Separation device for dairy cow dung water, separation device forming method and treatment method

Abstract

The invention discloses a separation device for dairy cow dung water, a separation device forming method and a treatment method. The separation device comprises a desilting basin, a permeation basin, a grating, a separation layer forming area and a funnel-shaped multi-layer biomass permeation separation layer, a separation layer forming area is formed in the permeation tank under the supporting action of the supporting net, the biomass interlayer and the large-particle hard interlayer, a funnel-shaped multi-layer biomass permeation separation layer is formed in the separation layer forming area, and the funnel-shaped multi-layer biomass permeation separation layer comprises a separation layer surface layer, a separation layer bottom layer and a separation layer middle layer; the surface layer of the separation layer is used for intercepting solid matters and salt and producing acid, the bottom layer of the separation layer plays a supporting role, and the middle layer of the separation layer is used for permeating liquid dung and intercepting the solid matters. By adopting the separation device disclosed by the invention, cow dung water solids after mechanical solid-liquid separation can be efficiently intercepted on a large scale without adding exogenous substances, and salt can be effectively intercepted to reduce nitrogen element loss, so that the economic cost of dung water treatment is reduced, and nutrients are efficiently recovered.

Description

Technical Field

[0001] The present invention relates to a separation device for cow manure wastewater, a method for forming the separation device, and a treatment method, belonging to the technical field of safe treatment and field application of breeding wastewater. Background Art

[0002] With the rapid development of the dairy farming industry, its scale has been continuously expanding, and the generation amount of cow manure wastewater has also been increasing day by day. Cow manure wastewater has the following characteristics: 1) It contains a large amount of organic substances, such as feces and urine. After these organic substances are mixed into the wastewater, it will lead to a high organic load of the manure wastewater and difficult treatment; 2) This type of manure wastewater has a high fiber content and a large amount of animal hair. Incomplete mechanical solid-liquid separation makes it difficult to remove, which is not conducive to its pipeline transportation and application, and is also a major problem in subsequent treatment; 3) Cow manure wastewater has a high salt content, and most of the salts are rich in colloidal suspended solids, which are difficult to separate by mechanical separation methods; 4) Urea in cow urine decomposes to produce ammonia, which is likely to cause ammonia volatilization and nitrogen loss. Effectively removing the solids in the manure wastewater and the salts carried by them, with a focus on the colloidal suspended solids that are difficult to separate by mechanical separation, and effectively retaining the nitrogen in the liquid, is the key to the efficient field application of manure wastewater. On the one hand, the solid separation rate is only about 40-50%, and there are still a large amount of solids and suspended substances that cannot be removed. This not only causes the nitrogen in the solids to be unable to be effectively recycled, but also results in a large amount of nitrogen loss in subsequent treatment. On the other hand, for the wastewater with incomplete solid separation, the liquid fertilizer carried in the wastewater is also high, the organic load is also large, the difficulty of subsequent composting treatment is also great, and the nitrogen element loss during the treatment process is also high, which is not conducive to the field application of the fertilizer solution.

[0003] Existing solid - matter removal methods for dairy manure wastewater after mechanical separation include biological treatment, chemical treatment, physical precipitation and other measures. 1) Biological treatment can achieve the degradation of solid matter, but it also releases salts into the manure wastewater and nitrogen into the air; 2) Chemical treatment methods may introduce chemical agent residues, causing secondary pollution to the environment, and the subsequent utilization value of the treated products is reduced. Returning them to the field will bring a large amount of chemicals into the farmland; 3) Using physical precipitation methods, such as the pig farm manure sewage treatment method based on thick - thin flow diversion (patent number ZL2009100584721), mainly through different functional zones, using gravity and flotation to make the materials naturally stratify. This method lacks the adsorption effect on nitrogen, suspended solids, etc., and during the implementation process, there are also problems such as excessive feeding, causing disturbances that break the physical sedimentation stratification and poor separation effect; in addition, the natural sedimentation process requires long - term residence, resulting in a large loss of nutrients such as nitrogen; 4) There are also many solutions that use porous media such as adding bio - carbon, biomass materials, crop straws for physical adsorption, such as: CN202410542927.1, but these methods all involve the addition of a large amount of organic matter and often have problems such as blockage, and cannot form an effective filtration result with the biomass, resulting in poor solid - liquid separation effect. There is also a structure using straw bales as permeable filtration materials, but after the manure wastewater enters, the filtration materials will collapse, and the mud - like particulate matter will block the surface of the filtration material structure, unable to form an effective filtration structure, and finally the manure wastewater will flow away from other places, with poor permeation effect.

[0004] In summary, existing manure solid - liquid separation solutions mostly use materials such as bio - carbon for flocculation or mixing to make the structure of suspended solids convenient for subsequent separation, or use porous media such as straw for physical adsorption. These solutions can only be treated once. When the function of the additive is lost, new materials need to be replaced. If there are slightly other large - particle substances or sediment - like substances, it will cause a substantial increase in the dosage of the additive or a substantial attenuation of the solid - liquid separation effect; in addition, these solutions will also produce a large amount of separated substances, which need further treatment later. This makes the existing solutions generally have many deficiencies: large input of additive materials, high treatment costs, especially during the process of replacing separation materials, the operation is complex, the stability and reliability of the system are poor, large loss of solid matter, and low feasibility for large - scale application. Summary of the Invention

[0005] The object of the present invention is to overcome the above problems existing in the prior art, and provide a separation device for cow manure water, a method for forming the separation device, and a treatment method. By using the separation device of the present invention, it is possible to efficiently intercept a large amount of solid substances in cow manure water after mechanical solid-liquid separation without adding external substances, effectively intercept salts, reduce nitrogen element loss, realize the reduction of the economic cost of manure water treatment and the efficient recovery of nutrients; and directly form organic fertilizer products after treatment, without subsequent waste treatment requirements, solving the problems of incomplete solid-liquid separation, serious nitrogen loss, and high salt content in farmland existing in the existing livestock manure treatment technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A separation device for cow manure water, characterized in that it includes a permeation pool, a separation layer formation area, and a funnel-shaped multi-layer biomass permeation separation layer. A biomass partition layer and a large-particle hard partition layer are arranged at the lower part of the permeation pool. The biomass partition layer is on the inner layer, and the large-particle hard partition layer is on the outer layer. Under the support of the biomass partition layer and the large-particle hard partition layer, a separation layer formation area is formed in the permeation pool. A funnel-shaped multi-layer biomass permeation separation layer is formed in the separation layer formation area. The funnel-shaped multi-layer biomass permeation separation layer includes a separation layer surface layer, a separation layer bottom layer, and a separation layer intermediate layer. The separation layer surface layer is used to intercept solid substances and salts and produce acid. The separation layer bottom layer plays a supporting role. The separation layer intermediate layer is used for manure water permeation and intercepting solid substances.

[0007] The permeation pool is formed by enclosing three-sided support nets and one partition wall. The biomass partition layer is on the inner layer, and the large-particle hard partition layer is between the biomass partition layer and the support nets. Under the support of the support nets, the biomass partition layer, and the large-particle hard partition layer, a separation layer formation area is formed in the permeation pool.

[0008] A grille is also arranged on the side of the permeation pool that is the partition wall. Leakage holes are respectively arranged in the upper, middle, and lower parts of the grille. The aperture of the leakage holes gradually increases from bottom to top. The grille is fixed at the upper end of the partition wall. A sedimentation tank is also arranged on the partition wall. The sedimentation tank is communicated with the permeation pool through the grille.

[0009] The support nets are wire meshes, and the wire meshes are laid on wire mesh supports. The wire mesh supports are fixed on the bottom plate of the permeation pool. The upper end of the grille is lower than the upper edge of the sedimentation tank. The upper end of the partition wall is higher than the bottom of the sedimentation tank. A concentrated liquid slag discharge pipe is arranged at the bottom of the sedimentation tank.

[0010] The leakage holes in the lower part of the grille are 1 - 2 cm, the leakage holes in the middle part are 2 - 5 cm, and the leakage holes in the upper part are 5 - 10 cm.

[0011] A method for forming a separation device for cow manure water, characterized in that: The infiltration pond is set to be enclosed by three-sided support nets and one partition wall. A biomass interlayer and a large-particle hard interlayer are arranged at the lower part of the infiltration pond. The biomass interlayer is on the inner layer, and the large-particle hard interlayer is between the biomass interlayer and the support net. Form a separation layer formation area: Under the support of the support net, the biomass interlayer and the large-particle hard interlayer, a separation layer formation area is formed in the infiltration pond. Form a funnel-shaped multi-layer biomass infiltration separation layer: After the fecal sewage is sedimented and solid-liquid separated in the separation layer formation area, the middle deposited sludge is cleared to the inner side wall of the biomass interlayer, so that the deposited sludge flows from the inner surface of the biomass interlayer from top to bottom. The fibrous substances in the fecal sewage are intercepted on the inner side of the biomass interlayer through the biomass interlayer, and after natural dehydration and air drying to form a crust, a biomass infiltration separation layer is formed. The separated fecal sewage passes through the biomass infiltration separation layer, the biomass interlayer and the large-particle hard interlayer and is discharged from the infiltration pond. The fecal sewage is drained repeatedly for multiple times, and a new biomass infiltration separation layer is continuously formed, and finally a funnel-shaped multi-layer biomass infiltration separation layer is formed.

[0012] The specific process of forming the funnel-shaped multi-layer biomass infiltration separation layer is as follows: Form an initial biomass infiltration separation layer: Under the support of the biomass interlayer and the large-particle hard interlayer, an initial separation layer formation area is formed in the infiltration pond. The fibrous substances in the fecal sewage are intercepted on the inner side of the biomass interlayer and the adsorption material in the biomass interlayer through the biomass interlayer, forming an initial biomass infiltration separation layer. Form the first-layer biomass infiltration separation layer: The fecal sewage is separated in the separation layer formation area to form supernatant and deposited sludge. As the solids in the fecal sewage increase after separation, the middle deposited sludge is cleared to the inner side wall of the biomass interlayer. The initial biomass infiltration separation layer and the deposited sludge are mixed and fermented for the second time. As the solid-liquid separation process proceeds, the separated nitrogen-preserving liquid is discharged, the liquid level of the supernatant drops, and after air drying and crusting, the first-layer biomass infiltration separation layer is formed on the inner side of the initial separation layer formation area. Form a funnel-shaped multi-layer biomass infiltration separation layer: After repeatedly draining the fecal sewage for multiple times to form a new biomass infiltration separation layer, a funnel-shaped multi-layer biomass infiltration separation layer can be formed.

[0013] After the biological materials in the biomass interlayer are fully fermented, the degradable substances are degraded and become a part of the funnel-shaped multi-layer biomass infiltration separation layer, mainly playing the role of intercepting solids.

[0014] After the new biomass infiltration separation layer is continuously formed, the solids are getting higher and higher in the separation layer formation area. The wire mesh plays a supporting role, and the fecal sewage is always in the middle. By continuously clearing the deposited sludge, the deposited sludge is evenly and self-flowingly smeared on the inner surface, and finally a funnel-shaped multi-layer biomass infiltration separation layer composed of a separation layer surface layer, a separation layer bottom layer and a separation layer middle layer is formed.

[0015] A treatment method for a separation device for cow manure wastewater, characterized in that: The infiltration pond is set to be formed by enclosing three-sided support nets and one partition wall. A biomass interlayer and a large-particle hard interlayer are arranged at the lower part of the infiltration pond. The biomass interlayer is on the inner layer, and the large-particle hard interlayer is between the biomass interlayer and the support net; Form a separation layer formation area: Under the support of the support net, the biomass interlayer and the large-particle hard interlayer, a separation layer formation area is formed in the infiltration pond; Form a separated nitrogen-preserving liquid: Under the osmotic pressure of the initial separation layer formation area and the large-particle hard interlayer, the manure wastewater passes through the biomass interlayer. The biomass interlayer absorbs the clay-like suspended solids in the manure wastewater. The biological materials in the biomass interlayer and the intercepted clay-like suspended solids act together to carry out synergistic degradation to produce acidic substances, and a separated nitrogen-preserving liquid is formed in the manure wastewater after solid-liquid separation; Form a funnel-shaped multi-layer biomass infiltration separation layer: After the manure wastewater precipitates and solid-liquid stratifies in the separation layer formation area, the bottom sediment is cleared to the inner side wall of the biomass interlayer, so that the deposited sediment flows from top to bottom on the inner surface of the biomass interlayer. The fibrous substances in the manure wastewater are intercepted by the biomass interlayer on the inner side of the biomass interlayer and form a biomass infiltration separation layer after air-drying and crusting. The manure wastewater is drained repeatedly for multiple operations to continuously form a new biomass infiltration separation layer, and finally a funnel-shaped multi-layer biomass infiltration separation layer is formed; Manure wastewater treatment: The funnel-shaped multi-layer biomass infiltration separation layer continuously intercepts the solids in the manure wastewater and degrades and releases acidic substances into the manure wastewater, so that the degradable solids in the manure wastewater are degraded, and the refractory substances and fibrous substances naturally form a new biomass infiltration separation layer.

[0016] In the described treatment method, after clearing the solid manure, the large-particle hard interlayer is cleaned again, new biomass is added to the biomass interlayer, and the repeated separation and carbon preservation of the manure wastewater continue.

[0017] The advantages of adopting the present invention are as follows: 1. High-efficiency solid-liquid separation: Under the synergistic action of the grille, the biomass interlayer and the large-particle hard interlayer, through the funnel-shaped multi-layer biomass infiltration separation layer, the efficient interception of the solids in the cow manure wastewater is realized, and the solids and nutrients in the manure wastewater after mechanical separation are further separated, improving the solid-liquid separation effect.

[0018] 2. Acid release and nitrogen preservation: The surface layer of the funnel-shaped multi-layer biomass infiltration separation layer and the biomass interlayer release acidic substances during the treatment process, effectively inhibiting nitrogen volatilization, reducing nitrogen element loss, and improving the resource utilization value of the manure wastewater, which can be used for making organic fertilizers, etc.

[0019] 3. Convenient resource recovery: The intercepted solids and the funnel-shaped multi-layer biomass permeation separation layer can be recycled as raw materials for organic fertilizers, realizing the resource recycling of breeding waste and reducing the treatment cost.

[0020] 4. Good environmental protection performance: The device reduces nitrogen loss and environmental pollution during the treatment process, meets environmental protection requirements, and contributes to sustainable development.

[0021] 5. High return on investment: The device has a simple structure, low material cost, low energy consumption, is easy to promote and apply, and can greatly reduce the investment requirements for subsequent environmental protection facilities for dairy manure water and the environmental damage caused by nutrient loss.

[0022] 6. Compared with the existing technology, the present invention combines the basic fact that dairy manure contains a large amount of fibrous substances. By sorting sediment and suspended matter in the sedimentation tank, manure water mainly containing fibrous substances and clay-like substances is obtained and enters the formation area of the funnel-shaped multi-layer biomass permeation separation layer, so that the fibrous substances and clay-like substances are mainly intercepted and degraded on the surface layer of the separation layer. After degradation, the difficult-to-degrade substances (high content of fibrous substances) naturally form a funnel-shaped multi-layer biomass permeation separation layer; the middle layer of the separation layer and the middle layer of the separation layer further intercept and degrade fine solids and further gradually degrade and release acidic substances. The funnel-shaped multi-layer biomass permeation separation layer is a porous structure with a large separation area - a funnel-shaped structure, which improves the separation efficiency and functional zoning.

[0023] 7. Through the natural acidification and degradation process on the surface layer of the biomass partition layer, acidic substances are released for carbon preservation; the multi-layer structure of the middle layer of the separation layer, the middle layer of the separation layer, the biomass partition layer and the large-particle hard partition layer conducts uniform permeation separation. After the formation of the funnel-shaped multi-layer biomass permeation separation layer, a large amount of fibrous substances and solid substances such as suspended matter contained in dairy manure water are gradually and stably degraded, separated and acidified (the combination of acidic substances and carbonate ions), and the salt content of the separated liquid can also be greatly reduced. The present invention has the characteristics of high separation efficiency, no chemical input, good carbon preservation and salt reduction effects, extremely low treatment cost, high feasibility of large-scale promotion, etc. At the same time, it produces organic fertilizers locally and can turn the treatment of dairy manure water from loss to profit.

[0024] 8. In the present invention, the biomass partition layer absorbs the clay-like suspended matter in the manure water. The biomass material in the biomass partition layer and the intercepted clay-like suspended matter act together, making the carbon and nitrogen nutrients more balanced, so that aerobic and anaerobic microbial communities in the dairy manure water digest these degradable substances - degrade macromolecular organic substances into small-molecular organic substances, and acidification reactions occur in an anoxic environment. The small molecules are converted into organic acids (such as propionic acid, butyric acid, acetic acid) and other substances by fermenting bacteria. Under the action of the manure water seepage liquid, these acidic substances are quickly brought into the separated manure water to form a separated nitrogen-preserving liquid, thereby realizing the reduction of nitrogen element volatilization inhibition in the separated nitrogen-preserving liquid.

[0025] 9. In the present invention, the solids in the manure water are intercepted, degraded, and humified in the infiltration pond to form organic solid manure by the funnel-shaped multi-layer biomass infiltration separation layer. The funnel-shaped multi-layer biomass infiltration separation layer is composed of refractory substances and fibrous substances in the manure water, forming a porous biomass interception and degradation layer. Without adding a large amount of external materials, the whole process is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a top view of the present invention; Figure 2 is Figure 1 the sectional view taken along line I-I in Figure 3 is Figure 1 the sectional view taken along line II-II in the initial stage of the formation of the biomass infiltration separation layer in Figure 4 is Figure 1 the sectional view taken along line III-III after the formation of the funnel-shaped multi-layer biomass infiltration separation layer in The marks in the figure are: 1, inlet pipe; 2, concentrated liquid slag discharge pipe; 3, grit chamber; 4, grille; 5, biomass partition layer; 6, large particle hard partition layer; 7, wire mesh support; 8, infiltration pond; 9, support net; 10, infiltrated water; 11, deposited bottom mud; 12, supernatant; 13, dumping point; 14, bottom layer of the separation layer; 15, surface layer of the separation layer; 16, intermediate layer of the separation layer; 17, partition wall. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Example 1 A separation device for cow manure water includes an infiltration pond 8, a separation layer formation area, and a funnel-shaped multi-layer biomass infiltration separation layer. A biomass partition layer 5 and a large particle hard partition layer 6 are arranged at the lower part of the infiltration pond 8. The biomass partition layer 5 is on the inner layer and the large particle hard partition layer 6 is on the outer layer. Under the support of the biomass partition layer 5 and the large particle hard partition layer 6, a separation layer formation area is formed in the infiltration pond 8. A funnel-shaped multi-layer biomass infiltration separation layer is formed in the separation layer formation area. The funnel-shaped multi-layer biomass infiltration separation layer includes a surface layer 15 of the separation layer, a bottom layer 14 of the separation layer, and an intermediate layer 16 of the separation layer. The surface layer 15 of the separation layer is used to intercept solids and salts and produce acid. The bottom layer 14 of the separation layer plays a supporting role. The intermediate layer 16 of the separation layer is used for manure water infiltration and intercepting solids.

[0028] The infiltration pond 8 is formed by enclosing three sides of a support net 9 and one side of a partition wall 17. The biomass partition layer 5 is on the inner layer, and the large particle hard partition layer 6 is between the biomass partition layer 5 and the support net 9. Under the support of the support net 9, the biomass partition layer 5, and the large particle hard partition layer 6, a separation layer formation area is formed in the infiltration pond 8.

[0029] The infiltration pool 8 is also provided with a grille 4 on one side of the partition wall 17, and leakage holes are respectively provided on the upper, middle and lower parts of the grille 4, and the aperture of the leakage holes gradually increases from bottom to top. The grille 4 is fixed to the upper end of the partition wall 17, and a sedimentation pool 3 is also provided on the partition wall 17, and the sedimentation pool 3 is connected to the infiltration pool 8 through the grille 4.

[0030] The support net 9 is a wire mesh, which is laid on a wire mesh support 7, and the wire mesh support 7 is fixed on the bottom plate of the infiltration tank 8. The support net 9 maintains the structural stability of the funnel-shaped multi-layer biomass infiltration separation layer without collapse or cracking.

[0031] The upper end of the grid 4 is lower than the upper edge of the grit chamber 3 , the upper end of the partition wall 17 is higher than the bottom of the grit chamber 3 , and a concentrated liquid slag discharge pipe 2 is provided at the bottom of the grit chamber 3 .

[0032] In a method for forming a separation device for cow manure and water, at the initial stage of forming a funnel-shaped multi-layer biomass permeation separation layer, such as Figure 3 As shown, the manure water after natural flotation and sedimentation in the sedimentation tank 3 enters the infiltration tank 8, and forms an initial separation layer formation zone under the support of the biomass barrier 5 and the large-particle hard barrier 6. In the biomass barrier 5 are interlaced porous biomass materials, such as flattened corn stalks. Under the osmotic pressure of the initial separation layer formation zone and the large-particle hard barrier 6, the manure water passes through the biomass barrier 5. The biomass material in the biomass barrier 5 absorbs the clay-like suspended matter in the manure water, and the biomass material (high carbon content) and the intercepted clay-like suspended matter (high nitrogen content) work together, and the carbon and nitrogen nutrients are more balanced, and the acidic substances are synergistically degraded to produce acidic substances, which enter the manure water to form a separated nitrogen-retaining liquid, thereby suppressing the volatilization of nitrogen elements in the separated nitrogen-retaining liquid. At the same time, the fiber-like substances (cow manure water has a high fiber content because cows need to eat a lot of straw and other biomass) in the manure water are intercepted in the biomass barrier 5 on the inside to form an initial biomass permeation separation layer. In the initial separation layer formation area, under the action of vertical gravity and lateral osmotic pressure, a supernatant 12 and an inverted arc-shaped sedimentary sludge 11 are formed. After the fecal water in the initial separation layer formation area is separated for a period of time, as the solid matter increases, the sedimentary sludge 11 is moved from the middle to the inner wall of the biomass barrier 5 by manual shovel or excavator, and the initial biomass permeation separation layer and the sedimentary sludge 11 are mixed and fermented for a second time. As the separation process proceeds, the separated nitrogen-retaining liquid is discharged, the liquid level of the supernatant 12 drops, and the material on the inner surface of the biomass barrier 5 is dried and crusted to form the first layer of biomass permeation separation layer. Afterwards, the fecal water is drained from the liquid inlet pipe 1, and the above operations are performed multiple times in the initial separation layer formation area to form a funnel-shaped multi-layer biomass permeation separation layer, such as Figure 4 The biological materials in the biomass barrier layer 5 are also fully fermented, and the degradable substances (such as clay suspensions) are degraded and become part of the funnel-shaped multi-layer biomass permeation separation layer, which mainly plays the role of intercepting solids.

[0033] like Figure 4 As shown, the manure water is drained from the liquid inlet pipe 1 for many times, and then after the sedimentation and solid-liquid separation in the funnel-shaped multi-layer biomass permeation separation layer, the sediment sludge 11 is continuously moved to the discharge point 13 on the upper inner side of the funnel-shaped multi-layer biomass permeation separation layer by manual shovel or excavator, so that the sediment sludge 11 flows from top to bottom on the inner side. Under the action of gravity and lateral pressure permeation force, the liquid continuously seeps from the surface layer 15 of the separation layer to the middle layer 16 of the separation layer, and the degradable substances are degraded on the surface layer to release acidic substances to form a separated nitrogen-retaining liquid. The remaining difficult-to-degrade substances and fiber-like substances are deposited on the surface layer 15 of the separation layer, and a new biomass permeation separation layer is formed after being air-dried and crusted. Repeating the above operation, a new biomass permeation separation layer is continuously formed, and the deposited solids are getting higher and higher. The wire mesh plays a supporting role, making the funnel-shaped multi-layer biomass permeation separation layer a biomass layer funnel, and the manure water is always in the middle; by continuously digging and dumping the deposited sludge on the inner surface, the deposited sludge is evenly smeared on the inner surface by gravity, forming a multi-layer biomass permeation separation layer, continuously intercepting solids (including salt substances), and degrading and releasing acidic substances into the liquid. The degradable solids in the manure water are degraded and humified to form organic fertilizer, and the difficult-to-degrade substances and fiber substances naturally form a porous solid-liquid separation layer.

[0034] Treatment method for the separation device of dairy cow manure water: After the funnel-shaped multi-layer biomass permeation separation layer is formed, it is only necessary to repeatedly feed manure water, deposit the bottom mud 11, clear the bottom mud to the upper inner side of the separation layer for unloading, and the bottom mud is smeared on the surface layer 15 of the separation layer by self-flow, so as to form a multi-layer biomass permeation separation layer. As the separated solids increase, the inner surface of the funnel-shaped multi-layer biomass permeation separation layer also increases, and the surface layer 15 of the multi-layer biomass permeation separation layer can be used on a large scale for solid interception and penetration. This forms a multifunctional partition of the separation layer surface layer 15 (intercepting solids and salts, and producing acid), the separation layer bottom layer 14 (supporting function), and the middle multi-layer biomass permeation separation layer. As the funnel-shaped multi-layer biomass permeation separation layer accumulates more substances, it intercepts more fiber-like substances and adsorbs more suspended matter (salt), and the organic load and salt content of the separated nitrogen-retaining liquid are lower, which is more powerful for its back-end return to the field and utilization. After the biomass in the funnel-shaped multi-layer biomass permeation separation layer is fully deposited, it is fully humified for a period of time, and the decomposed organic matter is returned to the farmland as organic fertilizer, thereby achieving the purpose of realizing a green and low-carbon breeding cycle. The decomposed solid manure can be further utilized for high-quality manure because it fully retains and absorbs nutrients in the manure water. After removing the solid manure, the large-particle hard barrier 6 is cleaned again, and new biomass is added to the biomass barrier 5, and the repeated separation of manure water and carbon preservation can be continued.

[0035] Example 2 This embodiment further illustrates the present invention in conjunction with the accompanying drawings, as follows: Figures 1-4 shown in: A separation device for dairy manure wastewater, comprising a sand sedimentation tank 3, a permeation tank 8, a grille 4, a separation layer formation area, and a funnel-shaped multi-layer biomass permeation separation layer.

[0036] After mechanical solid-liquid separation, the dairy manure wastewater flows into the sand sedimentation tank 3 through the liquid inlet pipe 1. Under the action of gravity and buoyancy, the sediment, solids, etc. in the manure wastewater are deposited at the bottom of the sand sedimentation tank 3 under the action of natural sedimentation. A grille 4 is arranged between the sand sedimentation tank 3 and the permeation tank 8. The grille 4 is located in the upper half of the sand sedimentation tank 3. The lower part of the grille 4 is designed with leakage holes of 1-2 cm, the middle part is designed with leakage holes of 2-5 cm, and the upper part is designed with leakage holes of 5-8 cm, so that the floating scum can gradually float up and gather into blocks in the sand sedimentation tank 3, rather than directly flowing into the sand sedimentation tank 3, making the liquid flowing into the permeation separation area the middle liquid of the sand sedimentation tank 3. The upper part of the grille 4 is lower than the upper edge of the sand sedimentation tank 3. When the amount of manure liquid entering through the liquid inlet pipe 1 is too large, it can overflow naturally into the permeation tank 8 to prevent manure liquid from overflowing. The manure wastewater after preliminary sedimentation passes through the grille 4, and the grille 4 intercepts larger-sized floating objects and incompletely sedimented solid particles. Since the manure cleaning is carried out 1-2 times a day, that is, the feeding process is intermittent, a concentrated liquid discharge pipe 2 is designed at the bottom of the sand sedimentation tank 3 according to the size. Before each feeding, the upper floating scum and the concentrated liquid of the solid matter deposited at the bottom intercepted during the previous feeding are completely discharged. The manure wastewater that has undergone natural flotation and sedimentation in the sand sedimentation tank 3 enters the funnel-shaped multi-layer biomass permeation separation layer. The funnel-shaped multi-layer biomass permeation separation layer intercepts the solids in the manure wastewater. At the same time, the easily degradable substances in the manure wastewater are co-degraded on the surface layer 15 of the separation layer, which can release acidic substances, reduce the environmental pH value, inhibit the volatilization of nitrogen elements, and achieve acid release and nitrogen preservation.

[0037] The diameter of the liquid inlet pipe 1 is reasonably designed according to the breeding scale and the manure wastewater flow rate, and should be at least greater than 110 cm to ensure that the manure wastewater can flow smoothly into the device and avoid the blockage and aggregation of fibrous and hair-like solids.

[0038] The diameter of the discharge pipe should be greater than 200 cm and is equipped with a control valve to facilitate the timely and rapid discharge of the materials in the sand sedimentation tank 3.

[0039] The mesh size of the grille 4 can be selected according to the previous treatment process of dairy manure. Generally, the separated liquid after mechanical solid-liquid separation should be designed as described above. The general principle is that the lower part is small and the upper part is large. The size of the leakage holes is gradually increased according to the aggregation degree of the floating scum to ensure the timely discharge of the liquid by the grille 4 and prevent too much floating scum from aggregating, resulting in excessive instantaneous aggregation of the liquid in the sand sedimentation tank 3 and directly overflowing into the permeation separation area.

[0040] The infiltration pond 8 is set up with a wall on only one side and no walls on the other three sides, only with a support frame and a support net 9 fixed on the support frame. The lower part of the infiltration pond 8 is composed of a biomass interlayer 5 and a large-particle hard interlayer 6 to form an initial separation layer formation area. The biomass interlayer 5 is in the inner layer and the large-particle hard interlayer 6 is in the outer layer. The main function of the biomass interlayer 5 is to play a role at the initial stage of the formation of the funnel-shaped multi-layer biomass infiltration separation layer, form the initial separation layer formation area, intercept solids and adsorb nitrogen and phosphorus in the sewage, and naturally degrade and release acidic substances. The large-particle hard interlayer 6 mainly plays a supporting role to ensure that the solids in contact with the biomass interlayer 5 (the cow dung water has a high fiber content because cows need to eat a large amount of biomass such as straw) gradually accumulate, forming a larger biomass interlayer 5 and continuously releasing acidic substances. As the deposited substances increase, a funnel-shaped multi-layer biomass infiltration separation layer is formed, and the biomass interlayer 5 also turns into the bottom layer 14 of the separation layer along with its own degradation, and can intercept more refractory solids containing a large amount of fibrous substances. When the initial separation layer formation area accumulates to a certain extent, the deposited bottom mud 11 in the middle of the infiltration pond 8 is moved to the surrounding by manual or excavator. After continuously removing the deposited bottom mud 11 to the surface of the separation layer for degradation, drying, and crusting, a new biomass infiltration separation layer is formed. As the funnel-shaped multi-layer biomass infiltration separation layer accumulates higher and higher, wire meshes are needed for support, and the entire infiltration separation area becomes a biomass funnel that can achieve solid-liquid infiltration separation under the support of the wire meshes on three sides and the partition wall 17. The manure water is always in the middle of the funnel-shaped multi-layer biomass infiltration separation layer and continuously seeps out under the action of gravity and osmotic pressure. The funnel-shaped multi-layer biomass infiltration separation layer continuously intercepts solids (including salt substances) over a large area to form a new biomass infiltration separation layer; the easily degradable substances in the manure water are also effectively decomposed on the surface of the separation layer and quickly release acidic substances.

[0041] After the biomass in the funnel-shaped multi-layer biomass infiltration separation layer is filled (reaching the lower edge of the grille 4), the decomposed organic matter is removed and applied as an intermediate such as organic fertilizer, the large-particle hard interlayer 6 is cleaned again, and new biomass is added to the biomass interlayer 5, and the repeated separation and carbon preservation of the manure water can continue.

[0042] The biomass interlayer 5 is composed of large-size biomass materials with certain adsorption effects, such as flattened whole corn plants, hard straws such as cotton, and large-particle biochar. These biomass materials are stacked horizontally to prevent leaks and are laid inside the net of the biomass interlayer 5.

[0043] The large-particle hard interlayer 6 is arranged between the biomass interlayer 5 and the wire mesh and is filled with large-particle hard materials such as cobblestones and river pebbles. For example, cobblestones with a diameter of 5 - 10 cm can be selected. The large-particle hard interlayer 6 mainly plays a role in supporting the biomass interlayer 5 to prevent the biomass interlayer 5 from being compacted and affecting the interception effect.

[0044] The wire mesh is laid on the wire mesh support 7, which is mainly used to support the biomass deposition layer removed from the middle of the infiltration pond 8 to prevent it from collapsing, support the formed funnel-shaped multi-layer biomass infiltration separation layer, filter solids, and ensure that the quality of the discharged infiltration water 10 meets certain standards. Its mesh size can ensure the support effect while not hindering the flow of water.

[0045] The wire mesh support 7 is used to hold the wire mesh and support the biomass partition layer 5 and the large particle hard partition layer 6 to ensure the stability of its structure. The wire mesh support 7 has sufficient strength and corrosion resistance.

[0046] After adopting the funnel-shaped multi-layer biomass infiltration separation layer formation technology, the solids in the cow manure water after mechanical separation can be further removed, and the solids removal rate reaches more than 60%. The salt content in the manure water is reduced by more than 30%, and the nitrogen volatilization rate of the wastewater is reduced by more than 10%.

[0047] Example 3 This example illustrates the application of the present invention in a small-scale farm: In a small-scale farm, according to the daily manure water production of about 20 cubic meters in the farm, a PVC inlet pipe 1 with a diameter of 110 mm is selected. Its material is light, the cost is low, and it can meet the demand for the inflow of manure water. During installation, it is necessary to ensure that the pipeline slope is appropriate to prevent liquid accumulation and blockage, and it is tightly connected to the manure water collection channel of the farm and sealed well. The volume of the sedimentation tank 3 is designed to be 0.5 cubic meters, and the bottom is set at a certain slope to facilitate the aggregation of sediment to the slag discharge port. A deflector is installed below the inlet pipe 1 to guide the manure water to flow in evenly and disperse, improving the sedimentation effect.

[0048] The grille 4 is made of stainless steel with a pore size of 5 mm, and the installation angle is slightly inclined towards the slag discharge side to facilitate the cleaning of intercepted objects. Its height is 10 cm lower than the upper edge of the sedimentation tank 3 to prevent overflow. The biomass partition layer 5 uses pre-dried corn straw, cut into 8 cm lengths, laid in 2 layers, and the thickness is about 10 cm. The large particle hard partition layer 6 selects pebbles with a particle size of 5 - 8 cm, laid 10 cm thick, and evenly distributed between the biomass partition layer 5 and the wire mesh. The wire mesh support 7 is made of rectangular stainless steel with a specification of 1.5 cm * 1.5 cm, and is firmly installed after anti-rust treatment. A wire mesh with a pore size of 0.8 mm is laid on the wire mesh support 7, and the bottom slope is set at 3% to facilitate the collection and discharge of infiltration water.

[0049] During operation, the fecal wastewater is introduced into the device at a rate of 2 cubic meters per hour at a fixed time every day to avoid excessive impact. The grille 4 is inspected and cleaned every 3 days to prevent blockage. The pH value of the biomass layer 5 is detected weekly and maintained within an appropriate range. If it is too high, an appropriate amount of unfermented sawdust is added for adjustment; at the same time, the retention of solids is observed, and straw is supplemented if necessary. The quality of the permeate water is detected regularly. The valve of the concentrated liquid slag discharge pipe 2 is opened once every 2 days to discharge slag, and the intercepted substances are transported to the composting area. The device is comprehensively inspected every 2 months, the loose parts are tightened, the damaged parts are repaired or replaced, the biomass layer 5 is turned over to ensure the porosity, and whether the large-particle hard layer 6 is caked is inspected and processed.

[0050] Example 4 This example illustrates the application of the present invention in a medium-sized farm: The fecal wastewater production in a medium-sized farm is relatively large, about 50 cubic meters per day. The inlet pipe 1 is made of HDPE pipe with a diameter of 130 mm, which has good corrosion resistance and compressive capacity. The pipeline layout is reasonably planned according to the farm layout to ensure the stable transportation of fecal wastewater to the device. The connection is fixed with a rubber sealing ring and a stainless steel clamp with excellent sealing performance. The sedimentation tank 3 is made of concrete structure with a volume of 10 cubic meters. A mechanical stirring device is installed inside to stir regularly to promote the sedimentation of sediment. The stirring frequency is once every 2 days, and each stirring lasts for 30 minutes.

[0051] The mesh size of the grille 4 is designed to be 8 mm * 8 mm according to the degree of mechanical pretreatment. The biomass layer 5 is made of a mixture of corn straw and cotton in a ratio of 3:1. The straw is cut into 12 cm lengths and laid in 3 layers with a total thickness of 10 - 12 cm. A nylon net with a pore diameter of 3 cm is laid between each layer to promote air circulation and water penetration. Before laying, it is soaked in a mixed solution of microbial inoculant and water in a ratio of 1:10 for 3 hours. The large-particle hard layer 6 is made of pebbles with a particle size of 8 - 10 cm and laid with a thickness of 12 - 15 cm to provide a stable support and good filtering effect for the biomass layer 5. The wire mesh support 7 is made of stainless steel with a mesh size of 3 cm * 3 cm to ensure the support strength and smooth water flow. The bottom slope of the permeation tank 8 is set to 8%, and the surface is coated with an anti-corrosion coating.

[0052] During the operation process, it is maintained at about 5 cubic meters per hour. The cleaning situation of the grille 4 and the operating status of each component are checked every day. The performance of the biomass layer 5 is checked every week, and maintenance or material supplementation is carried out according to the pH value and the retention effect. A comprehensive inspection of the device is carried out every month to check the equipment wear, corrosion and pipeline leakage conditions, and repair and replacement are carried out in a timely manner; the sediment at the bottom of the permeation tank 8 is cleaned every quarter to ensure the normal discharge of the permeate water and the stable treatment effect.

[0053] Example 5 This example illustrates the application of the present invention in a medium-sized farm: In large-scale farms, due to the huge amount of manure water produced, which can reach 500 cubic meters or more per day, the implementation of the present invention can integrate an intelligent system design.

[0054] First, the inlet pipe 1 uses a pipe network with a diameter of more than 200 mm, and is precisely planned according to the terrain of the breeding site and the distribution of breeding areas to ensure that the manure water can be quickly and evenly transported to each treatment unit. The grit chamber 3 is made of reinforced concrete with a volume of not less than 100 cubic meters, and the sediment can be periodically sucked out to maintain the efficient operation of the grit chamber 3.

[0055] The grille 4 is made of stainless steel, and the mesh size is designed to be 15-20 mm according to the pre-mechanical pretreatment effect of the farm and the characteristics of the manure water. The biomass interlayer 5 is composed of a variety of biomass materials, including corn straw, cotton, etc., mixed in a specific proportion. The straw is cut into about 20 cm in length and laid in 4 layers with a total thickness of 12-15 cm. To enhance the microbial activity, before laying, the biomass materials are pre-fermented in a dedicated fermentation tank for 2-3 days, and specific microbial flora and nutrients are added to improve the adsorption capacity of solids and the release efficiency of acidic substances.

[0056] The large-particle hard interlayer 6 is filled with cobblestones with a particle size of 5-10 cm and laid with a thickness of 10-15 cm to provide support for the biomass interlayer 5, while ensuring good water flow filtration and distribution effects. The wire mesh support 7 is made of heavy-duty stainless steel, professionally designed and reinforced in terms of mechanical structure, with a mesh size of 5 cm * 5 cm, ensuring that it can withstand huge weights and pressures, stably support the upper interlayer, and ensure smooth water flow through.

[0057] The bottom slope of the infiltration pond 8 is set at more than 12%, and double-layer anti-corrosion and anti-leakage treatment technologies are adopted to ensure long-term stable operation. At the outlet of the infiltration pond 8, indicators such as chemical oxygen demand, total nitrogen, and total phosphorus of the infiltrated water can be monitored in real time for operation effect analysis. According to the results, operation parameters such as the liquid inlet speed, stirring frequency, and bottom sludge cleaning time are adjusted. For example, when it is detected that the pH value of the biomass interlayer 5 deviates from the optimal range, appropriate acidic or alkaline substances are added for correction; if there is a failure or poor treatment effect at a certain place, dispatch and maintenance personnel carry out emergency repairs to ensure that the manure water of the entire farm is continuously treated, always maintaining an efficient and stable treatment effect, and realizing the resource utilization of breeding waste and environmentally friendly discharge.

Claims

1. A separation device for cow manure wastewater, characterized in that: It includes a permeation pond (8), a separation layer formation area, and a funnel-shaped multi-layer biomass permeation separation layer. A biomass partition layer (5) and a large-particle hard partition layer (6) are arranged at the lower part of the permeation pond (8). The biomass partition layer (5) is on the inner layer, and the large-particle hard partition layer (6) is on the outer layer. Under the support of the biomass partition layer (5) and the large-particle hard partition layer (6), a separation layer formation area is formed in the permeation pond (8). A funnel-shaped multi-layer biomass permeation separation layer is formed in the separation layer formation area. The funnel-shaped multi-layer biomass permeation separation layer includes a separation layer surface layer (15), a separation layer bottom layer (14), and a separation layer intermediate layer (16). The separation layer surface layer (15) is used to intercept solids and salts and produce acid. The separation layer bottom layer (14) plays a supporting role. The separation layer intermediate layer (16) is used for the permeation of manure water and the interception of solids.

2. The separation device for cow manure wastewater according to claim 1, characterized in that: The permeation pond (8) is formed by enclosing with three-sided support nets (9) and one-sided partition wall (17). The biomass partition layer (5) is on the inner layer, and the large-particle hard partition layer (6) is between the biomass partition layer (5) and the support net (9). Under the support of the support net (9), the biomass partition layer (5), and the large-particle hard partition layer (6), a separation layer formation area is formed in the permeation pond (8).

3. The separation device for cow manure wastewater according to claim 2, characterized in that: On one side of the partition wall (17) of the permeation pond (8), a grille (4) is also provided. Leakage holes are respectively arranged in the upper, middle, and lower parts of the grille (4), and the aperture of the leakage holes gradually increases from bottom to top. The grille (4) is fixed at the upper end of the partition wall (17). A sedimentation tank (3) is also arranged on the partition wall (17). The sedimentation tank (3) is communicated with the permeation pond (8) through the grille (4).

4. The separation device for cow manure wastewater according to claim 3, characterized in that: The support net (9) is a wire net, and the wire net is laid on a wire net support (7). The wire net support (7) is fixed on the bottom plate of the permeation pond (8). The upper end of the grille (4) is lower than the upper edge of the sedimentation tank (3), the upper end of the partition wall (17) is higher than the bottom of the sedimentation tank (3), and a thick liquid slag discharge pipe (2) is arranged at the bottom of the sedimentation tank (3).

5. A formation method of a separation device for cow manure water, characterized in that: The permeation pond (8) is arranged to be formed by enclosing with three-sided support nets (9) and one-sided partition wall (17). A biomass partition layer (5) and a large-particle hard partition layer (6) are arranged at the lower part of the permeation pond (8). The biomass partition layer (5) is on the inner layer, and the large-particle hard partition layer (6) is between the biomass partition layer (5) and the support net (9); Form a separation layer formation area: Under the support of the support net (9), the biomass partition layer (5), and the large-particle hard partition layer (6), a separation layer formation area is formed in the permeation pond (8); Form a funnel-shaped multi-layer biomass permeation separation layer: After the fecal wastewater undergoes sedimentation and solid-liquid separation in the separation layer formation area, the intermediate sediment sludge (11) is cleared towards the inner wall of the biomass separation layer (5), causing the sediment sludge (11) to flow from the inner surface of the biomass separation layer (5) from top to bottom. The fibrous substances in the fecal wastewater are intercepted inside the biomass separation layer (5) through the biomass separation layer (5), and after natural dehydration and air drying to form a crust, a biomass permeation separation layer is formed. The separated fecal wastewater passes through the biomass permeation separation layer, the biomass separation layer (5), and the large-particle hard separation layer (6) and is discharged from the permeation pool (8). The fecal wastewater is drained multiple times and the operation is repeated to continuously form a new biomass permeation separation layer, ultimately forming a funnel-shaped multi-layer biomass permeation separation layer.

6. A forming method of a separation device for cow manure water according to claim 5, characterized in that: The specific process of forming the funnel-shaped multi-layer biomass permeation separation layer is as follows: Form the initial biomass permeation separation layer: Under the support of the biomass separation layer (5) and the large-particle hard separation layer (6), an initial separation layer formation area is formed in the permeation pool (8). The fibrous substances in the fecal wastewater are intercepted inside the biomass separation layer (5) and on the adsorption material inside the biomass separation layer (5) through the biomass separation layer (5) to form the initial biomass permeation separation layer. Form the first-layer biomass permeation separation layer: The fecal wastewater separates in the separation layer formation area to form a supernatant (12) and sediment sludge (11). As the solids increase after the fecal wastewater separation, the intermediate sediment sludge (11) is cleared towards the inner wall of the biomass separation layer (5). The initial biomass permeation separation layer and the sediment sludge (11) are mixed and undergo secondary fermentation. As the solid-liquid separation process proceeds, the separated nitrogen-preserving liquid is discharged, the liquid level of the supernatant (12) drops, and after air drying and crust formation, the first-layer biomass permeation separation layer is formed inside the initial separation layer formation area. Form the funnel-shaped multi-layer biomass permeation separation layer: After repeatedly draining the fecal wastewater and forming a new biomass permeation separation layer through repeated operations, the funnel-shaped multi-layer biomass permeation separation layer can be formed.

7. A forming method of a separation device for cow manure wastewater according to claim 6, characterized in that: After the biological materials in the biomass separation layer (5) are fully fermented, the degradable substances are degraded and become part of the funnel-shaped multi-layer biomass permeation separation layer, mainly playing the role of intercepting solids.

8. A forming method of a separation device for cow manure wastewater according to claim 7, characterized in that: After the new biomass permeation separation layer is continuously formed, the solids become higher and higher in the separation layer formation area. The wire mesh plays a supporting role, and the fecal wastewater is always in the middle. By continuously clearing the sediment sludge, the sediment sludge is evenly and self-flowingly smeared on the inner surface, ultimately forming a funnel-shaped multi-layer biomass permeation separation layer composed of a separation layer surface layer (15), a separation layer bottom layer (14), and a separation layer intermediate layer (16).

9. A treatment method for a separation device for dairy cow fecal wastewater, characterized in that: The permeation pool (8) is arranged to be enclosed by three-sided support nets (9) and one partition wall (17). The lower part of the permeation pool (8) is provided with a biomass separation layer (5) and a large-particle hard separation layer (6). The biomass separation layer (5) is on the inner layer, and the large-particle hard separation layer (6) is between the biomass separation layer (5) and the support net (9). Form a separation layer formation area: Under the support of the support net (9), the biomass separation layer (5), and the large-particle hard separation layer (6), a separation layer formation area is formed in the permeation pool (8). Forming a separation nitrogen-retaining liquid: Under the osmotic pressure of the initial separation layer formation zone and the large-particle hard barrier layer (6), the manure water passes through the biomass barrier layer (5), and the biomass barrier layer (5) absorbs the clay-like suspended matter in the manure water. The biological materials in the biomass barrier layer (5) and the retained clay-like suspended matter work together to synergistically degrade and produce acidic substances, which enter the manure water after solid-liquid separation to form a separation nitrogen-retaining liquid; Forming a funnel-shaped multi-layer biomass permeation separation layer: after the feces and water are precipitated and the solid-liquid layers are separated in the separation layer formation area, the bottom sediment (11) is moved to the inner wall of the biomass barrier layer (5), so that the sediment (11) flows from top to bottom on the inner surface of the biomass barrier layer (5), and the fiber-like substances in the feces and water are intercepted by the biomass barrier layer (5) on the inner side of the biomass barrier layer (5), and the biomass permeation separation layer is formed after being air-dried and crusted. The feces and water are drained and the operation is repeated for many times to continuously form a new biomass permeation separation layer, and finally a funnel-shaped multi-layer biomass permeation separation layer is formed; Manure water treatment: The funnel-shaped multi-layer biomass permeation separation layer continuously intercepts the solids in the manure water, and degrades and releases acidic substances into the manure water, so that the degradable solids in the manure water are degraded, and the difficult-to-degrade substances and fibrous substances naturally form a new biomass permeation separation layer.

10. The treatment method of a separation device for dairy cow manure wastewater according to claim 9, characterized in that: After the solid manure is removed, the large-particle hard barrier (6) is cleaned again, and new biomass is added to the biomass barrier (5), and the repeated separation of manure and water is continued to preserve carbon.

Images