Livestock and poultry breeding wastewater treatment and deep phosphorus removal system

Abstract

The utility model discloses a treatment and deep phosphorus removal system for livestock and poultry wastewater. The treatment and deep phosphorus removal system specifically comprises a solid-liquid separation device, a wastewater treatment device, a deep phosphorus removal system and a sludge and excrement utilization device, the wastewater treatment and deep phosphorus removal system comprises a biogas digester, a biochemical treatment unit, 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 utility model belongs to the technical field of breeding wastewater treatment, especially relates to a livestock and poultry breeding wastewater treatment and depth phosphorus removal system and treatment method. BACKGROUND

[0002] Livestock and poultry breeding wastewater refers to the wastewater containing a large amount of excrement, urine and residual feed and other organic matters generated in the process of livestock and poultry breeding, and is a special agricultural resource rich in nitrogen, phosphorus and organic matter. Therefore, the existing treatment technology pays more attention to the resource utilization of livestock and poultry breeding wastewater - after the livestock and poultry breeding wastewater is treated by biological methods such as composting, anaerobic biogas production and aerobic treatment and physical methods such as filtration and sedimentation, the surplus liquid after biogas production is applied to farmland irrigation after sedimentation in a biochemical pond.

[0003] However, after the livestock and poultry breeding wastewater is treated by 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, BOD150-800 mg / L, ammonia nitrogen less than 200 mg / L and total phosphorus of 30-80 mg / L. Directly used for irrigating farmland or irrigating forest land for soil absorption, the total phosphorus will eventually accumulate in the soil. When it rains, the accumulated phosphorus will flow into the river with the rainwater, causing the total phosphorus in the river to exceed the standard, which will have a great adverse impact on the environment.

[0004] Through the monitoring of the water quality section of rivers, lakes and reservoirs set by the state and local governments, it is found that the main problem existing in the water quality section is that the total phosphorus exceeds the standard, and many of them recover gradually to normal within one or two days after the water rises due to rain. It is judged that this is caused by the accumulation of total phosphorus in the soil. Therefore, the discharge of total phosphorus in livestock and poultry breeding wastewater should be focused on, and the livestock and poultry breeding wastewater should be deeply purified. Efficient and complete removal of total phosphorus in livestock and poultry breeding wastewater is a difficult problem that must be solved. INVENTION CONTENTS

[0005] In order to solve the above problems and realize the resource utilization of livestock and poultry breeding wastewater and the treatment and deep purification of livestock and poultry breeding wastewater, the application discloses a livestock and poultry breeding wastewater treatment and depth phosphorus removal system, characterized by comprising a solid-liquid separation device, a wastewater treatment device, a depth phosphorus removal system and a sludge dewatering 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 pile; 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 water for flushing livestock and poultry breeding houses, and 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, with a supernatant outlet at the top, the supernatant outlet is connected to the feed inlet of the biogas tank, and a manure sewage outlet is provided at the bottom. The sewage outlet is connected to the solid-liquid separator via a 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 includes a biogas tank, a biogas liquid 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 liquid collection tank, and the water outlet of the biogas liquid 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 from the secondary sedimentation tank and the coagulation sedimentation tank is respectively pumped into the sludge thickening 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 system is used to further remove the total phosphorus in the tail water after treatment by the biochemical treatment unit, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and to eradicate the phosphorus pollution of livestock and poultry tail water to natural water bodies. The deep phosphorus removal system 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. The sludge dewatering device 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 system 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 unit; 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 consists of a tank body, an aeration pipe installed at the bottom of the tank body, a grille installed on the aeration pipe, 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 the aeration fan.

[0013] Preferably, the targeted adsorption phosphorus removal filler of the deep phosphorus removal system 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 adsorption filler of the adsorption phosphorus removal bed has a thickness of 1000 to 5000 mm. Preferably, the sludge dewatering device is used for sludge dewatering in a wastewater treatment plant, and the sludge dewatering device comprises a sludge thickening 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, which includes a shovel, a hopper, an aerobic fermentation bin, a deodorizing device, a silo, a crusher, a drum screening machine and a packaging machine.

[0016] A method for deep phosphorus removal from livestock and poultry wastewater comprises the following steps:

[0017] S1: Solid-liquid separation: Livestock and poultry manure is collected into a manure collection tank and 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 transported by a forklift to a high-temperature aerobic fermentation tank for fermentation to produce fertilizer, and the sewage enters the wastewater collection and is then sent to the biogas tank;

[0018] S2: Wastewater treatment: The wastewater is collected into the biogas tank for anaerobic fermentation to produce biogas and residual liquid. The residual liquid is injected into the liquid collection pool with COD of 500-3000 mg / L, 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 unit and runs for 24-72 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed by microbial treatment. Then it enters the secondary sedimentation tank for sedimentation separation and then enters the coagulation reaction tank and 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;

[0019] S3: Adsorption phosphorus removal: The effluent from the coagulation sedimentation tank of the biological treatment unit 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, 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 breeding wastewater and deep phosphorus removal further includes a sludge dewatering method, using the above-mentioned sludge dewatering device to dewater the sludge according to the following steps:

[0021] 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. The supernatant is pumped into the biochemical treatment unit 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 unit for treatment.

[0023] Preferably, a method for treating livestock and poultry breeding wastewater and deep phosphorus removal is characterized by further comprising using the above-mentioned feces sludge utilization system to prepare organic fertilizer according to the following steps:

[0024] S51: Fertilization: Dehydrated solid feces with a water content of less than 65% are transported to a hopper by a forklift, then fed into a fermentation bin from the top, aerobically fermented at 50-65°C for 4-7 days, discharged from the bottom, and conveyed to a crusher via a conveyor belt;

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

[0026] S53: Screening: The fertilizer crushed in step (2) is screened through a drum screen to obtain 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, compost organic matter and 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 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 have the functions of increasing crop yield, activating crop immune system and improving crop resistance.

[0030] In this application, in order to increase the nitrogen, phosphorus and potassium content in the fertilizer 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, the 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. 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 standards, and also achieves the discharge standards of livestock and poultry breeding wastewater, especially the total phosphorus in the discharged wastewater is purified 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 this application has the following progress and advantages compared with the existing technology:

[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, feces and wastewater, which lead to soil and water pollution and cause the total phosphorus in the polluted water to exceed the standard. The utility model applies the solid-liquid separation of feces into solid feces, and then produces organic fertilizer through high-temperature aerobic fermentation, thereby eliminating feces pollution. At the same time, the wastewater is subjected to biochemical treatment and adsorption dephosphorization, so that the total phosphorus in the effluent is less than 0.2 mg / L, eliminating wastewater pollution, thereby fundamentally solving the problem of livestock and poultry breeding pollution.

[0034] 2. Comprehensive resource utilization is achieved. 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 this application separates the livestock and poultry breeding manure into solid-liquid, and then the solid manure is fermented 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 recycling and utilization of phosphorus resources in wastewater is realized. The phosphorus in the wastewater is adsorbed in the filler through the adsorption dephosphorization bed. After adsorption saturation, the phosphorus resources are recovered through dewashing and precipitation, so that the phosphorus resources are fully utilized. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0037] Figure 1 This is a schematic diagram of a livestock and poultry breeding wastewater treatment and tailwater deep phosphorus removal system of the utility model;

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

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

[0040] Figure 4 This is a schematic diagram of the livestock and poultry breeding wastewater deep phosphorus removal system of the present utility model;

[0041] Figure 5 This is a schematic diagram of the adsorption phosphorus removal bed of the livestock and poultry breeding wastewater deep phosphorus removal system of the present invention.

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

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

[0044] 1 , a sludge thickening tank, a sludge pump, a sludge dewatering machine, a sludge collecting tank, a sludge deodorizing device, a silo, a hopper ... DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any 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 following detailed description of preferred embodiments of the present invention and the included embodiments may facilitate understanding of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. 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 provided otherwise. In addition, except in any operating examples, or when 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 appended 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 considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein. For example, a specified range from "1 to 10" should be considered to include any and all subranges between a minimum of 1 and a maximum of 10. Exemplary subranges of the range 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 system (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 manure, 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 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 manure and livestock and poultry house flushing water, 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 (16) provided at the top, which is connected to the feed port of the biogas tank (21); a feces discharge outlet is provided at the bottom of the primary sedimentation tank (12), which is connected to the solid-liquid separator (14) via a lifting pump (13); the feces are separated into solid feces sludge and sewage by 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 liquid 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 liquid collection tank (22), the water outlet of the biogas liquid collection tank (22) is connected to the inlet of the biochemical treatment unit (23), and the water outlet of the biogas liquid collection tank (22) is connected to the inlet of the biochemical treatment unit (23). The water outlet 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 system, used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment unit, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and to eradicate the phosphorus pollution of the livestock and poultry breeding tail water to the natural water body. The deep phosphorus removal system 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 phosphorus removal system 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 unit; the water outlet of the filter is connected to the water inlet of the adsorption phosphorus removal bed of the deep phosphorus removal system.

[0056] See also Figure 5 , which is an adsorption dephosphorization bed (32) of the livestock and poultry breeding wastewater deep dephosphorization system, the adsorption dephosphorization bed (32) 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.

[0057] The phosphorus removal targeted adsorption filler (324) of the deep phosphorus removal system 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 / m3, cylinder pressure strength ≥3.5MPa, porosity ≥73%, water absorption ≥65%, adsorption capacity 24~28kg / m 3 .

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

[0059] See also Figure 6 The sludge dewatering device comprises a sludge concentration 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 device for preparing organic fertilizer using feces (sludge) includes a shovel (51), a hopper (52), an aerobic fermentation chamber (53), a deodorizing device (54), a silo (55), a crusher (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 utilizes the livestock and poultry breeding wastewater treatment and deeply removing phosphorus 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 into the biogas tank (21);

[0063] S2: Wastewater treatment: The wastewater is collected into the biogas tank (21) for anaerobic fermentation to produce biogas and residual liquid. The residual liquid is injected into the liquid collection tank (22) with COD of 500-3000 mg / L, 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 (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 the secondary sedimentation tank (24) for sedimentation and separation, and then enters the coagulation reaction tank (25) and the 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 unit 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, and deep phosphorus removal effluent is obtained. 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 breeding wastewater and deep phosphorus removal further includes a sludge dewatering method, using the above-mentioned sludge dewatering device to dewater 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. The supernatant is pumped into the biochemical treatment unit 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 unit for treatment.

[0068] Preferably, a method for treating livestock and poultry breeding wastewater and deep phosphorus removal is characterized by further comprising using the above-mentioned feces sludge utilization system to prepare organic fertilizer according to the following steps:

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

[0070] S52: The fertilizer obtained by fermentation in step S51 is conveyed to a crusher (54) via a conveyor belt and crushed, and then enters a drum screen (55) for screening;

[0071] S53: screening: the fertilizer crushed in step S52 is screened through a drum screen (55) into fertilizer of 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 indicators of organic fertilizers

[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 standard discharge.

[0078] Reference Figure 1 The system includes a solid-liquid separation device (1), a wastewater treatment device (2), a wastewater deep phosphorus removal system (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 manure, 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 manure and livestock and poultry breeding house flushing water, the primary sedimentation 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) provided at the top, which is connected to the feed port of the biogas tank (21); a feces discharge outlet is provided at the bottom of the primary sedimentation tank (12), which is connected to the solid-liquid separator (14) via a lifting pump (13); the feces are separated into solid feces concentrate and liquid by 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 unit comprises a biogas tank (21), a biogas liquid 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 separation device (1), the water outlet of the biogas tank (21) is connected to the biogas liquid collection tank (22), the water outlet of the biogas liquid 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 solids are less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) of the biochemical treatment unit are respectively pumped into the primary sedimentation tank (12) of the solid-liquid separation device;

[0081] The biochemical treatment unit consists of an aerobic tank;

[0082] See also Figure 4 , which is the livestock and poultry breeding wastewater deep phosphorus removal system, used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment unit, so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and to eradicate the phosphorus pollution of the livestock and poultry breeding tail water to the natural water body. The deep phosphorus removal system 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 phosphorus removal system 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 unit; the water outlet of the filter is connected to the water inlet of the adsorption phosphorus removal bed of the deep phosphorus removal system.

[0084] See also Figure 5 , which is an adsorption dephosphorization bed (32) of the livestock and poultry breeding wastewater deep dephosphorization system, the adsorption dephosphorization bed (32) 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.

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

[0086] The thickness of the phosphorus adsorption filler (324) of the adsorption phosphorus removal bed (32) is 5000 mm.

[0087] A livestock and poultry breeding wastewater treatment and deep phosphorus removal method is provided, which utilizes the livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to the following steps:

[0088] (1) Solid-liquid separation: collect livestock and poultry breeding manure into a manure collection tank (11), pump into a sedimentation tank (12) for sedimentation 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 dewatering to obtain sludge and wastewater with a water content of less than 65%; the sludge is sent into a high-temperature aerobic fermentation bin (53) by a forklift (51) for fermentation to produce fertilizer, and the wastewater enters the biogas tank (21) for collection;

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

[0090] (3) Adsorption of phosphorus: the effluent from the coagulation sedimentation tank (25) is lifted into the filter (31), and the effluent from the filter (31) is introduced into the adsorption phosphorus removal bed (32) for adsorption of phosphorus, with a residence time of 2.5-5 hours, to obtain deep phosphorus removal effluent with a COD of less than 200 mg / L, a BOD of less than 80 mg / L, an ammonia nitrogen of less than 80 mg / L, and a total phosphorus of less than 0.2 mg / L, which is directly discharged into the drainage outlet. The specific indexes are shown in Table 2.

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

[0092] Table 2. Indexes of livestock and poultry breeding wastewater before and after treatment

[0093]

[0094] Referring to Figure 6 , the sludge dewatering device includes a sludge thickening tank (41), a sludge pump (42), and a sludge dewatering machine (43), and the sludge dewatering device (4) is used for sludge dewatering of the wastewater treatment device.

[0095] Preferably, the method for treating and deeply removing phosphorus from livestock and poultry breeding wastewater further includes a sludge dewatering method, and the sludge dewatering is performed according to the following steps by using the above-mentioned sludge dewatering device:

[0096] (1) Sludge thickening: the biochemical treatment sludge of the residual liquid is input into the sludge thickening tank for gravity thickening to obtain supernatant and thickened sludge, and the supernatant is pumped into the biochemical treatment unit for treatment.

[0097] (2) Dewatering: the thickened sludge is pumped into the dewatering machine by the sludge pump to be dewatered into sludge and wastewater, which are pumped into the biochemical treatment unit for treatment.

[0098] Referring to Figure 7 , the feces (sludge) is used to prepare organic fertilizer by using a preparation organic fertilizer device, which includes a forklift (51), a hopper (52), an aerobic fermentation bin (53), a deodorization device (54), a storage bin (55), a pulverizer (56), a drum screening machine (57), and a packaging machine (58).

[0099] Preferably, the method for treating and deeply removing phosphorus from livestock and poultry breeding wastewater further includes a sludge dewatering method, and the sludge dewatering is performed according to the following steps by using the above-mentioned sludge dewatering device:

[0100] (1) Fermentation for fertilizer preparation: the solid feces with a water content of less than 65% obtained by dewatering is sent into the hopper (52) by the forklift (51), and is sent into the aerobic fermentation bin (53) from the top of the bin (53) to be subjected to aerobic fermentation at 50-65°C for 4-7 days, and is discharged from the bottom to be conveyed to the pulverizer (54) by a conveyor belt.

[0101] (2) The fertilizer obtained by fermentation in step (1) is conveyed to a crusher (54) via a conveyor belt for crushing, 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 of 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 in accordance with the above steps meets the relevant indicators in 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 Example 1, except that:

[0107] See also Figure 3 The wastewater biochemical treatment unit comprises a biogas tank (21), a biogas liquid 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 separation device (1), the water outlet of the biogas tank (21) is connected to the biogas liquid collection tank (22), the water outlet of the biogas liquid 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 solids are less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) of the biochemical treatment unit are respectively pumped into the primary sedimentation tank (12) of the solid-liquid separation device;

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

[0109] See also Figure 5, the depth phosphorus removal system 3 is used for further removing total phosphorus in the wastewater after the biochemical treatment unit, 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 depth phosphorus removal system 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 depth phosphorus removal system is a rotary microfilter, the water inlet of the filter is communicated with the water outlet of the sedimentation tank of the biochemical treatment unit; and the water outlet of the filter is communicated with the water inlet of the adsorption phosphorus removal bed of the depth phosphorus removal system.

[0111] The adsorption phosphorus removal bed (32) of the depth phosphorus removal system of the livestock and poultry breeding wastewater, the adsorption phosphorus removal bed (32) is composed of a tank body (321), an aeration pipe (322) installed at the bottom of the tank body, a grid (323) installed on the aeration pipe (322), a targeted adsorption phosphorus removal filler (324) above the grid and a tank body cover plate (325); the aeration pipe (322) of the depth phosphorus removal system is connected with an aeration fan.

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

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

[0114] The effluent indexes after the adsorption phosphorus removal are shown in Table 3.

[0115] Table 3. Livestock and poultry breeding wastewater

[0116]

[0117] Example 3

[0118] The pig breeding wastewater treatment system provided in the embodiment is basically the same as that in example 1, and the difference lies in that:

[0119] Referring to Figure 3The wastewater biochemical treatment unit comprises a biogas tank (21), a biogas liquid 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 separation device (1), the water outlet of the biogas tank (21) is connected to the biogas liquid collection tank (22), the water outlet of the biogas liquid 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 solids are less than 200 mg / L; the sludge in the secondary sedimentation tank (24) and the coagulation sedimentation tank (26) of the biochemical treatment unit 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, an aerobic tank;

[0121] See also Figure 5 The deep phosphorus removal system 3 is used to further remove the total phosphorus in the wastewater after treatment by the biochemical treatment unit, so that the total phosphorus concentration of the discharged water is less than 0.12 mg / L, and to eradicate the phosphorus pollution of livestock and poultry breeding tail water to natural water bodies. The deep phosphorus removal system 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 phosphorus removal system 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 unit; the water outlet of the filter is connected to the water inlet of the adsorption phosphorus removal bed of the deep phosphorus removal system.

[0123] The adsorption dephosphorization bed (32) of the livestock and poultry breeding wastewater deep dephosphorization system comprises 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 system 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 .

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

[0126] The effluent indicators after adsorption 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 piggery wastewater with a daily output of about 100m 3 / d Pig farm wastewater treatment, specifically including the following steps:

[0131] (1) Solid-liquid separation: Use a liquid separation device to precipitate the piggery wastewater to obtain wastewater and sludge;

[0132] (2) Wastewater treatment: The wastewater is collected into a biogas tank for fermentation. The generated biogas and residual liquid are injected into the liquid collection tank with COD of 500mg / L, BOD of 200mg / L, ammonia nitrogen of 400mg / L, and total phosphorus of 40mg / L. The wastewater then enters the aerobic tank of the biochemical treatment unit and is aerated for 24 hours. The COD, BOD, ammonia nitrogen and other pollutants in the wastewater are further removed by aerobic microbial treatment. The wastewater then 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 and sedimentation tank of the biochemical treatment unit is lifted and fed into the filter. The effluent from the filter enters the adsorption phosphorus removal bed for adsorption phosphorus removal. The residence time is 2.5 to 5 hours. The effluent is deeply dephosphorized and has a COD of less than 100 mg / L, a BOD of less than 20 mg / L, ammonia nitrogen of less than 20 mg / L, and total phosphorus of less than 0.5 mg / L. The effluent is then discharged directly 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 dehydrator 72, an aerobic fermentation bin 73, and a packaging machine 74.

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

[0138] (1) Fermentation fertilizer production: The dehydrated solid feces with a water content of less than 65% are fed into the fermentation tank 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 crusher via a conveyor belt and crushed, and then enters a drum screening machine;

[0140] (3) Screening: The fertilizer crushed in step (2) is passed through a drum screening machine to form 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 in accordance with the above steps meets the relevant indicators in 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 can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose 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 the purpose of better obtaining control experimental results, so as to better reflect the beneficial effects of this application in improving livestock and poultry breeding 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 merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A livestock and poultry breeding wastewater treatment and deep phosphorus removal system, characterized in that: It includes a solid-liquid separation device (1), a wastewater treatment device (2), a deep phosphorus removal system (3) and a sludge dewatering device (4); The solid-liquid separation device is used for solid-liquid separation of livestock and poultry manure, 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 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 manure and collecting flushing water for livestock and poultry 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 by 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 liquid 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 liquid collection tank (22), and the water outlet of the biogas liquid 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 COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus pollutants 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 system (3) is used to further remove the total phosphorus in the tail water after treatment by the biochemical treatment unit (23), so that the total phosphorus concentration of the discharged water is less than 0.2 mg / L, and to eradicate the phosphorus pollution of the livestock and poultry breeding tail water to the natural water body. The deep phosphorus removal system 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) 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 phosphorus removal system (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 unit; the water outlet of the filter (31) is connected to the water inlet of the adsorption phosphorus removal bed (32) of the deep phosphorus removal system.

3. The 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 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.

4. The 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 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. The livestock and poultry breeding wastewater treatment and deep phosphorus removal system according to claim 3, 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 further includes a fecal sludge utilization system (5), which includes a shovel (51), a hopper (52), an aerobic fermentation bin (53), a deodorizing device (54), a silo (55), a crusher (56), a drum screening machine (57), and a packaging machine (58).

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