Resource recovery type black and grey water treatment system

Abstract

The application provides a resource recycling type black and grey water treatment system, which comprises an oil separation device, a filtering device, a grey water treatment unit, a three-chamber septic tank and an ecological infiltration device; 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 laundry grey water inlet, a sundry outlet and a filtered grey water outlet; the grey water treatment unit comprises a coagulation and sedimentation device, a filtering and decoloring device, a UV disinfection device and a storage device; the coagulation and sedimentation device comprises an oil separation 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 decolorized water outlet; the UV disinfection device comprises a filtered and decolorized water inlet and a disinfected water outlet; the storage device comprises a disinfected water inlet and a water outlet; the three-chamber septic tank comprises a first chamber, a second chamber and a third chamber which are connected; the first chamber comprises a toilet black water inlet; the third chamber comprises a mixed water outlet; and the ecological infiltration device comprises a mixed water inlet and a harmless water outlet.

Description

Technical Field

[0001] This invention belongs to the field of water treatment, specifically relating to a resource-recycling black and gray water treatment system. Background Technology

[0002] It can be observed that the rate of domestic sewage treatment is low, and there is still a significant gap compared to the coverage rate of sanitary toilets. The coordination between toilet waste and sewage treatment in rural households is insufficient, and the resource utilization rate of sewage is low. The main reasons include:

[0003] 1. In rural areas, most residents live scattered, and using urban pipe network models to treat sewage results in high construction and operation costs, which are difficult for village collective economies to bear;

[0004] 2. Rural household decentralized courtyard sewage treatment systems mostly draw on the Japanese septic tank model, adopting an integrated sewage treatment process. Generally, black and gray water is uniformly introduced into the equipment and purified through biological treatment and other methods to meet the discharge standards. The equipment operation and maintenance technology requirements are high, the cost is high, and there are problems such as unstable operation and poor water output.

[0005] 3. Some rural households have implemented toilet renovations and constructed septic tanks and other treatment facilities, but these only treat black water (sewage) to render it harmless, and the treated black water is then returned to the fields for reuse. Grey water is not effectively treated. If grey water is channeled into septic tanks, it will affect the harmless treatment effect of the black water, and septic tanks cannot effectively treat all pollutants in sewage.

[0006] 4. Some technical models directly connect small-scale constructed wetlands, soil infiltration, or other ecological treatment systems after the septic tanks already built by farmers. The black and grey water is treated in the septic tanks and then further purified in the ecological treatment system. Constructed wetlands or soil infiltration systems primarily use local soil as the substrate and undergo simple water distribution treatment. This technical model generally has poor treatment effects, a low rate of effluent meeting standards, and is difficult to repair or replace when problems arise. Furthermore, it still suffers from low water resource utilization.

[0007] Rural domestic sewage mainly includes 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 grey water, while toilet wastewater is called black water. Grey water in rural areas has relatively low levels of pollutants such as COD, nitrogen, and phosphorus compared to black water, making it easier to treat and utilize. Currently, the treatment of black and grey water in rural areas generally employs mixed treatment methods, utilizing biological and other treatment systems such as the AO process, A2O, MBR, and MBBR. The effluent is then used in farmland or directly discharged. However, farmland water use is seasonal, and the resource utilization rate remains low.

[0008] Therefore, the existing household black and gray water treatment systems in courtyards need to be improved. Summary of the Invention

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

[0010] In one aspect of the invention, a resource-recycling black and grey water treatment system is provided. According to an embodiment of the invention, the system includes:

[0011] An oil separator, comprising a kitchen ash water inlet, an grease outlet, and an oil-separated ash water outlet, and adapted to perform oil separation treatment on kitchen ash water to obtain grease and oil-separated ash water;

[0012] A filtration device, comprising a bathing and laundry greywater inlet, a debris outlet, and a filtered greywater outlet, and adapted to filter bathing and laundry greywater to obtain filtered greywater and debris including hair;

[0013] Grey water treatment unit, the grey water treatment unit comprising:

[0014] A coagulation and sedimentation device containing a coagulant, the coagulation and sedimentation device including an oil-water separator inlet, a filter water inlet, a first outlet and a second outlet, the oil-water separator inlet being connected to the oil-water separator outlet, the filter water inlet being connected to the filter water outlet, and adapted to remove LAS from the oil-water separator and the filter water to obtain LAS-removed water;

[0015] A filtration and decolorization device, comprising an inlet and a filtered and decolorized water outlet, wherein the inlet is connected to the first outlet and is adapted to filter and decolorize the LAS-removed water to obtain filtered and decolorized water;

[0016] The UV disinfection device includes a filtered and decolorized water inlet and a disinfected water outlet. The filtered and decolorized water inlet is connected to the filtered and decolorized water outlet and is suitable for performing UV disinfection treatment on the filtered and decolorized water to obtain disinfected water.

[0017] A storage device includes a disinfected water inlet and an outlet. The disinfected water inlet is connected to the disinfected water outlet, and the outlet is connected to the toilet flushing outlet. The storage device is adapted to store the disinfected water and supply the disinfected water to the toilet as flushing water.

[0018] The three-compartment septic tank includes a first compartment, a second compartment, and a third compartment connected to each other. The first compartment includes a black water inlet for flushing toilets, and the third compartment includes a mixed water outlet. A second outlet is connected to the third compartment and is adapted to supply the black water for flushing toilets to the first compartment, and then mix it with the LAS-removed water in the second compartment to obtain mixed water.

[0019] An ecological infiltration 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 infiltration treatment of the mixed water to obtain harmless water.

[0020] This invention addresses the water quality characteristics of greywater, which has relatively low pollutant content and is easier to treat, and blackwater, which has high concentration and requires pretreatment. It separates greywater and blackwater for different treatments. A portion of the greywater, after coagulation and sedimentation to remove LAS (Laminated Sodium Alcohol), is filtered, decolorized, and UV-disinfected before being used as toilet flushing water. This simple purification of greywater, ensuring it doesn't affect cleaning effectiveness, harm human health, or cause discomfort, allows it to be reused for toilet flushing, replacing conventional flushing water and conserving water resources. The remaining LAS-removed water from the coagulation and sedimentation stage, along with the blackwater from toilet flushing, is supplied to a three-compartment septic tank for co-treatment. This reduces the pollutant concentration in the blackwater, adjusts the carbon-to-nitrogen ratio, and improves treatment efficiency. Finally, the treated mixed water is supplied to an ecological infiltration device for further purification, and the effluent can be used in farmland. When there is no need for further use, it meets discharge standards. Therefore, this invention's system can effectively utilize water resources by separating greywater and blackwater based on their specific characteristics, achieving low-cost and high-efficiency treatment of greywater in rural households. This is significant for solving the current problem of combined toilet waste management in Chinese rural areas and improving water resource utilization.

[0021] In addition, the resource-recycling black and gray water treatment system according to the above embodiments 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 settling tank. The coagulation tank includes the oil-water separator inlet, the filtered ash water inlet, the coagulant, the overflow outlet, and the agitator. The settling tank includes a post-coagulation water inlet, a mud-water separator, a first outlet, and a second outlet. In the height direction of the settling tank, the first outlet is located above the second outlet, the second outlet is located above the mud-water separator, the mud-water separator is located above the post-coagulation water inlet, and the post-coagulation water inlet is connected to the overflow outlet.

[0023] In some embodiments of the present invention, the storage device is further provided with a water level monitoring component, the sedimentation tank is provided with a control component, the control component is connected to the water level monitoring component, and the control component controls the opening degree of the first outlet and the second outlet based on the feedback of the water level monitoring 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 component 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 to 1 / 3 of the height of the storage device.

[0025] In some embodiments of the present invention, the filtration and decolorization 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, and the first zone and the second zone are connected below the first partition. A second partition is provided between the second zone and the third zone, and the second zone and the third zone are connected above the second partition. The first zone includes a first packing zone, which includes inorganic packing. The water inlet is located in the first zone and above the first packing zone in the height direction of the first zone. The second zone includes a second packing zone, which includes a mixed packing of biochar and activated carbon. The third zone includes a third packing zone, which includes modified activated carbon. The third zone includes a filtered and decolorized water outlet, which is located above the third packing zone in the height direction of the third 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 biochar to activated carbon in the mixed packing is 3-10:1.

[0029] In some embodiments of the present invention, the specific surface area of ​​the biochar is 80-450 m². 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 m². 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 cell, the second cell, and the third cell is 2:1:(3-6).

[0035] In some embodiments of the present invention, the ecological infiltration device comprises, from top to bottom: an inlet layer, the inlet layer including a water distribution component, the mixed water inlet being disposed on the water distribution component and the water distribution component having a water distribution port; a water distribution layer, the water distribution layer including inorganic material particles; a first treatment layer, the first treatment layer including soil, biochar, zeolite and volcanic rock; a second treatment layer, the second treatment layer including zero-valent iron micro-electrolysis iron-carbon filler; a third treatment layer, the third treatment layer including soil, zeolite and fly ash; and an outlet layer, the outlet layer including a collection component, the collection component having a collection port and the harmless water outlet, the collection port being 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 ceramic sand, maifanite, 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 processing layer is 300-400 mm.

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

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

[0044] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

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

[0046] Figure 1 This is a schematic diagram of a resource-recycling black and gray water treatment system according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the structure of a coagulation and sedimentation device in a resource-recycling black and gray water treatment system according to an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the structure of a filtration and decolorization device in a resource-recycling black and gray water treatment system according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of a UV disinfection device in a resource-recycling black and gray water treatment system according to an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of a storage device in a resource-recycling black and gray water treatment system according to an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the structure of an ecological infiltration device in a resource-recycling black and gray water treatment system according to an embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100 - Grease trap; 101 - Kitchen grease inlet; 102 - Grease outlet; 103 - Grease and grease outlet;

[0054] 200 - Filtration device; 201 - Bathing and laundry greywater inlet; 202 - Debris outlet; 203 - Filtered greywater outlet;

[0055] 300 - Grey water treatment unit; 31 - Coagulation and sedimentation device; 311 - Oil-water separator inlet; 312 - Filtered grey water inlet; 313 - First outlet; 314 - Second outlet; 315 - Coagulation tank; 316 - Settling tank; 317 - Overflow outlet; 318 - Agitator; 319 - Post-coagulation water inlet; 320 - Sludge-water separator; 32 - Filtration and decolorization device; 321 - Inlet; 322 - Post-filtration and decolorization water outlet; 323 - First zone; 324 - Second zone; 32 5-Third zone; 326-First partition; 327-Second partition; 328-First packing zone; 329-Second packing zone; 330-Third packing zone; 33-UV disinfection device; 331-Water inlet after filtration and decolorization; 332-Water outlet after disinfection; 333-Low-pressure high-intensity UV lamp; 34-Storage device; 341-Water inlet after disinfection; 342-Outlet; 343-Flushing outlet; 35-Water level monitoring component; 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; 402 - Mixed water outlet;

[0057] 500 - Ecological infiltration device; 501 - Mixed water inlet; 502 - Harmless water outlet; 51 - Inlet layer; 511 - Water distribution component; 503 - Water distribution port; 52 - Water distribution layer; 53 - First treatment layer; 54 - Second treatment layer; 55 - Third treatment layer; 56 - Outlet layer; 561 - Collection component; 504 - Collection port. Detailed Implementation

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

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In one aspect of the invention, a resource-recycling black and grey water treatment system is proposed. According to an embodiment of the invention, reference is made to... Figure 1 The treatment system includes an oil separator 100, a filter 200, a greywater treatment unit 300, a three-compartment septic tank 400, and an ecological infiltration device 500.

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

[0064] According to a specific embodiment of the present invention, kitchen ash water generally has a high oil content and can be collected separately and supplied to an oil separator 100 to remove grease and other contaminants. The oil separator 100 can be square or circular, with a side length (diameter) of 250mm-500mm. It should be noted that the oil separator 100 can be any device in the prior art that can achieve oil-water separation, and those skilled in the art can select it according to actual needs, which will not be elaborated here.

[0065] According to an embodiment of the present invention, reference Figure 1 The filtration device 200 includes a bathing and laundry greywater inlet 201, a debris outlet 202, and a filtered greywater outlet 203, and is adapted to filter bathing and laundry greywater to obtain filtered greywater and debris including hair.

[0066] Specifically, the wastewater from bathing and laundry is collected through pipes and enters the filtration device 200 to filter out hair and other debris, preventing clogging of subsequent treatment facilities. The filter screen in the filtration device 200 can have a pore size of 0.5-5mm.

[0067] According to an embodiment of the present invention, reference Figure 1 and 2 The greywater treatment unit 300 includes a coagulation 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, reference is made to Figure 1 and 2 The coagulation and sedimentation device 31 contains a coagulant (not shown). The device includes an oil-water separator inlet 311, a filtered water inlet 312, a first outlet 313, and a second outlet 314. The oil-water separator inlet 311 is connected to the oil-water separator outlet 103, and the filtered water inlet 312 is connected to the filtered water outlet 203. It is adapted to remove LAS from the oil-water separator and filtered water, obtaining LAS-free water. Specifically, because LAS (anionic surfactant) in grey water has characteristics such as penetration, emulsification, and foaming, it reduces the water's cleaning power and flushing efficiency during toilet flushing due to foaming and emulsification. It also easily coats fecal matter, causing bacteria to grow in the toilet's water trap. This application uses the coagulation and sedimentation device 31 to remove LAS from grey water, which reduces foaming and emulsification, improves flushing efficiency, and reduces bacterial growth.

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

[0070] According to a specific embodiment of the present invention, reference is made to Figure 2The coagulation and sedimentation device 31 includes a coagulation tank 315 and a settling tank 316. The coagulation tank 315 includes an oil-water separator inlet 311, a filtered ash water inlet 312, a coagulant, an overflow outlet 317, and a stirrer 318. The settling tank 316 includes a post-coagulation water inlet 319, a mud-water separator 320, a first outlet 313, and a second outlet 314. In the height direction of the settling tank 316, the first outlet 313 is located above the second outlet 314, and the second outlet 314 is located above the mud-water separator 320. The mud-water separator 320 is located above the coagulation water inlet 319, and the coagulation water inlet 319 is connected to the overflow port 317. The oil-water separated by the oil separator 100 and the filtered water obtained by the filter 200 are supplied to the coagulation tank 315 to be mixed with the coagulant for coagulation treatment to remove LAS from the oil-water separated water and the filtered water. The coagulated water overflows through the overflow port 317 and enters the settling tank 316 through the coagulation water inlet 319. After passing through the mud-water separator 320, the water after LAS removal is obtained.

[0071] According to an embodiment of the present invention, reference Figure 1 and 3 The filtration and decolorization device 32 includes an inlet 321 and a filtered and decolorized water outlet 322. The inlet 321 is connected to the first outlet 313 and is adapted to filter and decolorize the LAS-removed water to obtain filtered and decolorized water.

[0072] According to a specific embodiment of the present invention, reference is made to Figure 3The filtration and decolorization 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, and the first zone 323 and the second zone 324 are connected below the first partition 326. A second partition 327 is provided between the second zone 324 and the third zone 325, and the second zone 324 and the third zone 325 are connected above the second partition 327. The first zone 323 includes a first packing zone 328, which includes inorganic packing. The inlet 321 is located in the first zone 323 and in the height direction of the first zone 323, above the first packing zone 328. The second zone 324 includes a second packing zone 329, which includes a mixed packing of biochar and activated carbon. Zone 325 includes a third packing zone 330, which contains modified activated carbon. Zone 325 also includes a filtered and decolorized water outlet 322. In the height direction of Zone 325, the filtered and decolorized water outlet 322 is located above the third packing zone 330. The water after LAS removal is supplied to Zone 323 through inlet 321. It undergoes initial filtration and decolorization through the inorganic packing in Zone 328 of Zone 323. The water separated by Zone 328 enters Zone 324 below the first baffle 326. It undergoes secondary filtration and decolorization through the mixed packing in Zone 329 of Zone 324. The water separated by Zone 329 overflows above the second baffle 327 into Zone 324 for deep decolorization, resulting in filtered and decolorized water.

[0073] Further, 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 biochar to activated carbon in the mixed filler is 3-10:1; the biochar may include straw charcoal, rice husk (walnut shell, peanut shell) charcoal, bamboo charcoal, etc., and the specific surface area of ​​the biochar is 80-450 m². 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, oxidants such as nitric acid and hydrogen peroxide can be selected to modify the activated carbon, adjust the functional groups on the surface of the activated carbon, increase oxygen-containing groups (-COOH, -OH, etc.), enhance hydrophilicity, and improve the adsorption effect; the specific surface area of ​​the modified activated carbon is 500-1200m². 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 with oxidants such as nitric acid and hydrogen peroxide is a conventional operation in the field and will not be described in detail here. At the same time, the first packing zone 328, the second packing zone 329 and the third packing zone 330 are all formed by using mesh bags to fill the packing, which is conducive to quick replacement.

[0075] According to a specific embodiment of the present invention, reference is made to 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 UV disinfection treatment of the filtered and decolorized water to obtain disinfected water. Specifically, the UV disinfection device 33 is equipped with 1-4 low-pressure high-intensity UV lamps 333, with a UV dose of 30-160 mJ / cm2, and the residence time in the UV disinfection device 33 is greater than 10 seconds, killing pathogenic microorganisms such as fecal coliforms in the filtered and decolorized water and reducing the health threat of toilet flushing water.

[0076] According to a specific embodiment of the present invention, reference is made to Figure 1 and 5 The storage device 34 includes a disinfected water inlet 341 and an outlet 342. The disinfected water inlet 341 is connected to the disinfected water outlet 332, and the outlet 342 is connected to the toilet flush outlet 343. It is suitable for storing disinfected water and supplying it to the toilet as flushing water. Thus, greywater can be simply purified and reused for toilet flushing without affecting cleaning effectiveness, harming human health, or providing sensory comfort, replacing conventional toilet flushing water and saving water resources.

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

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

[0079] Specifically, the first two compartments (41 and 42) of the three-compartment septic tank 400 are anaerobic biological reactors, suitable for treating high-concentration wastewater. Therefore, supplying the black water from toilet flushing to the first two compartments (31 and 42) for treatment, and then mixing it with low-concentration grey water (i.e., water after LAS removal) in the third compartment (43), can improve the treatment efficiency of the first two compartments (41 and 42). At the same time, during the mixing process in the third compartment (43), the third compartment (43) can be used as a water quality conditioning tank to fully mix the black water and grey water, diluting the concentration of pollutants such as COD, N, and P in the black water, which is beneficial to improving the efficiency of subsequent ecological treatment. In addition, the black water from toilet flushing has a high nitrogen and phosphorus content and a low COD / TN ratio, resulting in poor biodegradability, while the grey water has a high COD / TN ratio. Mixing them helps to adjust the COD / TN ratio and improve the biodegradability of the wastewater.

[0080] According to a specific embodiment of the present invention, the effective volume of the three-compartment septic tank 400 is greater than 2m³. 3 Furthermore, 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 thorough mixing and storage of black water and grey water. Moreover, 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 conventional three-compartment septic tank structure used in the field. Those skilled in the art can select the relevant bacteria species in the first compartment 41, the second compartment 42 and the third compartment 43 according to actual needs, which will not be elaborated here.

[0082] According to a specific embodiment of the present invention, reference is made to Figure 5 The storage device 34 is also equipped with a water level monitoring component 35, and the sedimentation tank 315 is equipped with a control component (not shown). The control component is connected to the water level monitoring component 35. Based on the feedback from the water level detection component 35, the control component controls the opening degree of the first outlet 313 and the second outlet 314. For example, by setting electric valves at the first outlet 313 and the second outlet 314, the control component controls the opening degree of the first outlet 313 and the second outlet 314 based on the feedback from the water level detection component 35, that is, adjusts the supply of water after LAS removal to the filtration and decolorization device 32 and the third compartment 43 of the three septic tanks 400.

[0083] Further, refer to Figure 5The 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 outlet 342, and the distance between the second liquid level sensor 352 and the bottom of the storage device 34 is 1 / 4 to 1 / 3 of the height of the storage device 34. Specifically, when the water level in the storage device 34 is high (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 outlet 313 and the opening of the second outlet 314. At this time, the LAS-removed water obtained by the coagulation sedimentation device 31 flows through the second outlet 314 to the third compartment 43 of the three-compartment septic tank 400. When the water level in the storage device 34 is low (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 outlet 313 and the closing of the second outlet 314. At this time, the LAS-removed water obtained by the coagulation sedimentation device 31 flows through the second outlet 314 to the third compartment 43 of the three-compartment septic tank 400. After the LAS removal process, the water flows through the first outlet 313 to the filtration and decolorization device 32 for treatment, and finally flows to the storage tank to replenish the toilet flushing water. When the water level in the storage device 34 is between the first level sensor 351 and the second level sensor 352, the control component controls the simultaneous opening of the first outlet 313 and the second outlet 314. At this time, part of the water obtained by the coagulation and sedimentation device 31 after LAS removal flows through the first outlet 313 to the filtration and decolorization device 32 for treatment, and the other part flows through the second 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, reference 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, reference is made to Figure 6The ecological infiltration device 500 includes, from top to bottom, an inlet layer 51, a distribution layer 52, a first treatment layer 53, a second treatment layer 54, a third treatment layer 55, and an outlet layer 56. The inlet layer includes a distribution assembly 511, with a mixed water inlet 501 located on the distribution assembly 511 and a distribution port 503 on the distribution assembly 511. The distribution layer 52 comprises inorganic material particles, distributing the treated mixed water from the third compartment 43 of the three septic tanks 400 and trapping larger impurities. The first treatment layer 53 comprises soil, biochar, zeolite, and volcanic rock. Water passing through the distribution layer 52 undergoes primarily biochemical and physicochemical reactions in the first treatment layer 53, removing pollutants such as COD, nitrogen, and phosphorus from the black and grey water. Because the first treatment layer 53 is close to the inlet layer, aerobic and... The first treatment layer 53 includes an anaerobic reaction; the second treatment layer 54 includes zero-valent iron micro-electrolysis iron-carbon filler, which further removes pollutants from the water after treatment by the first treatment layer 52. This zero-valent iron micro-electrolysis iron-carbon filler can form numerous micro-battery systems, enhancing the removal efficiency of pollutants, especially improving the treatment efficiency of phosphorus; the third treatment layer 55 includes soil, zeolite and fly ash, which mainly undergo anaerobic and facultative reactions, further removing pollutants from the water after treatment by the second treatment layer 53; the effluent layer 56 includes a collection component 561, which 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 in the collection component 561 through multiple collection ports 504 and discharged into the collection component 561 for effluent utilization or in compliance with standards.

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

[0087] Further, the thickness of the water distribution layer is 150-200 mm, and the inorganic material particles in the water distribution layer 52 may include one or more of ceramic sand, maifanite, and gravel, with a volume average particle size of 20-50 mm; the thickness of the first treatment layer is 300-400 mm, and 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, and 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-recycling black and gray water treatment system of the present invention can be a miniaturized box-type device, which is convenient for installation, commissioning and operation and maintenance management.

[0089] This invention addresses the water quality characteristics of greywater, which has relatively low pollutant content and is easier to treat, and blackwater, which has high concentration and requires pretreatment. It separates greywater and blackwater for different treatments. A portion of the greywater, after coagulation and sedimentation to remove LAS (Laminated Sodium Alcohol), is filtered, decolorized, and UV-disinfected before being used as toilet flushing water. This simple purification of greywater, ensuring it doesn't affect cleaning effectiveness, harm human health, or cause discomfort, allows it to be reused for toilet flushing, replacing conventional flushing water and conserving water resources. The remaining LAS-removed water from the coagulation and sedimentation stage, along with the blackwater from toilet flushing, is supplied to a three-compartment septic tank for co-treatment. This reduces the pollutant concentration in the blackwater, adjusts the carbon-to-nitrogen ratio, and improves treatment efficiency. Finally, the treated mixed water is supplied to an ecological infiltration device for further purification, and the effluent can be used in farmland. When there is no need for further use, it meets discharge standards. Therefore, this invention's system can effectively utilize water resources by separating greywater and blackwater based on their specific characteristics, achieving low-cost and high-efficiency treatment of greywater in rural households. This is significant for solving the current problem of combined toilet waste management in Chinese rural areas and improving water resource utilization.

[0090] The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0091] Example 1

[0092] Table 1 shows the water quality of black water used for flushing toilets, grey water used for cooking, and grey water used for bathing and laundry in rural households. (Reference) Figure 1-6 Kitchen grease enters a square grease trap (350mm side length) to remove grease and other contaminants, resulting in grease-separated grease water. Washing and laundry grease then enters a filter (1.5mm mesh size) to remove impurities, including hair, resulting in filtered grease water. Both the grease-separated and filtered grease water are supplied to the coagulation tank of the grease treatment unit. The coagulation tank uses polymeric cationic modified starch as a coagulant. After coagulation, the grease water enters a settling tank to remove LAS (Laminated Alkali) and other contaminants, resulting in LAS-removed water. A portion of this LAS-removed water is then supplied to the first zone of the filtration and decolorization unit. In the first packing zone, the inorganic packing material consists of waste straw and gravel, with a volume average particle size (Dv50) of 15mm. In the second packing zone, the packing material is a mixture of biochar and activated carbon, with the biochar being rice husk charcoal and having a specific surface area of ​​137m². 2 / g, the mixing ratio of biochar and activated carbon is 5:1, the volume 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 ​​830m². 2 / g, with a volume average particle size Dv50 of 6mm, water after LAS removal is treated in the first, second, and third zones of a filtration and decolorization device to obtain filtered and decolorized water. This filtered and decolorized water is then supplied to a UV disinfection device equipped with two low-pressure, high-intensity UV lamps, a UV dose of 50mJ / cm², and a residence time greater than 30s, resulting in disinfected water. This disinfected water is then stored in a storage device for use as toilet flushing water. The black water from farmers' toilet flushing enters a three-compartment septic tank with an effective volume of 2.5m³. 3 The volume ratio of the first, second, and third septic tanks is 2:1:4. The black wastewater from flushing the toilet passes through the first, second, and third septic tanks sequentially. Simultaneously, a portion of the water obtained from the coagulation and sedimentation device (excluding LAS) is supplied to the third septic tank, where it mixes with the black ash and ferments. The resulting mixed water then enters the ecological infiltration device, passing sequentially through the inlet layer, the distribution layer (150mm high, containing a mixture of ceramic sand, ceramsite, and maifanite particles with an average volumetric particle size Dv5035mm), and the first treatment layer (300mm high). The system comprises a first treatment layer (100mm high, filled with ferrous micro-electrolytic iron-carbon filler), a second treatment layer (350mm high, filled with a mixture of soil, zeolite, and fly ash, comprising 65% soil, 20% zeolite, and the remainder fly ash), and an effluent layer. The treated water, after passing through the ecological infiltration device, meets discharge standards. The average water quality values ​​of the toilet flushing water stored in the storage device and the effluent from the ecological infiltration device are shown in Table 1.

[0093] Table 1. Water quality indicators of influent and effluent

[0094]

[0095]

[0096] Example 2

[0097] Table 2 shows the water quality of black water used for flushing toilets, grey water used for cooking, and grey water used for bathing and laundry in rural households. (Reference) Figure 1-6Kitchen grease enters a square grease trap (500mm side length) to remove grease and other contaminants, resulting in grease-separated grease water. Washing and laundry grease then enters a filter (3.5mm mesh size) to remove impurities, including hair, resulting in filtered grease water. Both the grease-separated and filtered grease water are supplied to the coagulation tank of the grease treatment unit. The coagulation tank uses a cationic grafted cellulose-based coagulant. After coagulation, the grease water enters a settling tank to remove LAS (Laminated Alkali) and other contaminants, resulting in LAS-removed water. A portion of this LAS-removed water is then supplied to the first zone of the filtration and decolorization unit. In the first packing zone, the inorganic packing material consists of construction waste and gravel, with a volume average particle size (Dv50) of 18mm. In the second packing zone, the packing material is a mixture of biochar and activated carbon, with the biochar being straw charcoal and having a specific surface area of ​​187m². 2 / g, the mixing ratio of biochar and activated carbon is 6:1, the volume 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 ​​593m². 2 / g, with a volume average particle size (Dv50) of 6mm, after LAS removal, the water is treated in the first, second, and third zones of a filtration and decolorization device to obtain filtered and decolorized water. This filtered and decolorized water is then supplied to a UV disinfection device equipped with three low-pressure, high-intensity UV lamps, a UV dose of 120mJ / cm², and a residence time of 20s, yielding disinfected water. This disinfected water is then stored in a storage device for use as toilet flushing water. The black wastewater from farmers' toilet flushing enters a three-compartment septic tank with an effective volume of 4m³. 3The volume ratio of the first, second, and third septic tanks is 2:1:5. The black wastewater from flushing the toilet passes through the first, second, and third septic tanks sequentially. Simultaneously, a portion of the water obtained from the coagulation and sedimentation device (excluding LAS) is supplied to the third septic tank, where it mixes with the black ash and ferments. The resulting mixed water then enters the ecological infiltration device, passing sequentially through the inlet layer, the distribution layer (180mm high, containing inorganic material particles of maifanite and gravel with an average volumetric particle size Dv5030mm), and the first treatment layer (400mm high). The system comprises a packing material consisting of a mixture of soil, biochar, zeolite, and volcanic rock (60% by mass, 20% by mass, and 10% each by mass of zeolite and biochar), a second treatment layer (50mm high, filled with ferric micro-electrolysis iron-carbon packing material), a third treatment layer (400mm high, filled with a mixture of soil, zeolite, and fly ash, 47% by mass, 25% by mass of zeolite, and the remainder being fly ash), and an effluent layer. The treated water, harmless as a result of the ecological infiltration device, meets discharge standards. The average water quality values ​​of the toilet flushing water stored in the storage device and the effluent from the ecological infiltration device are shown in Table 2.

[0098] Table 2. Water Quality Indicators of Influent and Effluent

[0099]

[0100] Example 3

[0101] Table 3 shows the water quality of black water used for flushing toilets, grey water used for cooking, and grey water used for bathing and laundry in rural households. (Reference) Figure 1-6 Kitchen grease enters a square grease trap (400mm side length) to remove grease and other contaminants, resulting in grease-separated grease water. Washing and laundry grease then enters a filtration device (0.5mm mesh size) to remove impurities, including hair, resulting in filtered grease water. Both the grease-separated and filtered grease water are supplied to the coagulation tank of the grease treatment unit. The coagulation tank uses a mixture of cationic grafted cellulose-based coagulant and chitosan in a 2:1 mass ratio as the coagulant. After coagulation in the coagulation tank, the grease water enters a settling tank for sedimentation to remove LAS and other contaminants, resulting in LAS-removed water. A portion of this LAS-removed water is then supplied to the first zone of the filtration and decolorization unit. In the first packing zone, the inorganic packing material consists of waste straw, construction waste, and gravel, with a volumetric average particle size (Dv50) of 8mm. In the second packing zone, the packing material is a mixture of biochar and activated carbon, with the biochar being bamboo charcoal and having a specific surface area of ​​420m². 2 / g, the mixing ratio of biochar and activated carbon is 3:1, the volume average particle size Dv50 of the mixed packing is 4mm, and the packing in the third zone is nitric acid-modified activated carbon with a specific surface area of ​​720m². 2 / g, with a volume average particle size Dv50 of 5mm, water after LAS removal is treated in the first, second, and third zones of a filtration and decolorization device to obtain filtered and decolorized water. This filtered and decolorized water is then supplied to a UV disinfection device equipped with one low-pressure, high-intensity UV lamp, a UV dose of 40mJ / cm², and a residence time of 40s, yielding disinfected water. This disinfected water is then stored in a storage device for use as toilet flushing water. The black water from farmers' toilet flushing enters a three-compartment septic tank with an effective volume of 5m³. 3 The volume ratio of the first, second, and third septic tanks is 2:1:4. The black wastewater from flushing toilets passes through the first, second, and third septic tanks sequentially. Simultaneously, a portion of the water obtained from the coagulation and sedimentation device (excluding LAS) is supplied to the third septic tank, where it mixes with the black ash and ferments. The resulting mixed water then enters the ecological infiltration device, passing sequentially through the inlet layer, the distribution layer (200mm high, containing ceramic granules with an average volumetric particle size Dv5026mm), and the first treatment layer (300mm high, containing packing material). The system consists of: a first treatment layer (50mm high, filled with ferrous micro-electrolytic iron-carbon filler); a second treatment layer (400mm high, filled with a mixture of soil, zeolite, and fly ash, with soil comprising 50%, zeolite 30%, and the remainder fly ash); and an effluent layer. The treated water, harmless and compliant with discharge standards, is stored in the ecological infiltration device. The average water quality values ​​of the toilet flushing water stored in the storage device and the effluent from the ecological infiltration device are shown in Table 3.

[0102] Table 3. Water Quality Indicators of Influent and Effluent

[0103]

[0104]

[0105] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A resource-recycling type black and gray water treatment system, characterized in that, include: An oil separator, comprising a kitchen ash water inlet, an grease outlet, and an oil-separated ash water outlet, and adapted to perform oil separation treatment on kitchen ash water to obtain grease and oil-separated ash water; A filtration device, comprising a bathing and laundry greywater inlet, a debris outlet, and a filtered greywater outlet, and adapted to filter bathing and laundry greywater to obtain filtered greywater and debris including hair; Grey water treatment unit, the grey water treatment unit comprising: A coagulation and sedimentation device containing a coagulant, comprising an oil-water separator inlet, a filtered ash water inlet, a first outlet, and a second outlet, wherein the oil-water separator inlet is connected to the oil-water separator outlet, and the filtered ash water inlet is connected to the filtered ash water outlet, and is adapted to remove the anionic surfactant LAS from the oil-water separator and the filtered ash water to obtain water after removing the anionic surfactant LAS; A filtration and decolorization device, comprising an inlet and a filtered and decolorized water outlet, wherein the inlet is connected to the first outlet and is adapted to filter and decolorize the water after removing the anionic surfactant LAS to obtain filtered and decolorized water; The UV disinfection device includes a filtered and decolorized water inlet and a disinfected water outlet. The filtered and decolorized water inlet is connected to the filtered and decolorized water outlet and is suitable for performing UV disinfection treatment on the filtered and decolorized water to obtain disinfected water. A storage device includes a disinfected water inlet and an outlet. The disinfected water inlet is connected to the disinfected water outlet, and the outlet is connected to the toilet flushing outlet. The storage device is adapted to store the disinfected water and supply the disinfected water to the toilet as flushing water. A three-compartment septic tank includes three interconnected compartments: a first compartment, a second compartment, and a third compartment. The first compartment includes a black water inlet for flushing, and the third compartment includes a mixed water outlet. A second outlet is connected to the third compartment and is adapted to supply black water for flushing to the first compartment, where it is then mixed with LAS-treated water in the second compartment to obtain mixed water. An ecological infiltration device includes a mixed water inlet and a harmless water outlet. The mixed water inlet is connected to the mixed water outlet and is adapted to infiltrate the mixed water to obtain harmless water. The coagulation and sedimentation device includes a coagulation tank and a settling tank. The coagulation tank includes an oil-water separator inlet, a filtered ash water inlet, a coagulant, an overflow outlet, and a stirrer. The settling tank includes a post-coagulation water inlet, a mud-water separator, a first outlet, and a second outlet. In the height direction of the settling tank, the first outlet is located above the second outlet, the second outlet is located above the mud-water separator, the mud-water separator is located above the post-coagulation water inlet, and the post-coagulation water inlet is connected to the overflow outlet.

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

3. The system according to claim 2, characterized in that, The water outlet is located at the upper end of the storage device. The water level monitoring component 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 to 1 / 3 of the height of the storage device.

4. The system according to claim 3, characterized in that, The filtration and decolorization 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, and the first zone and the second zone are connected below the first partition. A second partition is provided between the second zone and the third zone, and the second zone and the third zone are connected above the second partition. The first zone includes a first packing zone, which includes inorganic packing. The water inlet is located in the first zone and above the first packing zone in the height direction of the first zone. The second zone includes a second packing zone, which includes a mixed packing of biochar and activated carbon. The third zone includes a third packing zone, which includes modified activated carbon. The third zone includes a filtered and decolorized water outlet, which is located above the third packing zone in the height direction of the third zone. The inorganic filler includes one or more of straw, construction waste, gravel, and sand. The volume average particle size Dv50 of the inorganic filler is 8-20 mm; The mass ratio of biochar to activated carbon in the mixed packing is 3-10:1; The specific surface area of ​​the biochar is 80-450 m². 2 / g; The volume average particle size Dv50 of the mixed filler is 3-8 mm; The modified activated carbon has oxygen-containing groups; The modified activated carbon has a specific surface area of ​​500-1200 m². 2 / g; The volume average particle size Dv50 of the modified activated carbon is 3-8 mm.

5. The system according to claim 1, characterized in that, The volume ratio of the first cell, the second cell, and the third cell is 2:1:(3-6).

6. The system according to claim 1 or 4, characterized in that, The ecological infiltration device comprises, from top to bottom: The water inlet layer includes a water distribution assembly, wherein the mixed water inlet is disposed on the water distribution assembly and the water distribution assembly is provided with a water distribution port; A water distribution layer, wherein the water distribution layer comprises inorganic material particles; The first treatment layer comprises soil, biochar, zeolite, and volcanic rock; The second processing layer includes zero-valent iron micro-electrolytic iron-carbon filler. The third treatment layer includes soil, zeolite, and fly ash. The water outlet layer includes a collection component, which has a collection port and a harmless water outlet, and the collection port is connected to the third treatment layer.

7. The system according to claim 6, characterized in that, 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.

8. The system according to claim 6, characterized in that, 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.

9. The system according to claim 6, characterized in that, One or more of the following conditions must be met: The thickness of the water distribution layer is 150-200 mm; The inorganic material particles include one or more of ceramic sand, maifanite, and gravel. The volume average particle size Dv50 of the inorganic material particles is 20-50 mm; The thickness of the first processing layer is 300-400 mm; The thickness of the second processing layer is 50-150 mm; The thickness of the third processing layer is 300-400 mm.

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