CN112047576A - Device for removing resistance genes and nitrogen and phosphorus in wastewater of livestock and poultry farm and operation process thereof - Google Patents
Device for removing resistance genes and nitrogen and phosphorus in wastewater of livestock and poultry farm and operation process thereof Download PDFInfo
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- CN112047576A CN112047576A CN202010945961.5A CN202010945961A CN112047576A CN 112047576 A CN112047576 A CN 112047576A CN 202010945961 A CN202010945961 A CN 202010945961A CN 112047576 A CN112047576 A CN 112047576A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 42
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- 239000002351 wastewater Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 33
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 22
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention provides a device for removing resistance genes and nitrogen and phosphorus in wastewater of a livestock and poultry farm and an operation process thereof. The method mainly comprises the steps of dry-wet separation, grid interception, iron-carbon micro-electrolysis pretreatment, microbial agent enhanced biological treatment, Fenton oxidation process, secondary precipitation and artificial wetland treatment of animal manure and urine in the livestock and poultry farm, so that the resistance genes and nitrogen and phosphorus removal in sewage are effectively removed, the harm of daily pollutant discharge of the livestock and poultry farm to the surrounding environment is reduced, and particularly the influence on the water environment is reduced.
Description
Technical Field
The invention belongs to the technical field of water treatment environment, and particularly relates to a device for removing resistance genes, nitrogen and phosphorus in wastewater of a livestock and poultry farm and an operation process thereof.
Background
For the needs of preventing and treating germs and promoting animal development, antibiotics are generally added into feed, the antibiotics which are not metabolized by organisms and remain in organisms are accumulated continuously, and the antibiotics excreted by the organisms and the antibiotics in baits which are not utilized by the organisms are excreted along with urine and excrement. If discharged into the environment without proper disposal, these excreta can cause resistance of the environment to antibiotics by microorganisms, and the resistance genes are transmitted in the ecological environment, especially in the water environment, through various horizontal transfer mechanisms including binding, transduction, and natural transformation, which pose a threat to public safety and food health.
With the intensive, large-scale and industrial development of livestock and poultry industry in China, the scales of excrement and urine produced every day are quite remarkable, but the development has regional difference and individual difference, a part of farms lack perfect sewage treatment processes and facilities, the management is backward, the efficiency is low, and the quality of effluent water cannot meet basic requirements. This is related to the awareness of personnel, economic investment, and the skill level. The existing method for treating wastewater in partial farms mainly treats wastewater through the traditional process, and the process measures cannot effectively control the spread of the resistance genes but have the risk of aggravating the spread of the resistance genes in the environment. According to the characteristics of the sewage of the farm, the treatment process needs to keep removing high-concentration COD, nitrogen and phosphorus pollutants in the wastewater and simultaneously needs to adopt a sterilization mode to ensure the removal effect of the resistance genes in the effluent, and the whole process needs to realize safety, simplicity, operability and economy.
CN201710310838.4 discloses a method for removing antibiotic resistance genes in livestock and poultry breeding wastewater, which removes Antibiotic Resistance Genes (ARGs) in the livestock and poultry breeding wastewater by a coagulating sedimentation-free radical oxidation combined process. Firstly, adding a coagulant into the livestock and poultry breeding wastewater to carry out coagulation operation, and precipitating after the coagulation is finished to separate out the supernatant of the livestock and poultry breeding wastewater; then adding Fe and peroxydisulfate or peroxymonosulfate into the supernatant to excite free radicals, and oxidizing and removing resistance genes in the water sample by the free radicals; the removal rate of the ARGs in the livestock and poultry breeding wastewater by the combined coagulating sedimentation and free radical oxidation process can reach 1-6 log units. The method is simple to operate, has low economic cost, and can effectively remove antibiotic resistance genes in the livestock and poultry breeding wastewater. The invention does not determine whether to treat nitrogen, phosphorus, COD, BOD and the like in the subsequent treatment of the coagulating sedimentation, can not ensure the national standard of wastewater discharge, and is easy to pollute the environment.
CN201210086161.8 the peroxyacetic acid adopted in the disinfection treatment of the invention has certain toxicity and strong corrosivity, has strong irritation to skin and eyes, can cause serious burn to skin, has operation danger and simultaneously has corrosivity to metal equipment. The materials and devices such as high-pressure CO2, nano titanium dioxide and the like have high cost and large energy consumption, and are not beneficial to popularization and utilization.
Disclosure of Invention
In order to achieve the purpose, the invention provides a device and a method for removing resistance genes, nitrogen and phosphorus in wastewater of livestock and poultry farms, which can effectively remove traditional organic pollutants, nitrogen and phosphorus, and can also effectively remove resistance genes to protect the ecological environment of the surrounding water body.
A device for removing resistance genes and nitrogen and phosphorus in wastewater of a livestock and poultry farm treats animal excrement liquid and urine of the livestock and poultry farm through a set of flow process including dry-wet separation, grid interception, iron-carbon micro-electrolysis pretreatment, microbial agent enhanced biological treatment, Fenton oxidation process, secondary precipitation and artificial wetland, so that the resistance genes and the nitrogen and phosphorus in the wastewater are effectively removed, the harm of daily pollutant discharge of the livestock and poultry farm to the surrounding environment is reduced, and particularly the influence on the water environment is reduced.
Particularly, the system comprises a water inlet part, an iron-carbon pretreatment tank, a biochemical treatment tank, a secondary sedimentation tank and an artificial wetland which are connected in sequence.
Wherein, the water inlet part comprises a solid-liquid separator, a urine collecting pipeline and a water inlet pipeline. The water inlet pipeline is connected to the iron-carbon pretreatment tank;
the iron-carbon pretreatment tank comprises a trash rack, iron-carbon fillers, an aeration device and a drain outlet, wherein the drain outlet is arranged at the bottom of the iron-carbon pretreatment tank, the iron-carbon fillers are filled in the iron-carbon pretreatment tank, and the aeration device is arranged at the top of the iron-carbon pretreatment tank.
The biochemical treatment tank comprises an anaerobic reaction chamber and an aerobic reaction chamber which are arranged side by side, the top of the anaerobic reaction chamber 9 is provided with a microbial agent adding system, and the bottom of the aerobic reaction chamber 12 is provided with an aeration system;
the top of the second-stage sedimentation tank is provided with H2O2And the bottom of the dosing system is connected with a sludge flow pump, an output pipeline connected with a reflux pump is connected to the anaerobic reaction chamber, and sludge in the secondary sedimentation tank flows back to the anaerobic reaction chamber through the reflux pump.
The artificial wetland E comprises a substrate, wetland plants are planted on the substrate, and a water outlet pipeline is arranged on the side wall of the upper part of the substrate.
An operation process of a device for removing resistance genes and nitrogen and phosphorus in wastewater of a livestock and poultry farm comprises the following steps:
(1) in the water inlet part, collected liquid dung and waste water from the urine collecting pipeline 2 are collected into a water inlet pipeline through a solid-liquid separator and flow into an iron-carbon pretreatment tank.
(2) In the iron-carbon pretreatment pond, the dirty grid is blocked at first to the inflow of flowing through of intaking, holds back residue and big suspended solid in the sewage, then upwards flows in from the bottom of iron-carbon pretreatment pond, along with the iron-carbon filler of the rising of water level flow through, through aeration equipment's aeration and the iron-carbon micro-electrolysis of iron-carbon filler 5, decomposes the organic matter, reduces COD, and the flow direction of sewage in iron-carbon pretreatment pond is from the bottom up, from the front to the back, enters into biochemical reaction pond from high water level play water afterwards.
(3) In the biochemical reaction tank, water flow firstly enters the anaerobic reaction tank, a microbial agent is added through a microbial agent adding system, the biological treatment effect is enhanced, macromolecular organic matters in sewage are further removed, a valve on a partition wall between the anaerobic reaction chamber and the aerobic reaction chamber is closed when the sewage is not treated, and the anaerobic condition of the anaerobic chamber is kept. The sewage after the reaction in the anaerobic chamber enters the aerobic reaction chamber, and the aeration of the bottom aeration system accelerates the nitrification of microorganisms to remove ammonia nitrogen. The sewage of the aerobic reaction chamber is discharged from a high water level and then enters a secondary sedimentation tank.
(4) In a secondary sedimentation tank, adding H2O2And the sunThe light irradiation generates Fenton reaction to generate free radicals with high oxidizability, and the free radicals oxidize to kill bacteria and remove resistance genes in sewage. Meanwhile, the sludge in the secondary sedimentation tank flows back to the anaerobic reaction chamber 9 through a reflux pump, and the nitrate nitrogen generated by nitrification is removed by using the denitrification of anaerobic bacteria. And finally, the supernatant in the secondary sedimentation tank enters the vertical subsurface flow constructed wetland from the upper part.
(5) In the artificial wetland, the water quality is further purified through substrate adsorption and wetland plant absorption, and the resistance genes dissociated in the water body are removed.
The artificial wetland comprises a substrate, a plurality of layers of artificial wetland and a plurality of layers of artificial wetland, wherein the substrate comprises a cobble layer, a middle gravel layer, a fine gravel layer and a sand stone layer from bottom to top, and consists of different porous medium; 2 plants of reed and cattail are planted in the wetland
The beneficial technical effects of the invention are as follows:
(1) the traditional sewage treatment process is combined with the advanced oxidation process, so that the traditional organic pollutants, nitrogen, phosphorus and the like can be removed, the effluent can meet the national sewage treatment discharge standard, a novel pollutant-resistance gene can be removed, and the ecological environment of the surrounding water body is protected.
(2) Reasonable treatment flow, high treatment efficiency, convenient construction, moderate economy, simple operation and management and stable operation, and is suitable for the ecological environment and the management operation mode of rural farms.
Drawings
In order to more intuitively and clearly illustrate the embodiments or process flows and technical solutions of the present invention, the following brief description of the drawings, which are required for describing the present invention, will be made: the structure of the invention adopts C30 reinforced concrete material, thus ensuring the stability and durability of the structure; the actual size of each treatment unit needs to be determined on site according to the sewage treatment scale of a farm, the ground environment and the like, and the invention only provides a general structural schematic diagram; the processing units are connected through steel pipes or reinforced concrete pipes, the size of the connecting pipe is correspondingly determined according to the actual size of the processing units, a socket is adopted in the pipe orifice connecting part, and water stopping measures are taken. The construction and operation process complies with the acceptance criteria for construction quality of concrete structure engineering GB 50204-2002.
FIG. 1 is a schematic of the process flow and structure of the present invention.
Fig. 2 is a schematic structural view of the artificial wetland.
Wherein the water inlet part-A, the iron-carbon pretreatment tank-B, the biochemical treatment tank-C, the secondary sedimentation tank-D and the artificial wetland-E. A solid-liquid separator-1, a urine collecting pipeline-2, a water inlet pipeline-3, a trash rack-4, iron carbon filler-5, an aeration device 7, a sewage outlet-8, an anaerobic reaction chamber-9, an aerobic reaction chamber-12, a microbial agent feeding system-10, an aeration system 13, and H2O2A dosing system-14, a sludge flow pump-15, a substrate-16, a water outlet pipeline-17, wetland plants-18, a gravel layer-19, a fine gravel layer 20, a medium gravel layer 21 and a cobblestone layer 22.
Detailed Description
The technical solution of the present invention is described in detail below with reference to examples, but the present invention is not limited to the examples.
FIG. 1 is a schematic process flow diagram of the present invention. Fig. 2 is a schematic structural view of the artificial wetland. Referring to fig. 1-2, the device for removing the resistance genes and nitrogen and phosphorus in the wastewater of the livestock and poultry farm comprises a water inlet part A, an iron-carbon pretreatment tank B, a biochemical treatment tank C, a secondary sedimentation tank D and an artificial wetland E which are sequentially connected.
Wherein, the water inlet part A comprises a solid-liquid separator 1, a urine collecting pipeline 2 and a water inlet pipeline 3.
Iron and carbon pretreatment tank B, including trash rack 4, iron and carbon filler 5, aeration equipment 7, drain 8, wherein drain 8 sets up in iron and carbon pretreatment tank B's bottom, and iron and carbon filler 5 fills in iron and carbon pretreatment tank, and aeration equipment 7 sets up the top at iron and carbon pretreatment tank. The trash rack is made of corrosion-resistant materials, and the specification and size of meshes meet the requirements of intercepting residues and large suspended particles in water.
The biochemical treatment tank C comprises an anaerobic reaction chamber 9 and an aerobic reaction chamber 12 which are arranged side by side, wherein the top of the anaerobic reaction chamber 9 is provided with a microbial agent adding system 10, and the bottom of the aerobic reaction chamber 12 is provided with an aeration system 13.
The top of the second-stage sedimentation tank D is provided with H2O2And the bottom of the adding system (14) is connected with a sludge flow pump 15, an output pipeline connected with a reflux pump is connected to the anaerobic reaction chamber 9, and sludge in the secondary sedimentation tank flows back to the anaerobic reaction chamber 9 through the reflux pump.
The artificial wetland E comprises a substrate 16, wetland plants 18 are planted on the substrate 16, and a water outlet pipeline (17) is arranged on the upper side wall.
The operation process comprises the following steps:
(1) in the water inlet part A, collected liquid dung and waste water from the urine collecting pipeline 2 are collected into a water inlet pipeline 3 through a solid-liquid separator 1 and flow into an iron-carbon pretreatment pool B.
(2) In iron-carbon pretreatment pond B, the waste water first flows through trash rack 4, holds back the residue and the big suspended solid in the sewage, then flows in from the bottom of iron-carbon pretreatment pond upwards, along with the iron-carbon filler of the rising flow through of water level, through aeration equipment 7's aeration and the little electrolysis of iron-carbon filler 5, decomposes the organic matter, reduces COD, and the flow direction of sewage in iron-carbon pretreatment pond is from the bottom up, from the front to the back, goes out the water from high water level afterwards and enters into the biochemical reaction pond.
The iron-carbon filler comprises scrap iron and biochar, the mass ratio of the iron to the carbon is 4-5: 1, and the scrap iron is used in 10% NaOH solution and 5% H solution for the first time2SO4Soaking the biological carbon in the solution for 1 hour, and cleaning the biological carbon with clear water, wherein the biological carbon is obtained by pyrolysis of local agricultural wastes and is in the shape of cylindrical particles, the diameter of the cross section of the biological carbon is 1-2 cm, and the length of the biological carbon is 3-5 cm; the device (7) is an aeration device, the aeration mode is continuous aeration, and the aeration time is the treatment time of the system every day; the device (8) is a sewage draining outlet and discharges sewage regularly according to the sludge production efficiency.
(3) In the biochemical reaction tank, water flow firstly enters an anaerobic reaction tank, a microbial agent is added through a microbial agent adding system 10 to enhance the biological treatment effect and further remove macromolecular organic matters in sewage, a valve 11 on a partition wall between an anaerobic reaction chamber 9 and an aerobic reaction chamber 12 is closed when sewage is not treated, and the anaerobic condition of the anaerobic chamber is kept. The sewage after the reaction in the anaerobic chamber enters the aerobic reaction chamber 12, and the nitrification of microorganisms is accelerated by the aeration of the bottom aeration system 13 to remove ammonia nitrogen. The sewage of the aerobic reaction chamber is discharged from a high water level and then enters a secondary sedimentation tank.
The aeration device 13 performs intermittent aeration, and the aeration mode is that the aeration is performed once every 1h and lasts for 1 h.
(4) In a secondary sedimentation tank D, by adding H2O2And the Fenton reaction is carried out under the irradiation of sunlight to generate free radicals with high oxidizability, so that bacteria are killed by oxidation, and resistance genes in sewage are removed. Meanwhile, the sludge in the secondary sedimentation tank flows back to the anaerobic reaction chamber 9 through a reflux pump, and the nitrate nitrogen generated by nitrification is removed by using the denitrification of anaerobic bacteria. And finally, the supernatant in the secondary sedimentation tank enters the vertical subsurface flow constructed wetland from the upper part.
(5) In the artificial wetland E, the wetland adopts a vertical undercurrent type, the water quality is further purified by the adsorption of the substrate 16 and the absorption of wetland plants 18, the resistance genes dissociated in the water body are removed, and finally the obtained effluent can reach the discharge standard.
Example 1
A complete sewage treatment facility is built in a certain farm in Nanjing, Jiangsu according to the invention, and the cow dung liquid and the urine are subjected to harmless and safe treatment. The daily sewage treatment scale of the existing farm is 200m3COD, ammonia Nitrogen (NH) in the wastewater4 +-N), Total Phosphorus (TP), suspended matter (SS) is high, and specific water quality is shown in Table 1 (average value, mg. L)-1)：
TABLE 1
The antibiotic types used in the farm are tetracycline (tet) and sulfonamide (sul) antibiotics, and the results of resistance genes detected by the real-time fluorescent quantitative PCR technology are shown in Table 2:
TABLE 2
The main structures involved in the treatment process and the parameters involved are shown in table 3:
TABLE 3
| Serial number | Name (R) | Specification and model | Number of |
| 1 | Solid-liquid separator | Table (Ref. Table) | 1 |
| 2 | Reinforced concrete pipe | Φ80 | Total length of 10m |
| 3 | Iron-carbon pretreatment pool | — | 20m3 |
| 4 | A/O biochemical pool | — | 50m3 |
| 5 | Two-stage sedimentation tank | — | |
| 6 | Artificial wet land | — | 25m3 |
(1) In the water inlet part, the liquid dung collected by the solid-liquid separator and the waste water of the urine collecting pipe are collected into the water inlet pipe, because the amount of the sewage to be treated is 200m per day3The treatment time per day is set to be 12 hours, the hydraulic retention time is 1 hour, and therefore the sewage flow in the collective inlet pipe 3 is determined according to the following formula:
Q＝V/(t·T)＝200m3÷(12h×1h)＝16.67m3/h。
then flows into an iron-carbon pretreatment pool.
(2) The method comprises the following steps that inflow water firstly flows through a sewage blocking grid to block residues and large suspended matters in the sewage, then flows into an iron-carbon pretreatment tank from the bottom of the iron-carbon pretreatment tank, flows through an iron-carbon filler along with the rising of a water level, decomposes organic matters through aeration and iron-carbon micro-electrolysis, reduces COD (chemical oxygen demand), flows into the iron-carbon pretreatment tank from bottom to top, and then flows into a biochemical reaction tank from high-water-level effluent, wherein the iron-carbon filler comprises iron scrap waste and biochar, the mass ratio of the iron to the carbon is 4-5: 1, and the iron scrap waste is in a 10% NaOH solution and 5% H when being used for the first time2SO4Solutions ofSoaking for 1 hour, and cleaning with clear water, wherein the biochar is obtained by pyrolysis of local agricultural wastes such as straws and the like, is in the shape of cylindrical particles, and has the cross section diameter of 1-2 cm and the length of 3-5 cm.
(3) The sewage after the iron-carbon pretreatment firstly enters an anaerobic reaction tank, the biological treatment effect is enhanced by adding a microbial agent, macromolecular organic matters in the sewage are further removed, and a valve on a partition wall is closed when the sewage is not treated, so that the anaerobic condition of an anaerobic chamber is kept. The sewage after the reaction in the anaerobic chamber enters the aerobic reaction chamber, and the nitrification of microorganisms is accelerated by aeration to remove ammonia nitrogen. The microbial agent is prepared by compounding bacillus subtilis, EM (effective microorganism) strains, glucose, sodium chloride, peptone, calcium carbonate and potassium dihydrogen phosphate, wherein each 1L of water contains 10g of bacillus subtilis strains, 10g of EM strains, 10g of glucose, 0.5g of sodium chloride, 1.0g of peptone, 3g of calcium carbonate and 0.5g of potassium dihydrogen phosphate.
(4) The sewage of the aerobic reaction chamber is discharged from a high water level and enters a secondary sedimentation tank, and H is added2O2And Fenton reaction is carried out under the irradiation of sunlight to generate free radicals with high oxidizability, so that bacteria are killed by oxidation, and resistance genes in sewage are removed. Meanwhile, the sludge in the secondary sedimentation tank flows back to the anaerobic reaction chamber through a reflux pump, and the nitrate nitrogen generated by nitrification is removed by using the denitrification of anaerobic bacteria.
(5) Supernatant in the secondary sedimentation tank flows into the vertical subsurface flow constructed wetland from an upper outlet, and the water quality is further purified through matrix adsorption and plant absorption, so that the resistance genes dissociating in the water body are removed.
As shown in fig. 2, the substrate of the artificial wetland comprises a cobble layer, a middle gravel layer, a fine gravel layer and a sand stone layer from bottom to top, and the artificial wetland consists of different porous medium materials comprising carbonate, igneous rock, zeolite and bauxite; 2 plants, namely reed and cattail, are planted in the wetland.
The water quality index and the abundance result of the resistance gene of the constructed wetland effluent are shown in tables 4 and 5:
TABLE 4
| Index (mg. L)-1) | pH | COD | SS | NH4 +-N | BOD5 | TP |
| Discharge port | 6.78 | 256 | 11 | 34.8 | 105 | 5.63 |
| Emission standard | — | 400 | 200 | 80 | 130 | 8 |
TABLE 5
The above is a practical case of the present invention, which is merely to illustrate the process flow and technical solution of the present invention, and is not intended to limit the present invention; all changes, substitutions and alterations that come within the spirit and scope of the invention are intended to be embraced therein.
Claims (8)
1. A device for removing resistance genes and nitrogen and phosphorus in wastewater of a livestock and poultry farm is characterized by comprising a water inlet part, an iron-carbon pretreatment tank, a biochemical treatment tank, a secondary sedimentation tank and an artificial wetland which are sequentially connected;
wherein, the water inlet part comprises a solid-liquid separator, a urine collecting pipeline and a water inlet pipeline. The water inlet pipeline is connected to the iron-carbon pretreatment tank;
the iron-carbon pretreatment tank comprises a sewage blocking grid, iron-carbon fillers, aeration equipment and a sewage outlet, wherein the sewage outlet is formed in the bottom of the iron-carbon pretreatment tank;
the artificial wetland comprises a substrate (16), wetland plants are planted on the substrate, and a water outlet pipeline (17) is arranged on the upper side wall of the substrate.
2. The apparatus for removing the resistance genes and the nitrogen and phosphorus in the wastewater of the livestock and poultry farm according to claim 1, wherein the biochemical treatment tank comprises an anaerobic reaction chamber and an aerobic reaction chamber which are arranged side by side, a microbial agent adding system (10) is arranged at the top of the anaerobic reaction chamber (9), and an aeration system (13) is arranged at the bottom of the aerobic reaction chamber (12).
3. The apparatus for removing resistance genes and nitrogen and phosphorus in wastewater of livestock and poultry farm according to claim 1, wherein the top of the secondary sedimentation tank is provided with H2O2A feeding system (14), the bottom of which is connected with a sludge flow pump (15), and an output pipeline connected with a reflux pump is connected to the anaerobic reverse flowAnd in the reaction chamber (9), the sludge in the secondary sedimentation tank flows back to the anaerobic reaction chamber through a reflux pump.
4. The device for removing the resistance genes and the nitrogen and phosphorus removal in the wastewater of the livestock and poultry farm according to claim 1, wherein the iron-carbon filler is a mixture of iron filings and biochar in a mass ratio of 4-5: 1; the microbial agent is prepared by compounding bacillus subtilis, EM (effective microorganism) strains, glucose, sodium chloride, peptone, calcium carbonate and potassium dihydrogen phosphate, wherein each 1L of water contains 10g of bacillus subtilis strains, 10g of EM strains, 10g of glucose, 0.5g of sodium chloride, 1.0g of peptone, 3g of calcium carbonate and 0.5g of potassium dihydrogen phosphate.
5. The operation process of the device for removing the resistance genes and the nitrogen and phosphorus in the wastewater of the livestock and poultry farm based on the claim 1 is characterized by comprising the following steps:
(1) in the water inlet part, collected liquid dung and waste water from a urine collecting pipeline (2) are collected into a water inlet pipeline (3) through a solid-liquid separator (1) and flow into an iron-carbon pretreatment pool;
(2) in the iron-carbon pretreatment tank, inlet water firstly flows through a trash rack (4) to intercept residues and large suspended matters in the sewage, then flows upwards from the bottom of the iron-carbon pretreatment tank, flows through an iron-carbon filler along with the rising of water level, decomposes organic matters and reduces COD through the aeration of an aeration device (7) and the iron-carbon micro-electrolysis of the iron-carbon filler (5), the flow direction of the sewage in the iron-carbon pretreatment tank is from bottom to top, and then the outlet water from high water level enters a biochemical reaction tank from front to back;
(3) in the biochemical reaction tank, water flow firstly enters the anaerobic reaction tank, and a microbial agent is added through a microbial agent adding system (10), so that the biological treatment effect is enhanced, and macromolecular organic matters in sewage are further removed; the sewage after the reaction in the anaerobic chamber enters an aerobic reaction chamber (12), and the nitrification of microorganisms is accelerated by the aeration of a bottom aeration system (13) to remove ammonia nitrogen; the sewage of the aerobic reaction chamber is discharged from a high water level and then enters a secondary sedimentation tank;
(4) in a secondary sedimentation tank, adding H2O2The Fenton reaction is carried out with the sunlight irradiation to generate free radicals with high oxidizability, and the free radicals are oxidized to kill bacteria and remove resistance genes in the sewage; meanwhile, the sludge in the secondary sedimentation tank flows back into the anaerobic reaction chamber (9) through a reflux pump, and the nitrate nitrogen generated by nitrification is removed by using the denitrification of anaerobic bacteria; finally, supernatant in the secondary sedimentation tank enters the vertical subsurface flow constructed wetland from the upper part;
(5) in the artificial wetland, the water quality is further purified through substrate adsorption and wetland plant absorption, and the resistance genes dissociated in the water body are removed.
6. The operation process of the apparatus for removing the resistance genes and the nitrogen and phosphorus in the wastewater of the livestock and poultry farm according to claim 5, wherein the substrate of the artificial wetland comprises a cobble layer, a middle gravel layer, a fine gravel layer and a gravel layer from bottom to top, and the wetland plants comprise reed and cattail.
7. The process of claim 5, wherein the flow rate of the wastewater in the water inlet pipe is determined according to the following formula:
Q＝V/(t·T)
wherein V is the amount of wastewater to be treated per day/m3T is the treatment time per day/h, T is the hydraulic retention time/h, and T is 40min to 1 h.
8. The operating process of the apparatus for removing resistance genes and nitrogen and phosphorus in wastewater of livestock and poultry farms according to claim 5, wherein the valve on the partition wall between the anaerobic reaction chamber (9) and the aerobic reaction chamber (12) is closed when no sewage is treated, and the anaerobic chamber is kept in an anoxic condition.
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