System for storing and treating hog manure

Abstract

The present invention relates to a system for storing and treating hog manure. The system comprises: a sensor that measures the concentration of methane gas in a slurry pit in a hog barn; a collection tank into which slurry from the slurry pit flows when the concentration of methane gas measured by the sensor reaches or exceeds a certain range; an anaerobic digestion tank that anaerobically digests the slurry in the collection tank to produce biogas; and an ammonia recovery device for stripping ammonia from digestion products generated from the anaerobic digestion process in the anaerobic digestion tank, and purifies the digestion products. The system can reduce greenhouse gases and odors generated by livestock manure, generate biogas for use as an energy resource, and purify liquid livestock manure for use as cleaning water or discharge.

Description

Money storage and processing system

[0001] The present invention relates to a pig manure storage and processing system, and more specifically, to a pig manure storage and processing system capable of reducing greenhouse gases and odors generated from livestock manure, generating biogas to be used as an energy resource, and purifying liquid livestock manure to be used as washing water or discharged.

[0002] The number of livestock raised has increased due to increased consumption of livestock products, and the annual amount of livestock manure generated has increased by 11.6% over the past 10 years.

[0003] This increase in livestock waste production has led to a rise in complaints about odors from livestock farming, and continued environmental issues such as water pollution and soil nutrient overload have been raised. Treatment technologies for livestock waste include composting, liquefaction, and purification.

[0004] Composting is a process in which organic matter is broken down and stabilized by microorganisms, excluding liquid fertilizer, by fermenting livestock manure. The composting process is a process to control the carbon / nitrogen ratio contained in organic matter while simultaneously decomposing and separating harmful components in advance. Liquefaction is a process in which organic matter is broken down and stabilized by microorganisms, by fermenting livestock manure into a liquid form and containing fertilizer components. Purification treatment includes a biological treatment process that uses microorganisms to turn pollutants such as carbon compounds, nitrogen, and phosphorus contained in livestock manure into sludge and remove them from the reactor, a physical treatment process that removes pollutants by separating livestock manure into solid and liquid, and a chemical treatment process that uses chemicals to remove soluble organic and inorganic substances.

[0005] However, even with existing livestock waste treatment technologies, greenhouse gases like methane are increasing rather than decreasing. This has sparked renewed discussion about greenhouse gas emissions from livestock waste and strengthened regulations on the livestock industry. The Ministry of Environment has announced the enforcement decree and enforcement rules of the Act on Promotion of Production and Utilization of Biogas from Organic Waste Resources (Biogas Act), which sets long-term biogas production targets and the scope of mandatory private biogas producers.

[0006] Therefore, at least 80% of the maximum production from organic waste resources such as sewage sludge and manure must be produced as biogas by 2050. Accordingly, the development of a system that reduces greenhouse gas emissions from livestock manure while also enabling the recycling of livestock manure is essential.

[0007]

[0008] [Prior Art Literature]

[0009] [Patent Document]

[0010] Patent Publication No. 10-2007-0021335

[0011]

[0012] The present invention was invented to improve the above problems, and to provide a pig manure storage and processing system that can reduce greenhouse gases and odors generated from livestock manure, generate biogas and utilize it as an energy resource, and purify the liquid form of livestock manure and utilize it as washing water or discharge it.

[0013] In particular, the present invention provides a pig manure storage and processing system that can minimize the amount of methane emitted during the pig manure processing process before it is recovered as biogas by measuring the amount of methane that may be generated when pig manure is stored in a slurry pit of a pigsty for a long period of time using a sensor and immediately processing the pig manure slurry when the amount of methane generated exceeds an appropriate amount.

[0014] In order to achieve the above object, the present invention can provide a pig manure storage and processing system comprising: a sensor for measuring the concentration of methane gas in a slurry pit of a pigsty; a collecting tank into which slurry from the slurry pit flows when the concentration of methane gas measured by the sensor is above a certain range; an anaerobic digestion tank for anaerobically digesting the slurry in the collecting tank to produce biogas; and an ammonia recovery device for stripping ammonia from the digestate produced in the anaerobic digestion process of the anaerobic digestion tank, and characterized in that the digestate is purified.

[0015] Here, the sensor is a chemical sensor, and when the concentration of methane gas measured by the chemical sensor is 0.5% or more, the slurry of the slurry pit flows into the collecting tank.

[0016] At this time, the chemical sensor is characterized in that it is installed in a floating chamber above the slurry pit of the pigsty.

[0017] And, it is characterized by including a solid-liquid separator that centrifuges the stripped digestate in the ammonia recovery device.

[0018] And, it is characterized in that the solid matter of the digestate separated by centrifugation by the solid-liquid separator is composted and the liquid matter is purified.

[0019] And, it is characterized by further including a dehumidification and desulfurization device for the biogas.

[0020] And, it is characterized by further including an energy production unit that produces electricity or heat using the biogas.

[0021] In addition, the ammonia recovery device is characterized in that temperature or pressure can be controlled.

[0022] In addition, the above-mentioned money storage and processing system is characterized by further including an aeration tank for aerating the liquid separated by centrifugation in the solid-liquid separator, and a pure oxygen system unit for increasing the dissolved oxygen concentration by receiving the liquid aerated in the aeration tank.

[0023] In addition, the pure oxygen system unit is characterized by including an oxygen generator that generates oxygen, a nanobubble device that receives a liquid aerated from the aeration tank, receives oxygen from the oxygen generator, and injects oxygen into the aerated liquid, and an oxygen dissolution tank that increases the dissolved oxygen concentration of the liquid injected with oxygen from the nanobubble device.

[0024] In addition, the above-mentioned money storage and processing system is characterized by purifying the liquid and using it as washing water or discharging it.

[0025] In addition, the above-mentioned money storage and processing system is characterized by further including a purification unit for purifying the liquid so that the liquid can be used as the washing water.

[0026] In addition, the purification unit is characterized by including an aerobic microbial circulation tank that aerobically digests the liquid substance with increased dissolved oxygen concentration, and a purifier that purifies the aerobically digested liquid substance.

[0027] In addition, the above-mentioned wastewater storage and treatment system is characterized by including a blower room including a dissolved air flotation (DAF) device for purifying the liquid material so that the liquid material can be purified and discharged, an MBR (Membrane Bio-Reactor) treatment device for filtering the liquid material through a precision filtration membrane and discharging it, or an RO filter (Reserve Osmosis Membrane filter) for purifying the liquid material.

[0028] In addition, the above-mentioned money storage and processing system is characterized by further including a discharge tank.

[0029]

[0030] According to the present invention having the above configuration, the following effects can be achieved.

[0031] The manure storage and processing system of the present invention can reduce the odor caused by livestock manure, generate high-purity methane as biogas and use it as an energy resource, and purify the liquid phase of livestock manure and use it as washing water or discharge it.

[0032] In addition, by measuring the amount of methane that can be generated when pig manure is stored in the slurry pit of a pigsty for a long period of time using a sensor and immediately transferring the pig manure slurry to a collection tank for processing when the amount of methane generated exceeds an appropriate amount, the amount of methane emitted during the pig manure processing process before it is recovered as biogas can be minimized and the amount of biogas produced for use as energy can be increased.

[0033] FIG. 1 is a conceptual diagram illustrating the overall structure of a money storage and processing system according to one embodiment of the present invention.

[0034] The advantages and features of the present invention and the method for achieving them will become clear with reference to the embodiments described in detail below together with the accompanying drawings.

[0035] However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

[0036] The embodiments herein are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention.

[0037] And the present invention is defined only by the scope of the claims.

[0038] Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques are not specifically described to avoid obscuring the present invention.

[0039] Additionally, throughout the specification, the same reference numerals refer to the same components, and the terminology used (referred to) in this specification is for the purpose of describing embodiments and is not intended to limit the present invention.

[0040] In this specification, the singular includes the plural unless specifically stated otherwise in the phrase, and the reference to an element or action as “including (or comprising)” does not exclude the presence or addition of one or more other elements or actions.

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in the sense commonly understood by a person of ordinary skill in the art to which the present invention belongs.

[0042] Also, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless they are defined otherwise.

[0043]

[0044] Hereinafter, a preferred embodiment of the present invention will be described with reference to the attached drawings.

[0045] First, FIG. 1 is a conceptual diagram illustrating the overall structure of a money storage and processing system according to another embodiment of the present invention.

[0046]

[0047] The present invention can be applied to an embodiment that largely includes a sensor (100), a water collection tank (200), an anaerobic digestion tank (300), and an ammonia recovery device (400) as shown in FIG. 1.

[0048] The sensor (100) is provided to measure the concentration of methane gas in the slurry pit (500) of the pigsty.

[0049] The collection tank (200) collects the slurry from the slurry pit (500) before transferring it to the anaerobic digestion tank (300) for treatment.

[0050] The slurry in the slurry pit (500) of the pigsty is stored in the slurry pit (500) for a considerable period of time before being transferred to the collection tank (200) and processed.

[0051] However, the time at which methane begins to be produced and the amount of methane produced vary depending on external environmental factors such as temperature, humidity, and atmospheric pressure.

[0052] Therefore, as methane is excessively generated while the slurry is stored in the slurry pit (500), a large amount of methane may be released within the slurry pit (500) and the treatment system.

[0053] The pig manure storage and processing system of the present invention includes a sensor (100) capable of measuring the concentration of methane gas in a slurry pit (500) of a pigsty, and measures the amount of methane generated in the slurry pit (500) of the pigsty, so that when the amount of methane generated exceeds an appropriate amount, the pig manure slurry is immediately transferred to a collection tank (200) for processing.

[0054] Accordingly, the amount of methane emitted from the slurry pit (500) or during the manure treatment process before being recovered as biogas can be minimized.

[0055] The sensor (100) described above can use a known chemical sensor for measuring methane concentration.

[0056] When the concentration of methane gas measured by the chemical sensor is 0.5% or higher, it is desirable to immediately process the slurry from the slurry pit (500) by allowing it to flow into the collection tank (200).

[0057] The above sensor (100) is installed in a floating chamber (510) above the slurry pit (500) of the pigsty.

[0058] The anaerobic digestion tank (300) is provided to produce biogas by anaerobically digesting the slurry in the collection tank (200).

[0059] The ammonia recovery device (400) is for ammonia stripping of the digestate generated in the anaerobic digestion process of the anaerobic digestion tank (300).

[0060] Here, the anaerobic digestion process is a process in which organic matter slurry is decomposed without an external electron acceptor to produce biogas, and ultimately converted into methane (CH₄), the most reduced form of carbon.

[0061] Since biogas is produced by directly using slurry as a raw material, it does not require any other energy input and is therefore classified as renewable energy. Therefore, increasing biogas production is more effective in preventing global warming.

[0062] The present invention can be applied to the above-described embodiments, and of course, the following various embodiments can be applied.

[0063]

[0064] First, in order to enable smooth methane concentration measurement of the sensor (100) while placed in a slurry pit (500), a floating chamber (510) in which the sensor (100) is mounted may be further equipped with a mooring means, including a rope or chain, to prevent shaking or loss, although not specifically shown, and applications and modifications such as fixing the mooring means to one side of the slurry pit (500) are also possible.

[0065] The aforementioned floating chamber (510) may be placed at one point inside the slurry pit (500) and the methane concentration may be measured with a single sensor (100), or, for more accurate measurement of the methane concentration, multiple floating chambers (510) may be placed at multiple points inside the slurry pit (500) and multiple sensors (100) may be installed within the floating chamber.

[0066]

[0067] Meanwhile, in order to allow the slurry in the slurry pit (500) to immediately flow into the collection tank (200) when the concentration of methane gas measured by the sensor (100) is 0.5% or more, it is preferable to further provide an electronic valve (530) that can be remotely opened and closed through a server (S) or an administrator's terminal (T) via a network (N) on a channel or pipe (520) connecting the slurry pit (500) and the collection tank (200).

[0068] Meanwhile, the gas generated in the anaerobic digestion tank (300) needs to be dehumidified and desulfurized in order to be used as fuel for boilers, etc.

[0069] Accordingly, it may include a dehumidifier (310) capable of removing moisture contained in the gas generated in the anaerobic digestion tank (300), and may further include a dry desulfurization device (320) for desulfurization of the gas.

[0070] That is, biogas from which moisture has been removed through a dehumidifier (310) is desulfurized through a dry desulfurization device (320) and can be used as fuel for a combustor or boiler, or can be recycled as a heat source to increase biogas production in an anaerobic digestion tank (300).

[0071]

[0072] Meanwhile, the present invention may further include a solid-liquid separator (600) that centrifuges the stripped digestate from the ammonia recovery device (400).

[0073]

[0074] Solids are composted from the digested material separated by centrifugation using a solid-liquid separator (600) and liquids are purified.

[0075] In addition, it is preferable that the ammonia recovery device (400) described above be capable of controlling temperature or pressure in order to increase the ammonia recovery rate.

[0076] The ammonia recovery device (400) recovers ammonia using ammonia stripping, i.e., an ammonia stripping method.

[0077] For ammonia stripping, the ammonia recovery device (400) may further include an ammonia reaction tank (410) and a blower (420) as shown in FIG. 2.

[0078] The ammonia reactor (410) and blower (420) are connected to the upper side of the ammonia recovery device (400).

[0079] In the ammonia reaction tank (410), an alkaline agent is injected to raise the pH to 11 or higher for the physical and chemical removal of ammonia, and the resulting solution is injected into the ammonia recovery device (400).

[0080] At the same time, the blower (420) blows air from the upper side of the ammonia recovery device (400) so that ammonia is forcibly injected into the storage tank.

[0081] Accordingly, the ammonia stripped by the ammonia recovery device (400) is stored in the ammonia recovery storage tank (430) connected to the ammonia recovery device (400).

[0082] As described above, it is preferable that the ammonia recovery device (400) further include a recovery controller (450) capable of controlling temperature or pressure in order to increase the ammonia recovery rate.

[0083] Factors that affect ammonia stripping include temperature, pressure, and pH.

[0084] For the first factor, temperature, the higher the temperature, the higher the stripping efficiency, and the lower the temperature, the lower the stripping efficiency.

[0085] Taking this into account, the recovery controller (450) can increase the temperature inside the ammonia recovery device (400) to the highest value within the set range to increase the stripping efficiency.

[0086] For the second factor, pressure, the ammonia stripping efficiency varies depending on the airflow, but the stripping efficiency can be increased by supplying appropriate air.

[0087] Taking this into account, the recovery controller (450) can also control the pressure variability by controlling the air supply amount while controlling the rpm of the blower (420).

[0088] For the third factor, pH, the stripping efficiency is maximum when the pH is 11 or higher, and the stripping efficiency decreases as the pH falls below 11.

[0089] Taking this into account, the recovery controller (450) can check the pH in the ammonia reactor (410) in real time and vary the amount of alkaline agent input so that the pH becomes 11 or higher.

[0090]

[0091] Meanwhile, a plurality of aeration tanks (700) may be additionally provided to aerate the liquid separated by centrifugation in the high-liquid separator (600).

[0092] Of course, it is also possible to additionally provide a pure oxygen system (710) that supplies aerated liquid from the aeration tank (700) to increase the dissolved oxygen concentration.

[0093] Here, the pure oxygen system unit (710) may include an oxygen generator (711) for generating oxygen to increase the concentration of dissolved oxygen in the liquid.

[0094] At this time, the pure oxygen system unit (710) may include a nanobubble device (712) that receives aerated liquid from an aeration tank (700) and injects oxygen into the aerated liquid by receiving oxygen from an oxygen generator (711).

[0095] Additionally, the pure oxygen system unit (710) may include an oxygen dissolution tank (713) provided to increase the dissolved oxygen concentration of the liquid injected with oxygen from the nanobubble device (712).

[0096] Here, the purified liquid can be used as washing water or discharged.

[0097] At this time, a purification unit (800) may be additionally provided to purify the liquid so that the liquid can be used as washing water.

[0098] This purification unit (800) may include an aerobic microbial circulation tank that aerobically digests liquid matter with an increased dissolved oxygen concentration.

[0099] Additionally, the purification unit (800) may include a purifier (810) for purifying the aerobic digested liquid.

[0100]

[0101] In addition, the present invention may further include a blower room including a dissolved air flotation (DAF) device for purifying liquid water so that purified liquid water can be discharged, an MBR (Membrane Bio-Reactor) treatment device for filtering liquid water through a precision filtration membrane and discharging it, and an RO filter (Reserve Osmosis Membrane filter) for purifying liquid water.

[0102]

[0103] Meanwhile, the present invention can discharge purified liquid directly into a river or lake, but it is preferable to additionally provide a discharge tank (900) for temporary storage of the finally purified liquid before final discharge.

[0104]

[0105] As described above, it can be seen that the present invention has as its basic technical idea the provision of a pig manure storage and processing system that can reduce greenhouse gases and odors generated from livestock manure, generate biogas and utilize it as an energy resource, and purify the liquid form of livestock manure and utilize it as washing water or discharge it.

[0106] And, of course, many other modifications and applications are also possible for those with common knowledge in the industry within the scope of the basic technical idea of ​​the present invention.

Claims

1. A sensor that measures the concentration of methane gas in the slurry pit of a pigsty; A collecting tank into which slurry from the slurry pit flows when the concentration of methane gas measured by the above sensor is above a certain range; An anaerobic digestion tank that produces biogas by anaerobically digesting the slurry in the above-mentioned collecting tank; and Including an ammonia recovery device for ammonia stripping of the digestate produced in the anaerobic digestion process of the above anaerobic digestion tank, A waste storage and processing system characterized by purifying the above-mentioned waste.

2. In claim 1, A slurry storage and treatment system, characterized in that the sensor is a chemical sensor, and when the concentration of methane gas measured by the chemical sensor is 0.5% or more, the slurry of the slurry pit flows into the collecting tank.

3. In claim 1, A pig manure storage and processing system, characterized in that the chemical sensor is installed in a floating chamber above the slurry pit of the pigsty.

4. In claim 1, A slurry storage and processing system characterized by including a solid-liquid separator for centrifuging the stripped digestate from the ammonia recovery device.

5. In claim 4, A pig manure storage and processing system characterized by composting the solid matter of the digestate separated by the above-mentioned high-liquid separator and purifying the liquid matter.

6. In claim 1, A pig manure storage and processing system further characterized by including a dehumidification and desulfurization device for the biogas.

7. In claim 1, A pig manure storage and processing system further comprising an energy production unit that produces electricity or heat using the biogas.

8. In claim 1, A slurry storage and processing system characterized in that the above ammonia recovery device is capable of controlling temperature or pressure.

9. In claim 4, An aeration tank for aerating the liquid separated by centrifugation in the above high-liquid separator, A pig waste storage and treatment system characterized by further including a pure oxygen system section that increases the dissolved oxygen concentration by supplying the aerated liquid from the above aeration tank.

10. In claim 9, The above pure oxygen system section, An oxygen generator that generates oxygen, A nanobubble device that receives aerated liquid from the aeration tank and injects oxygen into the aerated liquid by receiving oxygen from the oxygen generator; A waste storage and processing system characterized by including an oxygen dissolution tank for increasing the dissolved oxygen concentration of liquid water injected with oxygen from the nanobubble device.

11. In claim 5, A waste storage and processing system characterized by purifying the liquid and using it as wash water or discharging it.

12. In claim 11, A waste storage and processing system characterized by further including a purification unit for purifying the liquid so that the liquid can be used as the washing water.

13. In claim 12, The above purification unit, An aerobic microbial circulation tank that aerobically digests the liquid with increased dissolved oxygen concentration, A waste storage and processing system characterized by including a purifier for purifying the above-mentioned digested liquid.

14. In claim 11, In order to purify and discharge the above liquid, Dissolved Air Floatation (DAF) device for purifying the liquid, or An MBR (Membrane Bio-Reactor) treatment device that filters the above liquid through a precision filtration membrane and discharges it, or A waste storage and treatment system characterized by including a blower room including a RO filter (Reserve Osmosis Membrane filter) for purifying the liquid.

15. In claim 1, A waste storage and treatment system characterized by further comprising a discharge tank.

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