CN108264199B - Pig farm wastewater treatment process - Google Patents
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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
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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
- 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
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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
- 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
- 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 discloses a wastewater treatment process for a pig farm, which comprises the following steps of carrying out primary solid-liquid separation on the wastewater of the pig farm through a water collecting tank, and taking obtained solid waste I as a raw material of an organic compound fertilizer; carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; and (4) treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging. The piggery wastewater treatment process has the advantages of low energy consumption, small sludge generation amount, low subsequent sludge treatment cost, simple facility and no need of professional management.
Description
Technical Field
The invention relates to the technical field of wastewater multistage treatment, in particular to a wastewater treatment process in a pig farm.
Background
The development of the large-scale pig industry causes the concentrated discharge of waste water and brings serious pollution to the surrounding environment. For the treatment of the wastewater in the pig farm, various different treatment modes are adopted in various places. The pig farm with small scale or available land around is mostly returned to the field or naturally treated; the pig farm with large scale or short land is mainly treated by adopting an engineering mode. In the engineering mode treatment, generally, anaerobic pretreatment is carried out first, and then aerobic treatment is carried out, because of BOD of anaerobic digestion solution5lower/TN, often plagued by "acidification" in their aerobic post-treatment, COD and NH4 +The removal effect of N is poor, the concentration of effluent is high, the acidification problem can be relieved by adding exogenous alkaline substances or exogenous organic substances, but the financial, material and manpower consumption is increased.
At present, the effective treatment process for the piggery wastewater comprises a direct SBR process and an Anarwia process, and the Anarwia process is superior to the direct SBR process in terms of operation cost and effluent effect. Two processes for treating COD and NH in water4 +N water reaches the discharge standard of pollutants for livestock and poultry breeding (GB 18596-2001), but can not meet the current increasingly-improved environmental protection requirement, and still has the problems of high energy consumption, large sludge generation amount, high subsequent sludge treatment cost, complex facilities and need of professional management.
Chinese patent CN201010146561.4 discloses a sequencing batch biofilm reactor treatment method for wastewater in a pig farm, which comprises the following steps: pig farm wastewater is collected by a collecting pipe network and then flows into an anaerobic reactor (a methane tank), and sewage generated after methane is generated flows into a sequencing batch biofilm reactor (SBBR tank); the SBBR technological process and the time parameters of each technological section are regulated and controlled to be in a proper state through an automatic control device, and a part of piggery wastewater can be introduced into an SBBR pool. However, the method still has the problems of high energy consumption, large sludge generation amount, high subsequent sludge treatment cost, complex facilities and need of professional management.
Chinese patent CN201610320991.0 discloses a method for treating wastewater from pig farms, which comprises the following steps: (1) pretreatment: collecting the wastewater in the pig farm through a pipeline, feeding the wastewater into a grating tank, removing the excrement materials, feeding the wastewater into a water quality adjusting device, removing phosphorus, homogenizing water quality, and preliminarily hydrolyzing and acidifying; (2) anaerobic treatment: the wastewater treated by the water quality regulating device enters a methane tank for anaerobic treatment and then enters a hydrolysis acidification tank to hydrolyze insoluble organic matters into soluble organic matters; (3) aerobic treatment: carrying out aerobic treatment on the wastewater treated by the hydrolysis acidification tank; (4) deep treatment: and (4) the wastewater after the aerobic treatment enters an advanced degradation device, and advanced treatment is carried out by adopting aerobic granular sludge. However, the method still has the problems of high energy consumption, large sludge generation amount, high subsequent sludge treatment cost, complex facilities and need of professional management.
Therefore, a novel pig-raising wastewater treatment method is needed, and has the advantages of low energy consumption, small sludge production amount, low subsequent sludge treatment cost, simple facility and no need of professional management.
Disclosure of Invention
The invention aims at the problems and provides a wastewater treatment process for a pig farm.
The technical scheme adopted by the invention for solving the problems is as follows: a piggery wastewater treatment process comprises the following steps:
step A1, carrying out primary solid-liquid separation on the pig farm wastewater through a water collecting tank, and taking the obtained solid waste I as a raw material of the organic compound fertilizer;
step A2, carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; adding compound bacteria into the biological multiplication biochemical reaction tank for strengthening treatment; the composite bacteria adopt Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus according to the weight ratio of 1: 0.5-1.2: 0.6-1; the matrix filler of the flocculation sedimentation tank adopts modified seaweed soft layers and modified coal gangue layers which are alternately arranged for three times, and six layers are formed; the adding amount of the compound bacteria is generally 1-3% of the mass of the waste water of the biological multiplication biochemical reaction tank;
step A3, treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging; the artificial wetland treatment comprises the following steps: treating the liquid waste II in a primary biological pond, a primary biological gravel bed and a secondary biological pond in sequence, wherein the aquatic organisms generated in the treatment process are used as green feed for raising pigs, and treating the obtained liquid waste III in a secondary biological gravel bed and a plant percolation bed to obtain liquid meeting the discharge standard for discharge; planting waterweed and cattail in the primary aquatic pond; planting golden fish algae in the secondary aquatic pond; the treatment area ratio of the first-stage aquatic pond, the first-stage biological gravel bed and the second-stage aquatic pond is as follows: 1.3-1.9: 1.8-2.3: 1.
the application relates to a pig farm wastewater treatment process which comprises a biological multiplication technology, calcium salt coagulation dephosphorization and artificial wetland technology. The pig farm waste water with high organic matter and high ammonia nitrogen is mostly removed in the treatment stage of the biological multiplication technology, high phosphorus in the waste water is removed by calcium salt coagulation, and the artificial wetland is good at treating micro-polluted water, so that the quality of discharged sewage is improved.
The method comprises the steps of adding compound bacteria into a biological multiplication biochemical reaction tank for strengthening treatment; the composite bacteria are compounded by using Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus, and adopting Nitrobacter, denitrifying bacillus and Micrococcus; further, the ability of eliminating odor, ammonia nitrogen and COD is improved.
Further, in the step A1, the hydraulic retention time of the water collecting tank is 0.2-0.3 h.
Further, in step a2, the operating conditions of the bio-doubling biochemical reaction tank are as follows: the volume load is 2.2-3.0 kgBOD5·m3D, sludge load of 0.25 to 0.4kgBOD5Kg & MLSS & d, and the hydraulic retention time is 55-65 h.
Further, in the step A2, the hydraulic retention time of the flocculation sedimentation tank is 0.5-0.7 h.
Further, in the step a2, the preparation method of the modified coal gangue comprises: crushing 1000 parts by weight of coal gangue, sieving the coal gangue with a 20-mesh sieve, soaking the coal gangue in concentrated sulfuric acid for 24-48 h, taking out the coal gangue, transferring the coal gangue to a muffle furnace, and carrying out heat treatment at 250-300 ℃ for 1-2 h to obtain a product, namely the modified coal gangue.
Further, in step a2, the modified seaweed is prepared by the following steps: 1000 parts by weight of seaweed is crushed and sieved by a sieve of 80 meshes, the seaweed is soaked in a dilute sulfuric acid solution with the concentration of 0.05 mol/L-0.1 mol/L, the seaweed is taken out and then put into cellulase with the concentration of 0.01 mol/L-0.03 mol/L, the seaweed is taken out and naturally dried, and the obtained product is the modified seaweed.
Further, in the step a3, the process parameters of the artificial wetland treatment are as follows: the hydraulic retention time is 0.55 to 0.7h, and the hydraulic load is 0.3 to 0.5m3/(m2·d)。
Further, in step a3, the first-stage bio-gravel bed is specifically set as follows: blue algae grows at the bottom of the primary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 30 cm-40 cm, a 20-mesh-40-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper portion of the first layer of crushed stone layer is 30 cm-40 cm, a 10-mesh-15-mesh crushed coal gangue layer is adopted, the thickness of a third layer of crushed stone layer on the upper portion of the second layer of crushed stone layer is 35 cm-50 cm, and a 5-mesh-10-mesh silica limestone layer is adopted.
Further, in the step a3, the setting of the secondary biological gravel bed is specifically as follows: blue algae grows at the bottom of the secondary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 20 cm-30 cm, a 40-60-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper portion of the first layer of crushed stone layer is 15 cm-20 cm, a 20-40-mesh wollastonite layer is adopted, the thickness of a third layer of crushed stone layer on the upper portion of the second layer of crushed stone layer is 30 cm-40 cm, and a 10-30-mesh waste stone layer is adopted.
Further, in step a3, the ratio of the treatment areas of the secondary biological gravel bed and the plant infiltration bed is: 1.8-2.3: 1.
the invention has the advantages that:
1. the water quality discharge standard treated by the piggery wastewater treatment process is higher than the discharge standard of pollutants for livestock and poultry breeding industry (GB 18596-2001), and can reach the first grade A of pollutants discharge standard for municipal wastewater treatment plants (GB 18918-2002);
2. the piggery wastewater treatment process can reduce the treatment cost of piggery wastewater, improve the treatment effect, and reduce the energy consumption by 30-50% in the treatment process; the amount of sludge generated is small, and the subsequent sludge treatment cost is low; the facility is simple, and professional management is not needed;
3. the piggery wastewater treatment process can realize wastewater reclamation: phosphorus is recovered, green feed is fed to pigs in wetland growth, and water is directly discharged after reaching the standard and becomes reclaimed water resources.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the preparation of the invention. In the drawings:
FIG. 1 is a process flow for treating wastewater of a pig farm by a direct SBR process;
FIG. 2 is a process flow of the Anarwia process for treating wastewater from a pig farm;
FIG. 3 is a flow chart of the pig farm wastewater treatment process of the present application.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
A piggery wastewater treatment process comprises the following steps:
step A1, carrying out primary solid-liquid separation on the pig farm wastewater through a water collecting tank, and taking the obtained solid waste I as a raw material of the organic compound fertilizer; wherein the hydraulic retention time of the water collecting tank is 0.2 h;
step A2, carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; the matrix filler of the flocculation sedimentation tank adopts modified seaweed soft layers and modified coal gangue layers which are alternately arranged for three times, and six layers are formed; wherein, compound bacteria are added into the biological multiplication biochemical reaction tank for strengthening treatment; the composite bacteria adopt Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus according to the weight ratio of 1: 0.5: 0.6 of the components; the working conditions of the biological multiplication biochemical reaction tank are as follows: volume loading of 2.2kgBOD5·m3D, sludge load of 0.25 kgBOD5Kg. MLSS. d, hydraulic retention time of 55 h; the hydraulic retention time of the flocculation sedimentation tank is 0.5 h; the preparation method of the modified coal gangue comprises the following steps: crushing 1000 parts by weight of coal gangue, sieving the coal gangue with a 20-mesh sieve, soaking the coal gangue in concentrated sulfuric acid for 24 hours, taking out the coal gangue, transferring the coal gangue to a muffle furnace, and carrying out heat treatment at 250 ℃ for 1 hour to obtain a product, namely the modified coal gangue; the preparation method of the modified seaweed comprises the following steps: crushing 1000 parts by weight of seaweed, sieving the seaweed with a 80-mesh sieve, soaking the seaweed in a dilute sulfuric acid solution with the concentration of 0.05mol/L, taking out the seaweed, putting the seaweed into cellulase with the concentration of 0.01mol/L, taking out the seaweed and naturally airing the seaweed to obtain a product, namely modified seaweed; the adding amount of the compound bacteria is generally 1 percent of the mass of the waste water of the biological multiplication biochemical reaction tank;
step A3, treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging; the artificial wetland treatment comprises the following steps: treating the liquid waste II in a primary biological pond, a primary biological gravel bed and a secondary biological pond in sequence, wherein the aquatic organisms generated in the treatment process are used as green feed for raising pigs, and treating the obtained liquid waste III in a secondary biological gravel bed and a plant percolation bed to obtain liquid meeting the discharge standard for discharge; planting the waterweed and the cattail in the first-level aquatic pond; planting golden fish algae in the second-level aquatic pond; first-level aquatic pond, first-level biological gravel bed and second-level aquatic systemThe area ratio of the pond to be treated is as follows: 1.3: 1.8: 1; the technological parameters of the artificial wetland treatment are as follows: the hydraulic retention time is 0.55h and the hydraulic load is 0.3m3/(m2D); the first-stage biological gravel bed is specifically arranged as follows: blue algae grows at the bottom of the primary biological gravel bed, the thickness of a first crushed stone layer on the upper layer of the blue algae is 30cm, a 20-mesh crushed zeolite layer is adopted, the thickness of a second crushed stone layer on the upper part of the first crushed stone layer is 30cm, a 10-mesh crushed coal gangue layer is adopted, the thickness of a third crushed stone layer on the upper part of the second crushed stone layer is 35cm, and a 5-mesh silica stone layer is adopted; the setting of the second-stage biological gravel bed is specifically as follows: blue algae grows at the bottom of the secondary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 20cm, a 40-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper part of the first layer of crushed stone layer is 15cm, a 20-mesh wollastonite layer is adopted, the thickness of a third layer of crushed stone layer on the upper part of the second layer of crushed stone layer is 30cm, and a 10-mesh waste stone layer is adopted; the treatment area ratio of the secondary biological gravel bed to the plant infiltration bed is 1.8: 1.
the results of the pig farm wastewater treatment of this example are shown in Table 1.
TABLE 1 pig farm wastewater treatment results of example 1
Example 2
A piggery wastewater treatment process comprises the following steps:
step A1, carrying out primary solid-liquid separation on the pig farm wastewater through a water collecting tank, and taking the obtained solid waste I as a raw material of the organic compound fertilizer; wherein the hydraulic retention time of the water collecting tank is 0.3 h;
step A2, carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; the matrix filler of the flocculation sedimentation tank adopts modified seaweed soft layers and modified coal gangue layers which are alternately arranged for three times, and six layers are formed; wherein, the bio-multiplication biochemical reaction tank is added with compound bacteria forStrengthening treatment; the composite bacteria adopt Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus according to the weight ratio of 1: 1.2: 1, compounding; the working conditions of the biological multiplication biochemical reaction tank are as follows: volume loading of 3.0kgBOD5·m3D, sludge load of 0.4kgBOD5Kg. MLSS. d, hydraulic retention time of 65 h; the hydraulic retention time of the flocculation sedimentation tank is 0.7 h; the preparation method of the modified coal gangue comprises the following steps: crushing 1000 parts by weight of coal gangue, sieving the coal gangue with a 20-mesh sieve, soaking the coal gangue in concentrated sulfuric acid for 48 hours, taking out the coal gangue, transferring the coal gangue to a muffle furnace, and carrying out heat treatment at 300 ℃ for 2 hours to obtain a product, namely the modified coal gangue; the preparation method of the modified seaweed comprises the following steps: crushing 1000 parts by weight of seaweed, sieving the seaweed with a 80-mesh sieve, soaking the seaweed in a dilute sulfuric acid solution with the concentration of 0.1mol/L, taking out the seaweed, putting the seaweed into cellulase with the concentration of 0.03mol/L, taking out the seaweed, and naturally drying the seaweed to obtain a product, namely modified seaweed; the adding amount of the compound bacteria is generally 3 percent of the mass of the waste water of the biological multiplication biochemical reaction tank;
step A3, treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging; the artificial wetland treatment comprises the following steps: treating the liquid waste II in a primary biological pond, a primary biological gravel bed and a secondary biological pond in sequence, wherein the aquatic organisms generated in the treatment process are used as green feed for raising pigs, and treating the obtained liquid waste III in a secondary biological gravel bed and a plant percolation bed to obtain liquid meeting the discharge standard for discharge; planting the waterweed and the cattail in the first-level aquatic pond; planting golden fish algae in the second-level aquatic pond; the treatment area ratio of the first-stage aquatic pond, the first-stage biological gravel bed and the second-stage aquatic pond is as follows: 1.9: 2.3: 1; the technological parameters of the artificial wetland treatment are as follows: the hydraulic retention time is 0.7h and the hydraulic load is 0.5m3/(m2D); the first-stage biological gravel bed is specifically arranged as follows: blue algae grows at the bottom of the primary biological gravel bed, the thickness of a first gravel layer on the upper layer of the blue algae is 40cm, a 40-mesh crushed zeolite layer is adopted, the thickness of a second gravel layer on the upper part of the first gravel layer is 40cm, a 15-mesh crushed coal gangue layer is adopted, the thickness of a third gravel layer on the upper part of the second gravel layer is 50cm, and a 10-mesh silica stone layer is adopted; setting tool for secondary biological gravel bedThe body is as follows: blue algae grows at the bottom of the secondary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 30cm, a 60-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper part of the first layer of crushed stone layer is 20cm, a 40-mesh wollastonite layer is adopted, the thickness of a third layer of crushed stone layer on the upper part of the second layer of crushed stone layer is 40cm, and a 30-mesh waste stone layer is adopted; the treatment area ratio of the secondary biological gravel bed to the plant infiltration bed is 2.3: 1.
the results of the treatment of the wastewater from the pig farm of this example are shown in Table 2.
TABLE 2 pig farm wastewater treatment results of example 2
Example 3
A piggery wastewater treatment process comprises the following steps:
step A1, carrying out primary solid-liquid separation on the pig farm wastewater through a water collecting tank, and taking the obtained solid waste I as a raw material of the organic compound fertilizer; wherein the hydraulic retention time of the water collecting tank is 0.25 h;
step A2, carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; the matrix filler of the flocculation sedimentation tank adopts modified seaweed soft layers and modified coal gangue layers which are alternately arranged for three times, and six layers are formed; wherein, compound bacteria are added into the biological multiplication biochemical reaction tank for strengthening treatment; the composite bacteria adopt Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus according to the weight ratio of 1: 1: 0.9 is compounded; the working conditions of the biological multiplication biochemical reaction tank are as follows: volume loading of 2.6kgBOD5·m3D, sludge load of 0.33kgBOD5Kg. MLSS. d, hydraulic retention time of 60 h; the hydraulic retention time of the flocculation sedimentation tank is 0.6 h; the preparation method of the modified coal gangue comprises the following steps: crushing 1000 parts by weight of coal gangue, sieving the coal gangue by a 20-mesh sieve, soaking the coal gangue in concentrated sulfuric acid for 36 hours, taking out the coal gangue, transferring the coal gangue to a muffle furnace, and performing heat treatment at the temperature of 280 ℃ for 1.5 hours to obtain the coal gangueThe product of (1) is the modified coal gangue; the preparation method of the modified seaweed comprises the following steps: crushing 1000 parts by weight of seaweed, sieving the seaweed with a 80-mesh sieve, soaking the seaweed in a dilute sulfuric acid solution with the concentration of 0.08mol/L, taking out the seaweed, putting the seaweed into cellulase with the concentration of 0.02mol/L, taking out the seaweed, and naturally airing the seaweed to obtain a product, namely modified seaweed; the adding amount of the compound bacteria is generally 2 percent of the mass of the waste water of the biological multiplication biochemical reaction tank;
step A3, treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging; the artificial wetland treatment comprises the following steps: treating the liquid waste II in a primary biological pond, a primary biological gravel bed and a secondary biological pond in sequence, wherein the aquatic organisms generated in the treatment process are used as green feed for raising pigs, and treating the obtained liquid waste III in a secondary biological gravel bed and a plant percolation bed to obtain liquid meeting the discharge standard for discharge; planting the waterweed and the cattail in the first-level aquatic pond; planting golden fish algae in the secondary aquatic pond; the treatment area ratio of the first-stage aquatic pond, the first-stage biological gravel bed and the second-stage aquatic pond is 1.6: 2.1: 1; the technological parameters of the artificial wetland treatment are as follows: the hydraulic retention time is 0.63h and the hydraulic load is 0.4m3/(m2D); the first-stage biological gravel bed is specifically arranged as follows: blue algae grows at the bottom of the primary biological gravel bed, the thickness of a first crushed stone layer on the upper layer of the blue algae is 35cm, a crushed zeolite layer with 30 meshes is adopted, the thickness of a second crushed stone layer on the upper part of the first crushed stone layer is 35cm, a crushed coal gangue layer with 12 meshes is adopted, the thickness of a third crushed stone layer on the upper part of the second crushed stone layer is 42cm, and a silica stone layer with 7.5 meshes is adopted; the setting of the second-stage biological gravel bed is specifically as follows: blue algae grows at the bottom of the secondary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 25cm, a 50-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper part of the first layer of crushed stone layer is 18cm, a 30-mesh wollastonite layer is adopted, the thickness of a third layer of crushed stone layer on the upper part of the second layer of crushed stone layer is 35cm, and a 20-mesh waste stone layer is adopted; the treatment area ratio of the secondary biological gravel bed to the plant infiltration bed is 2.1: 1.
the results of the treatment of the wastewater from the pig farm of this example are shown in Table 3.
TABLE 3 pig farm wastewater treatment results of example 3
Example 4
A piggery wastewater treatment process comprises the following steps:
step A1, carrying out primary solid-liquid separation on the pig farm wastewater through a water collecting tank, and taking the obtained solid waste I as a raw material of the organic compound fertilizer; wherein the hydraulic retention time of the water collecting tank is 0.22 h;
step A2, carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; the matrix filler of the flocculation sedimentation tank adopts modified seaweed soft layers and modified coal gangue layers which are alternately arranged for three times, and six layers are formed; wherein, compound bacteria are added into the biological multiplication biochemical reaction tank for strengthening treatment; the composite bacteria adopt Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus according to the weight ratio of 1: 0.8: 0.8 of the components; the working conditions of the biological multiplication biochemical reaction tank are as follows: volume loading of 2.8kgBOD5·m3D, sludge load of 0.35kgBOD5Kg. MLSS. d, hydraulic retention time of 62 h; the hydraulic retention time of the flocculation sedimentation tank is 0.65 h; the preparation method of the modified coal gangue comprises the following steps: crushing 1000 parts by weight of coal gangue, sieving the coal gangue with a 20-mesh sieve, soaking the coal gangue in concentrated sulfuric acid for 40 hours, taking out the coal gangue, transferring the coal gangue to a muffle furnace, and carrying out heat treatment at 290 ℃ for 1.6 hours to obtain a product, namely the modified coal gangue; the preparation method of the modified seaweed comprises the following steps: crushing 1000 parts by weight of seaweed, sieving the seaweed with a 80-mesh sieve, soaking the seaweed in a dilute sulfuric acid solution with the concentration of 0.09mol/L, taking out the seaweed, putting the seaweed into cellulase with the concentration of 0.025mol/L, taking out the seaweed, and naturally airing the seaweed to obtain a product, namely modified seaweed; the adding amount of the compound bacteria is generally 1.5 percent of the mass of the waste water of the biological multiplication biochemical reaction tank;
step A3, treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging; what is needed isThe artificial wetland treatment comprises the following steps: treating the liquid waste II in a primary biological pond, a primary biological gravel bed and a secondary biological pond in sequence, wherein the aquatic organisms generated in the treatment process are used as green feed for raising pigs, and treating the obtained liquid waste III in a secondary biological gravel bed and a plant percolation bed to obtain liquid meeting the discharge standard for discharge; planting the waterweed and the cattail in the first-level aquatic pond; planting golden fish algae in the second-level aquatic pond; the treatment area ratio of the first-stage aquatic pond, the first-stage biological gravel bed and the second-stage aquatic pond is 1.8: 2.2: 1; the technological parameters of the artificial wetland treatment are as follows: the hydraulic retention time is 0.68h and the hydraulic load is 0.45m3/(m2D); the first-stage biological gravel bed is specifically arranged as follows: blue algae grows at the bottom of the primary biological gravel bed, the thickness of a first crushed stone layer on the upper layer of the blue algae is 36cm, a 25-mesh crushed zeolite layer is adopted, the thickness of a second crushed stone layer on the upper part of the first crushed stone layer is 38cm, a 14-mesh crushed coal gangue layer is adopted, the thickness of a third crushed stone layer on the upper part of the second crushed stone layer is 45cm, and a 6-mesh silica stone layer is adopted; the setting of the second-stage biological gravel bed is specifically as follows: blue algae grows at the bottom of the secondary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 22cm, a 42-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper part of the first layer of crushed stone layer is 16cm, a 25-mesh wollastonite layer is adopted, the thickness of a third layer of crushed stone layer on the upper part of the second layer of crushed stone layer is 38cm, and a 25-mesh waste stone residue layer is adopted; the treatment area ratio of the secondary biological gravel bed to the plant infiltration bed is 2.2: 1.
the results of the treatment of the wastewater from the pig farm of this example are shown in Table 4.
TABLE 4 pig farm wastewater treatment results of example 4
Examples of the experiments
The results of treating the piggery wastewater according to the treatment process of example 3 were compared with the results of treating the wastewater by the Anarwia process and the SBR process, and the results are shown in Table 5.
TABLE 5 results of various processes for treating wastewater from pig farms
The comparison of the amount of air consumed and the oxygen conversion efficiency of the bio-doubling process in the treatment process according to example 3 with the existing SBR process is shown in table 6.
Table 6 comparison of air consumption and oxygen conversion efficiency of the bio-doubling process in the treatment process of example 3 with the existing SBR process
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A piggery wastewater treatment process is characterized by comprising the following steps:
step A1, carrying out primary solid-liquid separation on the pig farm wastewater through a water collecting tank, and taking the obtained solid waste I as a raw material of the organic compound fertilizer;
step A2, carrying out secondary solid-liquid separation on the liquid waste I obtained by the primary solid-liquid separation through a biological multiplication biochemical reaction tank, carrying out calcium salt enhanced flocculation and precipitation on the solid waste II obtained by the secondary solid-liquid separation through a flocculation and precipitation tank, and recycling the obtained precipitate for phosphate fertilizer; adding compound bacteria into the biological multiplication biochemical reaction tank for strengthening treatment; the composite bacteria adopt Sterliae bacillus, Nitrobacter winogradskyi and Micrococcus luteus according to the weight ratio of 1: 0.5-1.2: 0.6-1; the matrix filler of the flocculation sedimentation tank adopts modified seaweed soft layers and modified coal gangue layers which are alternately arranged for three times, and six layers are formed;
step A3, treating the liquid waste II obtained by the secondary solid-liquid separation through an artificial wetland to obtain liquid meeting the discharge standard, and discharging; the artificial wetland treatment comprises the following steps: treating the liquid waste II in a primary biological pond, a primary biological gravel bed and a secondary biological pond in sequence, wherein the aquatic organisms generated in the treatment process are used as green feed for raising pigs, and treating the obtained liquid waste III in a secondary biological gravel bed and a plant percolation bed to obtain liquid meeting the discharge standard for discharge; planting waterweed and cattail in the primary aquatic pond; planting golden fish algae in the secondary aquatic pond; the treatment area ratio of the first-stage aquatic pond, the first-stage biological gravel bed and the second-stage aquatic pond is as follows: 1.3-1.9: 1.8-2.3: 1.
2. the piggery wastewater treatment process according to claim 1, wherein in the step A1, the hydraulic retention time of the water collecting tank is 0.2-0.3 h.
3. The piggery wastewater treatment process according to claim 1, wherein in step a2, the operating conditions of the bio-multiplied biochemical reaction tank are as follows: the volume load is 2.2-3.0 kgBOD5•m3D, the sludge load is 0.25-0.4 kgBOD5Mlss.d, and the hydraulic retention time is 55-65 h.
4. The piggery wastewater treatment process according to claim 1, wherein in the step A2, the hydraulic retention time of the flocculation sedimentation tank is 0.5-0.7 h.
5. The piggery wastewater treatment process according to claim 1, wherein in step a2, the preparation method of the modified coal gangue comprises: crushing 1000 parts by weight of coal gangue, sieving the coal gangue with a 20-mesh sieve, soaking the coal gangue in concentrated sulfuric acid for 24-48 h, taking out the coal gangue, transferring the coal gangue to a muffle furnace, and carrying out heat treatment at 250-300 ℃ for 1-2 h to obtain a product, namely the modified coal gangue.
6. The piggery wastewater treatment process according to claim 1, wherein in step a2, the preparation method of the modified seaweed comprises: 1000 parts by weight of seaweed is crushed and sieved by a sieve of 80 meshes, the seaweed is soaked in a dilute sulfuric acid solution with the concentration of 0.05 mol/L-0.1 mol/L, the seaweed is taken out and then put into cellulase with the concentration of 0.01 mol/L-0.03 mol/L, the seaweed is taken out and naturally dried, and the obtained product is the modified seaweed.
7. The piggery wastewater treatment process according to claim 1, wherein in the step A3, the process parameters of the artificial wetland treatment are as follows: the hydraulic retention time is 0.55 to 0.7h, and the hydraulic load is 0.3 to 0.5m3/(m2•d)。
8. The piggery wastewater treatment process according to claim 1, wherein in step a3, the primary biological gravel bed is specifically set as follows: blue algae grows at the bottom of the primary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 30 cm-40 cm, a 20-mesh-40-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper portion of the first layer of crushed stone layer is 30 cm-40 cm, a 10-mesh-15-mesh crushed coal gangue layer is adopted, the thickness of a third layer of crushed stone layer on the upper portion of the second layer of crushed stone layer is 35 cm-50 cm, and a 5-mesh-10-mesh silica limestone layer is adopted.
9. The piggery wastewater treatment process according to claim 1, wherein in step a3, the secondary biological gravel bed is specifically set as follows: blue algae grows at the bottom of the secondary biological gravel bed, the thickness of a first layer of crushed stone layer on the upper layer of the blue algae is 20 cm-30 cm, a 40-60-mesh crushed zeolite layer is adopted, the thickness of a second layer of crushed stone layer on the upper portion of the first layer of crushed stone layer is 15 cm-20 cm, a 20-40-mesh wollastonite layer is adopted, the thickness of a third layer of crushed stone layer on the upper portion of the second layer of crushed stone layer is 30 cm-40 cm, and a 10-30-mesh waste stone layer is adopted.
10. The piggery wastewater treatment process according to claim 1, wherein in the step A3, the treatment area ratio of the secondary biological gravel bed and the plant infiltration bed is as follows: 1.8-2.3: 1.
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