Water-saving low-cost tail gas purification treatment system for livestock and poultry breeding house

Abstract

The utility model belongs to the technical field of poultry breeding house tail gas treatment, and discloses a water-saving low-cost poultry breeding house tail gas purification treatment system. Comprising a bio-trickling filter, a water vapor condensation recovery device, an aerobic biological tank, a sedimentation tank, a filter and a water storage tank, the water vapor condensation recovery device comprises a shell, a condenser is arranged in the middle of the lower portion of an inner cavity of the shell, a condensate inlet of the condenser is formed in the upper portion, a condensate outlet of the condenser is formed in the lower portion, and the condensate inlet and the condensate outlet penetrate through the corresponding positions of the shell and extend outwards. And hydrophilic baffles which are arranged in a staggered manner are respectively and obliquely arranged on the inner walls of the two opposite sides of the shell above the condenser. According to the ammonia-containing waste gas treatment system, efficient recovery and on-site treatment of ammonia-containing waste gas discharged out of the breeding house are achieved, cyclic utilization of water resources is achieved, and meanwhile treatment cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment in poultry breeding houses, and in particular relates to a water-saving and low-cost tail gas purification and treatment system for livestock and poultry breeding houses. Background Art

[0002] With the development of social economy and the improvement of people's living standards, my country's demand for livestock and poultry products has continued to increase, and the livestock and poultry breeding industry has developed rapidly. Intensive and large-scale breeding methods have gradually replaced traditional free-range methods. However, the number of intensive and large-scale farms has gradually increased, and the amount of livestock and poultry breeding has also increased, so the amount of odor generated has increased sharply. The odor in the breeding house mainly comes from livestock and poultry feces and urine, feed residues, and the odor of livestock and poultry themselves. Livestock and poultry breeding is an important source of ammonia (NH3) emissions. Ammonia (NH3) emitted during the manure management process of farms accounts for 52% of my country's total emissions and 13.6% of the total global anthropogenic NH3 emissions. NH3 can induce the occurrence of a variety of respiratory diseases in poultry, pigs and other animals, reduce the growth and production performance of livestock and poultry, and even cause an increase in mortality. In addition, ammonia, as a pollutant with emission limits in national regulations, can burn human skin and eyes, and has serious harm to human health after inhalation.

[0003] Most of the existing ammonia purification systems use water absorption to remove ammonia. By taking advantage of the high solubility of ammonia in water, ammonia is combined with water to form monohydrated ammonia (NH3•H2O), thereby reducing the concentration of ammonia and achieving the effect of reducing ammonia emissions. However, during this treatment process, the tail gas from the breeding house takes away a large amount of circulating water in the form of steam, and as the circulating water continuously absorbs ammonia and other gases, the pH value increases and the tail gas cannot be efficiently purified. Therefore, it is often necessary to replace the circulating water or add strong acid to the circulating water. Replacing the circulating water will result in excessive water consumption, resulting in a certain waste of water resources, and adding strong acid will increase the treatment cost. Utility Model Content

[0004] In view of the problems of water resource waste and high treatment cost in the prior art water absorption method for removing ammonia, the purpose of the utility model is to provide a water-saving and low-cost tail gas purification and treatment system for livestock and poultry breeding houses.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A water-saving, low-cost tail gas purification and treatment system for livestock and poultry breeding houses, comprising a biological trickling filter, a water vapor condensation recovery device, an aerobic biological pool, a sedimentation tank, a filter, and a water storage tank;

[0007] A water inlet and a first air outlet are arranged at the top of the bio-trickling filter tower body, a water outlet and a first air inlet are arranged at the bottom of the bio-trickling filter tower body, a spray device is arranged at the top of the inner cavity of the bio-trickling filter tower, a microbial filling area is arranged in the middle, and the water inlet is connected to the spray device;

[0008] The water vapor condensation recovery device comprises a shell, a condenser is arranged at the middle position below the inner cavity of the shell, and the condensate inlet of the condenser is at the top and the condensate outlet is at the bottom, and the condensate inlet and the condensate outlet respectively penetrate the shell at the corresponding positions and extend outward; the inner walls of the shell on both sides opposite to each other at the position above the condenser are respectively inclined and provided with staggered hydrophilic baffles; the bottom of the shell is provided with a second air inlet and a water return port, and the top of the shell is provided with a second air outlet, and the second air outlet is connected to the outside air;

[0009] The first air inlet of the bio-trickling filter is connected to the tail gas emission device of the livestock and poultry breeding house, and the first air outlet of the bio-trickling filter is connected to the second air inlet of the water vapor condensation recovery device;

[0010] The water outlet of the biological trickling filter is connected in series with an aerobic biological pool, a sedimentation tank, a filter and a water storage tank. The water storage tank is divided into two branches: one branch is connected to the condensate inlet of the water vapor condensation recovery device, and the other branch is connected to the water inlet of the biological trickling filter; both branches are equipped with water pumps; the condensate outlet of the water vapor condensation recovery device and the return water outlet of the water vapor condensation recovery device are both connected back to the water storage tank.

[0011] Preferably, the microbial filler includes a porous filler and nitrifying bacteria loaded thereon, wherein the porous filler is made of ceramic or plastic. Ceramic or plastic fillers have a large specific surface area and good biocompatibility, and can improve the formation and adhesion of biofilms.

[0012] Preferably, the aerobic biological pond is equipped with an aeration device (such as a microporous aerator), a gas distributor, a gas flow meter and / or an oxygen concentration monitor. The aeration device is used to improve the aeration efficiency; the gas distributor is used to evenly distribute the gas to promote full contact between the gas and the liquid; the gas flow meter and the oxygen concentration monitor are used to monitor and control the gas flow and oxygen concentration during the aeration process in real time to ensure the optimization of the aeration effect.

[0013] Preferably, the sedimentation tank is an inclined plate sedimentation tank or an inclined tube sedimentation tank to improve the sedimentation speed and sedimentation effect.

[0014] Preferably, the filter material of the filter is activated carbon or fiber filter material to improve the filtering effect.

[0015] Preferably, the filter adopts a multi-layer filtering structure and the pore size of each layer of filtering material gradually increases from top to bottom, so as to achieve step-by-step filtering and efficient removal of impurities.

[0016] Preferably, the water storage tank is provided with a liquid level control device and / or a water quality monitoring device. The liquid level control device can automatically replenish or drain water to keep the water level stable; the water quality monitoring device can monitor the water quality indicators of the clean water in real time, such as pH value, turbidity, etc., to ensure that the clean water quality meets the requirements.

[0017] Preferably, the condenser is a shell-and-tube condenser to improve condensation efficiency.

[0018] Preferably, the hydrophilic baffle is a metal plate or a plastic plate with the entire surface coated with a hydrophilic material. The hydrophilic baffle can better absorb and conduct water, and is used to optimize the flow and collection of condensed water, thereby improving the condensation effect.

[0019] Preferably, the hydrophilic material is acrylic resin, epoxy resin, polystyrene, polyvinyl chloride, polydimethylsiloxane, polyester or polyurethane.

[0020] In the utility model, the biological trickling filter, the aerobic biological pool, the sedimentation tank, the filter and the water storage tank are all known equipment and can be obtained through commercial purchase.

[0021] Beneficial effects:

[0022] (1) Efficient treatment: Through the combination of various equipment such as biological trickling filters and aerobic biological pools, efficient recovery and on-site treatment of ammonia-containing waste gas discharged from the breeding house is achieved;

[0023] (2) Water resource recycling: The water vapor in the treatment process can be recycled and reused, avoiding frequent replacement of circulating water and greatly reducing water resource consumption; in addition, due to the presence of the biotrickling filter, it is avoided to add strong acid to the circulating water in order to increase the ammonia recovery efficiency, thus reducing the treatment cost;

[0024] (3) Environmental protection and energy saving: The system adopts a combination of microbial treatment and physical condensation, without the need to add chemical agents, thus reducing secondary pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 : Schematic diagram of the overall structure of the utility model;

[0026] Among them, the figure markings are: 1-biological trickling filter tower; 2-aerobic biological pool; 3-sedimentation tank; 4-filter; 5-water storage tank; 6-water pump; 7-spraying device; 8-microbial filling area; 9-water inlet; 10-water outlet; 111-first air inlet, 112-second air inlet; 121-first air outlet, 122-second air outlet; 13-shell; 14-condenser; 15-condensate inlet; 16-condensate outlet; 17-hydrophilic baffle; 18-return port; single arrow represents gas flow direction; double arrow represents liquid flow direction. DETAILED DESCRIPTION

[0027] In order to make the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, a water-saving and low-cost tail gas purification and treatment system for livestock and poultry breeding houses includes a biological trickling filter 1, a water vapor condensation recovery device, an aerobic biological pool 2, a sedimentation tank 3, a filter 4, and a water storage tank 5;

[0030] The top of the biological trickling filter tower 1 is provided with a water inlet 9 and a first air outlet 121, the bottom of the biological trickling filter tower 1 is provided with a water outlet 10 and a first air inlet 111, the top of the inner cavity of the biological trickling filter tower 1 is provided with a spray device 7, the middle part is provided with a microbial filling area 8, and the water inlet 9 is connected with the spray device 7;

[0031] The water vapor condensation recovery device comprises a shell 13, a condenser 14 is provided at a middle position below the inner cavity of the shell 13, and the condensate inlet 15 of the condenser 14 is at the top and the condensate outlet 16 is at the bottom, the condensate inlet 15 and the condensate outlet 16 respectively penetrate the shell 13 at the corresponding positions and extend outward; the inner walls of the shell 13 on both sides above the condenser 14 are respectively inclined and staggeredly provided with hydrophilic baffles 17; the bottom of the shell 13 is provided with a second air inlet 112 and a water return port 18, and the top of the shell 13 is provided with a second air outlet 122, and the second air outlet 122 is connected to the outside air;

[0032] The first air inlet 111 of the bio-trickling filter 1 is connected to the tail gas emission device of the livestock and poultry breeding house, and the first air outlet 121 of the bio-trickling filter 1 is connected to the second air inlet 112 of the water vapor condensation recovery device;

[0033] The water outlet 10 of the biological trickling filter 1 is connected in series with the aerobic biological pool 2, the sedimentation tank 3, the filter 4 and the water storage tank 5 in sequence. The water storage tank 5 is divided into two branches: one branch is connected to the condensate inlet 15 of the water vapor condensation recovery device, and the other branch is connected to the water inlet 9 of the biological trickling filter 1; both branches are provided with a water pump 6; the condensate outlet 16 of the water vapor condensation recovery device and the return water inlet 18 of the water vapor condensation recovery device are both connected back to the water storage tank 5.

[0034] Among them, the microbial filler includes a porous filler and nitrifying bacteria loaded thereon, and the material of the porous filler is ceramic; the aerobic biological pool 2 is equipped with a microporous aerator, a gas distributor, a gas flow meter and an oxygen concentration monitor; the sedimentation tank 3 is an inclined plate sedimentation tank; the filter material of the filter 4 is activated carbon, and the filter 4 adopts a multi-layer filtration structure and the pore size of each layer of filter material gradually increases from top to bottom; the water storage tank 5 is provided with a liquid level control device and a water quality monitoring device; the condenser 14 is a shell-and-tube condenser; the hydrophilic baffle 17 is a metal plate with the entire surface coated with polydimethylsiloxane.

[0035] Working process: The ammonia-containing tail gas discharged from the tail gas discharge device of the livestock and poultry breeding house enters from the first air inlet 111 at the bottom of the bio-trickling filter 1 and flows from bottom to top. At the same time, the water sprayed from the spray device 7 flows from top to bottom. When the ammonia-containing tail gas and water pass through the microbial filler area 8, the microorganisms therein convert ammonia into harmless substances, such as nitrate (NO 3- ) or nitrite (NO 2-), the purified gas and part of the water vapor are discharged from the first air outlet 121 at the top of the bio-trickling filter 1, and enter from the second air inlet 112 at the bottom of the water vapor condensation recovery device; the liquid treated by the bio-trickling filter 1 is discharged from the water outlet 10 at the bottom of the bio-trickling filter 1, and flows to the aerobic biological pool 2 (there is not only ammonia in the tail gas of the livestock and poultry breeding house, but also many other volatile organic substances. If only ammonia is treated, the circulating water in the system will become more and more polluted as the organic substances accumulate, so the aerobic biological pool 2 needs to be purified). The aerobic biological pool 2 ensures the microorganisms in the aerobic biological pool 2 by providing sufficient dissolved oxygen (according to the type of other organic substances in the exhaust gas, the aerobic biological pool 2 selects microorganisms that are compatible with it). The aerobic respiration of the aerobic biological pool 2 is effective to meet the needs of its growth and metabolism, and plays a role in purifying the circulating water and decomposing the organic matter in the circulating water. The circulating water is purified, and when it is circulated back to the biological trickling filter, it can better absorb ammonia, providing a continuous source of power for the degradation of ammonia; the sedimentation tank 3 is used to remove the suspended matter in the water body after the treatment of the aerobic biological pool 2, so that it gradually settles down in the sedimentation tank 3, and then the insoluble solid matter in the water body is further removed through the filter 4; the clean water after sedimentation and filtration enters the water storage tank 5, and then is pumped out by the water pump 6, and a part of it returns to the water inlet 9 of the biological trickling filter 1 to be used for the water supplement of the spraying device 7, so as to realize the recycling of water resources (as the whole system In the circulation operation of the system, the nitrifying bacteria in the biological trickling filter 1 will eventually convert nitrate or nitrite into nitrogen gas, and finally discharge it into the air from the second gas outlet 122). A part of it enters the casing of the shell-and-tube condenser 14 through the condensate inlet 15 of the water vapor condensation recovery device. At the same time, the purified gas and water vapor flow upward after entering the water vapor condensation recovery device, so the clean water in the casing undergoes countercurrent heat exchange with the purified gas and part of the water vapor outside the casing. After the heat exchange, the hot water flows out through the condensate outlet 16 and returns to the water storage tank 5. As the condensation process continues, more and more water vapor condenses into liquid water on the outer surface of the casing, and the liquid water then accumulates at the bottom of the shell 13, and the purified gas and part of the water vapor are discharged. The gas behind and the water vapor that has not yet condensed continue to flow upward. When they reach the hydrophilic baffle 17, since the hydrophilic baffle 17 is made of hydrophilic material and has a strong adsorption capacity for water molecules, when the hydrophilic baffle 17 comes into contact with the air containing moisture, the water molecules will be adsorbed to the surface and inside of the hydrophilic baffle 17, gradually forming tiny water droplets or water films, which will accumulate on the surface or inside of the hydrophilic baffle 17. At this time, the inclined hydrophilic baffle 17 can make the accumulated water droplets or water films flow naturally to the bottom of the shell 13, and the air is discharged to the atmosphere from the second air outlet 122; the water accumulated at the bottom of the shell 13 returns to the water storage tank 5 from the return water port 18 at the bottom of the water vapor condensation recovery device.

Claims

1. A water-saving, low-cost livestock and poultry breeding house tail gas purification and treatment system, characterized by: It includes a biological trickling filter, a water vapor condensation recovery device, an aerobic biological pool, a sedimentation tank, a filter, and a water storage tank; A water inlet and a first air outlet are arranged at the top of the bio-trickling filter tower body, a water outlet and a first air inlet are arranged at the bottom of the bio-trickling filter tower body, a spray device is arranged at the top of the inner cavity of the bio-trickling filter tower, a microbial filling area is arranged in the middle, and the water inlet is connected to the spray device; The water vapor condensation recovery device comprises a shell, a condenser is arranged at the middle position below the inner cavity of the shell, and the condensate inlet of the condenser is at the top and the condensate outlet is at the bottom, and the condensate inlet and the condensate outlet respectively penetrate the shell at the corresponding positions and extend outward; the inner walls of the shell on both sides opposite to each other at the position above the condenser are respectively inclined and provided with staggered hydrophilic baffles; the bottom of the shell is provided with a second air inlet and a water return port, and the top of the shell is provided with a second air outlet, and the second air outlet is connected to the outside air; The first air inlet of the bio-trickling filter is connected to the tail gas emission device of the livestock and poultry breeding house, and the first air outlet of the bio-trickling filter is connected to the second air inlet of the water vapor condensation recovery device; The water outlet of the biological trickling filter is connected in series with an aerobic biological pool, a sedimentation tank, a filter and a water storage tank. The water storage tank is divided into two branches: one branch is connected to the condensate inlet of the water vapor condensation recovery device, and the other branch is connected to the water inlet of the biological trickling filter; both branches are equipped with water pumps; the condensate outlet of the water vapor condensation recovery device and the return water outlet of the water vapor condensation recovery device are both connected back to the water storage tank.

2. The water-saving, low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1, characterized in that: The microbial filler comprises a filler and nitrifying bacteria loaded thereon, and the filler is made of ceramic or plastic.

3. The water-saving, low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1, characterized in that: The aerobic biological pond is equipped with an aeration device, a gas distributor, a gas flow meter and / or an oxygen concentration monitor.

4. The water-saving and low-cost livestock and poultry breeding house tail gas purification system according to claim 1, characterized in that: The sedimentation tank is an inclined plate sedimentation tank or an inclined tube sedimentation tank.

5. The water-saving and low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1, characterized in that: The filter material of the filter is activated carbon or fiber filter material.

6. The water-saving, low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1 or 5, characterized in that: The filter adopts a multi-layer filtering structure and the pore size of each layer of filtering material gradually increases from top to bottom.

7. The water-saving and low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1, characterized in that: The water storage tank is provided with a liquid level control device and / or a water quality monitoring device.

8. The water-saving and low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1, characterized in that: The condenser is a shell and tube condenser.

9. The water-saving and low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 1, characterized in that: The hydrophilic baffle is a metal plate or a plastic plate with the entire surface coated with a hydrophilic material.

10. The water-saving and low-cost livestock and poultry breeding house tail gas purification treatment system according to claim 9, characterized in that: The hydrophilic material is acrylic resin, epoxy resin, polystyrene, polyvinyl chloride, polydimethylsiloxane, polyester or polyurethane.

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