KR101565503B1 - Method for Liquid Fertilizer of livestock excretions using the Selective aeration - Google Patents

Abstract

The present invention relates to a method for liquefied fertilizer of livestock excretion. The method for liquefied fertilizer of livestock excretion comprises: a pre-processing step of separating livestock excretion into sludge that is a solid material, and a liquid material by using an adulteration eliminator (10) and a solid-liquid separator (20) in order to perform a pre-processing; a high aeration fermentation step of transferring the liquid material separated from the pre-processing step to a first anaerobic liquefied fertilizer bath (100) so as to contact anaerobic microorganisms supplied from a microorganism cultivation bath (700) and of fermenting by being supplied with oxygen from an air diffuser (110) and an oxygen transfer underwater mixer (120); and a low aeration fermentation step of transferring the liquid material that has gone through the high aeration fermentation step to a second anaerobic liquefied fertilizer bath (200) and of fermenting by maintaining a concentration of dissolved oxygen (DO) in a predetermined value range by using at least one of the air diffuser (110) and the oxygen transfer underwater mixer (120).

Description

[0001] The present invention relates to a method for livestock manure liquefaction,

The present invention relates to a method for livestock manure liquefaction, which comprises a pretreatment step of separating a solid material sludge and a liquid material by using a soil remover (10) and a solid-liquid separator (20) for pretreatment, The liquid material separated in the pretreatment step is transferred to the first aerobic lyophilization tank 100 and then brought into contact with the aerobic microorganisms supplied from the microorganism culture tank 700 and is supplied to the anaerobic tank 110 and the oxygen transfer water mixer 120, The aerobic fermentation step of feeding the liquid material to the second aerobic liquefying furnace 200 and supplying the aerobic aerobic liquefying gas to the anaerobic tank 110 or the oxygen transfer water mixer 120 ) In which the dissolved oxygen concentration (DO) is maintained within a predetermined value range; The present invention relates to a method for livestock manure liquefaction.

With the rapid economic growth in Korea, all industries are progressing into intensive industrialization, and the livestock industry has developed along with this. As the income level of the people increases, the consumption of animal products continues to increase. As a result of the high growth of the livestock industry, the annual domestic livestock manure output has increased by 380,000 tons from 42.69 million tons in 2010 to 44.69 million tons in 2012 . Here, livestock manure includes livestock manure water and anaerobic digesters. Conventionally, the treatment of livestock manure was mainly used as an organic fertilizer by composting the raw material (rice husk, sawdust) which was mainly used for solid-liquid separation, and the dehydrated filtrate was discharged to the river after the dumping or purification treatment. Because the pollutant load is high due to the characteristics of livestock manure, the treatment cost increases astronomically to meet the discharge standard at the point when the water quality standard of effluent is strengthened. Therefore, alternative methods such as livestock manure recycling method or livestock manure energy were realized.

Generally, methods for treating livestock manure include combustion treatment, compression drying treatment, anaerobic digestion treatment, aerobic composting using microorganisms, and by-products such as compost or liquid fertilizer can be obtained. As a result of the prohibition of marine emissions in January 2012, the ratio of recycling has increased. In 2010, the recycling rate stood at 86.6%, and at the end of 2012, 88.7% (composting 81.0%, fertilizer 7.7%).

Composting of livestock manure is the most effective way to treat solids. Compost made from livestock manure is superior in quality and can be transported to agricultural land because it can be transported over a long distance. However, nitrogen, which affects the quality of compost, is lost due to aerobic reaction during the composting process, It is disadvantageous that the operation cost due to the use of the machine installation cost and the supplementary cost of the composting facility is excessive. In order to compost the liquid manure having the water content of 94.4% or more, excessive amount of the raw materials (rice husk, sawdust) used as the moisture control material is added and the operating cost is increased. Also, since the ratio of carbon to nitrogen (C / N ratio) is high, compost is not well absorbed and HRT is increased, resulting in an increase in the site area of the treatment facility.

The livestock manure filtrate, which is generated by solid-liquid separation of livestock manure, is decomposed by microorganisms. The livestock manure method is divided into anaerobic digestion method and aerobic liquefaction method depending on whether there is aeration.

Anaerobic digestion is also referred to as "methane fermentation" and its main purpose is to recover energy, methane, simultaneously with wastewater or waste treatment. It decomposes decomposable organic matter in an oxygen-free anoxic state and converts it to methane. It is included in the biological category. The initial anaerobic microorganism acts to hydrolyze and acid fermentation, and at the point where oxygen is depleted, the organized anaerobic methane bacteria form methane. In the anaerobic digestion method, the livestock manure filtrate is brought into contact with the anaerobic microorganisms, such as the fermenting bacteria and the methanogenic bacteria, to produce the biogas, thereby providing additional economic value. As to the method of manufacturing the liquid fertilizer using the anaerobic digestion method, there are a number of inventions including the " Method of producing high-efficiency liquid fertilizer "(Korean Patent Registration No. 10-0725968) of Patent Document 1 below. The activity conditions of these anaerobic microorganisms are temperature (35 at high temperature), pH, Alk. . The anaerobic digestion facility should have heating and power generation facilities, biogas purification and storage facilities. An anaerobic digestion facility can produce and supply livestock by treating livestock manure, but it has a disadvantage that it is difficult to meet the livestock standards.

In addition, the waste liquid generated from the anaerobic digestion facility can be discharged to the sewage treatment facility or produced in association with the liquid facility. In case of treatment in connection with the sewage treatment facility, the risk of high influx load of the sewage treatment plant should be reduced, and there is a problem that the chemicals of the downstream advanced treatment facility are overused. On the other hand, in case of treatment in connection with the liquefaction facility, the temperature of the effluent from the anaerobic digestion treatment water flows into the liquefaction facility from 33 to 35 ° C to ensure the adaptability of the activated sludge to the initial temperature. It has the advantage that it is possible.

On the other hand, aerobic liquefaction in contrast to the livestock manure filtrate is contacted with aerobic microorganisms, nitrifying bacteria and acid-producing fungi, followed by agitation and aeration, followed by decomposition by aerobic microorganisms such as composting, which is called aerobic liquefaction. In the aerobic liquefaction process, continuous aeration and intermittent aeration are used. In case of initial contact between aerobic microorganisms and livestock effluent, the air supply is required to be 0.05 (per 1.0ton) (DO 0.2 ~ 0.5ppm) is required per ton of air.

In order to aerobically digest the livestock manure filtrate, the growth conditions of aerobic microorganisms must be satisfied. Nutrients, dissolved oxygen (DO), temperature, and pH are necessary conditions. Nutrients include organic matter and total nitrogen ), And total person (TP). Total nitrogen (TN) is a nutrient of aerobic microorganisms and is one of the important factors in the quality of livestock. Generally, in the liquid erosion method, anoxic tank and aeration tank anaerobic tank are sequentially operated to oxidize nitrogen into nitrite and nitrate by nitrogen bacteria and nitrosomonas, and denitrification with nitrogen gas, TN) is removed. However, according to composting organic fertilizer standards, 0.3% or more of total nitrogen content should be guaranteed. Therefore, in case of aerobic liquefaction, use only aerobic tank and do not go through denitrification process.

Sludge containing aerobic microorganisms is periodically transferred from the end of the liquefaction tank to the bottom of the liquefaction tank so that the impact load and the microbes are mixed in the initial liquefaction tank. Microorganism amount: M) should be maintained. If the proper F / M can not be maintained, smooth composting in the liquefaction tank can not be achieved, which will affect the downstream stage of the process.

Aeration equipment is included to increase dissolved oxygen, and bubbles are generated in the aeration fermentation stage, causing problems in operation and affecting liquid quality. Although a large amount of dissolved oxygen is required in the initial liquefaction, it is necessary to maintain 0.02 ppm of dissolved oxygen because the compost requires a small amount of dissolved oxygen.

In order to stabilize the activity of aerobic microorganisms, the supplied air comes in contact with the filtrate in an upward flow, transfers oxygen, and floats on the water surface. In this case, odor is generated and a separate facility for collecting odor is needed.

Formation of bubbles occurs in the process of injecting air into liquid manure. Formation of the foam layer is an important factor for judging the stable operation of the process, and control of the foam in the aerobic process is very important for stable operation of the process. In general, bubbles are reported to increase when oxygen consumption increases and microbial metabolism becomes active. However, Rozich and Colvin point out that bubble generation is a system stability problem and that excessive bubbles are caused by process instability . It is also pointed out that excessive bubbles occur when the load of organic matter is large. In the high temperature aerobic digestion process, since many bubbles are generated, a mechanical defoamer such as a mechanical cutter should be applied to the fox at a depth of 0.5 to 1.0 m in designing.

Patent Document 1: "Production Method of High-Efficiency Liquid Fertilizer" (Korean Patent No. 10-0725968)

Disclosure of the Invention The present invention has been conceived to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method for aerating a livestock manure filtrate through a selective air supply method for stable composting in a livestock facility, And a method of supplying oxygen by using a device and an oxygen supply water mixer and selectively supplying one of a mixer or an oxygen delivery water mixer in an aeration section.

In order to effectively remove the odor and bubbles generated during aeration, the present invention provides bubbles and odor collection facilities in successive aerobic liquefaction vessels and separates the bubbles into ozone oxidation vessels through a gas-liquid separator performing two functions at the same time And the malodor is sent to the malodor treatment facility to provide a method capable of stable malodor control and liquefaction.

In the meantime, the present invention is characterized in that a plurality of aerobic liquefaction vessels are continuously installed, and the amount of air supplied to each liquefaction tank is selectively supplied to decompose organic matter generated at a high temperature, followed by Nitrobacter and Nitrosomonas at low temperature. It is an object of the present invention to provide a method of aerobic liquefaction in order to satisfy stability and liquor standards as a liquor ratio.

In addition, the object of the present invention is to provide a liquefaction facility including stability by transferring sludge including microorganisms to the aerobic liquefaction tank 1 section at the downstream end of the aerobic liquefaction tank to lower the impact load and maintain the F / M ratio required for decomposing organic matters.

Another object of the present invention is to oxidize ozone in the ozone oxidation tank to the bubbles collected in the aerobic liquefaction tank, to transfer the oxidized carrier liquid into the raw water storage tank, to treat the refractory material in a sludge form through the solid- To the liquefaction facility.

In order to accomplish the above object, the present invention provides a method for livestock manure liquefaction, comprising the steps of: subjecting a sludge, which is a solid material, to a liquid phase using a soil remover (10) and a solid-liquid separator (20) , And the liquid material separated from the primary contaminant remover separated in the pretreatment step is transferred to the first aerobic liquefaction tank (100), and then brought into contact with aerobic microorganisms supplied from the microorganism culture tank (700) An aerobic fermentation step in which oxygen is supplied and fermented through oxygenator 110 and oxygen delivery water mixer 120, and the liquid material having undergone the aeration fermentation step is transferred to a secondary aerobic liquefying furnace 200 , Aeration device (110), or an oxygen delivery water mixer (120) to maintain the dissolved oxygen concentration (DO) in a predetermined numerical value range and ferment the same; And a control unit.

In the fermentation step, the dissolved oxygen (DO) is maintained at 1.0 ppm or higher, and the dissolved oxygen (DO) is maintained at 0.2 to 0.5 ppm in the low-fermentation fermentation step.

A sludge separation step of allowing the liquid material having undergone the low-aerobic fermentation step to pass through the sludge settling tank 300 to settled the sludge and sending the settled sludge to the ozone oxidation tank 600; A ripening step of ripening the liquid material in the liquid storage tank 400; And further comprising:

The deodorizing and bubble removing device 140 is used to deodorize the foam, scum and odor generated in the over-aerobic fermentation step and the low-fermentation fermentation step to spray the ripe solution in the liquid storage tank 400 And the bubble, the scum and the odor generated in the aeration and fermentation stages are collected through the odor and foam collecting device 510 and then transferred to the gas-liquid separator 500 to contain the odor A malodor gas separation step of separating the gas, scum and foam from the gas; And further comprising:

Also, an ozone treatment step of oxidizing the scum and foam separated in the odor gas separation step using the ozone generated in the ozone generator 610 in the ozone oxidation tank 600, and then transferring the scum and foam to the solid-liquid separator 20, A malodor processing step of transferring a gas containing the malodor discharged from the gas-liquid separator 500 and a gas including the malodor trapped in the liquid storage tank 400 to the malodor processing apparatus 800 in the malodor gas separation step ; And further comprising:

According to the present invention, it is possible to efficiently and systematically supply the dissolved oxygen necessary for the microbial reaction to the primary, secondary or higher aerobic liquefaction tank divided into the aeration and the aeration conditions depending on the throughput by the selective aeration method, It is possible to provide an efficient fermentation environment. .

In addition, the amount of air supplied from the aerobic liquefaction tank can be minimized by minimizing the generation of odors by appropriately supplying the air in consideration of the characteristic proportional to the odor, and the operation management cost can be reduced. By the selective aeration method according to the required oxygen amount, It is possible to supply an appropriate amount of oxygen and to minimize the generation of odor.

In addition, the aerobic liquefaction tank is treated with a gas-liquid separator capable of simultaneously removing the bubbles and odors generated during the aeration, the bubbles containing the refractory material are oxidized using ozone, the odor is separated from the gas- So that stable operation and management can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a whole process of a livestock manure processing apparatus in which a method for livestock manure liquefaction in accordance with an embodiment of the present invention is performed.
Fig. 2 is a schematic view of the construction of a first aerobic liquefaction tank or a second aerobic liquefaction tank in which a method for livestock manure liquefaction in accordance with an embodiment of the present invention is performed.
FIG. 3 is a schematic view of an oxygen delivery water mixer used in a method of livestock manure liquefaction in accordance with an embodiment of the present invention.
4 is a schematic diagram of the configuration of a gas-liquid separator used in a method of livestock manure liquefaction in accordance with an embodiment of the present invention.

Hereinafter, a method of livestock manure storage according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

The method for raising livestock manure according to an embodiment of the present invention includes a pre-treatment step, an aeration aeration step, and a low aeration step.

First, the preprocessing step will be described. The low-fermentation fermentation step separates sludge, which is a solid matter, into a liquid phase and a liquid phase using a soil remover (10) and a solid-liquid separator (20) for pretreatment. As shown in FIG. 1, livestock manure Removing coarse material through the impregnation processor 10 and separating the solid phase and the liquid phase through the solid-liquid separator 20 so that the solid phase is transferred to a separate composting facility. In this case, a primary storage tank 11 is provided between the impurity removing unit 10 and the solid-liquid separator 20 for controlling the operating flow rate and temporarily storing the liquid, and the solid-liquid separator 20 and the primary aerobic liquefaction tank It is preferable that a secondary storage tank 21 is further installed between the first storage tank 100 and the second storage tank 21. In this case, the liquid phase is transferred to the secondary storage tank 21 and then to the first aerobic liquefaction tank 100 at a constant flow rate.

Next, the super-aeration fermentation step will be described. In the fermentation step, the liquid material separated from the impurity removing unit is transferred to the first aerobic lyophilization tank 100, and then brought into contact with the aerobic microorganisms supplied from the microbial culture tank 700, And is supplied with oxygen through a passing water mixer 120 to ferment.

In the microorganism culture tank 700, nitrifying microorganisms such as Nitrobacter and Nitrosomonas or acid producing bacteria such as acid producing Bacillus sp. Are cultured, and the liquid material (livestock manure filtrate) Is supplied to one section of the primary aerobic livestock tank (100) to be supplied.

 The first aerobic liquefaction tank (100) is controlled by a selective aeration system according to the amount of oxygen required in each section. When the initial concentration of organic matter is high, the amount of bubbles is maximized and operation problems occur. Accordingly, the above-mentioned problems can be solved by dividing the section in the first aerobic liquefaction tank 100 into first, second, third, or more sections according to the inflow amount to adjust the aeration amount. The concentration of dissolved oxygen is required to be 0.05 (DO 1.0 ppm or more) per 1 ton in the above-mentioned aeration fermentation step, and 0.02 (low aeration DO 0.2 to 0.5 ppm) per 1 ton is required in the low-aeration fermentation step. Accordingly, by using the air diffuser 110 and the oxygen transfer water mixer 120, it is possible to minimize the occurrence of bubbles and odors by appropriately operating according to the fluctuation of the inflow concentration and the organic amount, So that the sedimentation rate is reduced.

The air diffuser 110 generates air in the form of fine particles to maximize the contact area with the object to be treated and to aeration in a short time. However, when the feed rate is maximized, the amount of bubble generation increases. If the amount of air supplied to control the bubble is decreased, the stirring rate may be lowered and the organic matter decomposition rate may be lowered. In order to secure such a problem, the mixer 120 in the oxygen transfer water as shown in FIG. 2 is used at the same time to increase the stirring rate.

As shown in FIGS. 2 and 3, the oxygen transferring water mixer 120 mixes the air supplied to the air buffer 130 to the rear of the impeller 121 of the oxygen transfer water mixer 120 through the air transfer pipe 123, So that the air and the manure are mixed and discharged from the air mixing buffer 122. At this time, the air is crushed by the impeller 121 and mixed with the manure to increase the oxygen transmission rate.

The diffuser 110 and the oxygen transfer water mixer 120 have different purposes. In the case of the air diffuser 110, oxygen is mainly supplied for the purpose of supplying oxygen and stirring, and the mixer 120 is mainly used for stirring the oxygen. Therefore, it is possible to provide a stable phase problem occurring in the initial aerobic liquefaction tank by simultaneous operation or selective single operation and a method for quickly inducing stabilization of the process.

In the above-mentioned fermentation step, the germination and proliferation of Bacillus sp. Occurs by maintaining the maximum oxygen supply (DO 1.0 ppm or more). Bacillus sp. Uses Saccharides, Organic acid, Alcohols, and it grows by using Ammonium as a nitrogen source. It also includes materials such as cellulose, which is difficult to decompose. Odor compounds such as Ammonia and H ₂ S that are generated during the liquefaction process can also be directly ingested or decomposed.

In the above fermentation step, the organic substance concentration is high and the amount of air to be supplied is large. The method of controlling the bubbles generated at this time is to reduce the air supply amount to suppress the amount of bubbles or mechanically remove the bubbles. When the air amount of the air diffuser 110 is reduced to lower the air supply amount, the amount of bubble generation is reduced, but the stirring rate in the liquid tank is lowered and the sludge is settled. At this time, it is possible to maximize the oxygen supply and the stirring rate by using the oxygen transfer water mixer 120 that simultaneously performs the stirring and the oxygen transfer.

In this aeration process, the decomposition of organic matter is a biological reaction to obtain the cell synthesis and energy required for the microorganism. The molecular formula of the microorganism is generally expressed as C ₆ H ₇ O ₂ N, Is C ₆₀ H ₈₇ O ₂₃ N ₁₂ P. In order to synthesize microbial cells, various nutrients are needed. Since nitrogen and one of indispensable nutrients are necessary, nitrogen and phosphorus are removed together with a small amount in the removal process of organic matter. The reaction of microorganisms using molecular oxygen (O2) as an electron acceptor is called aerobic and can be explained by the following chemical reaction formula.

As shown in the above equation, organic matter in the manure is converted into new microbial cells, CO2, etc. and is removed. At this time, 0.12 kg of nitrogen and 0.025 kg of phosphorus are consumed to synthesize 1 kg of C ₅ H ₇ O ₂ N.

Next, the low-aeration fermentation step will be described. The low-aerobic fermentation step may be performed by transferring the liquid material having undergone the aeration-aeration step to a second aerobic liquefying unit 200, and using the at least one of the aerating unit 110 and the oxygen transfer water mixer 120 to dissolve And maintaining the oxygen concentration (DO) within a predetermined numerical value range. In this case, it is preferable to use only the oxygen transferring water mixer 120 in the low-aerobic fermentation step to maintain the stirring rate at a maximum while maintaining a proper oxygen supply amount.

In the low-aerobic liquefaction step, the dissolved oxygen concentration (DO) is maintained in the range of 0.2 to 4.5 ppm, preferably 0.2 to 0.5 ppm by using the oxygen transfer water mixer 120, Sporulation is induced and the temperature in the second liquid tank 200 is maintained at 25 to 50 ° C by using the energy generated in the reaction, thereby inducing liquid aging. In this case, since the sludge generated at the downstream of the second liquid tank 200 contains aerobic microorganisms, the sludge is transferred to the inlet of the first liquid tank 100 to properly sift the activated sludge microorganisms (MLSS) .

Meanwhile, the present invention provides a sludge separation method comprising: a sludge separation step of allowing the liquid material having undergone the low-aerobic fermentation step to pass through a sludge settling tank 300 to deposit sludge and sending the sludge to the ozone oxidation tank 600; And a ripening step of ripening the liquid material in the liquid storage tank (400).

In addition, deodorization and bubble elimination are performed by spraying the moss liquid in the liquid storage tank 400 by using the deodorizing and defoaming device 140 for the foam, scum and odor generated in the over-aerobic fermentation step and the low- The method further comprising the step of: In this case, it is preferable that the bubbles and odors generated in the aeration process including the fermentation stage of the aeration and the fermentation stage of the low aeration are controlled primarily by the deodorizing and defoaming device 140. Meanwhile, when the liquid fertilizer is fed at the rear end of the liquid storage tank 400 and sprayed from above the first liquid storage tank 100 or the second liquid storage tank 200, the odor is controlled by the absorption reaction and the microbial reaction, The bubbles are removed by the physical reaction by the mature solution. The reaction mechanism of the representative substances of odor is as follows.

The formation of bubbles is a factor for judging the stable operation of the process. Generally, it occurs at the stage of increase of oxygen consumption, active metabolism of microorganisms, and the amount of generation increases as the load of organic matter increases. Therefore, it is necessary to have a clearance of 0.5 ~ 1m from the upper part considering the margin in the installation of the liquid tank, and mechanical removal organs are necessary.

The gas-liquid separator 500 as shown in FIG. 4 collects the foam, scum and odor generated in the fermentation step and the low-fermentation fermentation step through the malodor and foam collecting device 510, And separating the scum and foam from the gas containing the malodorous material. In this case, the gas-liquid separator 500 separates the separating swash plate 510 with a minimum volume in order to separate the odor and bubbles, which are gaseous, at a maximum efficiency, and controls the bubbles with the spraying vesicle nozzle 530 in an emergency .

In this case, the bubbles generated in the liquefaction are composed of 91% of water and 8% of solid matter, and the solid matter contains a refractory material which is difficult to be decomposed into 76% of the intangibles and 24% of the organic composition, . Accordingly, the present invention is characterized in that the scum and foam separated in the above-mentioned odor gas separation step are oxidized in the ozone oxidation vessel 600 using ozone generated in the ozone generator 610 and then transferred to the solid-liquid separator 20 And further comprising: That is, the foam separated from the gas-liquid separator 500 is firstly decomposed in the ozone oxidation vessel 600 through the oxidation reaction by ozone, and the decomposed materials decomposed are separated again in the solid-liquid separation facility 10 .

It is preferable that the ozone oxidation tank 600 generates and supplies ozone by the silent discharge method. The silent discharge method of the ozone generator 610 has energy efficiency, stability of stability, and convenience of operation control. When a dielectric such as glass or ceramics is sandwiched between electrodes and air or oxygen is blown therebetween, And ozone is generated between the dielectric and the dielectric.

In case of silent discharge method, the ozone generation efficiency varies depending on the ozone concentration. However, ozone concentration of 10 ~ 35 g / in case of using air as raw material and 50 ~ 150 g / in case of using oxygen as raw material can be obtained. for ℃ when the oxygen raw material 10 ~ 13kwh / kg-O _3, and when the air as a raw material is _{15 ~ 20kwh / kg-O 3} . When ozone is oxidized to ozone, the amount of ozone is 40 ~ 60mg / L.

Meanwhile, in the malodorous gas separation step, the gas containing odor discharged from the gas-liquid separator 500 and the gas including the odor collected in the liquid storage tank 400 are transferred to the malodor processing apparatus 800 And a malodor processing step for processing the malodor.

Meanwhile, the slurry having been composted in the first and second aerobic liquefaction vessels 100 and 200 is transferred to the settling tank 300 to separate the sludge, and the separated sludge is transferred to the ozone oxidation tank 600. The sludge-separated sludge is supplied intermittently by the mixer 120 in the oxygen transferring water in the sludge storage tank 400 to increase the quality of the sludge by the anaerobic condition, and after 60 to 90 days storage period, Shipped.

In the foregoing, optimal embodiments have been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Dirt remover 11: Primary reservoir
20: Solid-liquid separator 21: Secondary reservoir
30: blower
100: the first aerobic liquefaction tank
110: Diffuser 120: Oxygen transfer underwater mixer
121: impeller 122: air mixing buffer
123: Air intake pipe
130: Air buffer 140: Deodorizing and defoaming device
200: Second aerobic liquefaction tank
300: sludge settling tank
400: liquid storage tank
500: gas-liquid separator 510: odor and foam collecting device
520: separation swash plate 530: vesicle nozzle
600: ozone oxidation tank 610: ozone generator
700: Microorganism culture tank 800: Odor treatment facility

Claims (5)

A method for livestock manure liquefaction,
A pretreatment step of separating the sludge, which is a solid material, into a liquid phase by using the impurity removing unit 10 and the solid-liquid separator 20 for pretreatment;
The liquid material separated in the pretreatment step is transferred to the first aerobic lyophilization tank 100 and then brought into contact with the aerobic microorganisms supplied from the microorganism culture tank 700. The aerobic device 110 and the oxygen transfer water mixer 120 A step of fermenting the fermentation broth by supplying oxygen through the fermentation step;
The liquid material having undergone the aeration and fermentation step is transferred to the second aerobic lyophilizing tank 200 and the dissolved oxygen concentration DO is increased by using at least one of the air diffuser 110 and the oxygen transferring water mixer 120 A low-aerobic fermentation step of fermenting the fermentation product while maintaining the fermentation state at a predetermined value range;
The bubbles and odors generated in the aeration and fermentation stages are separated by the gas-liquid separator 500. The bubbles are treated using the ozone oxidation vessel 600, The method comprising the steps of: (a) treating the animal feed liquid with a liquid;
The method according to claim 1,
Wherein the dissolved oxygen (DO) is maintained at 1.0 ppm or higher in the super-aerobic fermentation step, and the dissolved oxygen (DO) is maintained at 0.2 to 0.5 ppm in the low-fermentation fermentation step.
The method according to claim 2,
A sludge separation step of allowing the liquid material having undergone the low-aerobic fermentation step to pass through the sludge settling tank 300 to deposit sludge and sending the precipitated sludge to the ozone oxidation tank 600; Ripening step in the liquid storage tank 400; Further comprising the steps of:
The method of claim 3,
The bubbles and odors generated in the aeration and fermentation stages are separated by the gas-liquid separator 500. The bubbles are treated using the ozone oxidation vessel 600, , The step of processing using < RTI ID = 0.0 >
A deodorizing and bubble removing step of spraying the bubble, scum and odor generated in the fermentation step in the aeration-aeration step and the fermentation step in the aeration step and spraying the juice solution in the liquid storage tank 400 by using the defoaming device 140; ;
The foam, scum, and odor generated in the over-aerobic fermentation step and the low-aerobic fermentation step are collected through the malodor and foam collecting device 510 and then transferred to the gas-liquid separator 500 to remove the odor- A malodorous gas separation step of separating the foam; Further comprising the steps of:
The method according to claim 4,
The bubbles and odors generated in the aeration and fermentation stages are separated by the gas-liquid separator 500. The bubbles are treated using the ozone oxidation vessel 600, , The step of processing using < RTI ID = 0.0 >
An ozone treatment step of oxidizing the scum and foam separated in the odor gas separation step using the ozone generated in the ozone generator 610 in the ozone oxidation tank 600 and then transferring the scum and foam to the solid-liquid separator 20;
A malodor processing step of transferring a gas containing the malodor discharged from the gas-liquid separator 500 and a gas including the malodor trapped in the liquid storage tank 400 to the malodor processing apparatus 800 in the malodor gas separation step ; Further comprising the steps of:

Images