond, mixed with the return water introduced by the water lifting and aeration device, and then treated in the primary ecological pond before entering the secondary ecological pond for treatment;

[0023] Intermittent reflow: The water in the reflow well is intermittently led back to the primary ecological pond through the water lifting aeration device;

[0024] Outlet: The water discharged after being purified in the secondary ecological pond;

[0025] The water level difference between the primary ecological pond and the secondary ecological pond and the duration of the water level difference are regulated by intermittent water inflow, intermittent backflow and water level regulating wells. In addition, during the treatment of phosphorus-contaminated water, the lowest water levels of the primary ecological pond and the secondary ecological pond are both lower than the elevation of the shallow top of the slope.

[0026] Optionally, the phosphorus removal method of the ecological purification pond also includes the following steps: the phosphorus-contaminated water will be filtered, adsorbed and purified through the infiltration island before entering the secondary ecological pond from the primary ecological pond, and then enter the water level regulating well through the connecting pipe, and enter the secondary ecological pond after being regulated by the water level regulating well.

[0027] Optionally, the intermittent water inflow is 3-6 times a day, each time for 1-0.5 hours, and the intermittent return flow is 3-6 times a day, each time for 1-0.5 hours. The intermittent water inflow and the intermittent return flow are synchronized, and the return flow rate is 1-3 times the water inflow flow rate. The surface hydraulic load of the ecological purification pond is 0.1m 3 / (m 2 d)-0.2m 3 / (m 2 ·d), the water level difference between the primary ecological pond and the secondary ecological pond is 1.0m-1.5m. The present invention also provides an application of the above ecological purification pond in phosphorus removal.

[0028] The technical solution of the present invention has the following characteristics:

[0029] 1. The ecological purification pond provided by the present invention uses quicklime mixed with on-site loam on the slope and the bottom of the pond to form calcium hydroxide storage, and the water level in the primary ecological pond and the secondary ecological pond is adjusted by the return well and the water level regulating well to continuously rise and fall, promote the gradual precipitation of calcium ions in the slope, and react with phosphate in the water to achieve the purpose of slow-release long-term phosphorus removal. Specifically, the calcium ions on the slope and the bottom of the purification pond module react with the phosphate in the water to form hydroxyapatite (5Ca 2+ +OH - +3PO4 3- =Ca5(OH)(PO4)3). In addition, the aeration and mixing of reflux water can promote the reaction between phosphate and calcium ions in lime on the one hand, and promote carbon dioxide to enter the water and react with calcium ions to form calcium carbonate particles on the other hand, promote the flocculation and precipitation of hydroxyapatite, and also help to neutralize alkalinity.

[0030] 2. The ecological purification pond provided by the present invention has a percolation island in the first-level ecological pond, which is connected to the water level regulating well through a connecting pipe, so that the water in the first-level ecological pond is filtered and adsorbed before entering the second-level ecological pond.

[0031] In addition, the filler of the filtration island is calcareous gravel, which can also play a role in adsorption to form crystal nuclei, promote the crystallization of hydroxyapatite, and enhance the phosphorus removal effect.

[0032] 3. The ecological purification pond provided by the present invention has aquatic plants planted in both the shallow and deep water areas of the ecological purification pond, which can promote the increase of water pH through photosynthesis, and the increase of pH will promote the precipitation of hydroxyapatite from water, thereby improving the phosphorus removal effect. At the same time, the plants also provide an attachment carrier for the solidification and precipitation of phosphorus. When the water pH ranges from 9.5 to 10, the phosphorus removal effect is best.

[0033] 4. The phosphorus removal method for the ecological purification pond provided by the present invention utilizes the calcium hydroxide storage on the slope and bottom of the ecological purification pond, precipitation due to water level changes, water extraction and aeration mixing, calcium carbonate-promoted flocculation and precipitation, infiltration island adsorption and interception, and submerged plant pH regulation to achieve a deep phosphorus removal effect.

[0034] 5. In the ecological purification pond provided by the present invention, when the amount of water to be processed is small, the number of the purification pond modules is set to 1; when the amount of water to be processed is large, the number of the purification pond modules is set to multiple. By setting up a number of purification pond modules, the phosphorus removal needs of different water volumes can be met.

[0035] 6. The phosphorus removal method for the ecological purification pond provided by the present invention does not require complicated electrical control, has a simple process, convenient operation and management, small construction investment, low operating cost, good water purification effect, can be flexibly laid out according to local conditions, and has significant economic, environmental and ecological benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a schematic diagram of the structure of the ecological purification pond provided in Example 1 of the present invention;

[0038] Figure 2 yes Figure 1 The schematic diagram of the cross-sectional structure of the ecological purification pond at position AA is shown;

[0039] Figure 3 yes Figure 1 The schematic diagram of the cross-sectional structure of the ecological purification pond BB shown;

[0040] Reference numerals:

[0041] 1- purification pond module; 2- primary ecological pond; 3- secondary ecological pond; 4- connecting pipe; 5- return well; 6- slope; 7- pool bottom; 8- water inlet; 9- water outlet; 10- partition; 11- return pipe; 12- return pump; 13- water-lifting aeration nozzle; 14- water level regulating well; 15- water level regulating pipe; 16- water outlet control valve; 17- overflow; 18- infiltration island; 19- water collection steel cage; 20- emergent plants; 21- submerged plants. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, 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 communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Example 1

[0047] This embodiment provides an ecological purification pond, see Figures 1 to 3 , including: a purification pond module 1 with a number of 1 and a rectangular plane shape, the purification pond module 1 includes a first-level ecological pond 2 and a second-level ecological pond 3 arranged in a connected manner, the first-level ecological pond 2 is a deep pond, and the second-level ecological pond 3 is a shallow pond. The first-level ecological pond 2 and the second-level ecological pond 3 are separated by an impermeable dam 10 and connected through a connecting pipe 4. An overflow port 17 is also provided in the area adjacent to the water level regulating well 14 at the upper end of the dam 10 of the ecological purification pond, and when the water level in the first-level ecological pond 2 is higher than the overflow port 17, the water enters the water level regulating well 14. A reflow well 5 and a water level regulating well 14 are provided between the first-level ecological pond 2 and the second-level ecological pond 3, and a water-lifting aeration nozzle 13 connected to the reflow well 5 is provided in the first-level ecological pond.

[0048] It should be noted that, in other embodiments, the plane shape of the purification pond module can be appropriately deformed in combination with local terrain conditions.

[0049] The side slope 6 and the bottom 7 of the primary ecological pond 2 and the secondary ecological pond 3 are backfilled with quicklime mixed with on-site loam, wherein the weight ratio of quicklime to on-site loam of the side slope 6 is 1:4, and the weight ratio of quicklime to on-site loam of the bottom 7 is 1:9.

[0050] The first-level ecological pond 2 is provided with a water inlet 8 , and the second-level ecological pond 3 is provided with a water outlet 9 .

[0051] A reflow well 5 is provided between the primary ecological pond 2 and the secondary ecological pond 3, and the reflow well 5 is located on one side of the secondary ecological pond 3 adjacent to the partition 10. The reflow well 5 is connected to a reflow pipe 7 provided in the secondary ecological pond 3 and the primary ecological pond 2.

[0052] A reflux pump 12 is provided in the reflux well 5. The reflux pump 12 is connected to the water-lifting aeration nozzle 13 through the reflux pipe 7 provided in the primary ecological pond. The reflux pump 12 draws water from the secondary ecological pond 3 to the reflux well via the reflux pipe 7, regulates the water level change, and lifts water at the same time, and the water-lifting aeration nozzle 13 forms fountain aeration in the mixed flow area of ​​the primary ecological pond 2.

[0053] A water level regulating well 14 is provided between the primary ecological pond 2 and the secondary ecological pond 3 . The water level regulating well 14 is located on one side of the secondary ecological pond 3 adjacent to the partition 10 .

[0054] The water level regulating well 14 is provided with a water level regulating pipe 15 and a water outlet control valve 16 . The water outlet control valve 16 is used to control the amount of water entering the secondary ecological pond 3 from the primary ecological pond 2 .

[0055] Specifically, the water level regulating pipe 15 is connected by a movable straight sleeve and a short pipe joint, without gluing, and the short pipe joint can be replaced to control the overflow height, and the water level regulating pipe 15 should be fixed to the pipe wall to avoid shaking. The water outlet control valve 16 adopts a plastic butterfly valve and is fixedly installed.

[0056] Through the combination of intermittent water inflow, intermittent backflow and the water level regulating pipe 15, the water level difference between the primary ecological pond 2 and the secondary ecological pond 3 can be 1.0m-1.5m. The duration of the water level difference between the primary ecological pond 2 and the secondary ecological pond 3 can be regulated by the water level regulating pipe 15 and the water outlet control valve 16, and the water level difference duration can be manually set within 24 hours.

[0057] The return well 5 and the water level regulating well 14 are used to regulate the water levels in the primary ecological pond 2 and the secondary ecological pond 3 to rise and fall periodically. In addition, during the treatment of phosphorus-contaminated water, the low water levels of the secondary ecological pond 3 and the primary ecological pond 2 are lower than the ground of the slope 6 in each ecological pond. Figure 2 As shown, the low water level height (L1) of the first-level ecological pond 2 is lower than the ground height (L2) of the slope 6 in the first-level ecological pond 2; the low water level height (L3) of the second-level ecological pond 3 is lower than the ground height (L4) of the slope 6 in the first-level ecological pond 3.

[0058] The primary ecological pond 2 is provided with a filtration island 18, which is connected to the water level regulating well 14 through a connecting pipe 4. The filtration island 18 is evenly distributed in the primary ecological pond 2 near the side of the dike 10, which occupies 1 / 3 of the area of ​​the primary ecological pond 2. The filler of the filtration island 18 is calcareous gravel. In this embodiment, the number of the water level regulating well 14, the filtration island 18, the connecting pipe 4, and the overflow port 17 is equal, which is 2.

[0059] The infiltration island 18 is provided with a water collection steel cage 19, which is connected to the connecting pipe 4 and connected to the water level regulating well 14 through the connecting pipe 4, so as to be connected to the secondary ecological pond 3. The water collection steel cage 19 is suitable for collecting water from the primary ecological pond to be filtered and purified by the infiltration island 18 and to enter the secondary ecological pond 2.

[0060] The shallow water plants 20 planted around the shallow water area of ​​the ecological purification pond are reeds and sedges, and the submerged plants 21 planted in the deep water area are foxtail algae and black algae.

[0061] It should be noted that, in other embodiments, a water-lifting aerator may be further provided in the secondary ecological pond 3 to promote the reaction between phosphate and calcium ions in lime, further improve the phosphorus removal effect, and ensure smooth water discharge.

[0062] The specific implementation steps and precautions of this embodiment are:

[0063] (1) Determine the surface hydraulic load based on the influent water quality, water volume, and land use conditions. When the total phosphorus concentration in the influent is high, select a low hydraulic load of 0.1 m 3 / (m 2 ·d); When the total phosphorus concentration of the influent is low, select a high hydraulic load of 0.2m 3 / (m 2 ·d).

[0064] (2) Determine the area of ​​the ecological purification pond based on the selected hydraulic load and the amount of water to be treated.

[0065] (3) The layout of the ecological purification pond is clarified, that is, the first-level ecological pond unit and the second-level ecological pond are arranged in a connected manner. The plane shape of the ecological purification pond module of the present invention can be appropriately deformed according to the terrain conditions and is not limited to a square or rectangle. When the amount of water to be treated is large, it is necessary to set up a number of parallel purification pond modules.

[0066] (5) An impermeable dam and overflow outlet are set between the primary ecological pond and the secondary ecological pond, and a return well and a water level regulating well are set on the side of the secondary ecological pond adjacent to the dam. The number of water level regulating wells is 2.

[0067] (6) Install water-lifting aeration nozzles in the primary ecological pond.

[0068] (7) Two infiltration islands are evenly distributed in the primary ecological pond, and water collection steel cages and connecting pipes are installed inside the infiltration islands.

[0069] (8) Water level regulating pipes and water outlet control valves are laid in the water level regulating well.

[0070] (9) A reflux pump is arranged in the reflux well, and the reflux pump is connected to the water-lifting aeration nozzle through a reflux pipe arranged in the primary ecological pond.

[0071] (10) Reeds and sedges are planted in the shallow water area around the ecological pond, with the planting rate of reeds and sedges being 10 clumps per square meter; foxtail algae and black algae are planted in the deep water area, with the planting rate of 20 clumps per square meter.

[0072] (11) The water from the secondary ecological pond is discharged through overflow from an outlet at a fixed elevation.

[0073] Example 2

[0074] This embodiment provides a phosphorus removal method, using the ecological purification pond provided in Example 1, and the specific phosphorus removal method includes the following steps:

[0075] Intermittent water inflow: phosphorus-contaminated water intermittently enters the primary ecological pond through the water inlet, and mixes with the return water introduced by the water lifting and aeration device. The water treated in the primary ecological pond is further filtered and purified through the infiltration island, and then enters the water level regulating well through the connecting pipe, and enters the secondary ecological pond after being regulated by the water level regulating well. The intermittent water inflow: 3 times a day, 1 hour each time.

[0076] Intermittent return: The return pump intermittently leads the water from the secondary ecological pond back to the primary ecological pond, and aerates the water through the water-lifting aeration nozzle, so that the incoming water and the return water are mixed. The frequency of the intermittent return and the intermittent water inflow is synchronized: 3 times a day, each time for 1 hour, and the return flow rate is twice the inflow flow rate.

[0077] Outlet: The water purified by the secondary ecological pond is finally discharged from the outlet.

[0078] The water level difference between the primary ecological pond and the secondary ecological pond and the duration of the water level difference are regulated by intermittent water inflow, intermittent backflow and water level regulating wells. In addition, during the treatment of phosphorus-containing wastewater, the lowest water levels of the primary ecological pond and the secondary ecological pond are both lower than the elevation of the shallow top of the slope.

[0079] Other operating parameters involved in this embodiment: the total phosphorus concentration of the influent (i.e., phosphorus-contaminated water) is 0.3 mg / L; the hydraulic load is 0.1 m 3 / (m 2 ·d). The amount of water to be treated is 0.6m 3 / d; the total area of ​​the ecological purification pond is 6m 2 , height 1.5m, total volume 9.0m 3 Among them, the area of ​​the first-level ecological pond is 3m 2 The area of ​​the secondary ecological pond is 3m 2 The intermittent operation cycle is 3 times a day, 1 hour each time.

[0080] Comparative Example 1

[0081] The specific ecological purification pond provided in Example 1 was used to treat phosphorus-contaminated water. The specific operation was the same as that in Example 2 except that the water level was not adjusted by the water level well. The parameters such as the total phosphorus concentration of the influent, hydraulic load, water volume, total area of ​​the ecological purification pond, intermittent operation cycle, intermittent water inflow and intermittent return time were the same. The treatment effect is shown in the table below.

[0082] Comparative Example 2

[0083] Except that no water lifting aeration nozzle is provided, the specific ecological purification pond provided in Example 1 is used to treat phosphorus-contaminated water. Except that no aeration and mixing is performed, the parameters such as the total phosphorus concentration of the influent, the hydraulic load, the treated water volume, the total area of ​​the ecological purification pond, and the intermittent water inflow are the same as those in Example 2. The treatment effect is shown in the table below.

[0084] Comparative Example 3

[0085] Except for changing the slope to the on-site loam, the specific ecological purification pond provided in Example 1 was used to treat phosphorus-contaminated water, and the specific operation and parameters such as the total phosphorus concentration of the influent, hydraulic load, treated water volume, the total area of ​​the ecological purification pond, the intermittent operation cycle, the intermittent water inflow and the intermittent return time were the same as those in Example 2. The treatment effect is shown in the table below.

[0086] Comparative Example 4

[0087] Except that the water-lifting aeration nozzle is not set and the slope is changed to the on-site loam, the specific ecological purification pond provided in Example 1 is used to treat phosphorus-contaminated water. Except that aeration is not performed and the water level difference is not adjusted, the parameters such as the total phosphorus concentration of the influent, the hydraulic load, the treated water volume, the total area of ​​the ecological purification pond, and the intermittent water inflow are the same as those in Example 2. The treatment effect is shown in the table below.

[0088] Comparative Example 5

[0089] Except that no water-lifting aeration nozzle is set, the slope is changed to on-site loam, and no plants are planted, the specific ecological purification pond provided in Example 1 is used for phosphorus-contaminated water treatment. The specific operation is not aerated, the water level difference is not adjusted, and there is no intermittent reflux. The parameters such as the total phosphorus concentration of the influent, the hydraulic load, the treated water volume, the total area of ​​the ecological purification pond, and the intermittent water inflow time are the same as those in Example 2. According to the quicklime dosage of 150 grams / ton of water, the quicklime is diluted and added by the dilution method, and the diluted quicklime is evenly sprinkled on the phosphorus-contaminated water body in the ecological purification pond, and manually stirred for uniformity. The treatment effect is shown in the following table.

[0090] Test Case

[0091] The phosphorus removal rate of phosphorus-contaminated water was tested by the methods in Example 2 and Comparative Examples 1-4. In the following table, TP 进水TP is the total phosphorus concentration in the phosphorus-contaminated water, that is, the total phosphorus concentration in the influent; 出水 is the effluent total phosphorus concentration.

[0092] <![CDATA[TP 进水 (mg / L)]]> <![CDATA[TP 出水 (mg / L)]]> Phosphorus removal rate (%) Experimental Example 2 0.3 0.05 83.3 Comparative Example 1 0.3 0.07 76.7 Comparative Example 2 0.3 0.15 50.0 Comparative Example 3 0.3 0.22 26.7 Comparative Example 4 0.3 0.20 33.3 Comparative Example 5 0.3 0.08 73.3

[0093] It can be seen from the above table that the ecological purification pond provided by the above embodiment can reduce the total phosphorus concentration of the effluent from 0.3 mg / L to about 0.05 mg / L, and the removal rate is as high as 83.3%. In contrast, the phosphorus removal rate of Comparative Example 1, which does not adjust the water level change by the water level well, is reduced to 76.7%; the phosphorus removal rate of Comparative Example 2, which does not perform aeration, is reduced to 50.0%. Among them, the reason why Comparative Example 2 is worse than Comparative Example 1 is that if aeration is not performed, it is not conducive to the entry of carbon dioxide into the water to react with calcium ions, and only the water level change is easy to form a water calcium film on the water surface, thereby inhibiting the precipitation of phosphates, so that the phosphorus removal effect is greatly reduced. It can be seen that the slope and pond bottom mixed with quicklime and on-site loam combined with water level changes and aeration can greatly improve the phosphorus removal effect. Compared with Comparative Example 5, which directly adds chemical reagents for phosphorus removal, the phosphorus removal effect is better. In addition, compared with traditional ecological ponds (Comparison Examples 3 and 4), the phosphorus removal efficiency is significantly improved, achieving the purpose of slow-release and long-term deep phosphorus removal. The water after phosphorus removal is upgraded from Class IV surface water river to Class III surface water lake reservoir.

[0094] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An ecological purification pond, characterized in that: include: The purification pond module includes a primary ecological pond and a secondary ecological pond. The primary ecological pond and the secondary ecological pond are separated from each other and connected through a connecting pipe. The slopes and bottoms of the primary ecological pond and the secondary ecological pond are backfilled with a mixture of quicklime and on-site loam. A return well and a water level regulating well are provided between the first-level ecological pond and the second-level ecological pond to regulate the water levels in the first-level ecological pond and the second-level ecological pond. The first-level ecological pond is provided with a water-lifting aeration nozzle connected to the return well; The weight ratio of the quicklime on the slope to the on-site loam is (1-3): (9-7), and the weight ratio of the quicklime on the bottom of the pond to the on-site loam is (0.5-1): (9.5-9).

2. The ecological purification pond according to claim 1, characterized in that: The reflow well and the water level regulating well are used to regulate the periodic rise and fall of the water levels in the primary ecological pond and the secondary ecological pond.

3. The ecological purification pond according to claim 2, characterized in that: A percolation island is provided in the first-level ecological pond and is connected to the water level regulating well through a connecting pipe.

4. The ecological purification pond according to claim 1, characterized in that: The shallow water area of ​​the ecological purification pond is planted with emergent plants, and the deep water area is planted with submerged plants.

5. The ecological purification pond according to claim 1, characterized in that: The secondary ecological pond is additionally provided with a water-lifting aerator.

6. The ecological purification pond according to any one of claims 1 to 5, characterized in that: The ecological purification pond comprises a plurality of purification pond modules arranged in parallel.

7. The ecological purification pond according to claim 6, characterized in that: The primary ecological pond and the secondary ecological pond are arranged independently or in conjunction with each other.

8. The ecological purification pond according to claim 6, characterized in that: The first-level ecological pond is provided with a water inlet, and the second-level ecological pond is provided with a water outlet.

9. The ecological purification pond according to claim 6, characterized in that: The primary ecological pond and the secondary ecological pond are separated by an impermeable dam, and an overflow port is arranged on the dam.

10. The ecological purification pond according to claim 3, characterized in that: The filler of the infiltration island is calcareous gravel.

11. The ecological purification pond according to claim 3, characterized in that: A water-collecting steel cage is arranged in the infiltration island.

12. The ecological purification pond according to claim 9, characterized in that: The number of the infiltration islands, water level regulating wells and overflow ports is equal, which is 1-3; the infiltration islands are evenly distributed in the area close to one side of the partition in the first-level ecological pond.

13. The ecological purification pond according to claim 6, characterized in that: A reflux pump is arranged in the reflux well, and the reflux pump is connected to the water-lifting aeration nozzle through a reflux pipe arranged in the primary ecological pond.

14. The ecological purification pond according to claim 6, characterized in that: A water level regulating pipe and a water outlet control valve are arranged in the water level regulating well.

15. A method for removing phosphorus from an ecological purification pond as claimed in any one of claims 1 to 14, characterized in that: The following steps are involved: Intermittent water inflow: phosphorus-contaminated water is intermittently introduced into the primary ecological pond, mixed with the return water introduced by the water lifting and aeration device, and then treated in the primary ecological pond before entering the secondary ecological pond for treatment; Intermittent reflow: The water in the reflow well is intermittently led back to the primary ecological pond through the water lifting aeration device; Outlet: The water discharged after being purified in the secondary ecological pond; The water level difference between the primary ecological pond and the secondary ecological pond and the duration of the water level difference are regulated by intermittent water inflow, intermittent backflow and water level regulating wells. In addition, during the treatment of phosphorus-contaminated water, the lowest water levels of the primary ecological pond and the secondary ecological pond are both lower than the elevation of the shallow top of the slope.

16. The method for removing phosphorus from an ecological purification pond according to claim 15, characterized in that: The phosphorus-contaminated water will be filtered, adsorbed and purified through the infiltration island before entering the secondary ecological pond from the primary ecological pond, and then enter the water level regulating well through the connecting pipe, and then enter the secondary ecological pond after being regulated by the water level regulating well.

17. The method for removing phosphorus from an ecological purification pond according to claim 15, characterized in that: The intermittent water intake: 3-6 times a day, 1-0.5 hours each time, The intermittent reflux: 3-6 times a day, 1-0.5 hours each time, The intermittent water inflow is synchronized with the intermittent backflow frequency, and the backflow flow is 1-3 times the inflow flow. The surface hydraulic load of the ecological purification pond is 0.1 m 3 / (m 2 •d)-0.2m 3 / (m 2 •d), The water level difference between the primary ecological pond and the secondary ecological pond is 1.0m-1.5m.

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