JP4719237B2 - Sewage treatment method for livestock farms - Google Patents

Description

  The present invention relates to a method for treating livestock sewage discharged from a livestock farm.

Conventionally, sewage of livestock products discharged from livestock farms has been treated using a phosphorus-based chemical such as an organic phosphate as a sterilizing agent (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-263588

  However, since phosphorus-based chemicals are used as described in Patent Document 1, there is a problem that bacteria that are effective for the degradation of filth are killed. Further, as another method, a method using a medicine containing a large amount of a chemical substance or a sterilizing / sterilizing agent may adversely affect the surrounding environment. Regardless of whether it is treated with chemicals or not, even if it is treated water that is safe for the human body and the environment, it is finally discharged into the river etc. for disposal (disposal). There was a risk of discomfort in the neighborhood, which could cause neighborhood troubles such as complaints.

  Therefore, the present invention detoxifies and purifies livestock wastewater discharged from livestock farms by deodorizing and purifying livestock wastewater without using pharmaceuticals or sterilizing / sterilizing agents containing a large amount of chemical substances. It is intended to provide a sewage treatment method for livestock farms that can be treated without damaging the environment and without adversely affecting the surrounding environment.

  Therefore, in order to achieve the above-mentioned object, the sewage treatment method for a livestock farm according to the present invention is a mixture of two kinds of livestock sewage discharged from a livestock farm, in which Lactobacillus fermentum and Enterococcus faecium are mixed. Deodorized and purified by lactic acid bacteria to make BOD treated water of 50 ppm to 200 ppm, the treated water flows into a transpiration tank where wood chips and wood sawdust are stored, and the treated water is evaporated to the atmosphere to diverge Perform transpiration treatment.

  In addition, a lactic acid bacteria sewage mixed solution obtained by mixing livestock sewage discharged from a livestock farm and two mixed lactic acid bacteria water obtained by diluting two mixed lactic acid bacteria mixed with Lactobacillus fermentum and Enterococcus faecium is aerated. Aerated in equipment, deodorized and purified by the above-mentioned two types of mixed lactic acid bacteria to make treated water with a BOD of 50 ppm to 200 ppm, and the treated water is allowed to flow into a transpiration tank where wood chips and wood sawdust are stored And the transpiration process which circulates in the transpiration water tank, evaporates the treated water to the atmosphere and emits it while further deodorizing and purifying the treated water with the two mixed lactic acid bacteria contained in the treated water I do.

  According to the sewage treatment method for livestock farms of the present invention, livestock sewage discharged from livestock farms can be deodorized and purified without adversely affecting the environment, and can be evaporated and diffused into the atmosphere. That is, livestock wastewater can be treated without being discharged to the surroundings.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 is an explanatory view showing an embodiment of the present invention.
Livestock sewage 15 such as animal manure discharged from livestock farms raising livestock such as pigs and cattle is stored in a sewage tank T. The stored livestock sewage 15 is sent to the lactic acid bacteria adjusting tank 3 at a predetermined sewage flow rate V ₁ by a sewage supply pump P ₁ . The predetermined wastewater flow rate V ₁ is about 0.2 to 0.8 t / H.
In other words, livestock sewage 15 includes sewage tank T, sewage supply pump P ₁ , piping connecting sewage tank T to lactic acid bacteria adjustment tank 3 through sewage supply pump P ₁ , sewage tank T and sewage supply pump P. ₁ and a sewage supply means 1 comprising valves, instruments and the like disposed in the piping are supplied to the lactic acid bacteria adjusting tank 3.

In addition, a lactic acid bacterium tank 16 in which a lactic acid bacteria water 16 obtained by diluting two mixed lactic acid bacteria mixed with Lactobacillus fermentum and Enterococcus faecium in the lactic acid bacteria adjustment tank 3 is stored. A predetermined lactic acid bacteria water flow rate V ₂ is supplied from Z by a lactic acid bacteria water supply pump P ₂ . The predetermined lactic acid bacteria water flow rate V ₂ is set to about 2 × 10 ⁻³ to 8 × 10 ⁻³ t / H.
In other words, the two-type mixed lactic acid bacteria water 16 includes a lactic acid bacteria tank Z, a lactic acid bacteria water supply pump P ₂ , a pipe connecting the lactic acid bacteria tank Z to the lactic acid bacteria adjustment tank 3 via the lactic acid bacteria water supply pump P ₂ , and a lactic acid bacteria tank Z The lactic acid bacteria water supply means 2 comprising the lactic acid bacteria water supply pump P ₂ and valves and instruments arranged in the pipes supplies the lactic acid bacteria adjustment tank 3.

  Two kinds of mixed lactic acid bacteria use tofu squeezed rice cake as a medium (base material), add 6% of salt to the weight so that general bacteria and bacteria do not grow, and stir to make the moisture content 85-90% adjust. The mixture is stirred for about 20 minutes, and 1% citric acid (orange acid) granules are added as a pH adjuster with respect to the total weight. Adjust the pH to 2.7 or lower. In other words, it creates a strong acid state environment.

  A facultative anaerobic Lactobacillus fermentum and facultative anaerobic Enterococcus faecium are made water-soluble (aqueous solution) in the medium (Okara), stirred for about 30 minutes, and allowed to grow. In summer, it is desirable to perform the above processing within one hour.

1 kg of the cultivated culture medium is put in a synthetic resin bag, for example, a bag made of polyethylene nylon synthetic laminate (35 microns + 20 microns = 55 microns) (length 30 cm × width 25 cm), and the vacuum pressure is −0.3. Deaerate from atmospheric pressure to -0.8 atm to vacuum (anaerobic state).
The deaerated bag (bag containing the cultured medium material) is cultured at a low temperature within 4 ° C. for 30 to 40 days (refrigeration culture).

In the bag in the refrigerator, a neutralization reaction occurs between citric acid for pH adjustment that is acidic and a medium (okara) that is a weakly alkaline vegetable protein.
The neutralization reaction results in a weak acidity of pH 5.6 to 5.8 from a strong acid of pH 2.7. Lactic acid bacteria grow in the bag. In other words, the bag is made to be slightly acidic.

That is, the lactic acid bacterium cultivated by the above-mentioned method is a two-type mixed lactic acid bacterium in which Lactobacillus fermentum and Enterococcus faecium are mixed.
This two-type mixed lactic acid bacterium is a stressed and trained bacterium, and is a facultative anaerobic lactic acid bacterium that works sufficiently to decompose sewage and filth. Moreover, the numerical value of two types of mixed lactic acid bacteria is 10 < ⁶ > -10 < ⁷ > per gram.

This two-type mixed lactic acid bacterium is diluted 30 times to produce a two-type mixed lactic acid bacterium water 16. In addition, you may dilute 2 types mixed lactic acid bacteria 15 to 45 times, and may manufacture 2 types of mixed lactic acid bacteria water.
Then, the two kinds of mixed lactic acid bacteria water 16 is sent from the lactic acid bacteria tank Z by the lactic acid bacteria water supply pump P _{2 at a} predetermined lactic acid bacteria water flow rate V ₂ and supplied to the lactic acid bacteria adjustment tank 3.

The lactic acid bacteria adjustment tank 3 is supplied with livestock sewage 15 with a predetermined sewage flow rate V ₁ and two types of mixed lactic acid bacteria water 16 with a predetermined lactic acid bacterium water flow rate V ₂ . Then, the lactic acid bacteria wastewater mixed liquid 18 obtained by mixing the supplied livestock wastewater 15 and the two kinds of mixed lactic acid bacteria water 16 is stored at a predetermined volume V ₀ . The ratio of the sewage flow rate V ₁ to the predetermined capacity V ₀ is set to 1/200 to 1/10. When the sewage flow rate V ₁ is about 0.2 to 0.8 t / H, the predetermined capacity V ₀ is 2 to 160 t. By setting within this range, the two-type mixed lactic acid bacteria contained in the two-type mixed lactic acid bacteria water 16 grow efficiently in the lactic acid bacteria adjustment tank 3, and the filth is actively decomposed. Then, the lactic acid bacteria wastewater mixed liquid 18 in the lactic acid bacteria adjustment tank 3 is sent to the aeration equipment 17.

The aeration equipment 17 includes a first aeration tank 4, a first precipitation tank 5, a second aeration tank 6, a second precipitation tank 7, and a water storage tank 8. Further, from the first sedimentation layer 5 and the second sedimentation tank 7 to the lactic acid bacteria adjustment tank 3, the sewage return pump P ₃ that returns a part of the lactic acid bacteria wastewater mixture 18 and the water storage tank 8 to the first precipitation tank 5 or the lactic acid bacteria adjustment tank. 3 is provided with a sewage return pump P ₄ for returning a part of the lactic acid bacteria sewage mixed solution 18 to 3.

The lactic acid bacteria sewage mixed liquid 18 is allowed to flow from the first aeration tank 4 to the first precipitation tank 5, the second aeration tank 6, the second precipitation tank 7, and in the order of arrows 19. This aeration equipment 17 is allowed to stay for 20 to 40 days and aerated, and the lactic acid bacteria sewage mixed liquid 18 is deodorized (deodorized) and purified (purified water) with two kinds of mixed lactic acid bacteria, and BOD (biochemical oxygen demand) is The treated water 22 is 50 ppm to 200 ppm. In the treated water 22, about 10 ⁵ to 10 ⁶ of the two-type mixed lactic acid bacteria remain per ml. Then, the treated water 22 is caused to flow into the reservoir 8 that temporarily stores water. In addition, it is more preferable that BOD of the treated water 22 is 50 to 100 ppm.

  The pH (pH) of the lactic acid bacteria sewage mixed liquid 18 to be processed in the aeration equipment 17 is set to 6.2 to 6.4 throughout the entire process in the aeration equipment 17. Setting this value activates the degradation of filth by bacteria. Moreover, the deodorizing (deodorizing) and purified water (purification) effect of the livestock waste water 15 by the two-type mixed lactic acid bacteria water 16 (two-type mixed lactic acid bacteria contained in) is increased. Both chemical oxygen demand (COD), biochemical oxygen demand (BOD) and E. coli are significantly reduced.

  Then, the treated water 22 having a BOD of 50 ppm to 200 ppm is caused to flow into a transpiration water tank 31 in which wood chips 30 such as wood chips and large sawdust are stored. The treated water 22 flowing into the transpiration water tank 31 evaporates into the atmosphere and diverges. That is, a transpiration process is performed in which the treated water 22 is evaporated to the atmosphere to diverge.

FIG. 2 shows a cross-sectional side view of an essential part of an example of the implementation of the transpiration tank 31. FIG. 3 is a cross-sectional view taken along the line AA in FIG.
The transpiration water tank 31 stores wood chips 30 having different sizes ranging from fine powdery fine sawdust of 1 mm or less to wood pieces of 100 mm or less. In particular, it is desirable to collect the wood chips 30 having different sizes between 25 and 50 mm. The innumerable wood chips 30 stored in the transpiration tank 31 are not deposited in a compressed state, form a space part with each other, and appropriately contain air.

Further, the transpiration water tank 31 includes an introduction pipe 32 for introducing the treated water 22 to the bottom inside the transpiration water tank 31, and the introduction pipe 32 is connected to a discharge pipe 33 branched in a comb shape near the bottom of the transpiration water tank 31. is doing. The discharge pipe 33 is a perforated pipe, and is disposed so that the treated water 22 can be ejected to the bottom of the wood chip 30 stored in the transpiration water tank 31. Furthermore, a circulation pump P ₅ is provided at the bottom of the transpiration water tank 31. The circulation pump P ₅ connects the treated water 22 accumulated at the bottom to a water intake pipe 34 protruding upward from the transpiration water tank 31. The intake pipe 34 is branched above the transpiration water tank 31 (above the wood chip 30), and is connected to a spray pipe 35 having an instrument or hole capable of spraying / injecting treated water 22 on the upper surface of the wood chip 30 stored in the transpiration water tank 31. Connected.

When performing the transpiration process in which the treated water 22 evaporates and diverges into the atmosphere in the transpiration tank 31 (in the transpiration process), the treated water 22 having a BOD of 50 ppm to 200 ppm is passed through the introduction pipe 32. Let it flow into 31. The treated water 22 is discharged (spouted) from the discharge pipe 33 and stored in the transpiration water tank 31 (the bottom thereof). A portion of the stored treated water 22 is pumped up above the transpiration tank 31 by the circulation pump P ₅ through the water pipe 34. The treated water 22 pumped up is sprayed on the upper surface of the wood chip 30. That is, the treated water 22 is circulated in the transpiration water tank 31. In other words, the treated water 22 is infiltrated into the wood chip 30 from above and below.

  The treated water 22 stored in the transpiration tank 31 is sequentially sucked up by the wood chips 30 from the bottom upward by capillarity, and is easily evaporated. By infiltrating the treated water 22 into the wood chip 30, the contact area with the air and air is increased, and the environment is more easily evaporated. Further, the treated water 22 is deodorized and purified by the two-type mixed lactic acid bacteria contained in the treated water 22. In addition, the facultative anaerobic two-type mixed lactic acid bacteria ferment in the transpiration water tank 31, and the heat of fermentation assists in the evaporation (vaporization) of the treated water 22 (promotes evaporation). Further, the wood chips 30 are prevented from becoming clogged by the decomposition action of the two-type mixed lactic acid bacteria. The treated water 22 stored in the transpiration tank 31 is preferably about 1/4 of the accumulated height of the wood chips 30. It is desirable to set the temperature in the transpiration tank 31 to 20 ° C to 45 ° C.

  That is, the treated water 22 flows into the transpiration water tank 31 where the wood chips 30 are stored and circulates in the transpiration water tank 31, and the treated water 22 is mixed with the two-type mixed lactic acid bacteria contained in the treated water 22. Furthermore, transpiration treatment is performed to evaporate and diverge into the atmosphere while deodorizing and purifying. The treated water 22 (steam) that has been transpired is nearly odorless and does not give off any disgusting odors or the like even if it is dispersed in the atmosphere. Moreover, since it is not discharged and processed (disposal) as if it spills into a river etc., it does not make the surrounding residents feel disgusted.

For example, when the transpiration tank 31 has a length of 10 m, a width of 2 m, and a height of 4 m, and the wood chips 30 are accumulated in a full tank, it is desirable that the storage height of the treated water 22 be within 1 m. Further, it is desirable to set the height at which the treated water 22 is sprayed from the upper surface of the wood chip 30 within 0.5 m. It is desirable to provide three circulation pumps P _{5 that} can draw 1.1 liters per second. When the transpiration water tank 31 is provided in this way, 10 tons of treated water 22 can be transpiration per day.

Next, FIG. 4 shows a cross-sectional side view of another example of the transpiration water tank 31.
Another example of the transpiration water tank 31 is provided with two net-like partition shelves 36 and 36 that divide the wood chips 30 stored therein in the vertical direction. The wood chip 30 is divided into three layers in the vertical direction.
The net-like partition shelf 36 prevents compression of the wood chip 30 including the treated water 22 due to its own weight, forms an appropriate space in the wood chip 30 and includes air.
Then, the treated water 22 (vapor) evaporated from the lower layer (lowermost layer) wood chips 30 is evaporated after being absorbed (permeated) into the upper layer (intermediate layer) wood chips 30, and further the upper layer (uppermost layer) ) Let it be sucked (penetrated) into the wood chips 30 to evaporate and diverge into the atmosphere.

In addition, the design of the sewage treatment method of the livestock farm according to the present invention can be changed, and a decolorization tank may be provided while the treatment water 22 is decolored while flowing into the transpiration water tank 31 from the aeration equipment 17. Further, the water storage layer 8 may not be provided in the aeration equipment 17, and the treated water 22 may be sent from the second sedimentation layer 7 to the transpiration tank 31. Further, the circulation pump P ₅ of the transpiration water tank 31 may be provided outside the transpiration water tank 31.

  Further, as a design change of another example of the transpiration tank 31, in addition to the design shown in FIG. 4, three or more partition shelves 36 may be provided, and the wood chip 30 may be divided into four or more layers. One partition shelf 36 may be provided and divided into two layers. The partition shelf 36 is not limited to the net shape, and may be a plate member having a large number of through holes.

  As described above, the present invention deodorizes and purifies the livestock sewage 15 discharged from the livestock farm with the two-type mixed lactic acid bacteria in which Lactobacillus fermentum and Enterococcus faecium are mixed, and the BOD is 50 ppm to 200 ppm. The treated water 22 is made to flow into a transpiration tank 31 where wood chips 30 such as wood chips and large sawdust are stored, and the transpiration treatment is performed to evaporate the treated water 22 by evaporating it into the atmosphere. The treated water 22 can be deodorized and purified without using chemicals. It can be evaporated to the atmosphere and emitted. That is, livestock wastewater 15 can be treated without being discharged to the surroundings. It can be processed without adversely affecting the surrounding environment. A large amount of treated water 22 can be transpired. Moreover, since it is discharged and processed (disposal) as if it spills into a river etc., it can prevent surrounding residents from feeling disgusted.

  Also, lactic acid bacteria sewage mixed solution 18 obtained by mixing livestock sewage 15 discharged from a livestock farm and two mixed lactic acid bacteria water 16 obtained by diluting two mixed lactic acid bacteria mixed with Lactobacillus fermentum and Enterococcus faecium 18 Is aerated by aeration equipment 17 and deodorized and purified by lactic acid bacteria of two types to make treated water 22 having a BOD of 50 ppm to 200 ppm. The treated water 22 is transpiration in which wood chips 30 such as wood chips and large sawdust are stored. The treated water 22 is evaporated to the atmosphere while flowing into the water tank 31 and circulating in the transpiration water tank 31, while further deodorizing and purifying the treated water 22 with the two-type mixed lactic acid bacteria contained in the treated water 22. Therefore, the treated water 22 can be deodorized and purified by lactic acid bacteria without using chemicals containing chemical substances. It can be evaporated to the atmosphere and emitted. That is, livestock wastewater 15 can be treated without being discharged to the surroundings. It can be processed without adversely affecting the surrounding environment. A large amount of treated water 22 can be transpired. Moreover, since it is discharged and processed (disposal) as if it spills into a river etc., it can prevent surrounding residents from feeling disgusted.

It is explanatory drawing which shows embodiment of this invention. It is a cross-sectional side view which shows an example of implementation of a transpiration water tank. It is AA sectional drawing of FIG. It is a cross-sectional side view which shows an example of other implementation of a transpiration water tank.

Explanation of symbols

15 Livestock wastewater
16 Two kinds of mixed lactic acid bacteria water
17 Aeration equipment
18 Lactic acid bacteria wastewater mixture
22 Treated water
30 Wood chips
31 Steaming tank

Claims (2)

  Livestock sewage discharged from livestock farms (15) is deodorized and purified by a mixed lactic acid bacterium mixed with Lactobacillus fermentum and Enterococcus faecium, and treated water with a BOD of 50 ppm to 200 ppm (22) Then, the treated water (22) is caused to flow into a transpiration water tank (31) in which wood chips (30) such as wood chips and large sawdust are stored, and the treated water (22) is evaporated to the atmosphere to diverge. A sewage treatment method for livestock farms characterized by the above. Livestock wastewater discharged from livestock farms (15) and mixed lactic acid bacteria wastewater mixed with two mixed lactic acid bacteria water (16) diluted with two mixed lactic acid bacteria mixed with Lactobacillus fermentum and Enterococcus faecium The liquid (18) is aerated in an aeration facility (17), deodorized and purified by the above-mentioned two mixed lactic acid bacteria, and treated water (22) having a BOD of 50 ppm to 200 ppm,
The treated water (22) is caused to flow into a transpiration water tank (31) in which wood chips (30) such as wood chips and large sawdust are stored, and is circulated in the transpiration water tank (31). A transpiration process for evaporating and evaporating the treated water (22) to the atmosphere while further deodorizing and purifying the treated water (22) with the two mixed lactic acid bacteria contained in Sewage treatment method for livestock farms.

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