Livestock and poultry breeding wastewater treatment and deep phosphorus removal system and treatment method

Abstract

The invention belongs to the technical field of livestock and poultry breeding wastewater treatment and waste utilization, and discloses a livestock and poultry wastewater treatment and deep phosphorus removal system and a livestock and poultry wastewater treatment method. The livestock and poultry wastewater treatment and deep phosphorus removal system provided by the invention specifically comprises a solid-liquid separation device, a wastewater treatment device, a deep phosphorus removal device and a sludge (excrement) utilization device, the wastewater treatment and deep phosphorus removal system comprises a biogas digester, a biochemical treatment device, an adsorption phosphorus removal device and a sludge treatment system which are communicated in sequence. A water inlet of the biogas digester is communicated with a water outlet of the solid-liquid separation device, a water outlet of the biogas digester is communicated with the biochemical treatment device, and a water outlet of the biochemical treatment device is communicated with a water inlet of the adsorption dephosphorization device. When the treatment system is used for treating the livestock and poultry breeding wastewater, resource utilization of the livestock and poultry breeding waste and wastewater can be fully achieved, the concentration of pollutants in effluent is far lower than the existing livestock and poultry wastewater discharge standard, meanwhile, harmless discharge or resource utilization of the livestock and poultry breeding wastewater is achieved, and the treatment system has good application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of aquaculture wastewater treatment, and in particular relates to a livestock and poultry aquaculture wastewater treatment and deep phosphorus removal system and a treatment method. Background Art

[0002] Livestock and poultry breeding wastewater refers to wastewater produced during the livestock and poultry breeding process that contains a large amount of organic matter such as feces, urine, and leftover feed. It is a special agricultural resource rich in nitrogen, phosphorus, and organic matter. Therefore, the existing treatment technology focuses more on the resource utilization of livestock and poultry breeding wastewater - after treating livestock and poultry breeding wastewater through biological methods such as composting, anaerobic biogas production, aerobic, and physical methods such as filtration and sedimentation, the residual liquid is used for farmland irrigation after sedimentation in biochemical ponds.

[0003] However, after the livestock and poultry breeding wastewater is treated with the current livestock and poultry breeding wastewater treatment device and method, the discharged water still contains high concentrations of pollutants, including: COD of 300-1500 mg / L, BOD of 150-800 mg / L, ammonia nitrogen less than 200 mg / L, and total phosphorus of 30-80 mg / L. If it is directly used for irrigation of farmland or for irrigation of forest land, and soil absorption is carried out, it will eventually cause the enrichment of total phosphorus in the soil. When it rains, the enriched phosphorus is injected into the river with rainwater, resulting in excessive total phosphorus in the river water, which has a great adverse impact on the environment.

[0004] Through the monitoring of river and lake water quality sections set up by the state and governments at all levels, it is found that the main problem of water quality sections is that the total phosphorus exceeds the standard, and many of them occur within one or two days after the rain, and then gradually return to normal. It is judged that it is caused by the accumulation of total phosphorus in the soil. Therefore, we should focus on the discharge of total phosphorus in livestock and poultry wastewater, deeply purify poultry wastewater, and efficiently and thoroughly remove the total phosphorus in livestock and poultry wastewater, which is a problem that must be solved. Summary of the invention

[0005] In order to solve the above problems and realize resource utilization, treatment and deep purification of livestock and poultry breeding wastewater, the present application discloses a livestock and poultry breeding wastewater treatment and deep phosphorus removal system, which is characterized by comprising a solid-liquid separation device, a wastewater treatment device, a deep phosphorus removal device and a sludge dehydration device;

[0006] The solid-liquid separation device is used for solid-liquid separation of livestock and poultry manure, and includes a collection tank, a primary sedimentation tank, a lifting pump, a solid-liquid separator and a dry manure yard; the water inlet of the collection tank is connected to the sewage outlet of the breeding farm, and the water outlet of the collection tank is connected to the water inlet of the primary sedimentation tank. The collection tank is used to collect livestock and poultry manure and collect livestock and poultry house flushing water. The primary sedimentation tank is used to perform gravity sedimentation separation on the manure; the primary sedimentation tank is a circular or square concrete tank, and a supernatant outlet is provided at the top, and the supernatant outlet is connected to the feed port of the biogas tank, and a manure sewage outlet is provided at the bottom, and the sewage outlet is connected to the solid-liquid separator through the sewage pump, and the manure is separated into solid manure sludge and sewage through the solid-liquid separator, and the sewage enters the water inlet of the biogas tank;

[0007] The wastewater treatment device comprises a biogas tank, a biogas slurry collection tank, a biochemical treatment unit, a secondary sedimentation tank, a coagulation reaction tank and a coagulation sedimentation tank which are connected in sequence; the water inlet of the biogas tank is connected to the water outlet of the solid-liquid separator, the water outlet of the biogas tank is connected to the biogas slurry collection tank, and the water outlet of the biogas slurry collection tank is connected to the water inlet of the biochemical treatment unit; the biochemical treatment unit is used to further purify and remove pollutants such as COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater, so that the COD of the biochemical effluent is less than 400 mg / L, the BOD is less than 150 mg / L, the ammonia nitrogen is less than 80 mg / L, the total nitrogen is less than 120 mg / L and the suspended solids are less than 200 mg / L; the sludge in the secondary sedimentation tank and the coagulation sedimentation tank are respectively pumped into the sludge concentration tank of the sludge dewatering device;

[0008] The biochemical treatment unit comprises at least one aerobic tank, one aerobic tank and one anaerobic tank, or a combination of an anaerobic tank, an aerobic tank, an anaerobic tank and an aerobic tank;

[0009] The deep phosphorus removal device is used to further remove the total phosphorus in the tail water after the treatment by the biochemical treatment device, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and the phosphorus pollution of the livestock and poultry breeding tail water to the natural water body is eradicated. The deep phosphorus removal device is composed of a filter and an adsorption phosphorus removal bed; the filter and the adsorption phosphorus removal bed are connected in sequence;

[0010] The sludge dewatering device is used for dewatering sludge in a wastewater treatment device, and comprises a sludge concentration tank, a sludge pump and a sludge dewatering machine which are connected in sequence.

[0011] Preferably, the filter of the deep phosphorus removal device is any one of a precision filter, a rotary microfilter, and a multi-media filter, and the water inlet of the filter is connected to the water outlet of the secondary sedimentation tank of the biochemical treatment device; the water outlet of the filter is connected to the water inlet of the adsorption phosphorus removal bed of the deep phosphorus removal system.

[0012] Preferably, the adsorption phosphorus removal bed of the deep phosphorus removal system is composed of a tank body, an aeration pipe installed at the bottom of the tank body, a grille installed on the aeration pipe, a targeted adsorption phosphorus removal filler above the grille and a tank body cover; the aeration pipe of the deep phosphorus removal system is connected to an aeration fan.

[0013] Preferably, the targeted adsorption dephosphorization filler of the deep dephosphorization device is a calcium-based expanded filler, which is expanded by gypsum powder, calcium hydroxide powder, iron oxyhydroxide powder, cement and cement foaming agent, has a honeycomb porous structure, an average particle size of 3 to 50 mm, and a specific surface area of ​​8 to 10 m 2 / g, bulk density is 410~600kg / m 3 , dry density ≤750kg / m 3 , cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

[0014] Preferably, the phosphorus absorption filler of the adsorption dephosphorization bed has a thickness of 1000-5000 mm. Preferably, the sludge dewatering device is used for sludge dewatering of a wastewater treatment device, and the sludge dewatering device comprises a sludge concentration tank, a sludge pump and a sludge dewatering machine.

[0015] Preferably, the livestock and poultry breeding wastewater treatment and deep phosphorus removal system also includes a feces (sludge) utilization system, and the feces (sludge) utilization system includes a shovel, a hopper, an aerobic fermentation bin, a deodorization device, a silo, a pulverizer, a drum screening machine and a packaging machine.

[0016] A method for deep phosphorus removal of livestock and poultry wastewater, specifically comprising the following steps:

[0017] S1: Solid-liquid separation: livestock and poultry manure is collected into a manure collection tank, pumped into a sedimentation tank for sedimentation and separation, the supernatant of the sedimentation tank enters the biogas tank, and the manure at the bottom of the sedimentation tank enters the solid-liquid separator for dehydration to obtain sludge and sewage with a moisture content of less than 65%; the sludge is sent to a high-temperature aerobic fermentation tank by a forklift to ferment and produce fertilizer, and the sewage enters the wastewater and is collected into the biogas tank;

[0018] S2: Wastewater treatment: The wastewater is collected into a biogas tank for anaerobic fermentation to produce biogas and residual liquid. The residual liquid is injected into the biogas collection tank with a COD of 500-3000 mg / L, a BOD of 200-1600 mg / L, ammonia nitrogen of 400-900 mg / L, and total phosphorus of 50-90 mg / L. It then enters the biochemical treatment unit of the biochemical treatment device and runs for 24-72 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed by microbial treatment. Then, the wastewater enters the secondary sedimentation tank for sedimentation and separation, and then enters the coagulation reaction tank and coagulation sedimentation tank for purification. The coagulation and sedimentation conditions are: PCA dosage is 2% concentration 6L / m 3 , stirring, PAM dosage is 1‰ concentration 3L / m 3 , after purification, COD is less than 200mg / L, BOD is less than 80mg / L, ammonia nitrogen is less than 80mg / L, and total phosphorus is 25-60mg / L;

[0019] S3: Adsorption phosphorus removal: The effluent from the coagulation sedimentation tank of the biochemical treatment device is lifted into the filter, and the effluent from the filter enters the adsorption phosphorus removal bed for adsorption phosphorus removal. The residence time is not less than 2.5 to 5 hours, and deep phosphorus removal effluent is obtained, with COD less than 200 mg / L, BOD less than 80 mg / L, ammonia nitrogen less than 80 mg / L, and total phosphorus less than 0.2 mg / L, which is directly discharged into the drain outlet.

[0020] Preferably, a method for treating livestock and poultry wastewater and deep phosphorus removal also includes a sludge dehydration method, using the above-mentioned sludge dehydration device to dehydrate the sludge according to the following steps:

[0021] S41: Sludge concentration: The biochemical treatment sludge of the biogas residue is input into the sludge concentration tank for gravity concentration to obtain supernatant and concentrated sludge, and the supernatant is pumped into the biochemical treatment device for treatment;

[0022] S42: Dehydration: The concentrated sludge is pumped into a dehydrator by a sludge pump to be dehydrated into sludge and sewage, and then pumped into a biochemical treatment device for treatment.

[0023] Preferably, a method for treating livestock and poultry wastewater and deep phosphorus removal is characterized in that it also includes using the above-mentioned feces (sludge) utilization system to prepare organic fertilizer according to the following steps:

[0024] S51: Fermentation and fertilizer production: The dehydrated solid feces with a water content of less than 65% are sent into the hopper by a forklift, and then sent into the fermentation bin from the top of the fermentation bin, and aerobic fermented at 50-65° C. for 4-7 days, and discharged from the bottom and sent to the crusher via a conveyor belt;

[0025] S52: The fertilizer obtained by fermentation in step (1) is conveyed to a pulverizer via a conveyor belt for pulverization, and then put into a drum screen for screening;

[0026] S53: screening: screening the fertilizer crushed in step (2) through a drum screen into fertilizer with uniform particle size;

[0027] S54: Packaging: The compost obtained by screening in step (3) is fed into a packaging machine for packaging to obtain finished fertilizer.

[0028] In the present application, in order to fully decompose the sludge (feces) and generate a more stable dry-based organic fertilizer, the compost organic matter and the sludge are mixed in a mass ratio of (5-10):1 and then fermented to obtain dry-based organic fertilizer; in some specific embodiments, the compost organic matter and the sludge are specifically 5:1, 6:1, 7:1, 8:1, 9:1, 10:1 or any value therebetween.

[0029] In the present application, in order to further improve the functionality of dry-based organic fertilizer, 1.5-5wt% of probiotics are preferably added to the dry-based organic fertilizer; the added probiotics are a type of functional bacteria that can increase crop yield, activate crop immune system and improve crop resistance.

[0030] In order to increase the nitrogen, phosphorus and potassium content in the fertilizer in the present application so as to meet the organic fertilizer standard of not less than 4% nitrogen, phosphorus and potassium, after the fermentation and composting is completed, 0.5-2% by weight of struvite powder is added as needed.

[0031] In the treatment system provided by the present application, livestock and poultry breeding wastewater containing feces is first precipitated to separate the solid and liquid, and separated into wastewater at the top of the sedimentation tank and muddy water with sludge at the bottom, and then the wastewater and muddy water are treated separately, which not only achieves the effect of full resource utilization of livestock and poultry wastewater, but also the effluent discharged to the environment is far lower than the existing livestock and poultry breeding wastewater discharge standard, and also achieves the compliance discharge of livestock and poultry breeding wastewater, especially purifying the total phosphorus in the discharged wastewater to 0.2 mg / L, preventing the total phosphorus in the wastewater from accumulating in the soil and polluting the river.

[0032] By adopting the above technical solution, the livestock and poultry breeding wastewater treatment and deep phosphorus removal system provided by the present application has the following progress and advantages compared with the prior art:

[0033] 1. It has radically solved the pollution caused by livestock and poultry breeding. The pollution caused by livestock and poultry breeding includes two major pollution sources, namely, feces and wastewater, which lead to soil and water pollution and cause the total phosphorus in the polluted water to exceed the standard. The present invention applies the solid-liquid separation of feces into solid feces, and then produces organic fertilizer through high-temperature aerobic fermentation, thereby eliminating the pollution caused by feces. At the same time, the wastewater is subjected to biochemical treatment and adsorption for phosphorus removal, so that the total phosphorus in the effluent is less than 0.2 mg / L, thereby eliminating the pollution of wastewater, thereby fundamentally solving the problem of pollution caused by livestock and poultry breeding.

[0034] 2. Realize the comprehensive utilization of resources. Starting from the actual utilization of livestock and poultry breeding waste and wastewater treatment, the livestock and poultry breeding wastewater treatment and tailwater deep phosphorus removal system of the present application separates the livestock and poultry breeding manure into solid-liquid, and then ferments the solid manure into organic fertilizer, which not only eliminates the pollution of livestock and poultry breeding manure to the environment, but also realizes resource utilization, turning each livestock and poultry farm into a small fertilizer plant.

[0035] 3. The phosphorus resources in the wastewater are recycled. The phosphorus in the wastewater is adsorbed in the filler through the adsorption dephosphorization bed. After the adsorption is saturated, the phosphorus resources are recovered through dewashing and precipitation, so that the phosphorus resources can be fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation and effect of the automated controlled breakpoint chlorination system and process of the present application, the drawings required for the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 It is a schematic diagram of a livestock and poultry breeding wastewater treatment and tail water deep phosphorus removal device of the present invention;

[0038] Figure 2 is a schematic diagram of a solid-liquid separation device of the present invention;

[0039] Figure 3 It is a schematic diagram of the biochemical treatment device for livestock and poultry breeding wastewater of the present invention;

[0040] Figure 4 It is a schematic diagram of the deep phosphorus removal device for livestock and poultry breeding wastewater of the present invention;

[0041] Figure 5 It is a schematic diagram of an adsorption phosphorus removal bed of the livestock and poultry breeding wastewater deep phosphorus removal device of the present invention;

[0042] Figure 6 is a schematic diagram of a sludge dewatering device according to the present invention;

[0043] Figure 7 This is a schematic diagram of a device for producing organic fertilizer using livestock and poultry breeding waste according to the present invention.

[0044] Among them, the corresponding reference numerals in the figure are: 11 collection tank, 12 primary sedimentation tank, 13 lifting pump, 14 solid-liquid separator, 15 dry manure yard; 21, biogas tank, 22 sludge collection tank, 23 biochemical treatment unit, 24 secondary sedimentation tank, 25 coagulation reaction tank, 26 coagulation sedimentation tank; 31 filter, 32 adsorption phosphorus removal bed, 321 adsorption phosphorus removal bed body, 322 aeration pipe, 323 grille, 324 phosphorus removal filler, 325 tank body cover; 41, sludge thickening tank, 42 ​​sludge pump, 43 sludge dewatering machine; 51 loading shovel, 52 hopper, 53 aerobic fermentation bin, 54 deodorization device, 55 silo, 56 crusher and conveyor belt, 57 drum screening machine and 58 packaging machine. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] As used herein, "one embodiment" or "embodiment" refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. The content of the present invention may be more easily understood by referring to the following detailed description of the preferred implementation method of the present invention and the included embodiments. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs. In the event of a conflict, the definitions in this specification shall prevail.

[0047] For the purpose of the following detailed description, it should be understood that the present invention may adopt various alternative changes and step sequences, unless expressly specified to the contrary. In addition, except in any operating examples, or otherwise indicated, all numbers representing the amount of ingredients used in the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and the attached claims are approximate values ​​that vary according to the desired performance to be obtained by the present invention. At least it is not intended to limit the application of the doctrine of equivalents to the scope of the claims, and each numerical parameter should at least be interpreted according to the number of reported significant figures and by applying ordinary rounding techniques.

[0048] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0049] When a numerical range is disclosed herein, the above range is deemed to be continuous and includes the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges included therein. For example, a specified range from "1 to 10" should be deemed to include any and all sub-ranges between a minimum of 1 and a maximum of 10. Exemplary sub-ranges of ranges 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0050] See also Figure 1 A livestock and poultry breeding wastewater treatment and deep phosphorus removal system, the system comprising: a solid-liquid separation device (1), a wastewater treatment device (2), a wastewater deep phosphorus removal device (3) and a sludge treatment device (4).

[0051] See also Figure 2 The solid-liquid separation device is used for solid-liquid separation of livestock and poultry excrement, comprising a collecting tank (11), a primary sedimentation tank (12), a lifting pump (13), a solid-liquid separator (14) and a dry manure pile (15); the water inlet of the collecting tank (11) is connected to the sewage outlet of the breeding farm, the water outlet of the collecting tank (11) is connected to the water inlet of the primary sedimentation tank (12), the collecting tank (11) is used to collect livestock and poultry excrement and livestock and poultry breeding house flushing water, the primary sedimentation tank (13) is used to collect livestock and poultry breeding ... The tank (12) is used for gravity sedimentation and separation of feces; the primary sedimentation tank (12) is a circular or square concrete tank, with a supernatant outlet (16) at the top, the supernatant outlet (16) is connected to the feed port of the biogas tank (21), and a feces sewage outlet is provided at the bottom of the primary sedimentation tank (12), the sewage outlet is connected to the solid-liquid separator (14) through a lifting pump (13), and the feces is separated into solid feces sludge and sewage through the solid-liquid separator (14), and the sewage enters the feed port of the biogas tank (21);

[0052] See also Figure 3The wastewater treatment device comprises a biogas tank (21), a biogas slurry collection tank (22), a biochemical treatment unit (23), a secondary sedimentation tank (24), a coagulation reaction tank (25) and a coagulation sedimentation tank (26) which are connected in sequence; the water inlet of the biogas tank (21) is connected to the water outlet of the solid-liquid separator (14), the water outlet (211) of the biogas tank is connected to the biogas slurry collection tank (22), the water outlet of the biogas slurry collection tank (22) is connected to the water inlet of the biochemical treatment unit (23), and the water outlet (212) of the biogas tank is connected to the water outlet of the solid-liquid separator (14). The water inlet is connected; the biochemical treatment unit is used to further purify and remove pollutants such as COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater, so that the COD of the biochemical effluent is less than 400 mg / L, the BOD is less than 150 mg / L, the ammonia nitrogen is less than 80 mg / L, the total nitrogen is less than 120 mg / L and the suspended solids are less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) are respectively pumped into the sludge concentration tank (41) of the sludge dewatering device (4);

[0053] The biochemical treatment unit comprises at least one aerobic tank, one aerobic tank and one anaerobic tank, or a combination of an anaerobic tank, an aerobic tank, an anaerobic tank and an aerobic tank;

[0054] See also Figure 4 , which is the livestock and poultry breeding wastewater deep phosphorus removal device, used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment device, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and the phosphorus pollution of the livestock and poultry breeding tail water to the natural water body is eradicated. The deep phosphorus removal device is composed of a filter (31) and an adsorption phosphorus removal bed (32); the filter (31) and the adsorption phosphorus removal bed (32) are connected in sequence.

[0055] The filter (31) of the deep dephosphorization device is a precision filter, a rotary microfilter, or a multi-media filter. The water inlet of the filter is connected to the water outlet of the sedimentation tank of the biochemical treatment device; the water outlet of the filter is connected to the water inlet of the adsorption dephosphorization bed of the deep dephosphorization device.

[0056] See also Figure 5 , which is an adsorption dephosphorization bed (32) of the livestock and poultry wastewater deep dephosphorization device, the adsorption dephosphorization bed (32) is composed of a pool body (321), an aeration pipe (322) installed at the bottom of the pool body, a grille (323) installed on the aeration pipe (322), a targeted adsorption dephosphorization filler (324) on the grille, and a pool body cover (325); the aeration pipe (322) of the deep dephosphorization system is connected to an aeration fan.

[0057] The phosphorus removal targeted adsorption filler (324) of the deep phosphorus removal device is a calcium-based expanded filler, which is expanded by using gypsum powder, calcium hydroxide powder, ferric hydroxide powder, cement and cement foaming agent, has a honeycomb porous structure, an average particle size of 3 to 50 mm, and a specific surface area of ​​8 to 10 m 2 / g, bulk density is 410~600kg / m 3 , dry density ≤750kg / m3, cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

[0058] The phosphorus absorption filler (324) of the adsorption dephosphorization bed (32) has a thickness of 1000 to 5000 mm.

[0059] See also Figure 6 The sludge dewatering device comprises a sludge thickening tank (41), a sludge pump (42) and a sludge dewatering machine (43), and the sludge dewatering device (4) is used for dewatering sludge in a wastewater treatment device.

[0060] See also Figure 7 The excrement (sludge) organic fertilizer preparation device comprises a shovel (51), a hopper (52), an aerobic fermentation bin (53), a deodorizing device (54), a bin (55), a pulverizer (56), a drum screening machine (57) and a packaging machine (58).

[0061] A method for treating and deeply removing phosphorus from livestock and poultry breeding wastewater is to utilize the livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to the following steps:

[0062] S1: solid-liquid separation: livestock and poultry manure is collected into a manure collection tank (11), pumped into a sedimentation tank (12) for sedimentation and separation, the supernatant of the sedimentation tank (12) enters a biogas tank (21), and the manure at the bottom of the sedimentation tank (12) enters a solid-liquid separator (13) for dehydration to obtain sludge and sewage with a moisture content of less than 65%; the sludge is sent to a high-temperature aerobic fermentation tank (53) by a forklift (51) for fermentation to produce fertilizer, and the sewage enters the wastewater and is collected in the biogas tank (21);

[0063] S2: Wastewater treatment: The wastewater is collected in a biogas tank (21) for anaerobic fermentation to produce biogas and residual liquid. The residual liquid is injected into a biogas collection tank (22) with a COD of 500-3000 mg / L, a BOD of 200-1600 mg / L, ammonia nitrogen of 400-900 mg / L, and a total phosphorus of 50-90 mg / L. The wastewater then enters a biochemical treatment unit (23) and runs for 24-72 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed by microbial treatment. The wastewater then enters a secondary sedimentation tank (24) for sedimentation and separation, and then enters a coagulation reaction tank (25) and a coagulation sedimentation tank (26) for purification. The coagulation and sedimentation conditions are: PCA dosage is 2% concentration 6L / m 3 , stirring, PAM dosage is 1‰ concentration 3L / m 3 , after purification, COD is less than 200mg / L, BOD is less than 80mg / L, ammonia nitrogen is less than 80mg / L, and total phosphorus is 25-60mg / L;

[0064] S3: Adsorption phosphorus removal: The effluent from the coagulation sedimentation tank (25) of the biochemical treatment device is lifted and enters the filter (31), and the effluent from the filter (31) enters the adsorption phosphorus removal bed (32) for adsorption phosphorus removal. The residence time is not less than 2.5 to 5 hours, and deep phosphorus removal effluent is obtained, wherein the COD is less than 200 mg / L, the BOD is less than 80 mg / L, the ammonia nitrogen is less than 80 mg / L, and the total phosphorus is less than 0.2 mg / L, and the effluent is directly discharged into the drain.

[0065] Preferably, a method for treating livestock and poultry wastewater and deep phosphorus removal also includes a sludge dehydration method, using the above-mentioned sludge dehydration device to dehydrate the sludge according to the following steps:

[0066] S41: Sludge concentration: The biochemical treatment sludge of the residual liquid is input into the sludge concentration tank for gravity concentration to obtain supernatant and concentrated sludge, and the supernatant is pumped into the biochemical treatment device for treatment;

[0067] S42: Dehydration: The concentrated sludge is pumped into a dehydrator by a sludge pump to be dehydrated into sludge and sewage, and then pumped into a biochemical treatment device for treatment.

[0068] Preferably, a method for treating livestock and poultry wastewater and deep phosphorus removal is characterized in that it also includes using the above-mentioned feces (sludge) utilization system to prepare organic fertilizer according to the following steps:

[0069] S51: Fermentation and fertilizer production: The dehydrated solid feces with a water content of less than 65% are sent to the hopper (52) by a shovel (51), and then sent to the fermentation bin (53) from the top of the fermentation bin (53) via (52), and aerobic fermentation is carried out at 50-65°C for 4-7 days, and the material is discharged from the bottom and conveyed to the crusher (54) via a conveyor belt;

[0070] S52: The fertilizer obtained by fermentation in step S51 is conveyed to a pulverizer (54) via a conveyor belt and then pulverized and then sieved on a drum screen (55);

[0071] S53: screening: the fertilizer crushed in step S52 is screened through a drum screen (55) into fertilizer with uniform particle size;

[0072] S54: Packaging: The compost obtained by screening in step S53 is fed into a packaging machine (56) for packaging to obtain finished fertilizer.

[0073] The organic fertilizer produced according to the above steps meets the relevant indicators of Table 1 and Table 2 of the national industry standard "Organic Fertilizer" (NY / T525-2021). The main indicators are shown in Table 1:

[0074] Table 1 Quality index of organic fertilizer

[0075]

[0076] Example 1

[0077] This embodiment is used to illustrate a pig farm wastewater treatment system; the system can be applied to the treatment of pig farm wastewater containing a large amount of organic matter such as feces, urine and leftover feed, while achieving resource utilization of pig farm wastewater and compliance with discharge standards.

[0078] Reference Figure 1 The system comprises a solid-liquid separation device (1), a wastewater treatment device (2), a wastewater deep phosphorus removal device (3), a sludge treatment device (4) and a solid waste (feces) resource utilization system (5).

[0079] See also Figure 2 The solid-liquid separation device is used for solid-liquid separation of livestock and poultry excrement, comprising a collecting tank (11), a primary sedimentation tank (12), a lifting pump (13), a solid-liquid separator (14) and a dry manure pile (15); the water inlet of the collecting tank (11) is connected to the sewage outlet of the breeding farm, the water outlet of the collecting tank (11) is connected to the water inlet of the primary sedimentation tank (12), the collecting tank (11) is used to collect livestock and poultry excrement and livestock and poultry breeding house flushing water, the primary sedimentation tank (13) is used to collect livestock and poultry breeding ... The tank (12) is used for gravity sedimentation and separation of feces; the primary sedimentation tank (12) is a circular or square concrete tank, with a supernatant outlet (16) at the top, the supernatant outlet (16) is connected to the feed port of the biogas tank (21), and a feces sewage outlet is provided at the bottom of the primary sedimentation tank (12), the sewage outlet is connected to the solid-liquid separator (14) through a lifting pump (13), and the feces is separated into solid feces concentrate and liquid through the solid-liquid separator (14), and the liquid enters the feed port of the biogas tank (21);

[0080] See also Figure 3The wastewater biochemical treatment device comprises a biogas tank (21), a biogas slurry collection tank (22), a biochemical treatment tank (23), a secondary sedimentation tank (24), a coagulation reaction tank (25), and a coagulation sedimentation tank (26) which are connected in sequence; the water inlet of the biogas tank (21) is connected to the water outlet of the solid-liquid separation device (1), the water outlet of the biogas tank (21) is connected to the biogas slurry collection tank (22), the water outlet of the biogas slurry collection tank (22) is connected to the water inlet of the aerobic tank (23), the aerobic tank (23) is connected to the secondary sedimentation tank (24), the secondary sedimentation tank (24) is connected to the coagulation reaction tank (25), and the coagulation reaction tank (25) is connected to the secondary sedimentation tank (24). ) is connected to the coagulation sedimentation tank (26); the aerobic tank (23), the secondary sedimentation tank (24), the coagulation reaction tank (25), and the coagulation sedimentation tank (26) are used to further purify pollutants such as COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the residual liquid of the biogas tank (21), so that the COD of the biochemical effluent is less than 400 mg / L, the BOD is less than 150 mg / L, the ammonia nitrogen is less than 80 mg / L, the total nitrogen is less than 120 mg / L and the suspended matter is less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) of the biochemical treatment device are respectively pumped into the primary sedimentation tank (12) of the solid-liquid separation device;

[0081] The biochemical treatment unit is composed of an aerobic pool;

[0082] See also Figure 4 , which is the livestock and poultry breeding wastewater deep phosphorus removal device, used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment device, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and the phosphorus pollution of the livestock and poultry breeding tail water to the natural water body is eradicated. The deep phosphorus removal device is composed of a filter (31) and an adsorption phosphorus removal bed (32); the filter (31) and the adsorption phosphorus removal bed (32) are connected in sequence.

[0083] The filter (31) of the deep dephosphorization device is a precision filter, a rotary microfilter, or a multi-media filter. The water inlet of the filter is connected to the water outlet of the sedimentation tank of the biochemical treatment device; the water outlet of the filter is connected to the water inlet of the adsorption dephosphorization bed of the deep dephosphorization device.

[0084] See also Figure 5 , which is an adsorption dephosphorization bed (32) of the livestock and poultry wastewater deep dephosphorization device, the adsorption dephosphorization bed (32) is composed of a pool body (321), an aeration pipe (322) installed at the bottom of the pool body, a grille (323) installed on the aeration pipe (322), a targeted adsorption dephosphorization filler (324) on the grille, and a pool body cover (325); the aeration pipe (322) of the deep dephosphorization system is connected to an aeration fan.

[0085] The phosphorus removal targeted adsorption filler (324) of the deep phosphorus removal device is a calcium-based expanded filler, which is expanded by using gypsum powder, calcium hydroxide powder, ferric hydroxide powder, cement and cement foaming agent, has a honeycomb porous structure, an average particle size of 3 to 50 mm, and a specific surface area of ​​8 to 10 m 2 / g, bulk density is 410~600kg / m 3 , dry density ≤750kg / m3, cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

[0086] The phosphorus absorption filler (324) of the adsorption dephosphorization bed (32) has a thickness of 5000 mm.

[0087] A method for treating and deeply removing phosphorus from livestock and poultry breeding wastewater is to utilize the livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to the following steps:

[0088] (1) Solid-liquid separation: livestock and poultry manure is collected into a manure collection tank (11), pumped into a sedimentation tank (12) for sedimentation and separation, the supernatant of the sedimentation tank (12) enters a biogas tank (21), and the manure at the bottom of the sedimentation tank (12) enters a solid-liquid separator (13) for dehydration to obtain sludge and sewage with a moisture content of less than 65%; the sludge is sent to a high-temperature aerobic fermentation tank (53) by a forklift (51) for fermentation to produce fertilizer, and the sewage enters the wastewater and is collected into the biogas tank (21);

[0089] (2) Treatment of wastewater: The wastewater is collected in a biogas tank (21) for anaerobic fermentation to produce biogas and residual liquid. The residual liquid is injected into a biogas collection tank (22) with a COD of 500-3000 mg / L, a BOD of 200-1600 mg / L, ammonia nitrogen of 400-900 mg / L, and a total phosphorus of 50-90 mg / L. The wastewater then enters an aerobic tank (23) of a biochemical treatment device and runs for 24-72 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed by microbial treatment. The wastewater then enters a secondary sedimentation tank (24) for sedimentation and separation, and then enters a coagulation reaction tank (25) and a coagulation sedimentation tank (26) for purification. The coagulation and sedimentation conditions are: the PCA dosage is 2% at a concentration of 6 L / m 3 , stirring, PAM dosage is 1‰ concentration 3L / m 3 , after purification, COD is less than 200mg / L, BOD is less than 80mg / L, ammonia nitrogen is less than 80mg / L, and total phosphorus is 25-60mg / L;

[0090] (3) Adsorption phosphorus removal: The effluent from the coagulation sedimentation tank (25) of the biochemical treatment device is lifted and enters the filter (31). The effluent from the filter (31) enters the adsorption phosphorus removal bed (32) for adsorption phosphorus removal. The residence time is not less than 2.5 to 5 hours. Deep phosphorus removal effluent is obtained, and its COD is less than 200 mg / L, BOD is less than 80 mg / L, ammonia nitrogen is less than 80 mg / L, and total phosphorus is less than 0.2 mg / L. It is directly discharged into the drain. The specific indicators are shown in Table 2.

[0091] In this embodiment, the concentrations of various substances in livestock and poultry breeding wastewater and qualified effluent are shown in Table 2.

[0092] Table 2. Inlet and outlet indicators of livestock and poultry breeding wastewater

[0093]

[0094] See also Figure 6 The sludge dewatering device comprises a sludge thickening tank (41), a sludge pump (42) and a sludge dewatering machine (43), and the sludge dewatering device (4) is used for dewatering sludge in a wastewater treatment device.

[0095] Preferably, a method for treating livestock and poultry wastewater and deep phosphorus removal also includes a sludge dehydration method, using the above-mentioned sludge dehydration device to dehydrate the sludge according to the following steps:

[0096] (1) Sludge concentration: The biochemical treatment sludge of the residual liquid is input into the sludge concentration tank for gravity concentration to obtain supernatant and concentrated sludge. The supernatant is pumped into the biochemical treatment device for treatment;

[0097] (2) Dehydration: The concentrated sludge is pumped into a dehydrator by a sludge pump to be dehydrated into sludge and sewage, and then pumped into a biochemical treatment device for treatment.

[0098] See also Figure 7 The excrement (sludge) organic fertilizer preparation device comprises a shovel (51), a hopper (52), an aerobic fermentation bin (53), a deodorizing device (54), a bin (55), a pulverizer (56), a drum screening machine (57) and a packaging machine (58).

[0099] Preferably, a method for treating livestock and poultry wastewater and deep phosphorus removal is characterized in that it also includes using the above-mentioned feces (sludge) utilization system to prepare organic fertilizer according to the following steps:

[0100] (1) Fertilizer production by fermentation: The dehydrated solid feces with a water content of less than 65% are sent to the hopper (52) by a shovel (51), and then sent to the fermentation bin (53) from the top through (52), and aerobic fermentation is carried out at 50-65° C. for 4-7 days, and the material is discharged from the bottom and conveyed to the crusher (54) via a conveyor belt;

[0101] (2) The fertilizer obtained by fermentation in step (1) is conveyed to a pulverizer (54) via a conveyor belt for pulverization, and then enters a drum screen (55) for screening;

[0102] (3) Screening: The fertilizer crushed in step (2) is screened through a drum screen (55) into fertilizer with uniform particle size;

[0103] (4) Packaging: The compost obtained by screening in step (3) is fed into a packaging machine (56) for packaging to obtain finished fertilizer.

[0104] The organic fertilizer produced according to the above steps meets the relevant indicators of Table 1 and Table 2 of the national industry standard "Organic Fertilizer" (NY / T525-2021).

[0105] Example 2

[0106] The piggery wastewater treatment system provided in this embodiment is basically the same as that in embodiment 1, except that:

[0107] See also Figure 3 The wastewater biochemical treatment device comprises a biogas tank (21), a biogas slurry collection tank (22), a biochemical treatment tank (23), a secondary sedimentation tank (24), a coagulation reaction tank (25), and a coagulation sedimentation tank (26) which are connected in sequence; the water inlet of the biogas tank (21) is connected to the water outlet of the solid-liquid separation device (1), the water outlet of the biogas tank (21) is connected to the biogas slurry collection tank (22), the water outlet of the biogas slurry collection tank (22) is connected to the water inlet of the aerobic tank (23), the aerobic tank (23) is connected to the secondary sedimentation tank (24), the secondary sedimentation tank (24) is connected to the coagulation reaction tank (25), and the coagulation reaction tank (25) is connected to the secondary sedimentation tank (24). ) is connected to the coagulation sedimentation tank (26); the aerobic tank (23), the secondary sedimentation tank (24), the coagulation reaction tank (25), and the coagulation sedimentation tank (26) are used to further purify pollutants such as COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the residual liquid of the biogas tank (21), so that the COD of the biochemical effluent is less than 400 mg / L, the BOD is less than 150 mg / L, the ammonia nitrogen is less than 80 mg / L, the total nitrogen is less than 120 mg / L and the suspended matter is less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) of the biochemical treatment device are respectively pumped into the primary sedimentation tank (12) of the solid-liquid separation device;

[0108] The biochemical treatment unit is composed of an anaerobic tank and an aerobic tank;

[0109] See also Figure 5The deep phosphorus removal device 3 is used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment device, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and the phosphorus pollution of livestock and poultry breeding tail water to natural water bodies is eradicated. The deep phosphorus removal device 3 is composed of a filter (51) and an adsorption phosphorus removal bed (52); the filter (51) and the adsorption phosphorus removal bed (52) are connected in sequence.

[0110] The filter (51) of the deep dephosphorization device is a rotary microfilter, the water inlet of the filter is connected to the water outlet of the sedimentation tank of the biochemical treatment device; the water outlet of the filter is connected to the water inlet of the adsorption dephosphorization bed of the deep dephosphorization device.

[0111] The adsorption dephosphorization bed (32) of the deep dephosphorization device for livestock and poultry wastewater is composed of a tank body (321), an aeration pipe (322) installed at the bottom of the tank body, a grille (323) installed on the aeration pipe (322), a targeted adsorption dephosphorization filler (324) on the grille, and a tank body cover (325); the aeration pipe (322) of the deep dephosphorization system is connected to an aeration fan.

[0112] The phosphorus removal targeted adsorption filler (324) of the deep phosphorus removal device is a calcium-based expanded filler, which is expanded by using gypsum powder, calcium hydroxide powder, ferric hydroxide powder, cement and cement foaming agent, has a honeycomb porous structure, an average particle size of 3 to 50 mm, and a specific surface area of ​​8 to 10 m 2 / g, bulk density is 410~600kg / m 3 , dry density ≤750kg / m 3 , cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

[0113] The thickness of the phosphorus absorption filler of the adsorption dephosphorization bed (32) is 3000 mm.

[0114] The effluent indicators after adsorption and phosphorus removal are shown in Table 3.

[0115] Table 3. Livestock and poultry breeding wastewater

[0116]

[0117] Example 3

[0118] The piggery wastewater treatment system provided in this embodiment is basically the same as that in embodiment 1, except that:

[0119] See also Figure 3The wastewater biochemical treatment device comprises a biogas tank (21), a biogas slurry collection tank (22), a biochemical treatment tank (23), a secondary sedimentation tank (24), a coagulation reaction tank (25), and a coagulation sedimentation tank (26) which are connected in sequence; the water inlet of the biogas tank (21) is connected to the water outlet of the solid-liquid separation device (1), the water outlet of the biogas tank (21) is connected to the biogas slurry collection tank (22), the water outlet of the biogas slurry collection tank (22) is connected to the water inlet of the aerobic tank (23), the aerobic tank (23) is connected to the secondary sedimentation tank (24), the secondary sedimentation tank (24) is connected to the coagulation reaction tank (25), and the coagulation reaction tank (25) is connected to the secondary sedimentation tank (24). ) is connected to the coagulation sedimentation tank (26); the aerobic tank (23), the secondary sedimentation tank (24), the coagulation reaction tank (25), and the coagulation sedimentation tank (26) are used to further purify pollutants such as COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the residual liquid of the biogas tank (21), so that the COD of the biochemical effluent is less than 400 mg / L, the BOD is less than 150 mg / L, the ammonia nitrogen is less than 80 mg / L, the total nitrogen is less than 120 mg / L and the suspended matter is less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) of the biochemical treatment device are respectively pumped into the primary sedimentation tank (12) of the solid-liquid separation device;

[0120] The biochemical treatment unit is composed of an anaerobic tank, an aerobic tank and an anaerobic tank combined with an aerobic tank;

[0121] See also Figure 5 The deep phosphorus removal device 3 is used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment device, so that the total phosphorus concentration of the discharged water is less than 0.12 mg / L, and the phosphorus pollution of livestock and poultry breeding tail water to natural water bodies is eradicated. The deep phosphorus removal device 3 is composed of a filter (51) and an adsorption phosphorus removal bed (52); the filter (51) and the adsorption phosphorus removal bed (52) are connected in sequence.

[0122] The filter (51) of the deep dephosphorization device is a multi-media filter, the water inlet of the filter is connected to the water outlet of the sedimentation tank of the biochemical treatment device; the water outlet of the filter is connected to the water inlet of the adsorption dephosphorization bed of the deep dephosphorization device.

[0123] The adsorption dephosphorization bed (32) of the deep dephosphorization device for livestock and poultry wastewater is composed of a tank body (321), an aeration pipe (322) installed at the bottom of the tank body, a grille (323) installed on the aeration pipe (322), a targeted adsorption dephosphorization filler (324) on the grille, and a tank body cover (325); the aeration pipe (322) of the deep dephosphorization system is connected to an aeration fan.

[0124] The phosphorus removal targeted adsorption filler (324) of the deep phosphorus removal device is a calcium-based expanded filler, which is expanded by using gypsum powder, calcium hydroxide powder, ferric hydroxide powder, cement and cement foaming agent, has a honeycomb porous structure, an average particle size of 3 to 50 mm, and a specific surface area of ​​8 to 10 m 2 / g, bulk density is 410~600kg / m 3 , dry density ≤750kg / m 3 , cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

[0125] The thickness of the phosphorus absorption filler of the adsorption dephosphorization bed (32) is 1000 mm.

[0126] The effluent indicators after adsorption and phosphorus removal are shown in Table 4.

[0127] Table 4. Livestock and poultry breeding wastewater

[0128]

[0129] Example 4

[0130] This embodiment provides a method for treating piggery wastewater. In this embodiment, the treatment system provided in Example 1 is used to treat a piggery wastewater with a daily output of about 100m 3 / d Pig wastewater treatment, specifically including the following steps:

[0131] (1) Solid-liquid separation: The pig farming wastewater is precipitated using a liquid separation device to obtain wastewater and sludge;

[0132] (2) Wastewater treatment: Wastewater is collected in a biogas tank for fermentation. The generated biogas and residual liquid are injected into the biogas collection tank. Its COD is 500mg / L, BOD is 200mg / L, ammonia nitrogen is 400mg / L, and total phosphorus is 40mg / L. It then enters the aerobic tank of the biochemical treatment device and aerates for 24 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed through aerobic microbial treatment. Then it enters the sedimentation tank for sedimentation and separation, and then enters the coagulation sedimentation tank for purification. The coagulation sedimentation conditions are: PCA dosage is 2% concentration 6L / m 3 , stirring, PAM dosage is 1‰ concentration 3L / m 3 , after purification, COD is less than 200mg / L, BOD is less than 80mg / L, ammonia nitrogen is less than 80mg / L, and total phosphorus is 25-60mg / L;

[0133] (3) Adsorption phosphorus removal: The effluent from the coagulation sedimentation tank of the biochemical treatment device is lifted and enters the filter. The effluent from the filter enters the adsorption phosphorus removal bed for adsorption phosphorus removal. The residence time is not less than 2.5 to 5 hours. Deep phosphorus removal effluent is obtained, and its COD is less than 100 mg / L, BOD is less than 20 mg / L, ammonia nitrogen is less than 20 mg / L, and total phosphorus is less than 0.5 mg / L, and it is directly discharged into the drain. The specific indicators of the effluent are shown in Table 5.

[0134] Table 5. Livestock and poultry breeding wastewater

[0135]

[0136] See also Figure 6 The livestock and poultry breeding wastewater treatment and deep phosphorus removal system also includes a feces (sludge) utilization system 4, and the feces (sludge) utilization system 4 includes a sludge concentration tank 71, a dewatering machine 72, an aerobic fermentation bin 73, and a packaging machine 74.

[0137] A method for utilizing livestock and poultry excrement (sludge), which utilizes the excrement (sludge) utilization system according to the following steps:

[0138] (1) Fertilizer production by fermentation: The dehydrated solid feces with a water content of less than 65% are fed into the fermentation bin from the top, aerobically fermented at 50-65°C for 4-7 days, and discharged from the bottom and transported to the crusher via a conveyor belt;

[0139] (2) The fertilizer obtained by fermentation in step (1) is conveyed to a pulverizer via a conveyor belt for pulverization, and then enters a drum screening machine;

[0140] (3) Screening: The fertilizer crushed in step (2) is screened by a drum to obtain fertilizer with uniform particle size;

[0141] (4) Packaging: The compost obtained by screening in step (3) is packaged to obtain finished fertilizer.

[0142] The organic fertilizer produced according to the above steps meets the relevant indicators of Table 1 and Table 2 of the national industry standard "Organic Fertilizer" (NY / T525-2021).

[0143] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

[0144] It should be noted that the selection of materials and experimental parameters involved in the above embodiments is only for better obtaining control experimental results, so as to better reflect the beneficial effects of the present application in improving livestock and poultry wastewater treatment and deep phosphorus removal systems and treatment methods. It is only used as a specific feasible embodiment. The materials and parameters that can be actually implemented in this application are not limited to those in the embodiments, and the specific range in the implementation method can be referred to.

[0145] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A livestock and poultry wastewater treatment and deep phosphorus removal system, characterized in that: It comprises a solid-liquid separation device (1), a wastewater treatment device (2), a deep phosphorus removal device (3) and a sludge dewatering device (4); The solid-liquid separation device is used for solid-liquid separation of livestock and poultry excrement, and comprises a collecting tank (11), a primary sedimentation tank (12), a lifting pump (13), a solid-liquid separator (14) and a dry manure pile (15); the water inlet of the collecting tank (11) is connected to the sewage outlet of the breeding farm, and the water outlet of the collecting tank (11) is connected to the water inlet of the primary sedimentation tank (12); the collecting tank (11) is used for collecting livestock and poultry excrement and collecting flushing water of livestock and poultry breeding houses The primary sedimentation tank (12) is used for gravity sedimentation and separation of feces; the primary sedimentation tank (12) is a circular or square concrete tank, with a supernatant outlet at the top, the supernatant outlet is connected to the feed port of the biogas tank (21), and a feces sewage outlet is provided at the bottom, the sewage outlet is connected to the solid-liquid separator (14) through a sewage pump, and the feces are separated into solid feces sludge and sewage through the solid-liquid separator (14), and the sewage enters the water inlet of the biogas tank (21); The wastewater treatment device comprises a biogas tank (21), a biogas slurry collection tank (22), a biochemical treatment unit (23), a secondary sedimentation tank (24), a coagulation reaction tank (25) and a coagulation sedimentation tank (26) which are connected in sequence; the water inlet of the biogas tank (21) is connected to the water outlet of the solid-liquid separator (14), the water outlet (211) of the biogas tank is connected to the biogas slurry collection tank (22), the water outlet of the biogas slurry collection tank (22) is connected to the water inlet of the biochemical treatment unit (23); The biochemical treatment unit is used to further purify and remove pollutants such as COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in the wastewater, so that the COD of the biochemical effluent is less than 400 mg / L, the BOD is less than 150 mg / L, the ammonia nitrogen is less than 80 mg / L, the total nitrogen is less than 120 mg / L and the suspended solids are less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) are respectively pumped into the sludge concentration tank (41) of the sludge dewatering device (4); The biochemical treatment unit (23) comprises at least one aerobic tank, one aerobic tank and one anaerobic tank, or a combination of an anaerobic tank, an aerobic tank, an anaerobic tank and an aerobic tank; The deep phosphorus removal device (3) is used to further remove the total phosphorus in the tail water after treatment by the biochemical treatment device (23), so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and the phosphorus pollution of livestock and poultry tail water to natural water bodies is eradicated. The deep phosphorus removal device is composed of a filter (31) and an adsorption phosphorus removal bed (32); the filter (31) and the adsorption phosphorus removal bed (32) are connected in sequence; The sludge dewatering device (4) is used for dewatering sludge in a wastewater treatment device, and comprises a sludge concentration tank (41), a sludge pump (42) and a sludge dewatering machine (43) which are connected in sequence.

2. A livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to claim 1, characterized in that: The filter (31) of the deep dephosphorization device (3) is any one of a precision filter, a rotary microfilter, and a multi-media filter; the water inlet of the filter (31) is connected to the water outlet of the secondary sedimentation tank (24) of the biochemical treatment device; the water outlet of the filter (31) is connected to the water inlet of the adsorption dephosphorization bed (32) of the deep dephosphorization system.

3. A livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to claim 1, characterized in that: The adsorption dephosphorization bed (32) of the deep dephosphorization system (3) is composed of a pool body (321), an aeration pipe (322) installed at the bottom of the pool body, a grille (323) installed on the aeration pipe (322), a targeted adsorption dephosphorization filler (324) on the grille, and a pool body cover (325); the aeration pipe (322) of the deep dephosphorization system is connected to an aeration fan.

4. A livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to claim 1, characterized in that: The targeted adsorption dephosphorization filler (324) of the deep dephosphorization system (3) is a calcium-based expanded filler, which is expanded by using gypsum powder, calcium hydroxide powder, iron oxyhydroxide powder, cement and cement foaming agent, has a honeycomb porous structure, an average particle size of 3 to 50 mm, and a specific surface area of ​​8 to 10 m 2 / g, bulk density is 410~600kg / m 3 , dry density ≤750kg / m 3 , cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

5. A livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to claim 5, characterized in that: The targeted adsorption dephosphorization filler (324) of the adsorption dephosphorization bed (32) has a thickness of 1000 to 5000 mm.

6. The livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to claim 1, characterized in that: The system also includes a feces (sludge) utilization system (5), which includes a shovel (51), a hopper (52), an aerobic fermentation bin (53), a deodorizing device (54), a bin (55), a pulverizer (56), a drum screening machine (57) and a packaging machine (58).

7. A method for treating livestock and poultry wastewater and deep phosphorus removal, characterized in that: The treatment method uses the deep phosphorus removal system for treating piggery wastewater according to any one of claims 1 to 6, and specifically comprises the following steps: S1: solid-liquid separation: livestock and poultry manure is collected into a manure collection tank (11), pumped into a sedimentation tank (12) for sedimentation and separation, the supernatant of the sedimentation tank (12) enters a biogas tank (21), and the manure at the bottom of the sedimentation tank (12) enters a solid-liquid separator (14) for dehydration to obtain sludge and sewage with a moisture content of less than 65%; the sewage enters the wastewater and is collected into the biogas tank (21); S2: Wastewater treatment: The wastewater is collected in a biogas tank (21) for anaerobic fermentation to produce biogas and residual liquid. The residual liquid is injected into a biogas collection tank (22) with a COD of 500-3000 mg / L, a BOD of 200-1600 mg / L, ammonia nitrogen of 400-900 mg / L, and a total phosphorus of 50-90 mg / L. The wastewater then enters an aerobic tank (23) of a biochemical treatment device and runs for 24-72 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed by microbial treatment. The wastewater then enters a secondary sedimentation tank (24) for sedimentation and separation, and then enters a coagulation reaction tank (25) and a coagulation sedimentation tank (26) for purification. The coagulation and sedimentation conditions are: PCA dosage is 2% at a concentration of 6 L / m 3 , stirring, PAM dosage is 1‰ concentration 3L / m 3 , after purification, COD is less than 200mg / L, BOD is less than 80mg / L, ammonia nitrogen is less than 80mg / L, and total phosphorus is 25-60mg / L; S3: Adsorption phosphorus removal: The effluent from the coagulation sedimentation tank (26) of the biochemical treatment device is lifted and enters the filter (31), and the effluent from the filter (31) enters the adsorption phosphorus removal bed (32) for adsorption phosphorus removal. The residence time is not less than 2.5 to 5 hours, and deep phosphorus removal effluent is obtained, wherein the COD is less than 200 mg / L, the BOD is less than 80 mg / L, the ammonia nitrogen is less than 80 mg / L, and the total phosphorus is less than 0.2 mg / L, and the effluent is directly discharged into the drain.

8. The method for treating livestock and poultry breeding wastewater and removing phosphorus in depth according to claim 7, characterized in that: The method also includes a sludge dewatering method, using a sludge dewatering device (4) to dewater the sludge according to the following steps: S41: Sludge concentration: The biochemical treatment sludge of the residual liquid is input into the sludge concentration tank for gravity concentration to obtain supernatant and concentrated sludge, and the supernatant is pumped into the biochemical treatment device for treatment; S42: Dehydration: The concentrated sludge is pumped into a dehydrator by a sludge pump to be dehydrated into sludge and sewage, and then pumped into a biochemical treatment unit (23) for treatment.

9. The method for treating livestock and poultry breeding wastewater and removing phosphorus in depth according to claim 8, characterized in that: The method further comprises utilizing the feces (sludge) utilization system according to claim 6 according to the following steps: S51: Fermentation and fertilizer production: The solid feces sludge with a water content of less than 65% obtained by dehydration of the solid-liquid separator (14) is sent to the hopper (52) by a forklift (51), and then sent to the fermentation bin (53) from the top of the fermentation bin (53) through the hopper (52), and aerobic fermentation is carried out at 50-65° C. for 4-7 days, and the material is discharged from the bottom and conveyed to the crusher (54) via a conveyor belt; S52: The fertilizer obtained by fermentation in step S51 is conveyed to a pulverizer (54) via a conveyor belt and then pulverized and then sieved on a drum screen (55); S53: Screening: The fertilizer crushed in step S52 is screened through a drum screen (55) into fertilizer with uniform particle size; S54: Packaging: The compost obtained by screening in step S53 is fed into a packaging machine (56) for packaging to obtain finished fertilizer.

10. The method for treating livestock and poultry breeding wastewater and removing phosphorus in depth according to claim 9, characterized in that: The compost organic matter is mixed with the sludge in a mass ratio of (5-10):1 and then fermented to produce fertilizer.

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