Resource recovery type black and grey water treatment system

Abstract

The invention provides a resource recovery type black and grey water treatment system. The system comprises an oil separation device, a filtering device, a grey water treatment unit, a three-grid septic tank and an ecological percolation device, wherein the oil separation device comprises a kitchen grey water inlet, a grease outlet and an oil separation grey water outlet; the filtering device comprises a bathing and clothes washing grey water inlet, an impurity outlet and a filtered grey water outlet; the grey water treatment unit comprises a coagulative precipitation device, a filtering and decolorizing device, a UV disinfection device and a storage device; the coagulative precipitation device comprises an oil-separated grey water inlet, a filtered grey water inlet, a first water outlet and a second water outlet; the filtering and decoloring device comprises a water inlet and a filtered and decolored water outlet; the UV disinfection device comprises a filtered and decolored water inlet and a disinfected water outlet; the storage device comprises a disinfected water inlet and a water outlet; the three-grid septic tank comprises a first grid, a second grid and a third grid which are connected, the first grid comprises a toilet flushing black water inlet, and the third grid comprises a mixed water outlet; the ecological percolation device comprises a mixed water inlet and a harmless water outlet.

Description

Technical Field

[0001] The invention belongs to the field of water treatment, and in particular relates to a resource recovery type black ash water treatment system. Background Art

[0002] It can be found that the domestic sewage treatment rate is low, and there is still a large gap with the penetration rate of sanitary toilets. The coordination between toilet feces and sewage treatment in farmers' households is insufficient, and the resource utilization rate of sewage is low. The main reasons include:

[0003] 1. Most rural areas are populated by scattered residents, and using the urban pipe network model to treat sewage is costly to build and maintain, making it difficult for the village collective economy to bear the cost.

[0004] 2. Rural household decentralized courtyard sewage treatment systems often draw inspiration from the Japanese septic tank model and use an integrated sewage treatment process. Generally, black and gray water are uniformly fed into the equipment and purified through biochemical treatment and other methods before being discharged in compliance with discharge standards. This equipment requires high technical requirements for operation and maintenance, is costly, and suffers from unstable operation and poor water quality.

[0005] 3. Some rural households have implemented toilet renovations and built septic tanks and other treatment facilities, but these efforts only treat rural blackwater, returning it to the fields for reuse. Graywater is not effectively treated. If this graywater is passed into septic tanks, the decontamination of the blackwater will be compromised, and septic tanks cannot effectively treat all pollutants in wastewater.

[0006] 4. Some technical models directly connect small-scale constructed wetlands, soil infiltration, and other ecological treatment systems behind farmers' existing septic tanks. These systems process the black and gray water into the septic tanks for treatment before further purification in the ecological treatment systems. These constructed wetlands or soil infiltration systems primarily utilize local soil as the substrate and undergo simple water distribution. This technology generally provides poor treatment results, resulting in a low rate of effluent meeting standards, making repairs and replacements difficult, and still leading to low water resource utilization.

[0007] Rural domestic sewage primarily consists of kitchen wastewater, bathing and laundry wastewater, and toilet flushing wastewater generated by farmers in their daily lives. The first two are generally referred to as graywater, while toilet wastewater is referred to as blackwater. Rural graywater contains lower levels of pollutants such as COD, nitrogen, and phosphorus than blackwater, making it easier to treat and utilize. Currently, rural blackwater and graywater are typically treated using a hybrid approach, utilizing biochemical and biochemical treatment systems such as AO, A2O, MBR, and MBBR. The effluent is then used in farmland or discharged directly. However, agricultural water use is seasonal, and resource utilization remains low.

[0008] Therefore, the existing black ash water treatment system for courtyard households needs to be improved. Summary of the Invention

[0009] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0010] In one aspect of the present invention, a resource recovery type black ash water treatment system is provided. According to an embodiment of the present invention, the system comprises:

[0011] A grease separator, comprising a kitchen grey water inlet, a grease outlet and a grease-separated grease water outlet, and adapted to separate the kitchen grey water from the grease to obtain grease and grease-separated grease water;

[0012] A filtering device, comprising a bathing and laundry grey water inlet, a debris outlet, and a filtered grey water outlet, and adapted to filter the bathing and laundry grey water to obtain filtered grey water and debris including hair;

[0013] A grey water treatment unit, comprising:

[0014] A coagulation and sedimentation device, wherein the coagulation and sedimentation device has a coagulant therein, and comprises an oil-water separation ash water inlet, a filtered gray water inlet, a first water outlet, and a second water outlet, wherein the oil-water separation ash water inlet is connected to the oil-water separation ash water outlet, and the filtered gray water inlet is connected to the filtered gray water outlet, and is adapted to remove LAS from the oil-water separation ash water and the filtered gray water to obtain LAS-removed water;

[0015] A filtering and decolorizing device, comprising a water inlet and a filtered and decolorized water outlet, wherein the water inlet is connected to the first water outlet and is suitable for filtering and decolorizing the LAS-removed water to obtain filtered and decolorized water;

[0016] A UV disinfection device, comprising a filtered and decolorized water inlet and a disinfected water outlet, wherein the filtered and decolorized water inlet is connected to the filtered and decolorized water outlet and is suitable for performing UV disinfection on the filtered and decolorized water to obtain disinfected water;

[0017] a storage device, the storage device comprising a disinfected water inlet and a water outlet, the disinfected water inlet being connected to the disinfected water outlet, the water outlet being connected to the flushing port of the toilet, and being adapted to store the disinfected water and supply the disinfected water to the toilet as flushing water;

[0018] A three-compartment septic tank, the three-compartment septic tank comprising a first compartment, a second compartment, and a third compartment connected to each other, the first compartment comprising a black water inlet for toilet flushing, the third compartment comprising a mixed water outlet, the second water outlet being connected to the third compartment and adapted to supply the black water for toilet flushing to the first compartment and then mix it with the LAS-removed water through the second compartment to obtain mixed water;

[0019] The ecological filtration device includes a mixed water inlet and a harmless water outlet. The mixed water inlet is connected to the mixed water outlet and is suitable for filtration treatment of the mixed water to obtain harmless water.

[0020] The system of the present invention addresses the water quality characteristics of graywater (which has a relatively low pollutant content and is easier to treat) and blackwater (which has a high concentration and requires pretreatment). By separating the graywater from the blackwater and treating it for its different qualities, the system uses a portion of the LAS-removed water obtained after coagulation and sedimentation. This water is then filtered, decolorized, and UV-disinfected before being used as toilet flushing water. This simple purification of the graywater ensures that it does not affect cleaning effectiveness, harms human health, and provides sensory comfort, allowing it to be reused for toilet flushing, replacing conventional flushing water and conserving water resources. The LAS-removed water remaining from the coagulation and sedimentation stage is fed into a three-compartment septic tank for synergistic treatment, reducing blackwater pollutant concentrations, adjusting the carbon-nitrogen ratio, and improving treatment efficiency. Finally, the treated mixed water is fed into an ecological infiltration device for purification, allowing it to be used in farmland or, if there is no demand, discharged in compliance with standards. Thus, the system of the present invention allows for the separation and utilization of graywater based on the water quality characteristics of both graywater and blackwater, effectively utilizing water resources and achieving cost-effective and efficient treatment of blackwater and graywater within farmers' households. This is of great significance in addressing the current challenges of combined toilet and sewage treatment within farmers' households in my country and improving water resource utilization.

[0021] In addition, the resource recovery type black ash water treatment system according to the above embodiment of the present invention may also have the following additional technical features:

[0022] In some embodiments of the present invention, the coagulation and sedimentation device includes a coagulation tank and a sedimentation tank, the coagulation tank includes the oil-separating ash water inlet, the filtered ash water inlet, the coagulant, an overflow port and an agitator, the sedimentation tank includes a coagulated water inlet, a mud-water separator, the first water outlet and the second water outlet, in the height direction of the sedimentation tank, the first water outlet is located above the second water outlet, the second water outlet is located above the mud-water separator, the mud-water separator is located above the coagulated water inlet, and the coagulated water inlet is connected to the overflow port.

[0023] In some embodiments of the present invention, a water level monitoring component is further provided in the storage device, and a control component is provided in the sedimentation tank. The control component is connected to the water level monitoring component, and the control component controls the opening of the first water outlet and the second water outlet based on feedback from the water level detection component.

[0024] In some embodiments of the present invention, the water outlet is located at the upper end of the storage device, and the water level detection assembly includes a first liquid level sensor and a second liquid level sensor. The first liquid level sensor is located at the water outlet, and the distance between the second liquid level sensor and the bottom of the storage device is 1 / 4-1 / 3 of the height of the storage device.

[0025] In some embodiments of the present invention, the filtering and decolorizing device includes a first zone, a second zone and a third zone, a first partition is provided between the first zone and the second zone, the first zone and the second zone are connected through the bottom of the first partition, a second partition is provided between the second zone and the third zone, the second zone and the third zone are connected through the top of the second partition, the first zone includes a first filler zone, the first filler zone includes an inorganic filler, the water inlet is provided in the first zone and in the height direction of the first zone, the water inlet is located above the first filler zone, the second zone includes a second filler zone, the second filler zone includes a mixed filler of biochar and activated carbon, the third zone includes a third filler zone, the third filler zone includes modified activated carbon, the third zone includes the filtered and decolorized water outlet, and in the height direction of the third zone, the filtered and decolorized water outlet is located above the third filler zone.

[0026] In some embodiments of the present invention, the inorganic filler includes one or more of straw, construction waste, gravel and sand.

[0027] In some embodiments of the present invention, the volume average particle size Dv50 of the inorganic filler is 8-20 mm.

[0028] In some embodiments of the present invention, the mass ratio of the biochar to the activated carbon in the mixed filler is 3-10:1.

[0029] In some embodiments of the present invention, the specific surface area of the biochar is 80-450m 2 / g.

[0030] In some embodiments of the present invention, the volume average particle size Dv50 of the mixed filler is 3-8 mm.

[0031] In some embodiments of the present invention, the modified activated carbon has oxygen-containing groups.

[0032] In some embodiments of the present invention, the specific surface area of the modified activated carbon is 500-1200 m 2 / g.

[0033] In some embodiments of the present invention, the volume average particle size Dv50 of the modified activated carbon is 3-8 mm.

[0034] In some embodiments of the present invention, the volume ratio of the first compartment, the second compartment, and the third compartment is 2:1:(3-6).

[0035] In some embodiments of the present invention, the ecological infiltration device includes from top to bottom: a water inlet layer, the water inlet layer includes a water distribution component, the mixed water inlet is arranged on the water distribution component and the water distribution component is provided with a water distribution port; a water distribution layer, the water distribution layer includes inorganic material particles; a first treatment layer, the first treatment layer includes soil, biochar, zeolite and volcanic rock; a second treatment layer, the second treatment layer includes zero-valent iron micro-electrolytic iron-carbon filler; a third treatment layer, the third treatment layer includes soil, zeolite and fly ash; a water outlet layer, the water outlet layer includes a collecting component, the collecting component is provided with a collecting port and the harmless water outlet, and the collecting port is connected to the third treatment layer.

[0036] In some embodiments of the present invention, the first treatment layer comprises 40-60 parts by weight of soil, 20-30 parts by weight of volcanic rock, and 10-25 parts by weight of biochar and zeolite.

[0037] In some embodiments of the present invention, the second treatment layer comprises 40-70 parts by weight of soil, 20-30 parts by weight of zeolite, and 5-15 parts by weight of fly ash.

[0038] In some embodiments of the present invention, the thickness of the water distribution layer is 150-200 mm.

[0039] In some embodiments of the present invention, the inorganic material particles include one or more of porcelain sand ceramsite, medical stone and gravel.

[0040] In some embodiments of the present invention, the volume average particle size Dv50 of the inorganic material particles is 20-50 mm.

[0041] In some embodiments of the present invention, the thickness of the first treatment layer is 300-400 mm.

[0042] In some embodiments of the present invention, the thickness of the second treatment layer is 50-150 mm.

[0043] In some embodiments of the present invention, the thickness of the third treatment layer is 300-400 mm.

[0044] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0046] Figure 1 2. It is a structural diagram of a resource recovery type black and gray water treatment system according to one embodiment of the present invention;

[0047] Figure 2 2. It is a structural schematic diagram of a coagulation and sedimentation device in a resource recovery type black ash water treatment system according to one embodiment of the present invention;

[0048] Figure 3 2. It is a schematic structural diagram of a filtering and decolorizing device in a resource recovery type black and gray water treatment system according to one embodiment of the present invention;

[0049] Figure 4 2. It is a structural schematic diagram of a UV disinfection device in a resource recovery type black ash water treatment system according to an embodiment of the present invention;

[0050] Figure 5 2 is a schematic structural diagram of a storage device in a resource recovery type black and gray water treatment system according to an embodiment of the present invention;

[0051] Figure 6 Schematic diagram of the structure of an ecological infiltration device in a resource recovery type black ash water treatment system according to an embodiment of the present invention.

[0052] Description of reference numerals:

[0053] 100- Grease separator; 101- Kitchen grey water inlet; 102- Grease outlet; 103- Grease separator grey water outlet;

[0054] 200-Filtering device; 201-Bathroom and laundry grey water inlet; 202-Miscellaneous outlet; 203-Filtered grey water outlet;

[0055] 300-grey water treatment unit; 31-coagulation and sedimentation device; 311-grease-separated grey water inlet; 312-filtered grey water inlet; 313-first water outlet; 314-second water outlet; 315-coagulation tank; 316-sedimentation tank; 317-overflow; 318-mixer; 319-coagulated water inlet; 320-mud-water separator; 32-filtration and decolorization device; 321-water inlet; 322-filtered and decolorized water outlet; 323-first zone; 324-second zone; 32 5 - Third zone; 326 - First baffle; 327 - Second baffle; 328 - First filling zone; 329 - Second filling zone; 330 - Third filling zone; 33 - UV disinfection device; 331 - Filtered and decolorized water inlet; 332 - Disinfected water outlet; 333 - Low-pressure, high-intensity UV lamp; 34 - Storage device; 341 - Disinfected water inlet; 342 - Water outlet; 343 - Flush port; 35 - Water level monitoring assembly; 351 - First liquid level sensor; 352 - Second liquid level sensor;

[0056] 400-three-compartment septic tank; 41-first compartment; 42-second compartment; 43-third compartment; 401-black water inlet for flushing toilets; 402-mixed water outlet;

[0057] 500-ecological infiltration device; 501-mixed water inlet; 502-harmless water outlet; 51-water inlet layer; 511-water distribution component; 503-water distribution outlet; 52-water distribution layer; 53-first treatment layer; 54-second treatment layer; 55-third treatment layer; 56-water outlet layer; 561-collection component; 504-collection outlet. DETAILED DESCRIPTION

[0058] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 should not be understood as limiting the present invention.

[0060] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] In one aspect of the present invention, the present invention proposes a resource recovery type black ash water treatment system. According to an embodiment of the present invention, reference Figure 1 The treatment system includes an oil separator 100, a filtering device 200, a gray water treatment unit 300, a three-compartment septic tank 400 and an ecological infiltration device 500.

[0063] According to an embodiment of the present invention, referring to Figure 1 The grease separator 100 includes a kitchen grey water inlet 101, a grease outlet 102 and a grease-separating grease water outlet 103, and is suitable for separating kitchen grey water to obtain grease and grease-separating grease water.

[0064] According to a specific embodiment of the present invention, kitchen gray water generally contains a high oil content. It can be collected separately and then supplied to a grease trap 100 to remove grease and other substances. The grease trap 100 can be square or circular, with a side length (diameter) of 250 mm to 500 mm. It should be noted that the grease trap 100 can be any device known in the art that can achieve oil-water separation. Those skilled in the art can select a suitable device based on their specific needs, and this will not be further described here.

[0065] According to an embodiment of the present invention, referring to Figure 1 The filtering device 200 includes a bathing and laundry gray water inlet 201, a debris outlet 202 and a filtered gray water outlet 203, and is suitable for filtering the bathing and laundry gray water to obtain filtered gray water and debris including hair.

[0066] Specifically, the gray water from bathing and laundry is collected uniformly through pipes and enters the filter device 200 to filter out hair and other debris to avoid clogging of subsequent processing facilities. The pore size of the filter in the filter device 200 can be 0.5-5 mm.

[0067] According to an embodiment of the present invention, referring to Figure 1 and 2 The grey water treatment unit 300 includes a coagulation and sedimentation device 31 , a filtration and decolorization device 32 , a UV disinfection device 33 and a storage device 34 .

[0068] According to a specific embodiment of the present invention, Figure 1 and 2 The coagulation and sedimentation device 31 contains a coagulant (not shown). The coagulation and sedimentation device 31 includes an oil-water ash water inlet 311, a filtered gray water inlet 312, a first water outlet 313, and a second water outlet 314. The oil-water ash water inlet 311 is connected to the oil-water ash water outlet 103, and the filtered gray water inlet 312 is connected to the filtered gray water outlet 203. The device is suitable for removing LAS from the oil-water ash water and the filtered gray water to obtain water after removing LAS. Specifically, because LAS (anionic surfactant) in gray water has the characteristics of penetration, emulsification, and foaming, LAS in the gray water reduces the cleaning power of water due to foaming and emulsification during flushing, reduces the flushing effect, and easily covers feces and dirt, causing bacteria to grow in the toilet trap. The present application removes LAS from gray water by using a coagulation and sedimentation device 31, which can reduce foaming and emulsification, improve the flushing effect, and reduce bacterial growth.

[0069] Furthermore, the coagulant used in the coagulation and sedimentation device 31 may be biodegradable and free of secondary pollution, and may include, for example, one or a combination of cationic grafted cellulose-based coagulants, polymerized cationic modified starch, and chitosan.

[0070] According to a specific embodiment of the present invention, referring to Figure 2The coagulation and sedimentation device 31 includes a coagulation tank 315 and a sedimentation tank 316. The coagulation tank 315 includes an oil-separated ash water inlet 311, a filtered ash water inlet 312, a coagulant, an overflow port 317 and an agitator 318. The sedimentation tank 316 includes a coagulated water inlet 319, a mud-water separator 320, a first water outlet 313 and a second water outlet 314. In the height direction of the sedimentation tank 316, the first water outlet 313 is located above the second water outlet 314, and the second water outlet 314 is located above the mud-water separator 320. The mud-water separator 320 is located above the coagulated water inlet 319, and the coagulated water inlet 319 is connected to the overflow port 317, that is, the oil-separated ash water obtained by the oil separator 100 and the filtered ash water obtained by the filtering device 200 are supplied to the coagulation tank 315 and mixed with the coagulant for coagulation treatment to remove LAS in the oil-separated ash water and the filtered ash water. The coagulated water overflows through the overflow port 317 and enters the sedimentation tank 316 through the coagulated water inlet 319, and then passes through the mud-water separator 320 to obtain LAS-free water.

[0071] According to an embodiment of the present invention, referring to Figure 1 and 3 The filtering and decolorizing device 32 includes a water inlet 321 and a filtered and decolorized water outlet 322. The water inlet 321 is connected to the first water outlet 313 and is suitable for filtering and decolorizing the LAS-removed water to obtain filtered and decolorized water.

[0072] According to a specific embodiment of the present invention, Figure 3The filtering and decolorizing device 32 includes a first zone 323, a second zone 324 and a third zone 325. A first partition 326 is provided between the first zone 323 and the second zone 324. The first zone 323 and the second zone 324 are connected through the bottom of the first partition 326. A second partition 327 is provided between the second zone 324 and the third zone 325. The second zone 324 and the third zone 325 are connected through the top of the second partition 327. The first zone 323 includes a first filler zone 328, and the first filler zone 328 includes an inorganic filler. The water inlet 321 is provided in the first zone 323 and in the height direction of the first zone 323. The water inlet 321 is located above the first filler zone 328. The second zone 324 includes a second filler zone 329, and the second filler zone 329 includes a mixed filler of biochar and activated carbon. The third zone 325 includes a third filler zone 330, which includes modified activated carbon. The third zone 325 includes a filtered and decolorized water outlet 322. In the height direction of the third zone 325, the filtered and decolorized water outlet 322 is located above the third filler zone 330, that is, the water after removing LAS is supplied to the first zone 323 through the water inlet 321, and is initially filtered and decolorized by the inorganic filler in the first filler zone 328 in the first zone 323. The water separated by the first filler zone 328 enters the second zone 324 through the bottom of the first partition 326, and is secondary filtered and decolorized by the mixed filler in the second filler zone 329 in the second zone 324. The water separated by the second filler zone 329 overflows from the top of the second partition 327 into the third zone 324 for deep decolorization to obtain filtered and decolorized water.

[0073] Furthermore, the inorganic filler includes one or more of straw, construction waste, gravel and sand, and the volume average particle size of the inorganic filler is 8-20 mm; the mass ratio of the biochar to the activated carbon in the mixed filler is 3-10:1; the biochar can include straw charcoal, rice husk (walnut shell, peanut shell) charcoal, bamboo charcoal, etc., and the specific surface area of the biochar is 80-450 m 2 / g, and the volume average particle size of the mixed filler is 3-8mm; the modified activated carbon has oxygen-containing groups, and the specific modification method is redox modification, for example, nitric acid, hydrogen peroxide and other oxidants can be selected to modify the activated carbon, adjust the surface functional groups of the activated carbon, increase oxygen-containing groups (-COOH, -OH, etc.), enhance hydrophilicity, and improve adsorption effect; the specific surface area of the modified activated carbon is 500-1200m 2 / g; the volume average particle size of the modified activated carbon is 3-8mm.

[0074] It should be noted that the above-mentioned method of modifying activated carbon using oxidants such as nitric acid and hydrogen peroxide is a conventional operation in the art and will not be repeated here. At the same time, the above-mentioned first filling area 328, the second filling area 329 and the third filling area 330 are all formed by filling the fillers with net bags, which is conducive to quick replacement.

[0075] According to a specific embodiment of the present invention, Figure 1 and 4 The UV disinfection device 33 includes a filtered and decolorized water inlet 331 and a disinfected water outlet 332. The filtered and decolorized water inlet 331 is connected to the filtered and decolorized water outlet 322 and is suitable for performing UV disinfection on the filtered and decolorized water to produce disinfected water. Specifically, the UV disinfection device 33 is equipped with one to four low-pressure, high-intensity UV lamps 333, with a UV dose of 30-160 mJ / cm². The UV lamps are retained in the UV disinfection device 33 for greater than 10 seconds, thereby killing pathogenic microorganisms such as fecal coliform bacteria in the filtered and decolorized water, thereby reducing the health threat posed by toilet flushing water.

[0076] According to a specific embodiment of the present invention, Figure 1 and 5 Storage device 34 includes a disinfected water inlet 341 and a water outlet 342. Disinfected water inlet 341 is connected to disinfected water outlet 332, while water outlet 342 is connected to the toilet's flushing port 343. Disinfected water is stored and supplied to the toilet for flushing. This allows greywater to be simply purified and reused for flushing, without compromising cleaning effectiveness or harming human health, ensuring sensory comfort. This replaces conventional flushing water and conserves water resources.

[0077] It should be noted that the grey water treatment unit 300 of the present invention can be designed as a box structure, that is, the coagulation and sedimentation device 31, the filtration and decolorization device 32, the UV disinfection device 33 and the storage device 34 are integrated into one box to facilitate maintenance and transportation of the equipment.

[0078] According to a specific embodiment of the present invention, Figure 1 The three-compartment septic tank 400 includes a first compartment 41, a second compartment 42 and a third compartment 43 connected to each other. The first compartment 42 includes a black water inlet 401 for flushing toilets, and the third compartment 42 includes a mixed water outlet 402. The second water outlet 314 is connected to the third compartment 43 and is suitable for supplying black water for flushing toilets to the first compartment 41 and then mixing it with the LAS-removed water obtained by the coagulation and sedimentation device 31 through the second compartment 42 to obtain mixed water.

[0079] Specifically, the first compartment 41 and the second compartment 42 of the three-compartment septic tank 400 are anaerobic biological reactions, which are suitable for treating high-concentration wastewater. Therefore, the black water for flushing toilets is supplied to the first compartment 31 and the second compartment 42 for treatment and then mixed with low-concentration gray water, i.e., water after removing LAS, in the third compartment 43. This can improve the treatment efficiency of the first compartment 41 and the second compartment 42. At the same time, during the mixing process of the third compartment 43, the third compartment 43 can be used as a water quality regulating tank to fully mix the black water and the gray water, dilute the concentration of pollutants such as COD, N, and P in the black water, and be beneficial to the subsequent improvement of ecological treatment efficiency. In addition, the nitrogen and phosphorus content of the black water for flushing toilets is relatively high, and the COD / TN is low, resulting in poor biodegradability, while the COD / TN of the gray water is high. After mixing, it is beneficial to adjust the ratio of COD and TN and improve the biodegradability of sewage.

[0080] According to a specific embodiment of the present invention, the effective volume of the three-compartment septic tank 400 is greater than 2m 3 , and the volume ratio of the first compartment 41, the second compartment 42 and the third compartment 43 is 2:1:(3-6), which is conducive to the full mixing and storage of black water and gray water, and the total residence time of black water in the first compartment 41 and the second compartment 42 is greater than 30 days, which is conducive to achieving harmlessness.

[0081] It should be noted that the three-compartment septic tank 400 is a three-compartment septic tank structure commonly used in this field. Those skilled in the art can select the relevant bacterial species in the first compartment 41, the second compartment 42 and the third compartment 43 according to actual needs, which will not be repeated here.

[0082] According to a specific embodiment of the present invention, Figure 5 A water level monitoring component 35 is also provided in the storage device 34, and a control component (not shown) is provided in the sedimentation tank 315. The control component is connected to the water level monitoring component 35. The control component controls the opening of the first water outlet 313 and the second water outlet 314 based on the feedback of the water level detection component 35. For example, by setting an electric valve at the first water outlet 313 and the second water outlet 314, the control component controls the opening of the first water outlet 313 and the second water outlet 314 based on the feedback of the water level detection component 35, that is, adjusts the supply amount of water after LAS removal supplied to the filtering and decolorizing device 32 and the third compartment 43 of the three septic tanks 400.

[0083] Further, refer to Figure 5The water outlet 342 on the storage device 34 is located at the upper end of the storage device 34. The water level detection component 35 includes a first liquid level sensor 351 and a second liquid level sensor 352. The first liquid level sensor 351 is located at the water outlet 342. The distance between the second liquid level sensor 352 and the bottom of the storage device 34 is 1 / 4-1 / 3 of the height of the storage device 34. Specifically, when the water level in the storage device 34 is at a high level (i.e., higher than or equal to the position of the first liquid level sensor 351), the control component controls the closing of the first water outlet 313 and the opening of the second water outlet 314. At this time, the LAS-removed water obtained by the coagulation and sedimentation device 31 flows to the third compartment 43 of the three-compartment septic tank 400 through the second water outlet 314. When the water level in the storage device 34 is at a low level (i.e., lower than or equal to the position of the second liquid level sensor 352), the control component controls the opening of the first water outlet 313 and the closing of the second water outlet 314. At this time, the LAS-removed water obtained by the coagulation and sedimentation device 31 flows to the third compartment 43 of the three-compartment septic tank 400. The post-AS water flows through the first water outlet 313 to the filtration and decolorization device 32 for treatment, and finally flows to the storage tank to replenish water for flushing toilets; when the water level in the storage device 34 is between the first liquid level sensor 351 and the second liquid level sensor 352, the control component controls the simultaneous opening of the first water outlet 313 and the second water outlet 314. At this time, a part of the post-LAS water obtained by the coagulation and sedimentation device 31 flows through the first water outlet 313 to the filtration and decolorization device 32 for treatment, and the other part flows through the second water outlet 314 to the third compartment 43 of the three-compartment septic tank 400 to mix with the black water.

[0084] According to an embodiment of the present invention, referring to Figure 1 and 6 The ecological infiltration device 500 includes a mixed water inlet 501 and a harmless water outlet 502. The mixed water inlet 501 is connected to the mixed water outlet 402 and is suitable for infiltration treatment of the mixed water to obtain harmless water.

[0085] According to a specific embodiment of the present invention, Figure 6The ecological infiltration device 500 includes an inlet layer 51, a water distribution layer 52, a first treatment layer 53, a second treatment layer 54, a third treatment layer 55 and an outlet layer 56 from top to bottom. The inlet layer includes a water distribution component 511, and the mixed water inlet 501 is arranged on the water distribution component 511 and the water distribution component 511 is provided with a water distribution port 503; the water distribution layer 52 includes inorganic material particles, which can distribute the treated mixed water in the third compartment 43 of the three septic tanks 400 and intercept larger impurities; the first treatment layer 53 includes soil, biochar, zeolite and volcanic rock. The water after passing through the water distribution layer 52 mainly undergoes biochemical and physicochemical reactions in the first treatment layer 53 to remove pollutants such as COD, nitrogen and phosphorus in the black gray water. Since the first treatment layer 53 is close to the inlet layer, aerobic and facultative aerobic reaction; the second treatment layer 54 includes zero-valent iron micro-electrolytic iron-carbon filler, which further removes pollutants in the water after treatment by the first treatment layer 52. The zero-valent iron micro-electrolytic iron-carbon filler can form countless micro-battery systems to enhance the removal efficiency of pollutants, especially the treatment efficiency of phosphorus; the third treatment layer 55 includes soil, zeolite and fly ash, which mainly undergo aerobic and anaerobic reactions to further remove pollutants in the water after treatment by the second treatment layer 53; the water outlet layer 56 includes a collection component 561, and the collection component 561 is provided with a collection port 504 and a harmless water outlet 502. The collection port 504 is connected to the third treatment layer 55, that is, the treated water in the third treatment layer 55 is collected into the collection component 561 through multiple collection ports 504 on the collection component 561 for water utilization or discharge in compliance with standards.

[0086] Furthermore, the ecological infiltration device 500 can be a box structure, and the upper cover of the box structure can be opened. When the treatment is saturated or a problem occurs, the filler in the ecological infiltration device 500 can be directly replaced, and the replaced filler can be returned to the field for use.

[0087] Furthermore, the thickness of the water distribution layer is 150-200 mm, the inorganic material particles in the water distribution layer 52 may include one or more of porcelain sand, medical stone and gravel, and the volume average particle size of the inorganic material particles is 20-50 mm; the thickness of the first treatment layer is 300-400 mm, the first treatment layer includes 40-60 parts by weight of soil, 20-30 parts by weight of volcanic rock and 10-25 parts by weight of biochar and zeolite; the thickness of the second treatment layer is 50-150 mm, the second treatment layer includes 40-70 parts by weight of soil, 20-30 parts by weight of zeolite and 5-15 parts by weight of fly ash; the thickness of the third treatment layer is 300-400 mm.

[0088] Furthermore, the resource recovery type black ash water treatment system of the present invention can be a miniaturized box-type device, which is convenient for installation, commissioning, operation and maintenance management.

[0089] The system of the present invention addresses the water quality characteristics of graywater (which has a relatively low pollutant content and is easier to treat) and blackwater (which has a high concentration and requires pretreatment). By separating the graywater from the blackwater and treating it for its different qualities, the system uses a portion of the LAS-removed water obtained after coagulation and sedimentation. This water is then filtered, decolorized, and UV-disinfected before being used as toilet flushing water. This simple purification of the graywater ensures that it does not affect cleaning effectiveness, harms human health, and provides sensory comfort, allowing it to be reused for toilet flushing, replacing conventional flushing water and conserving water resources. The LAS-removed water remaining from the coagulation and sedimentation stage is fed into a three-compartment septic tank for synergistic treatment, reducing blackwater pollutant concentrations, adjusting the carbon-nitrogen ratio, and improving treatment efficiency. Finally, the treated mixed water is fed into an ecological infiltration device for purification, allowing it to be used in farmland or, if there is no demand, discharged in compliance with standards. Thus, the system of the present invention allows for the separation and utilization of graywater based on the water quality characteristics of both graywater and blackwater, effectively utilizing water resources and achieving cost-effective and efficient treatment of blackwater and graywater within farmers' households. This is of great significance in addressing the current challenges of combined toilet and sewage treatment within farmers' households in my country and improving water resource utilization.

[0090] The examples described below are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention. Where specific techniques or conditions are not specified in the examples, the methods or conditions described in the literature within the art or in the product specifications were used. Where the manufacturer of the reagents or instruments is not specified, all are commercially available conventional products.

[0091] Example 1

[0092] The water quality of farmers' black water for flushing toilets, kitchen grey water and bathing and laundry grey water is shown in Table 1. Figure 1-6 The kitchen grey water enters the square oil separator (side length is 350mm) to remove grease and obtain oil-separated grey water. The bathing and laundry grey water enters the filter device (filter mesh aperture is 1.5mm) for filtration to remove impurities including hair and obtain filtered grey water. The oil-separated grey water and filtered grey water are supplied to the coagulation tank of the grey water treatment unit, wherein the coagulation tank adopts polymerized cationic modified starch as coagulant. After coagulation in the coagulation tank, the grey water enters the sedimentation tank for sedimentation to remove LAS and other substances in the oil-separated grey water and filtered grey water to obtain LAS-free water. A part of the LAS-free water is supplied to the first zone of the filtration and decolorization device. The inorganic filler in the first filler zone in the first zone is waste straw and gravel, etc., and the average particle size Dv50 of the filler is 15mm; the filler in the second filler zone in the second zone is a mixed filler including biochar and activated carbon, wherein the biochar is rice husk carbon with a specific surface area of 137m 2 / g, the mixing ratio of biochar to activated carbon is 5:1, the average particle size Dv50 of the mixed filler is 5mm, and the filler in the third zone is modified activated carbon treated with hydrogen peroxide, with a specific surface area of 830m 2 / g, with a volume average particle size Dv50 of 6mm. After LAS removal, the water is processed in the first, second and third zones of the filtration and decolorization device to obtain filtered decolorized water, which is then supplied to a UV disinfection device equipped with two low-pressure, high-intensity UV lamps with a UV dose of 50mJ / cm2 and a residence time of more than 30s to obtain disinfected water. The disinfected water is then supplied to a storage device for storage and use as toilet flushing water. The black water from farmers' toilet flushing enters a three-compartment septic tank with an effective volume of 2.5m 3 The volume ratio of the first, second and third compartments is 2:1:4. The black water for flushing toilets passes through the first, second and third compartments in turn. At the same time, the other part of the water after removing LAS obtained in the coagulation and sedimentation device is supplied to the third compartment of the three-compartment septic tank. The mixture and black ash are fermented and mixed in the third compartment. The mixed water enters the ecological infiltration device and passes through the water inlet layer, the water distribution layer (the height of the water distribution layer is 150mm, and the inorganic material particles in the water distribution layer are a mixture of porcelain sand ceramsite and medical stone, with a volume average particle size of Dv5035mm), the first treatment layer (the height of the first treatment layer is 300mm, and the first treatment layer is 150mm). The filler includes a mixture of soil, biochar, zeolite, and volcanic rock, of which soil accounts for 40% by mass, volcanic rock accounts for 26% by mass, zeolite accounts for 12% by mass, and the remainder is biochar); the second treatment layer (the second treatment layer has a layer height of 100mm, and the filler of the second treatment layer is valent iron micro-electrolytic iron-carbon filler); the third treatment layer (the third treatment layer has a layer height of 350mm, and the filler of the third treatment layer includes a mixture of soil, zeolite, and fly ash, of which soil accounts for 65% by mass, zeolite accounts for 20% by mass, and the remainder is fly ash); and the effluent layer, which is treated by the ecological infiltration device and is harmless, and the effluent meets discharge standards. The average water quality of the flushing water stored in the storage device and the harmless water obtained by the ecological infiltration device is shown in Table 1.

[0093] Table 1 Inlet and outlet water quality indicators

[0094]

[0095]

[0096] Example 2

[0097] The water quality of farmers' black water for flushing toilets, kitchen grey water and bathing and laundry grey water is shown in Table 2. Figure 1-6The kitchen grey water enters the square oil separator (side length is 500mm) to remove grease and grease to obtain oil-separated grey water. The bathing and laundry grey water enters the filter device (filter mesh aperture is 3.5mm) for filtration to remove impurities including hair and obtain filtered grey water. The oil-separated grey water and filtered grey water are supplied to the coagulation tank of the grey water treatment unit, wherein the coagulation tank adopts cationic grafted cellulose-based coagulant. After coagulation in the coagulation tank, the grey water enters the sedimentation tank for sedimentation to remove LAS and other substances in the oil-separated grey water and filtered grey water to obtain LAS-free water. A part of the LAS-free water is supplied to the first zone of the filtration and decolorization device. The inorganic filler in the first filler zone in the first zone adopts construction waste and gravel, etc., and the average particle size Dv50 of the filler is 18mm; the filler in the second filler zone in the second zone is a mixed filler including biochar and activated carbon, wherein the biochar is straw charcoal with a specific surface area of 187m 2 / g, the mixing ratio of biochar to activated carbon is 6:1, the average particle size Dv50 of the mixed filler is 3mm, and the filler in the third zone is modified activated carbon treated with hydrogen peroxide, with a specific surface area of 593m 2 / g, with a volume average particle size Dv50 of 6mm. After LAS removal, the water is processed in the first, second and third zones of the filtration and decolorization device to obtain filtered decolorized water. The filtered decolorized water is then supplied to a UV disinfection device equipped with three low-pressure, high-intensity UV lamps with a UV dose of 120mJ / cm2 and a residence time of 20s to obtain disinfected water. The disinfected water is then supplied to a storage device for storage and use as toilet flushing water. The black water from farmers' toilet flushing enters a three-compartment septic tank with an effective volume of 4m 3The volume ratio of the first, second and third compartments is 2:1:5; the black water for flushing toilets passes through the first, second and third compartments in turn, and at the same time, the other part of the water after LAS removal obtained in the coagulation and sedimentation device is supplied to the third compartment of the three-compartment septic tank, and the mixture and black ash are fermented and mixed in the third compartment. The mixed water enters the ecological infiltration device and passes through the water inlet layer, the water distribution layer (the height of the water distribution layer is 180mm, and the inorganic material particles in the water distribution layer are a mixture of medical stone and gravel, with a volume average particle size of Dv5030mm), the first treatment layer (the height of the first treatment layer is 400mm, and the first treatment layer is 180mm). The filler includes a mixture of soil, biochar, zeolite, and volcanic rock, with soil accounting for 60% by mass, volcanic rock accounting for 20% by mass, and zeolite and biochar accounting for 10% by mass, respectively); the second treatment layer (the second treatment layer has a layer height of 50mm and is filled with valence iron micro-electrolytic iron-carbon filler); the third treatment layer (the third treatment layer has a layer height of 400mm and is filled with a mixture of soil, zeolite, and fly ash, with soil accounting for 47% by mass, zeolite accounting for 25% by mass, and the remainder being fly ash); and the effluent layer. The harmless water treated by the ecological infiltration device meets the discharge standards. The average water quality of the flushing water stored in the storage device and the harmless water obtained by the ecological infiltration device is shown in Table 2.

[0098] Table 2 Inlet and outlet water quality indicators

[0099]

[0100] Example 3

[0101] The water quality of farmers’ black water for flushing toilets, kitchen grey water and bathing and laundry grey water is shown in Table 3. Figure 1-6 The kitchen grey water enters the square oil separator (side length is 400mm) to remove grease and grease to obtain oil-separated grey water. The bathing and laundry grey water enters the filter device (filter mesh aperture is 0.5mm) for filtration to remove impurities including hair to obtain filtered grey water. The oil-separated grey water and filtered grey water are supplied to the coagulation tank of the grey water treatment unit, wherein the coagulation tank adopts a mixture of cationic grafted cellulose-based coagulant and chitosan in a mass ratio of 2:1 as a coagulant. After coagulation in the coagulation tank, the grey water enters the sedimentation tank for sedimentation to remove LAS and other substances in the oil-separated grey water and filtered grey water to obtain LAS-free water. A part of the LAS-free water is supplied to the first zone of the filtration and decolorization device. The inorganic filler in the first filler zone in the first zone adopts waste straw, construction waste and gravel, etc., and the average particle size Dv50 of the filler is 8mm; the filler in the second filler zone in the second zone is a mixed filler including biochar and activated carbon, wherein the biochar is bamboo charcoal with a specific surface area of 420m 2 / g, the mixing ratio of biochar to activated carbon is 3:1, the average particle size Dv50 of the mixed filler is 4mm, and the filler in the third zone is modified activated carbon modified with nitric acid, with a specific surface area of 720m 2 / g, with a volume average particle size Dv50 of 5mm. After LAS removal, the water is processed in the first, second and third zones of the filtration and decolorization device to obtain filtered decolorized water. The filtered decolorized water is then supplied to a UV disinfection device equipped with a low-pressure, high-intensity UV lamp with a UV dose of 40mJ / cm2 and a residence time of 40s to obtain disinfected water. The disinfected water is then supplied to a storage device for storage and use as toilet flushing water. The black water from farmers' toilet flushing enters a three-compartment septic tank with an effective volume of 5m 3 The volume ratio of the first, second and third compartments is 2:1:4; the black water for flushing toilets passes through the first, second and third compartments in turn, and at the same time, the other part of the water after removing LAS obtained in the coagulation and sedimentation device is supplied to the third compartment of the three-compartment septic tank, and the mixture and black ash are fermented and mixed in the third compartment. The mixed water enters the ecological infiltration device and passes through the water inlet layer, the water distribution layer (the height of the water distribution layer is 200mm, and the inorganic material particles in the water distribution layer are porcelain sand ceramsite with a volume average particle size of Dv5026mm), the first treatment layer (the height of the first treatment layer is 300mm, and the filler of the first treatment layer includes The system consists of a mixture of soil, biochar, zeolite, and volcanic rock, with soil accounting for 40% by mass, volcanic rock accounting for 30% by mass, and zeolite and biochar accounting for 15% by mass each); a second treatment layer (50 mm high, filled with ferrous micro-electrolyzed iron-carbon filler); a third treatment layer (400 mm high, filled with a mixture of soil, zeolite, and fly ash, with soil accounting for 50% by mass, zeolite accounting for 30% by mass, and the remainder being fly ash); and an outlet layer. The harmless water treated by the ecological infiltration device meets discharge standards. The average water quality of the flushing water stored in the storage device and the harmless water obtained through the ecological infiltration device is shown in Table 3.

[0102] Table 3 Inlet and outlet water quality indicators

[0103]

[0104]

[0105] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0106] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A resource recovery type black ash water treatment system, characterized in that: include: A grease separator, comprising a kitchen grey water inlet, a grease outlet and a grease-separated grease water outlet, and adapted to separate the kitchen grey water from the grease to obtain grease and grease-separated grease water; A filtering device, comprising a bathing and laundry grey water inlet, a debris outlet, and a filtered grey water outlet, and adapted to filter the bathing and laundry grey water to obtain filtered grey water and debris including hair; A grey water treatment unit, comprising: A coagulation and sedimentation device, wherein the coagulation and sedimentation device has a coagulant therein, and comprises an oil-water separation ash water inlet, a filtered gray water inlet, a first water outlet, and a second water outlet, wherein the oil-water separation ash water inlet is connected to the oil-water separation ash water outlet, and the filtered gray water inlet is connected to the filtered gray water outlet, and is adapted to remove LAS from the oil-water separation ash water and the filtered gray water to obtain LAS-removed water; A filtering and decolorizing device, comprising a water inlet and a filtered and decolorized water outlet, wherein the water inlet is connected to the first water outlet and is suitable for filtering and decolorizing the LAS-removed water to obtain filtered and decolorized water; A UV disinfection device, comprising a filtered and decolorized water inlet and a disinfected water outlet, wherein the filtered and decolorized water inlet is connected to the filtered and decolorized water outlet and is suitable for performing UV disinfection on the filtered and decolorized water to obtain disinfected water; a storage device, the storage device comprising a disinfected water inlet and a water outlet, the disinfected water inlet being connected to the disinfected water outlet, the water outlet being connected to the flushing port of the toilet, and being adapted to store the disinfected water and supply the disinfected water to the toilet as flushing water; A three-compartment septic tank, the three-compartment septic tank comprising a first compartment, a second compartment and a third compartment connected to each other, the first compartment comprising a black water inlet for toilet flushing, the third compartment comprising a mixed water outlet, the second water outlet being connected to the third compartment and suitable for supplying black water for toilet flushing to the first compartment and then mixing it with the LAS-removed water through the second compartment to obtain mixed water; an ecological filtration device, the ecological filtration device comprising a mixed water inlet and a harmless water outlet, the mixed water inlet being connected to the mixed water outlet, and suitable for filtration treatment of the mixed water to obtain harmless water.

2. The system according to claim 1, wherein: The coagulation and sedimentation device includes a coagulation tank and a sedimentation tank. The coagulation tank includes the oil-separating ash water inlet, the filtered ash water inlet, the coagulant, an overflow port and an agitator. The sedimentation tank includes a coagulated water inlet, a mud-water separator, the first water outlet and the second water outlet. In the height direction of the sedimentation tank, the first water outlet is located above the second water outlet, the second water outlet is located above the mud-water separator, the mud-water separator is located above the coagulated water inlet, and the coagulated water inlet is connected to the overflow port.

3. The system according to claim 1 or 2, characterized in that The storage device is further provided with a water level monitoring component, and the sedimentation tank is provided with a control component, which is connected to the water level monitoring component. The control component controls the opening of the first water outlet and the second water outlet based on feedback from the water level detection component.

4. The system according to claim 3, characterized in that The water outlet is located at the upper end of the storage device, and the water level detection assembly includes a first liquid level sensor and a second liquid level sensor. The first liquid level sensor is located at the water outlet, and the distance between the second liquid level sensor and the bottom of the storage device is 1 / 4-1 / 3 of the height of the storage device.

5. The system according to claim 4, characterized in that The filtering and decolorizing device includes a first zone, a second zone, and a third zone, a first partition plate is provided between the first zone and the second zone, the first zone and the second zone are connected through the bottom of the first partition plate, a second partition plate is provided between the second zone and the third zone, the second zone and the third zone are connected through the top of the second partition plate, the first zone includes a first filler zone, the first filler zone includes an inorganic filler, the water inlet is provided in the first zone and in the height direction of the first zone, the water inlet is located above the first filler zone, the second zone includes a second filler zone, the second filler zone includes a mixed filler of biochar and activated carbon, the third zone includes a third filler zone, the third filler zone includes modified activated carbon, the third zone includes the filtered and decolorized water outlet, and in the height direction of the third zone, the filtered and decolorized water outlet is located above the third filler zone; Optionally, the inorganic filler includes one or more of straw, construction waste, gravel and sand; Optionally, the volume average particle size Dv50 of the inorganic filler is 8-20 mm; Optionally, the mass ratio of the biochar to the activated carbon in the mixed filler is 3-10:1; Optionally, the specific surface area of the biochar is 80-450m 2 / g; Optionally, the volume average particle size Dv50 of the mixed filler is 3-8 mm; Optionally, the modified activated carbon has oxygen-containing groups; Optionally, the specific surface area of the modified activated carbon is 500-1200m 2 / g; Optionally, the volume average particle size Dv50 of the modified activated carbon is 3-8 mm.

6. The system according to claim 1, wherein: The volume ratio of the first compartment, the second compartment and the third compartment is 2:1:(3-6).

7. The system according to claim 1 or 5, characterized in that The ecological infiltration device comprises, from top to bottom: A water inlet layer, the water inlet layer includes a water distribution component, the mixed water inlet is provided on the water distribution component and the water distribution component is provided with a water distribution port; a water distribution layer comprising inorganic material particles; a first treatment layer comprising soil, biochar, zeolite, and volcanic rock; a second treatment layer comprising a zero-valent iron micro-electrolytic iron-carbon filler; a third treatment layer, the third treatment layer comprising soil, zeolite and fly ash; The water outlet layer includes a collecting component, the collecting component is provided with a collecting port and the harmless water outlet, and the collecting port is communicated with the third treatment layer.

8. The system according to claim 7, characterized in that The first treatment layer includes 40-60 parts by weight of soil, 20-30 parts by weight of volcanic rock, and 10-25 parts by weight of biochar and zeolite.

9. The system according to claim 7 or 8, characterized in that The second treatment layer includes 40-70 parts by weight of soil, 20-30 parts by weight of zeolite and 5-15 parts by weight of fly ash.

10. The system according to claim 7, wherein: One or more of the following conditions are met: The thickness of the water distribution layer is 150-200mm; The inorganic material particles include one or more of porcelain sand ceramsite, medical stone and gravel; The volume average particle size Dv50 of the inorganic material particles is 20-50 mm; The thickness of the first treatment layer is 300-400 mm; The thickness of the second treatment layer is 50-150 mm; The thickness of the third treatment layer is 300-400 mm.

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