Ecological filter system

Abstract

The utility model discloses an ecological filter system, which relates to the technical field of polluted water treatment and comprises a column type treatment filter and an aeration device. An inlet for injecting polluted underground water is formed above the column type treatment filter tank, and a water outlet is formed below the column type treatment filter tank; a functional reaction filler layer is arranged in the column type treatment filter tank; the functional reaction filler layer comprises an iron-carbon filler, the iron-carbon filler is an iron-carbon ball formed by mixing scrap iron and biochar, the iron-carbon filler is soaked in a bacterial liquid, and the bacterial liquid is obtained by expanding culture of organic matter degradation denitrifying bacteria; the aeration device is provided with an aeration pipe which is positioned in the functional reaction filler layer. According to the invention, various pollutants can be efficiently and synchronously treated, and a relatively high pollutant removal function is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of polluted water treatment, particularly to an ecological filter system. BACKGROUND

[0002] Due to the behaviors of human beings in the process of agricultural production and breeding, such as overuse of chemical fertilizer, pesticide, antibiotic and unreasonable exploitation and utilization of mineral resources, various pollutants enter and pollute groundwater through rainwater leaching or penetration. In many places, especially in rural areas, the content of nitrate, nitrite and phosphate in groundwater is high, and there is a certain amount of heavy metals and toxic organic matter. These groundwater, without efficient treatment, used for production and drinking of human and livestock, will eventually have a certain toxic effect on human health, especially the toxic effect of heavy metals and organic matter is larger. Therefore, in view of the groundwater pollution, it is urgent to develop a kind of efficient, low-cost and convenient for later operation and management technology to effectively treat it, so as to ensure the safe use of groundwater.

[0003] The ecological filter is a commonly used sewage treatment process, which has the advantages of low construction and operation cost and easy management. The filler has more pores and strong adsorption capacity, and the microbial membrane attached to the surface of the filler can carry out various biochemical reactions, which can block and degrade various pollutants in water, and is suitable for the treatment of contaminated groundwater, especially suitable for use in remote rural areas. It is a kind of potential groundwater pollution treatment technology.

[0004] But limited to the high content of nitrate nitrogen in contaminated groundwater, the difficulty of degrading organic matter, the existence of toxic heavy metals, the specific surface area of traditional filter filler such as gravel is small, the performance of adsorbing pollutants and attaching biological membrane is poor, the number of microorganisms in the treatment system is small, the type is single, there is no effective way of microbial denitrification and organic matter removal, and the toxic effect of heavy metals and other heavy metals further destroys the growth environment of microorganisms, so the traditional filter system is difficult to realize the effect of efficient synchronous removal of various pollutants in groundwater. UTILITY MODEL CONTENT

[0005] The utility model aims at providing an ecological filter system to solve the problems existing in the prior art, which can realize efficient synchronous treatment of various pollutants and has high pollutant removal function.

[0006] In order to achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a kind of ecological filter system, including column type treatment filter tank and aeration device;The column type treatment filter tank upper portion is provided with the import for contaminated groundwater injection, and the lower of the column type treatment filter tank is provided with drain outlet;Functional reaction filler layer is provided in the column type treatment filter tank;The functional reaction filler layer includes iron-carbon filler, the iron-carbon filler is the iron-carbon round ball that iron filings and biochar are mixed, the iron-carbon filler is soaked by bacterial liquid, and the bacterial liquid is obtained by organic matter degradation denitrifying bacteria expansion;The aeration device has aeration pipe, and the aeration pipe is located in the functional reaction filler layer.

[0008] Preferably, the column type treatment filter tank is also provided with gravel filler layer;The gravel filler layer includes interception gravel particle and interception walnut shell composition;In vertical direction, the gravel filler layer is located above the functional reaction filler layer.

[0009] Preferably, the column type treatment filter tank is also provided with activated carbon filter layer;The activated carbon filter layer has activated carbon particles;In vertical direction, the activated carbon filter layer is located below the functional reaction filler layer.

[0010] Preferably, the column type treatment filter tank is also provided with gravel drainage layer;The gravel drainage layer has drainage gravel particle;In vertical direction, the gravel drainage layer is located below the activated carbon filter layer.

[0011] Preferably, it also includes water inlet device;The water inlet device includes adjustment pool, water inlet pipe and water distributor communicated in sequence;The adjustment pool is located above the column type treatment filter tank;The adjustment pool is used for containing contaminated groundwater;The water distributor is located above the import of the column type treatment filter tank.

[0012] Preferably, the aeration device includes the aeration pipe, air pipe and gas pump;Both ends of the aeration pipe are blocked, and the aeration pipe is provided with aeration hole on the side wall;One end of the air pipe is connected and communicated with the gas output port of the gas pump, and the other end of the air pipe is located in the aeration pipe.

[0013] Preferably, the volume ratio of the gravel filler layer, the functional reaction filler layer, the activated carbon filter layer and the gravel drainage layer is 1:4~5:1~2:1.

[0014] Preferably, the aeration device also includes solar power supply system;The solar power supply system includes time relay, battery and solar panel;The battery is connected with the gas pump, and the time relay is arranged in the control circuit of the gas pump;The solar panel is connected with the battery.

[0015] Preferably, the functional reaction filler layer further comprises waste plant matter, the waste plant matter comprising waste walnut shells mixed with the iron-carbon filler; the volume ratio of the waste walnut shells to the iron-carbon filler being 1:5-6.

[0016] Preferably, the trapped gravel particles and the trapped walnut shells have a particle size of 10-20 mm; the iron-carbon spherical particles have a particle size of 5-10 mm; the activated carbon particles have a particle size of 10-15 mm; and the drainage gravel particles have a particle size of 15-25 mm.

[0017] The present utility model has the following technical effects compared with the prior art:

[0018] The ecological filter system provided by the present utility model realizes treatment of underground polluted water through the columnar treatment filter, the iron-carbon filler filled in the columnar treatment filter, and the cooperation of the aeration device; under the micro-electrolysis effect of the iron-carbon filler, the pollutants in the water undergo oxidation-reduction reaction and flocculation precipitation reaction; the aeration device fills oxygen into the water, which on the one hand maintains the micro-electrolysis reaction of the iron-carbon filler and on the other hand provides oxygen for subsequent biological treatment; after certain reaction and precipitation treatment, the system can realize efficient synchronous treatment of multiple pollutants and has high pollutant removal function.

[0019] Further, the trapped gravel particles and the trapped walnut shells can realize physical filtration of underground polluted water, intercept larger particles of suspended matter, silt and other substances in the water, and play a preliminary filtering role; the walnut shells have rich pore structure and large specific surface area and have certain adsorption capacity for pollutants such as organic matter and heavy metal ions in the water; the gravel filler layer provides a good attachment surface for the growth of microorganisms and is conducive to the formation of a biofilm; the microorganisms in the water grow and reproduce on the surface of the gravel and the walnut shells, forming a complex biological community, which removes organic matter and part of nutrients in the water through biodegradation.

[0020] Further, there may still be some organic matter, heavy metal ions, and substances with different colors and odors that have not been completely removed in the water after treatment by the iron-carbon filler; the activated carbon has highly developed pore structure and large specific surface area, which can effectively adsorb these residual pollutants and improve water quality; the activated carbon can adsorb small-molecule organic matter and inorganic matter in the water, such as some low-molecular-weight organic acids, aldehydes, ketones, and part of the dissolved heavy metal ions; and the activated carbon filter layer can prevent fine particles or dissolved substances in the iron-carbon filler from penetrating downward and prevent them from entering the subsequent pipeline and causing blockage.

[0021] Further, the gravel drainage layer can ensure that the treated groundwater can be smoothly discharged from the system, and the high porosity and good water permeability of the gravel enable the water to flow quickly, avoiding water accumulation and blockage; this is crucial for maintaining the smooth flow of the entire ecological treatment system, ensuring that the treatment process can continue stably; and the gravel drainage layer can also provide certain structural support for the entire ecological treatment system, which can bear the weight of the upper filler, prevent the filler layer from collapsing or deforming, and maintain the stability and integrity of the system.

[0022] Further, the adjusting tank can accommodate a certain amount of underground contaminated water to balance the water quality; the water distributor can uniformly distribute the contaminated water in the adjusting tank to the columnar treatment filter tank; so that the contaminated water can be fully treated, improving the treatment effect.

[0023] Further, the aeration device adopts an air pump and is realized through an air pipe and an aeration pipe, which has a simple structure and is convenient to manufacture.

[0024] Further, the volume ratio of each layer in the columnar treatment filter tank is 1:4-5:1-2:1, which can reasonably allocate the treatment function, optimize the water flow and treatment effect, and facilitate maintenance and management, thereby realizing efficient treatment of underground contaminated water.

[0025] Further, the energy is cleaned by the solar panel, and the energy is fully utilized to reduce energy consumption and realize long-term and stable treatment of underground contaminated water.

[0026] Further, the waste walnut shell has a rich pore structure and a large specific surface area, and can adsorb organic matter, heavy metal ions and other pollutants in the contaminated water; in the functional reaction filler layer, the waste walnut shell can synergistically act with other fillers to enhance the removal effect of pollutants; applying the waste walnut shell to the functional reaction filler layer of the columnar treatment filter tank can realize recycling of waste and reduce environmental pollution; using the waste walnut shell as part of the functional reaction filler layer can reduce the construction and operation cost of the filter tank.

[0027] Further, the fillers with different particle sizes are used in each layer of the columnar treatment filter tank, which can fully exert the function of each layer, improve the efficiency and effect of contaminated water treatment, and ensure the stability and reliability of the filter tank. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 The overall structure schematic diagram of the ecological filter system is provided.

[0030] In the drawing,

[0031] 100-ecological filter system;

[0032] 10-water inlet device; 11-adjusting tank; 12-water inlet pipe; 13-water distributor;

[0033] 20-column type treatment filter; 21-gravel filler layer; 22-functional reaction filler layer; 23-activated carbon filter layer; 24-gravel drainage layer; 25-water outlet pipe; 26-electric valve;

[0034] 30-aeration device; 31-aeration pipe; 32-air pipe; 33-pipe cover; 34-air pump; 35-time relay; 36-battery; 37-solar panel. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0036] The present application provides an ecological filter system to solve the problems in the prior art, which can realize efficient and synchronous treatment of multiple pollutants and has high pollutant removal function.

[0037] In order to make the above purposes, features and advantages of the present application more apparent, specific embodiments and drawings will be described in detail below.

[0038] Embodiment one

[0039] The present application provides an ecological filter system 100, which mainly but not limitedly removes nitrogen, phosphorus, heavy metals and organic matter in underground water synchronously and efficiently, such as Figure 1 As shown in the drawing, the ecological filter system 100 comprises a column type treatment filter 20 and an aeration device 30; the column type treatment filter 20 is provided with an inlet for injecting contaminated underground water above, and is provided with a drainage port below; the column type treatment filter 20 is provided with a functional reaction filler layer 22; the functional reaction filler layer 22 comprises iron-carbon filler, which is iron-carbon spherical balls mixed by iron filings and biochar, and the iron-carbon filler is soaked by bacteria liquid, which is obtained by expanding organic matter degrading denitrifying bacteria; the aeration device 30 has an aeration pipe 31, which is located in the functional reaction filler layer 22.

[0040] By setting the column type treatment filter tank 20, the iron-carbon filler is filled in the column type treatment filter tank 20, and the aeration device 30 is matched to realize the treatment of the underground polluted water; under the micro-electrolysis effect of the iron-carbon filler, the pollutants in the water undergo oxidation-reduction reaction and flocculation precipitation reaction; the aeration device 30 fills oxygen into the water, which on the one hand maintains the micro-electrolysis reaction of the iron-carbon filler, and on the other hand provides oxygen for the subsequent biological treatment; after a certain reaction and precipitation treatment, it can realize the efficient synchronous treatment of multiple pollutants, and has high pollutant removal function.

[0041] Specifically, the ecological filter tank system 100 of the embodiment is easy to construct and operate, low in cost, and convenient to manage and maintain, and is especially suitable for efficient purification of polluted underground water in remote rural areas.

[0042] Among them, for nitrogen: the iron-carbon filler forms a micro-battery in water, iron is the anode and carbon is the cathode, the anode iron corrodes to produce ferrous ions, which have reducing properties and can reduce nitrate to nitrogen, thereby removing nitrogen from wastewater; the aeration device 30 can adjust the dissolved oxygen content in the wastewater, and appropriate aeration can create an environment of alternating oxygen and anoxia, which is conducive to the growth of denitrifying bacteria and the performance of denitrification; in the aerobic stage, organic matter is oxidized and decomposed, consuming a large amount of oxygen to create conditions for the subsequent anoxic stage; in the anoxic stage, denitrifying bacteria use organic matter as a carbon source to reduce nitrate to nitrogen.

[0043] Among them, for phosphorus: iron ions in the iron-carbon filler can combine with phosphate ions in water to form insoluble ferric phosphate precipitate, thereby removing phosphorus from wastewater; biochar has a large specific surface area and rich pore structure, which can adsorb phosphorus in wastewater; at the same time, iron oxides and hydroxides on the surface of the iron-carbon filler can also fix phosphorus through adsorption, reducing the concentration of phosphorus in the wastewater; aeration can change the chemical properties of the water body, such as increasing the pH value and oxidation-reduction potential; under certain conditions, these changes can promote the combination of phosphorus in water with metal ions to form precipitates, thereby reducing the concentration of phosphorus.

[0044] Among them, for heavy metals: iron in the iron-carbon filler has reducing properties and can reduce some high-valence heavy metal ions to low-valence heavy metal ions, which are more easily removed by precipitation or adsorption; biochar can adsorb heavy metal ions, and iron hydroxide and other precipitates formed by iron ions in the iron-carbon filler in water can co-precipitate with heavy metal ions to promote the removal of heavy metals; aeration can change the oxidation-reduction potential of the water body, affecting the existence form of heavy metals so that they form more stable precipitates; aeration can increase the dissolved oxygen in the water, promoting the metabolic activity of microorganisms, so that some microorganisms can reduce the concentration of heavy metals in the water through adsorption, complexation and biological transformation.

[0045] Wherein, for the organic matter, the iron-carbon filler forms a micro-battery in water, the generated micro-current can stimulate the metabolic activity of microorganisms, promote the degradation of organic matter, at the same time, the micro-electrolysis reaction can also produce strong oxidants such as hydroxyl radicals, which can oxidize and decompose organic matter, and convert it into carbon dioxide, water and inorganic salts and other harmless substances; the biochar has a large specific surface area and a rich pore structure, which can adsorb organic matter in sewage. At the same time, the iron oxide and hydroxide on the surface of the iron-carbon filler can also fix organic matter through adsorption, reducing the concentration of organic matter in the sewage; the aeration device 30 can provide sufficient oxygen for aerobic microorganisms, promoting the oxidation and decomposition of organic matter; aerobic microorganisms can rapidly degrade biodegradable organic matter in water, converting it into carbon dioxide, water and inorganic salts and other harmless substances, and the water flow generated by aeration can improve the flowability of the water body, preventing the accumulation of organic matter in local areas; and the flowing water is conducive to the full contact of microorganisms and organic matter, improving the degradation rate of organic matter.

[0046] Wherein, the column treatment filter tank 20 is also provided with a water inlet device 10:

[0047] In an optional embodiment of the present embodiment, as shown in Figure 1 The water inlet device 10 comprises a regulating tank 11, a water inlet pipe 12 and a water distributor 13 which are sequentially connected; the regulating tank 11 is located above the column treatment filter tank 20; the regulating tank 11 is used to hold contaminated groundwater; and the water distributor 13 is located directly above the inlet of the column treatment filter tank 20. The regulating tank 11 can accommodate a certain amount of contaminated groundwater to balance the water quality; the water distributor 13 can uniformly distribute the contaminated water in the regulating tank 11 into the column treatment filter tank 20; so that the contaminated water can be fully treated, improving the treatment effect.

[0048] Specifically, the regulating tank 11 is arranged at the side of the column treatment filter tank 20, and the bottom of the regulating tank 11 is higher than the column treatment filter tank 20. The contaminated groundwater pumped from the ground into the regulating tank 11 is transported to the water distributor 13 by gravity through the water inlet pipe 12. The water distributor 13 inputs the contaminated groundwater into the column treatment filter tank 20 in the form of spraying or dripping, and the water flow direction is from top to bottom.

[0049] Specifically, the frame body of the column treatment filter tank 20 is made of polyethylene, polypropylene or the like, and has a cylindrical shape or a cuboid shape. The cylindrical shape has a specification of diameter: height = 1:2-6, and the cuboid shape has a specification of length: width: height = 1-2:1:2-6.

[0050] Wherein, the column treatment filter tank 20 is sequentially provided with a gravel filler layer 21, a functional reaction filler layer 22, an activated carbon filter layer 23 and a gravel drainage layer 24 from top to bottom.

[0051] For the gravel filler layer 21:

[0052] In the optional solution of the embodiment, preferably, as shown in Figure 1 The gravel filler layer 21 is further arranged in the columnar treatment filter tank 20 and is composed of trapped gravel particles and trapped walnut shells. In the vertical direction, the gravel filler layer 21 is located above the functional reaction filler layer 22. The trapped gravel particles and the trapped walnut shells can achieve physical filtration of underground contaminated water, intercept larger particles of suspended solids, silt and other substances in the water, and play a preliminary filtering role. The walnut shells have abundant pore structures and large specific surface areas and have a certain adsorption capacity for organic matter, heavy metal ions and other pollutants in water. The gravel filler layer 21 provides a good attachment surface for the growth of microorganisms and is conducive to the formation of a biofilm. Microorganisms in water grow and reproduce on the surface of gravel and walnut shells to form a complex biological community, and organic matter and part of the nutrients in water are removed through biodegradation.

[0053] Specifically, the volume ratio of the trapped gravel particles to the trapped walnut shells is 4-5:1.

[0054] For the functional reaction filler layer 22:

[0055] In the optional solution of the embodiment, preferably, the functional reaction filler layer 22 further includes waste plant matter, the waste plant matter includes waste walnut shells, and the waste walnut shells are mixed with the iron-carbon filler. The volume ratio of the waste walnut shells to the iron-carbon filler is 1:5-6. The waste walnut shells have abundant pore structures and large specific surface areas and can adsorb organic matter, heavy metal ions and other pollutants in contaminated water. In the functional reaction filler layer 22, the waste walnut shells can synergize with other fillers to enhance the removal effect of pollutants. The application of the waste walnut shells to the functional reaction filler layer 22 of the columnar treatment filter tank 20 can realize the recycling of waste and reduce environmental pollution. The use of the waste walnut shells as part of the functional reaction filler layer 22 can reduce the construction and operation cost of the filter tank.

[0056] Specifically, the iron-carbon filler is prepared by mixing iron filings and biochar in a mass ratio of 1:1 under the action of sol, and then through a gelation and calcination process to form iron-carbon spheres with a particle size of 5-10 mm.

[0057] For the activated carbon filter layer 23:

[0058] In the optional solution of the embodiment, preferably, as shown in Figure 1As shown, the columnar treatment filter tank 20 is further provided with an activated carbon filter layer 23; the activated carbon filter layer 23 has activated carbon particles; in the vertical direction, the activated carbon filter layer 23 is below the functional reaction filler layer 22. There may still be some organic matter, heavy metal ions, and substances with different colors and odors that are not completely removed in the water treated by the iron-carbon filler; the activated carbon has highly developed pore structure and large specific surface area, which can effectively adsorb these residual pollutants and improve water quality; the activated carbon can adsorb small molecular organic and inorganic substances in water, such as some low molecular weight organic acids, aldehydes, ketones, etc., and part of the dissolved heavy metal ions; and the activated carbon filter layer 23 can prevent the fine particles or dissolved substances in the iron-carbon filler from penetrating downward and prevent them from entering the subsequent pipeline to cause blockage.

[0059] For the gravel drainage layer 24:

[0060] In an optional embodiment of the present embodiment, preferably, as shown in Figure 1 As shown, the columnar treatment filter tank 20 is further provided with a gravel drainage layer 24; the gravel drainage layer 24 has drainage gravel particles; in the vertical direction, the gravel drainage layer 24 is below the activated carbon filter layer 23. The gravel drainage layer 24 can ensure that the treated groundwater can smoothly flow out of the system; the high porosity and good water permeability of the gravel make the water flow quickly, avoiding water accumulation and blockage; this is crucial for maintaining the smooth flow of the entire ecological treatment system, ensuring that the treatment process can continue stably; and the gravel drainage layer 24 can also provide certain structural support for the entire ecological treatment system, which can bear the weight of the upper filler to prevent the filler layer from collapsing or deforming, maintaining the stability and integrity of the system.

[0061] Regarding other related settings in the columnar treatment filter tank 20:

[0062] In an optional embodiment of the present embodiment, preferably, the volume ratio of the gravel filler layer 21, the functional reaction filler layer 22, the activated carbon filter layer 23, and the gravel drainage layer 24 is 1:4-5:1-2:1. The volume ratio of each layer in the columnar treatment filter tank 20 is 1:4-5:1-2:1, which can reasonably allocate treatment functions, optimize water flow and treatment effect, facilitate maintenance and management, and thus achieve efficient treatment of underground contaminated water.

[0063] In an optional embodiment of the present embodiment, preferably, the particle size of the trapped gravel particles and the trapped walnut shells is 10-20 mm; the particle size of the iron-carbon spherical particles is 5-10 mm; the particle size of the activated carbon particles is 10-15 mm; and the particle size of the drainage gravel particles is 15-25 mm. The use of fillers with different particle sizes in each layer of the columnar treatment filter tank 20 can fully utilize the functions of each layer, improve the efficiency and effect of contaminated water treatment, and at the same time ensure the stability and reliability of the filter tank.

[0064] Specifically, the lower end of the columnar treatment filter 20 is provided with a water outlet pipe 25, and the water outlet pipe 25 is provided with an electric valve 26. The end of the water outlet pipe 25 is opened to form a water outlet.

[0065] Specifically, the electric valve 26 controls the discharge flow of the treated groundwater, and the purified groundwater is discharged from the water outlet pipe 25 for subsequent use.

[0066] Among them, the structure of the aeration device 30 is described as follows:

[0067] In an optional embodiment of the present embodiment, as shown in Figure 1 The aeration device 30 includes an aeration pipe 31, an air pipe 32 and a gas pump 34. Both ends of the aeration pipe 31 are blocked, and the aeration pipe 31 is provided with aeration holes on the side wall. One end of the air pipe 32 is connected and communicated with the gas outlet of the gas pump 34, and the other end of the air pipe 32 is located in the aeration pipe 31. The aeration device 30 uses the gas pump 34 and realizes it through the air pipe 32 and the aeration pipe 31, which has a simple structure and is convenient to manufacture.

[0068] Specifically, the end of the aeration pipe 31 is provided with a pipe cover 33, and the pipe cover 33 is provided with a perforation for the air pipe 32 to pass through. The material of the pipe cover 33 is polyethylene or polypropylene.

[0069] Specifically, the aeration pipe 31 is a perforated pipe, and the material of the perforated pipe is cast iron or the like. The aeration pipe 31 is arranged at the middle position of the columnar treatment filter 20, perpendicular to each filler layer, and the lower end extends to the bottom of the functional reaction filler layer 22.

[0070] Specifically, the aeration holes on the aeration pipe 31 have a diameter of 2mm-4mm, which facilitates the entry of gas into the functional reaction filler layer 22.

[0071] In an optional embodiment of the present embodiment, as shown in Figure 1 The aeration device 30 further includes a solar power supply system. The solar power supply system includes a time relay 35, a storage battery 36 and a solar panel 37. The storage battery 36 is electrically connected with the gas pump 34, and the time relay 35 is arranged in the control circuit of the gas pump 34. The solar panel 37 is electrically connected with the storage battery 36. The solar panel 37 realizes clean energy, fully utilizes energy, reduces energy consumption, and realizes long-term stable treatment of underground contaminated water.

[0072] Specifically, the time relay 35 controls the opening and closing of aeration, and aeration is performed twice within 24 hours, each time for 1-2 hours.

[0073] The gain effects after using the ecological filter system 100 provided by the present embodiment mainly include the following points:

[0074] (1) can synchronously treat groundwater contaminated by nitrate, phosphorus, heavy metals and organic matter, and has high pollutant removal efficiency;

[0075] (2) the building materials and fillers are easy to prepare or obtain and are green and environmentally friendly, the system is convenient to assemble, easy to operate and manage, and conducive to long-term efficient operation, and the filter tank has a long service life;

[0076] (3) small land occupation, low cost, good benefit, suitable for groundwater pollution treatment in rural areas, and can provide a scientific and effective solution for safe use of groundwater resources.

[0077] For the system, the influent is contaminated groundwater, the nitrate content is 12 mg / L, the TN content is 13 mg / L, the TP is 0.5 mg / L, the Cu 2+ content is 1.8 mg / L, the Cr 6+ content is 0.15 mg / L, and the hexachlorobenzene content is 3.0 mg / L. The following four specific application examples are carried out in turn, as follows:

[0078] Specific application example 1

[0079] (1) Contaminated groundwater is pumped into the adjusting tank 11. In a 0.4m long, 0.2m wide and 1.0m high rectangular polyethylene filter tank, a 0.1m thick gravel drainage layer 24 is provided at the bottom, and an activated carbon filter layer 23 is filled thereon, with a filling height of 0.2m and an activated carbon particle size of 10mm; above that, a mixed filler of walnut shell and iron-carbon is filled as a functional reaction layer, with a volume ratio of 1:5 and a filling height of 0.5m; the iron-carbon particle size is 5mm and the walnut shell particle size is 5mm; the functional reaction filler layer 22 is soaked in microbial liquid for 7 days and then filled into the column type treatment tank; above that, a 0.1m thick walnut shell-gravel layer is placed, with a walnut shell and gravel particle size of 10mm and a volume ratio of 1:4.

[0080] (2) The device has a water carrying capacity of 10.0L. The device is intermittently aerated for 1h twice within 24h in a water-saturated state. Then the electric drainage gate is opened for 5min to empty the treated water in the device.

[0081] (3) The average removal rates of the ecological filter tank system 100 for nitrate, TN, TP, Cu 2+ , Cr 6+ and hexachlorobenzene in contaminated groundwater during a 30-day stable operation period are 88%, 85%, 90%, 92%, 94% and 95%, respectively.

[0082] Specific application example 2

[0083] (1) The inflow of the ecological filter system 100 is contaminated groundwater, in which the nitrate content is 14 mg / L, the TN content is 15 mg / L, the TP is 0.8 mg / L, the Cu 2+ content is 1.8 mg / L, the Cr 6+ content is 0.18 mg / L, and the hexachlorobenzene content is 2.5 mg / L. The contaminated groundwater is pumped into the adjusting tank 11. In a cylindrical polyethylene filter with a diameter of 0.3 m and a height of 1.0 m, a 0.1 m thick gravel drainage layer 24 is arranged at the lower part, and the upper part is filled with activated carbon with a particle size of 10 mm, with a filling height of 0.2 m; the upper part is filled with a mixed filler of walnut shell and iron-carbon, with a volume ratio of 1:6, and the filling height is 0.4 m; the particle size of iron-carbon is 8 mm, and the particle size of walnut shell is 8 mm; the functional reaction filler layer 22 is soaked in the microbial liquid for 7 days; the upper part is placed with a 0.1 m thick walnut shell-gravel layer, with a particle size of 8 mm and a volume ratio of 1:4.

[0084] (2) The device has a water capacity of 12.0 L. The device is intermittently aerated for 1 h twice within 24 h in a water-saturated state. Then the electric drainage gate is opened for 5 min to empty the treated water in the device.

[0085] (3) The average removal rates of nitrate, TN, TP, Cu 2+ , Cr 6+ , and hexachlorobenzene in the contaminated groundwater in the ecological filter system 100 during the 30-day stable operation period are 90%, 88%, 86%, 94%, 96%, and 96%, respectively.

[0086] Specific application example 3

[0087] (1) The inflow of the ecological filter system 100 is contaminated groundwater, in which the nitrate content is 13 mg / L, the TN content is 15.0 mg / L, the TP is 0.8 mg / L, the Cu 2+ content is 1.8 mg / L, the Cr 6+ content is 0.15 mg / L, and the hexachlorobenzene content is 2.3 mg / L. In a rectangular polyethylene filter with a length of 0.4 m, a width of 0.4 m, and a height of 0.8 m, a 0.1 m thick gravel drainage layer 24 is arranged at the lower part, and the upper part is filled with an activated carbon filter layer 23 with a particle size of 10 mm, with a filling height of 0.15 m; the upper part is filled with a mixed filler of walnut shell and iron-carbon, with a volume ratio of 1:5, and the filling height is 0.5 m; the particle size of iron-carbon is 10 mm, and the particle size of walnut shell is 10 mm; the functional reaction filler layer 22 is soaked in the microbial liquid for 7 days; the upper part is placed with a 0.1 m thick walnut shell-gravel layer, with a particle size of 10 mm and a volume ratio of 1:5. The device has a water capacity of 14.0 L.

[0088] (2) The device is intermittently aerated twice within 24 hours in a water-saturated state, each time for 2 hours. Then, the electric drainage gate is opened for 7 minutes to empty the treated water in the device.

[0089] (3) The average removal rates of nitrate, TN, TP, Cu 2+ , Cr 6+ , and hexachlorobenzene in the contaminated groundwater by the ecological filter system 100 during a 50-day stable operation period are 91%, 89%, 87%, 93%, 96%, and 97%, respectively.

[0090] Specific application example 4

[0091] (1) The inflow of the ecological filter system 100 is contaminated groundwater, in which the content of nitrate is 10 mg / L, the content of TN is 12 mg / L, the content of TP is 1.0 mg / L, the content of Cu 2+ is 1.8 mg / L, the content of Cr 6+ is 0.15 mg / L, and the content of hexachlorobenzene is 2.0 mg / L. In a cylindrical polyethylene filter with a diameter of 0.2 m and a height of 0.9 m, a 0.1 m-thick gravel drainage layer 24 is arranged at the lower part, and then a 0.2 m-high activated carbon layer with a particle size of 10 mm is filled thereon; a mixed filler of walnut shell and iron-carbon with a volume ratio of 1:6 is filled in the upper part, and the filling height is 0.4 m; the particle size of the iron-carbon is 7 mm, and the particle size of the walnut shell is 7 mm; the functional reaction filler layer 22 is soaked in the microbial liquid for 6 days; and then a 0.1 m-thick walnut shell-gravel layer is arranged on the upper part, and the particle size of the walnut shell and the gravel is 8 mm, and the volume ratio is 1:4.

[0092] (2) The water capacity of the device is 12.0 L. The device is intermittently aerated twice within 24 hours in a water-saturated state, each time for 1.5 hours. Then, the electric drainage gate is opened for 5 minutes to empty the treated water in the device.

[0093] (3) The average removal rates of nitrate, TN, TP, Cu 2+ , Cr 6+ , and hexachlorobenzene in the contaminated groundwater by the ecological filter system 100 during a 60-day stable operation period are 88%, 86%, 87%, 95%, 97%, and 94%, respectively.

[0094] The principles and implementation modes of the specific examples are described in the utility model, and the above examples are only used to help understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation modes and application ranges will be changed by the general technical personnel in the field. In conclusion, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. An ecological filter system, characterized by: The columnar treatment filter tank and an aeration device are comprised; An inlet for injecting contaminated groundwater is arranged above the columnar treatment filter tank, and a drainage outlet is arranged below the columnar treatment filter tank; a functional reaction filler layer is arranged in the columnar treatment filter tank; The functional reaction filler layer comprises iron-carbon fillers, which are iron-carbon spherical balls formed by mixing iron filings and biochar, and are soaked in a bacterial solution obtained by expanding organic matter degrading denitrifying bacteria; The aeration device comprises an aeration pipe located in the functional reaction filler layer.

2. The ecological filter system according to claim 1, characterized in that: A gravel filler layer is further arranged in the columnar treatment filter tank; In the vertical direction, the gravel filler layer is located above the functional reaction filler layer.

3. The ecological filter system according to claim 2, characterized in that: An activated carbon filter layer is further arranged in the columnar treatment filter tank, and the activated carbon filter layer comprises activated carbon particles; In the vertical direction, the activated carbon filter layer is located below the functional reaction filler layer.

4. The ecological filter system according to claim 3, characterized in that: A gravel drainage layer is further arranged in the columnar treatment filter tank, and the gravel drainage layer comprises drainage gravel particles; In the vertical direction, the gravel drainage layer is located below the activated carbon filter layer.

5. The ecofilter system of claim 1, wherein: A water inlet device is further comprised; The water inlet device comprises a regulating tank, a water inlet pipe and a water distributor which are sequentially connected; The regulating tank is located above the columnar treatment filter tank, and is used for containing contaminated groundwater; The water distributor is located directly above the inlet of the columnar treatment filter tank.

6. The ecofilter system of claim 1, wherein: The aeration device comprises the aeration pipe, an air pipe and a gas pump; Both ends of the aeration pipe are blocked, and the aeration pipe is provided with aeration holes on the side wall; one end of the air pipe is connected and communicated with the gas output port of the gas pump, and the other end of the air pipe is located in the aeration pipe.

7. The ecological filter system of claim 4, wherein: The volume ratio of the gravel filler layer, the functional reaction filler layer, the activated carbon filter layer and the gravel drainage layer is 1:4-5:1-2:

1.

8. The ecological filter system of claim 6, wherein: The aeration device further comprises a solar power supply system; the solar power supply system comprises a time relay, a storage battery and a solar panel; The storage battery is electrically connected with the gas pump, and the time relay is arranged in the control circuit of the gas pump; the solar panel is electrically connected with the storage battery.

9. The ecofilter system of claim 1, wherein: The functional reaction filler layer further comprises waste plant matter, and the waste plant matter comprises waste walnut shells.

10. The ecofilter system of claim 4, wherein: The trapped gravel particles and the trapped walnut shells of the gravel filler layer have a particle size of 10-20 mm; The iron-carbon spherical balls have a particle size of 5-10 mm; The activated carbon particles have a particle size of 10-15 mm; The drainage gravel particles have a particle size of 15-25 mm.

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