Treatment device for river and lake water

Abstract

The utility model provides a river and lake water treatment device. The river and lake water treatment device comprises an electric flocculation unit and an ecological floating island unit, wherein the electric flocculation unit is provided with a shell, the shell is provided with a reaction cavity, the reaction cavity is provided with a to-be-treated water inlet, and a first polar plate and a second polar plate are alternately arranged in the reaction cavity; the ecological floating island unit is located above the electric flocculation unit, the ecological floating island comprises a gel substrate layer, a nutrient soil layer and a vegetation layer which are sequentially stacked, and the gel substrate layer is close to the electric flocculation unit. The treatment device can more efficiently remove phosphorus pollutants in river and lake water bodies, and has excellent economic benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a treatment device for river and lake water bodies. Background Art

[0002] Phosphorus pollution is one of the main causes of eutrophication and blue algae outbreaks in rivers and lakes. In the existing technology, phosphorus removal from rivers and lakes is mainly achieved by adding chemical agents to rivers and lakes, using biological or ecological methods, etc. Among them, although adding chemical agents to rivers and lakes can quickly remove phosphorus, there are high operation and maintenance costs and the risk of secondary pollution; using biological or ecological methods, although the cost is low and there is no risk of secondary pollution, the efficiency is low and the area occupied is large.

[0003] In order to overcome the above-mentioned defects, electrocoagulation phosphorus removal technology came into being. The existing technology usually combines electrocoagulation technology with ecological floating islands to remove pollutants in river and lake water bodies. However, traditional ecological floating islands mostly use polymer materials (such as plastics, etc.) as floating island carriers, and can only confine plants to specific areas through carriers such as flower pots. Traditional ecological floating islands can only allow plants to float on the water surface, and the water purification effect is poor. The use of flower pots limits the contact between aquatic plants and the water surface, and polymer materials are prone to cause secondary pollution to the water to be treated. Utility Model Content

[0004] The utility model provides a treatment device for river and lake water bodies, which can more efficiently remove phosphorus pollutants in river and lake water bodies and has excellent economic benefits.

[0005] The utility model provides a device for treating river and lake water bodies, which includes an electric flocculation unit and an ecological floating island unit;

[0006] The electro-flocculation unit has a shell, the shell has a reaction chamber, the reaction chamber has an inlet for a water body to be treated, and the reaction chamber is alternately provided with a first electrode plate and a second electrode plate;

[0007] The ecological floating island unit is located above the electric flocculation unit. The ecological floating island includes a gel matrix layer, a nutrient soil layer and a vegetation layer which are stacked in sequence. The gel matrix layer is close to the electric flocculation unit.

[0008] The treatment device as described above, wherein the root systems of the plants in the vegetation layer extend below the bottom of the gel matrix layer.

[0009] The processing device as described above, wherein the reaction chamber comprises a bottom wall and a side wall perpendicular to the bottom wall, the side wall comprises a first side wall, a second side wall, a third side wall and a fourth side wall connected end to end; the first side wall is arranged opposite to the third side wall, and the second side wall is arranged opposite to the fourth side wall;

[0010] The inlet of the water body to be treated is arranged on the first side wall and / or the third side wall;

[0011] The first electrode plate and the second electrode plate are respectively parallel to the first side wall;

[0012] The first electrode plate is close to the second side wall, and the second electrode plate is close to the fourth side wall.

[0013] In the processing device as described above, the power supply of the electric flocculation unit is a direct current power supply, and the output voltage is a pulse voltage.

[0014] The processing device as described above is characterized in that, in the electric flocculation unit, the output current is 0-30A, the output voltage is 0-36V, and the direction change period of the first electrode plate and the second electrode plate is 12-180s.

[0015] The processing device as described above, wherein the first electrode plate and the second electrode plate are both magnesium-aluminum electrode plates; and / or,

[0016] The minimum distance between adjacent first electrode plates and second electrode plates is 10-15 mm.

[0017] The treatment device as described above, wherein the gel matrix layer is selected from a gel layer, a metal oxide layer or a gel-metal oxide composite layer.

[0018] In the treatment device as described above, the thickness of the gel matrix layer is the same as the thickness of the nutrient soil layer.

[0019] The treatment device as described above, wherein, further comprises a lifting unit, wherein the lifting unit is used to control the position of the shell in the water body to be treated.

[0020] The processing device as described above, further comprises a control unit, wherein the control unit is electrically connected to the electric flocculation unit and / or the lifting unit.

[0021] The river and lake water treatment device of the utility model can more efficiently remove phosphorus pollutants in river and lake water bodies by combining a specific ecological floating island unit with an electric flocculation unit, and has excellent economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present utility model or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the structure of a treatment device for river and lake water bodies in some embodiments of the utility model;

[0024] Figure 2 This is a schematic diagram of the inlet distribution of the water body to be treated in some embodiments of the utility model;

[0025] Figure 3 For this utility model Figure 1 Top view of the mid-section.

[0026] Description of reference numerals:

[0027] 3: Lifting unit;

[0028] 4: Control unit;

[0029] 11: Shell;

[0030] 13: Inlet of water to be treated;

[0031] 14: first electrode plate;

[0032] 15: second electrode plate;

[0033] 16: DC power supply;

[0034] 17: Photovoltaic power generation unit;

[0035] 21: gel matrix layer;

[0036] 22: nutrient soil layer;

[0037] 23: vegetation layer;

[0038] 111: first side wall;

[0039] 112: second side wall;

[0040] 113: third side wall;

[0041] 114: Fourth side wall. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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] Figure 1 This is a schematic diagram of the structure of a treatment device for river and lake water bodies in some embodiments of the utility model; Figure 2 This is a schematic diagram of the inlet distribution of the water body to be treated in some embodiments of the utility model. Figure 1 and Figure 2 As shown, the first aspect of the utility model provides a river and lake water treatment device, including an electric flocculation unit and an ecological floating island unit;

[0044] The electro-flocculation unit has a shell 11, the shell 11 has a reaction chamber, the reaction chamber has an inlet 13 for a water body to be treated, and the first electrode plates 14 and the second electrode plates 15 are alternately arranged in the reaction chamber;

[0045] The ecological floating island unit is located above the electric flocculation unit. The ecological floating island includes a gel matrix layer 21, a nutrient soil layer 22 and a vegetation layer 23 which are stacked in sequence, and the gel matrix layer 21 is close to the electric flocculation unit.

[0046] The present invention does not specifically limit the water body to be treated. In some embodiments, the water body to be treated can be a river or lake water body containing phosphorus pollutants and nitrogen pollutants commonly used in the art. For example, the concentration of TP (total phosphorus content) in the water body to be treated is 0.2-5.0 mg / L, and the concentration of NH 3 -N (nitrogen content) concentration is 2.1~15.0 mg / L.

[0047] It can be understood that the housing 11 of the present invention includes a bottom wall and a side wall perpendicular to the bottom wall. The present invention does not specifically limit the material of the housing 11. In some embodiments, the housing 11 can be made of an anti-corrosion material. For example, the housing 11 can be made of carbon steel (the bottom wall and the side wall can be made of carbon steel).

[0048] The river and lake water treatment device of the utility model can be set in the river and lake water body, and can also be set on the shore. The utility model does not limit the setting position of the inlet 13 of the water body to be treated, as long as the water body to be treated can enter the shell 11. Exemplarily, the inlet 13 of the water body to be treated can be set on the side wall of the shell 11, and can also be set on the bottom wall of the shell 11. The utility model also does not limit the shape and number of the inlet 13 of the water body to be treated. The inlet 13 of the water body to be treated can be one or more. When there is one inlet 13 of the water body to be treated, the river and lake water treatment device can be set on the shore, and the water body to be treated enters the shell 11 through the inlet 13 of the water body to be treated; Figure 2 As shown, the inlet 13 for the water body to be treated can be evenly distributed on the side wall or the bottom wall of the reaction chamber (the side wall or the bottom wall of the shell 11 is made by a hollowing process), and the treatment device for river and lake water can be set in the river and lake water body, so that the water body to be treated can enter the shell 11 through multiple inlets 13 for water body to be treated.

[0049] The reaction chamber of the utility model may have a purified water outlet, which may be one or more. In some embodiments, when the treatment device for river and lake water is placed in the river and lake water, the water to be treated enters the shell 11 through the water to be treated inlet 13, and the purified water formed after being purified in the shell 11 can be output through the purified water outlet for reuse, or can be released into the water to be treated through the top of the shell 11, thereby achieving in-situ purification of the river and lake water.

[0050] The reaction chamber of the utility model is alternately provided with a first electrode plate 14 and a second electrode plate 15 (anode plate and cathode plate). In the reaction chamber, the first electrode plate 14 and the second electrode plate 15 will electrolyze to produce electrolytic ions (cations), and the electrolytic ions will form flocs with pollutants (such as phosphorus pollutants and nitrogen pollutants) in the water body to be treated, thereby achieving partial removal of phosphorus pollutants and nitrogen pollutants in the water body to be treated.

[0051] It can be understood that the ecological floating island unit is located at or above the liquid surface of the water body to be treated, and the electric flocculation unit is located below the liquid surface of the water body to be treated.

[0052] The ecological floating island unit of the utility model includes a vegetation layer 23, a nutrient soil layer 22 and a gel matrix layer 21 from top to bottom, wherein the gel matrix layer 21 can absorb pollutants (phosphorus pollutants) in the water body to be treated, and / or the gel matrix layer 21 and the H in the water body + After the reaction, it can form flocs with pollutants in the water to be treated, thereby achieving the removal of pollutants in the water to be treated;

[0053] The plants in the vegetation layer 23 are planted in the nutrient soil layer 22. The nutrient soil layer 22 provides a planting carrier and nutrition for the plants in the vegetation layer 23. The roots of the plants in the vegetation layer 23 can absorb pollutants, further improving the purification effect.

[0054] The plants in the vegetation layer 23 of the present invention may be plants commonly used in the art, such as aquatic plants. The aquatic plants may be at least one of yellow iris, calamus and water celery. The present invention does not limit the planting density of the plants in the vegetation layer 23.

[0055] In the treatment device for river and lake water of the utility model, the electrolytic ions ionized by the first electrode plate 14 and the second electrode plate 15 of the electric flocculation unit react with nitrogen pollutants and phosphorus pollutants in the water body to be treated to form flocs, which can not only avoid the risk of secondary pollution caused by the addition of chemical agents, but also have high phosphorus removal efficiency, and the phosphorus pollutant removal rate can reach more than 50%, which can effectively prevent eutrophication of water bodies; and the ecological floating island can not only further improve the purification effect of the water body to be treated, for example, it can make the phosphorus removal efficiency reach more than 70%, but also will not introduce polymer materials, which can avoid secondary pollution of the water body to be treated. Compared with the existing river and lake water treatment device, the phosphorus removal efficiency of the river and lake water treatment device of the utility model can be improved by more than 30%, and the phosphorus removal effect is stable, which can make the total phosphorus content in the water body to be treated stable below 0.1mg / L (river surface water Class II standard, lake surface water Class IV standard), effectively preventing eutrophication of the water body to be treated.

[0056] Furthermore, the root systems of the plants in the vegetation layer 23 extend below the bottom of the gel matrix layer 21 .

[0057] It can be understood that the roots of the plants in the vegetation layer 23 pass through the nutrient soil layer 22 and the gel matrix layer 21 in sequence, and extend to a position below the bottom of the gel matrix layer 21 (located at the top of the electro-flocculation unit).

[0058] When the root system of the plant extends below the bottom of the gel matrix layer 21, the root system of the plant can not only absorb the pollutants in the gel matrix layer 21, realize the in-situ regeneration of the gel matrix layer 21, and extend the service life of the gel matrix layer 21, which can overcome the defects of traditional pollutant adsorbents that are easily saturated and difficult to regenerate; but the root system of the plant can also further absorb the pollutants in the water body to be treated, and further purify the water body to be treated.

[0059] Figure 3 For this utility model Figure 1 The top view of the mid-section. Figure 3As shown, in some embodiments of the present invention, the reaction chamber includes a bottom wall and a side wall perpendicular to the bottom wall, and the side wall includes a first side wall 111, a second side wall 112, a third side wall 113 and a fourth side wall 114 connected end to end; the first side wall 111 and the third side wall 113 are arranged opposite to each other, and the second side wall 112 and the fourth side wall 114 are arranged opposite to each other;

[0060] The inlet 13 of the water body to be treated is arranged on the first side wall 111 and / or the third side wall 113;

[0061] The first electrode plate 14 and the second electrode plate 15 are respectively parallel to the first side wall 111;

[0062] The first electrode plate 14 is close to the second side wall 112 , and the second electrode plate 15 is close to the fourth side wall 114 .

[0063] It can be understood that the side wall of the reaction chamber is formed by connecting the first side wall 111, the second side wall 112, the third side wall 113 and the fourth side wall 114 end to end. The inlet 13 of the water body to be treated can be set only on the first side wall 111, can also be set only on the third side wall 113, and can also be set on the first side wall 111 and the third side wall 113 at the same time.

[0064] The first electrode plate 14 is parallel to the first side wall 111 and is arranged close to the second side wall 112. The second electrode plate 15 is parallel to the first side wall 111 and is arranged close to the fourth side wall 114. A back-and-forth flow channel can be formed, which helps the water body to be treated to flow in a forward and backward folded manner in the shell 11, enhances the flushing effect on the first electrode plate 14 and the second electrode plate 15, and delays the passivation of the first electrode plate 14 and the second electrode plate 15; it can avoid short-flow of the water body to be treated; increase the contact opportunity between the water body to be treated and the electrolytic ions, and increase the reaction rate. For example, the reaction rate can be increased by more than 30%. It can also make the formed flocs fully contact with the bubbles generated by the flotation unit, which can avoid floc sedimentation and improve the recovery efficiency of phosphorus resources compared with the traditional up and down baffle process.

[0065] In some embodiments of the utility model, the power supply of the electric flocculation unit is a DC power supply 16, and the output voltage is a pulse voltage. When the output voltage is a pulse voltage, the first electrode plate and the second electrode plate can be periodically changed, that is, the first electrode plate is periodically changed to the second electrode plate, and the second electrode plate is changed to the first electrode plate, which can greatly slow down the passivation speed of the conductive electrode plate, and can extend the life of the conductive electrode plate by more than 30% compared with the conventional power supply method.

[0066] In some embodiments, the DC power source 16 may be powered by a photovoltaic power generation unit 17 .

[0067] Furthermore, the output current is 0-30A, the output voltage is 0-36V, and the direction change period between the first electrode plate and the second electrode plate is 12 to 180s.

[0068] The direction change period of the first electrode plate and the second electrode plate refers to how often the first electrode plate and the second electrode plate change direction. In a specific embodiment, the electrode direction change period is 60s.

[0069] The utility model does not specifically limit the first electrode plate 14 and the second electrode plate 15, and electrode plates commonly used in the art can be used. For example, it can be an electrode plate made of aluminum or carbon material, or it can be an electrode plate made of ruthenium or lanthanum material. In some embodiments of the utility model, the first electrode plate 14 and the second electrode plate 15 are both magnesium-aluminum electrode plates. That is, the first electrode plate 14 and the second electrode plate 15 are both made of magnesium-aluminum alloy.

[0070] When the first electrode plate 14 and the second electrode plate 15 are both magnesium-aluminum electrodes, the first electrode plate 14 and the second electrode plate 15 will produce Mg by electrolysis. 2+ (As shown in Formula 1), Mg 2+ Will react with NH 4 + and PO 4 3- Reaction to form struvite MgNH 4 PO 4 6H 2 O (as shown in Formula 2), or Mg 2+ Will react with PO in the water to be treated 4 3- Reaction to form Mg 3 (PO 4 ) 2 (As shown in Formula 3), MgNH 4 PO 4 6H 2 O and Mg 3 (PO 4 ) 2 They are difficult to dissolve in water, thus achieving the removal of phosphorus pollutants and nitrogen pollutants in the water to be treated.

[0071] Mg-2e - = Mg 2+ Formula 1

[0072] Mg 2+ + NH 4 + + PO 4 3- + 6H 2 O=MgNH 4 PO 4 6H2 O↓ Formula 2

[0073] 3Mg 2+ +2PO 4 3- = Mg 3 (PO 4 ) 2 ↓ Formula 3

[0074] Magnesium-aluminum electrode plates can also slow down the passivation rate and have an excellent lifespan. Compared with electrode plates made of aluminum and carbon materials, they can extend their service life by more than 20%. Magnesium-aluminum electrode plates also have a lower manufacturing cost. Compared with plates made of ruthenium and lanthanum materials, they can reduce manufacturing costs by more than 50%.

[0075] Compared with one of the first electrode plate 14 or the second electrode plate 15 being a magnesium-aluminum electrode plate, the first electrode plate 14 and the second electrode plate 15 being both magnesium-aluminum electrode plates can enable the electrode plates to be periodically reversed, and after the electrode plates are reversed, it can still be ensured that the anode electrolyzes magnesium-aluminum ions, thereby improving the removal efficiency of phosphorus-containing pollutants; and this periodic reversal design can greatly delay electrode passivation.

[0076] The present invention does not limit the spacing between the first electrode plate 14 and the second electrode plate 15, and can be adjusted according to actual needs. In some embodiments of the present invention, the minimum distance between adjacent first electrode plates 14 and second electrode plates 15 is 10-15 mm.

[0077] The minimum distance between adjacent first electrode plates 14 and second electrode plates 15 refers to the vertical distance between adjacent first electrode plates 14 and second electrode plates 15. When the minimum distance between adjacent first electrode plates 14 and second electrode plates 15 is within the above range, the electrolytic ions can be fully contacted with the phosphorus pollutants and nitrogen pollutants in the water body, thereby increasing the reaction rate between the pollutants and the electrolytic ions.

[0078] The gel matrix layer 21 of the present invention can be a gel matrix layer 21 commonly used in the art. In some embodiments of the present invention, the gel matrix layer 21 is selected from a gel layer, a metal oxide layer or a gel-metal oxide composite layer.

[0079] The gel in the gel layer can be CaSiO 3 MgSiO 3 and FeSiO 3 The gel has a large specific surface area and can absorb pollutants in the water to be treated; the metal oxide in the metal oxide layer can be CaO, MgO, Al 2 O 3 and Fe 2 O 3At least one of the metal oxides and H in the water to be treated + After the reaction, it can form flocs with pollutants (as shown in Formula 4-Formula 11); the gel-metal oxide composite layer refers to a composite layer including at least one gel and at least one metal oxide. The utility model does not limit the specific content of each component in the gel-metal oxide composite layer, as long as the effect of removing pollutants can be achieved. The gel in the gel-metal oxide composite layer can absorb pollutants in the water to be treated, and the metal oxide can react with H in the water to be treated. + The phosphate-containing polymer reacts with the pollutants to form flocs, thereby increasing the removal rate of phosphorus pollutants in the water to be treated by more than 20%, and the formed flocs can be further adsorbed in the gel.

[0080] CaO + 2H + = Ca 2+ + H 2 O Formula 4

[0081] 3Ca 2+ +2PO 4 3- = Ca 3 (PO 4 ) 2 ↓ Formula 5

[0082] MgO + 2H + = Mg 2+ + H 2 O Formula 6

[0083] 3Mg 2+ +2PO 4 3- = Mg 3 (PO 4 ) 2 ↓ Formula 7

[0084] Al 2 O 3 + 6H + = 2Al 3+ + 3H 2 O formula 8

[0085] Al 3+ + PO 4 3- = AlPO 4 ↓ Formula 9

[0086] Fe 2 O 3 + 6H + = 2Fe 3+ + 3H2 O Formula 10

[0087] Fe 3+ + PO 4 3- = FePO 4 ↓ Formula 11

[0088] In some embodiments, the sludge may be dried, screened, baked, foamed, and shaped in sequence to obtain the gel matrix layer 21. The sludge may be riverbed sludge or sewage treatment plant sludge. Further, the riverbed sludge may be riverbed dredging sludge, and the sewage treatment plant sludge may be iron-containing sludge in the sewage treatment plant. Specifically, during the baking process, SiO 2 Can be combined with metal oxides (e.g., CaO, MgO, Fe 2 O 3 ) reaction to form a gel (as shown in Formula 12-14).

[0089] CaO + SiO 2 = CaSiO 3 Formula 12

[0090] MgO + SiO 2 = MgSiO 3 Formula 13

[0091] Fe 2 O 3 + SiO 2 = FeSiO 3 Formula 14

[0092] The nutrient soil layer 22 of the utility model can be a nutrient soil layer commonly used in the art. In some embodiments, the riverbed mud can be dried and aerobic fermented in sequence, so that the riverbed mud can be harmless and stabilized, thereby forming the nutrient soil layer 22.

[0093] When sludge is used to prepare the gel matrix layer 21 and the nutrient soil layer 22, the raw materials are easy to obtain, the preparation process is simple, the production cost is lower, and waste can be turned into treasure, thereby improving economic benefits.

[0094] Furthermore, when the thickness of the gel matrix layer 21 is the same as the thickness of the nutrient soil layer 22 , the water body to be treated can be further purified on the basis of saving the gel matrix layer 21 and the nutrient soil layer 22 .

[0095] In some embodiments of the present invention, a lifting unit 3 is further included, and the lifting unit 3 is used to control the position of the housing 11 in the water body to be treated.

[0096] In the utility model, when the river and lake water treatment device is located in the water body to be treated, the position of the shell 11 in the water body to be treated can be controlled by the lifting unit 3, thereby controlling the position of the river and lake water treatment device in the water body to be treated, thereby realizing the removal of pollutants at different depths of the water body to be treated.

[0097] The utility model does not particularly limit the specific structure of the lifting unit 3. In some embodiments, the lifting unit 3 may be an electric lifting arm connected to the housing.

[0098] In some embodiments of the present invention, a control unit 4 is further included, and the control unit 4 is electrically connected to at least one of the electric flocculation unit and the lifting unit 3 .

[0099] Specifically, the control unit 4 may be electrically connected only to the electric flocculation unit, may be electrically connected only to the lifting unit 3 ; and may also be electrically connected to both the electric flocculation unit and the lifting unit 3 at the same time.

[0100] In a specific implementation, the control unit 4 controls the opening degree of the electric flocculation unit and the lifting unit 3 according to the real-time content of pollutants in the water body to be treated.

[0101] In the utility model, the control unit 4 can ensure that the concentration of the electrolytic ions matches the concentration of the pollutants in the water to be treated, and can avoid excessive consumption of the electrode plates due to excessive electrolysis of the electrode plates when the electrolytic ions and the pollutants are effectively flocculated; at the same time, the electrode plate change cycle can be adjusted in combination with the concentration of the pollutants to effectively delay the passivation time of the electrode plates; and according to the concentration of the pollutants in the water to be treated, the water entry depth of the river and lake water treatment device is adjusted to achieve accurate removal of pollutants in the river and lake water bodies.

[0102] The second aspect of the utility model provides a method for treating river and lake water bodies, which is performed using the river and lake water body treatment device of the first aspect.

[0103] The method for treating river and lake water bodies of the utility model uses the river and lake water body treatment device of the first aspect. The method can efficiently remove pollutants in river and lake water bodies and can also realize the recycling of pollutants. It has excellent economic benefits and is suitable for wide promotion and application.

[0104] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0105] The method for treating river and lake water in this embodiment adopts Figure 1-3 The river and lake water treatment device shown is carried out, specifically including:

[0106] S1: The water to be treated enters the housing 11 through the water inlet 13 in a direction perpendicular to the first side wall 111, and the Mg produced by electrolysis of the first electrode plate 14 and the second electrode plate 15 2+ It reacts with nitrogen and phosphorus pollutants in the water to be treated to form MgNH 4 PO 4 6H 2 O (struvite) and / or Mg 3 (PO 4 ) 2 Flocs;

[0107] Among them, the concentration of TP in the water to be treated is 2.9 mg / L, NH 3 -N concentration was 7.3 mg / L;

[0108] The first electrode plate and the second electrode plate are magnesium-aluminum electrode plates, and the spacing between the first electrode plate and the second electrode plate is 10 mm. The number of the first electrode plate and the second electrode plate is 15 each;

[0109] The power supply of the electroflocculation unit is a DC power supply 16, and the output voltage is a pulse voltage, wherein the output current is 3.0A and the output voltage is 36V;

[0110] S2: The pollutants in the water at the top of the electroflocculation unit react with the metal oxides in the gel matrix layer 21 to form Ca2+ 3 (PO 4 ) 2 Mg 3 (PO 4 ) 2 、FePO 4 and is adsorbed into the gel;

[0111] The gel matrix layer includes the following components according to mass percentage: CaSiO 3 8%,MgSiO 3 3%,FeSiO 3 3%, SiO 2 45%,Al 2 O 3 15%, CaO 2%, MgO 2%, Fe 2 O 3 4%;

[0112] S3: The roots of the plants in the vegetation layer 23 pass through the nutrient soil layer 22 and the gel matrix layer 21 in sequence, and extend to below the bottom of the gel matrix layer 21. The roots absorb the pollutants in the water body at the top of the electrolytic flocculation unit for plant growth metabolism. At the same time, the roots of the plants can also absorb the pollutants adsorbed in the gel matrix layer 21, thereby realizing the in-situ regeneration of the gel matrix layer 21.

[0113] Purify water after absorption;

[0114] Among them, the plants in the vegetation layer are cannas, with a planting density of 16 plants per square meter;

[0115] The nutrients in the nutrient soil layer include: organic matter 28%, nitrogen 1.2%, phosphorus 1.1%, potassium 1.1%, trace elements (Fe, Mn, Cu, Zn, B, Mo, Cl, etc.) 0.5%, water 37%, and the remaining inorganic components (SiO 2 、Al 2 O 3 etc.) 31.1%;

[0116] The TP concentration of purified water is 0.3 mg / L, NH 3 -N concentration is 0.6 mg / L;

[0117] S4: using online monitoring electrodes to monitor the concentration of pollutants in the water to be treated at different depths, and transmitting the monitoring results to the controller;

[0118] According to the concentration of phosphorus-containing pollutants at different depths in the water body, the water entry depth of the electric lifting arm is adjusted so that the housing 11 is placed in the water body to be treated at the depth with the highest pollution concentration, thereby accurately removing the pollutants in the water body to be treated;

[0119] According to the concentration of pollutants in the water to be treated and combined with the results of machine learning, the switching cycle, output current and output voltage of the DC power supply are adjusted.

[0120] 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. A device for treating river and lake water, characterized in that: Including electroflocculation unit and ecological floating island unit; The electro-flocculation unit has a shell, the shell has a reaction chamber, the reaction chamber has an inlet for a water body to be treated, and the reaction chamber is alternately provided with a first electrode plate and a second electrode plate; The ecological floating island unit is located above the electric flocculation unit. The ecological floating island includes a gel matrix layer, a nutrient soil layer and a vegetation layer which are stacked in sequence. The gel matrix layer is close to the electric flocculation unit.

2. The processing device according to claim 1, characterized in that The root systems of the plants in the vegetation layer extend below the bottom of the gel matrix layer.

3. The processing device according to claim 1 or 2, characterized in that: The reaction chamber comprises a bottom wall and a side wall perpendicular to the bottom wall, wherein the side wall comprises a first side wall, a second side wall, a third side wall and a fourth side wall connected end to end; the first side wall is arranged opposite to the third side wall, and the second side wall is arranged opposite to the fourth side wall; The inlet of the water body to be treated is arranged on the first side wall and / or the third side wall; The first electrode plate and the second electrode plate are respectively parallel to the first side wall; The first electrode plate is close to the second side wall, and the second electrode plate is close to the fourth side wall.

4. The processing device according to claim 1 or 2, characterized in that: The power supply of the electric flocculation unit is a direct current power supply, and the output voltage is a pulse voltage.

5. The processing device according to claim 4, characterized in that In the electric flocculation unit, the output current is 0-30A, the output voltage is 0-36V, and the direction change period of the first electrode plate and the second electrode plate is 12-180s.

6. The processing device according to any one of claims 1, 2 and 5, characterized in that: The first electrode plate and the second electrode plate are both magnesium-aluminum electrode plates; and / or, The minimum distance between adjacent first electrode plates and second electrode plates is 10-15 mm.

7. The processing device according to any one of claims 1, 2 and 5, characterized in that: The gel matrix layer is selected from a gel layer, a metal oxide layer or a gel-metal oxide composite layer.

8. The processing device according to any one of claims 1, 2 and 5, wherein the thickness of the gel matrix layer is the same as the thickness of the nutrient soil layer.

9. The processing device according to any one of claims 1, 2 and 5, characterized in that: It also includes a lifting unit, which is used to control the position of the shell in the water body to be treated.

10. The processing device according to claim 9, characterized in that It also includes a control unit, which is electrically connected to the electric flocculation unit and / or the lifting unit.

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