JP5425048B2 - Liquid fertilization treatment method of decanter juice using ultra deep aeration tank - Google Patents

Description

  The present invention belongs to the technical field of a liquid fertilization method for decanter juice using an ultra-deep aeration tank.

In some starch factories, during the operation period, the potato juice that is the juice (squeezed liquid) after grinding the raw potato and squeezing the starch with a decanter (horizontal continuous centrifuge) In order to secure the yield, it was sprayed on the farmland as it was and returned. When it could not be sprayed due to weather such as rainy weather, decanter juice was thrown into the waste liquid reservoir and stored.
However, the decanter juice stored in the wastewater storage pond cannot be processed completely due to the increase in starch production. The problem has become prominent.

By the way, Patent Document 1 discloses a reaction tank that introduces decanter effluent and performs acid treatment to suppress foaming, and an SS separation tank that separates and removes SS from raw water of high-concentration BOD and COD that has been acid-treated in the reaction tank. And an acid-treated water tank for storing acid-treated treated water for stable supply of water quantity and water quality of the separated liquid drained by solid-liquid separation in the SS separation tank, and for treatment at high concentration organic matter treatment and low water temperature Decanter concentrated juice drainage treatment equipment (refer to claim 1) of a starch factory using potatoes and the like consisting of an aeration tank and a precipitation tank filled with a plurality of stages of pellets, and a starch factory using potatoes and the like as raw materials Neutralization of decanter concentrated juice drainage by aeration or agitation without neutralizing substances added as neutralization treatment for precipitated sludge in treated wastewater acidified with or without acidic substances added Starch decanter concentrated juice waste water treatment method for plant as a raw material (see claim 2) is disclosed (see paragraph number [0013] in combination with this).
According to this method, the removal effect of BOD, COD, and SS is high, and the effectiveness of wastewater treatment is recognized.

Japanese Patent No. 3066577

Although the invention according to the above-mentioned Patent Document 1 has a temporary effect on wastewater treatment, the entire apparatus has a complicated configuration such as performing in a multistage aeration tank of 2 to 4 stages, and there are many treatment processes. (See paragraph number [0023] second sentence, FIG. 1). Therefore, there is a problem that the cost is very high. Further, since the configuration of the entire apparatus is complicated, the maintenance cost is increased accordingly.
Furthermore, the method of suppressing the foaming phenomenon caused by the protein contained in a large amount in the decanter juice is also acidified by addition of an acidic substance by isoelectric point precipitation reaction or standing of the decanter juice to PH 3.7 to 6.9. After setting, it was necessary to precipitate and separate SS and the like in the SS separation tank (see paragraph No. [0023], first sentence), which was very troublesome and complicated.

The object of the present invention is to spread decanter juice stored in a storage pond on a farmland with a very simple configuration by dramatically increasing the processing speed such as BOD by using an ultra-deep aeration tank. It is providing the liquid fertilization processing method of a decanter juice which can be reduced.
The next object of the present invention is to provide an economical and rational decanter juice liquid fertilization treatment method that uses the decanter juice during aeration treatment for water spraying and can suppress the foaming phenomenon in parallel with the aerobic decomposition treatment step. It is to be.

As a means for solving the above-mentioned background art, a method for liquid fertilization of decanter juice using an ultra-deep aeration tank according to the invention described in claim 1 has a downflow pipe section and an upflow pipe section. Then , the potato as a raw material is ground and decanted in an ultra-deep aeration tank composed of a shaft 40m to 150m high buried in the ground and a head tank connected to the upper end of the shaft. Adding a decanter juice that is a juice after squeezing starch ; and
A process of aerobically decomposing decanter juice with microorganisms propagated in the ultra-deep aeration tank by supplying compressed air from a compressor into the ultra-deep aeration tank through an aeration tube and aeration treatment;
And a step of introducing the aerobically decomposed decanter juice to a treatment liquid reservoir.

  The invention described in claim 2 is the liquid fertilizer treatment method for decanter juice using the ultra-deep aeration tank according to claim 1, wherein the decanter juice in the shaft is pumped up and sprinkled in an umbrella shape in the head tank. The defoaming apparatus including the watering means is provided above the head tank.

  The invention described in claim 3 is the liquid fertilization treatment method of decanter juice using the ultra-deep aeration tank described in claim 1 or 2, wherein the decanter juice is stored in a starch waste liquid reservoir for a certain period of time, It puts in the said ultra-deep layer aeration tank, It is characterized by the above-mentioned.

  Invention of Claim 4 is the liquid fertilization processing method of the decanter sap using the super deep aeration tank as described in any one of Claims 1-3, The temperature of the said decanter sap is low, A super deep explosion tank When the inside temperature is 15 ° C. or lower, the decanter soup is heated to 20 ° C. or higher before being put into the ultra-deep aeration tank.

  The invention described in claim 5 is the decanter juice liquid fertilization treatment method using the ultra-deep aeration tank according to any one of claims 1 to 4, wherein the decanter juice stored in the treatment liquid reservoir is It is characterized by being pumped up and supplied into the tank of a tank truck.

  The invention described in claim 6 is the liquid fertilization treatment method of decanter juice using the ultra deep aeration tank according to any one of claims 2 to 5, wherein the watering means is a surface of the decanter juice in the head tank. To 30 cm in height.

According to the liquid fertilization treatment method for decanter juice using the ultra-deep aeration tank according to the present invention, the decanter soup can be satisfactorily processed in the ultra-deep aeration tank.
1) Oxygen supply capability with high water pressure is high, and processing is promoted. Therefore, it is economical and reasonable.
2) Can be implemented in a relatively small facility.
3) Special skills and knowledge are not required for maintenance management.
4) Since it can be implemented with a very simple configuration, maintenance is easy.
5) It can be sprayed in July to August, which was not the spraying time.
6) When the defoaming apparatus according to Example 2 is used, in addition to the effects 1) to 5), an extremely good aerobic decomposition treatment can be continuously performed.

It is the schematic which showed the liquid fertilization process process of the decanter soup using an ultra-deep aeration tank. It is the elevation which expanded and showed the ultra-deep layer aeration tank of FIG. It is the elevation which expanded and showed the different Example of the ultra-deep layer aeration tank of FIG. It is the top view which showed roughly the watering means (foaming apparatus). A is a front view showing watering means, B is a view taken along the line B-B of A, and C is a bottom view of A. FIG.

  Next, an example of a liquid fertilizer treatment method for decanter juice using the ultra-deep aeration tank according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a method for liquid fertilization of decanter juice using an ultra-deep aeration tank according to the present invention.
This decanter soup liquid fertilization method is a super deep aeration comprising a shaft 1 having a downflow pipe portion 1a and an upflow pipe portion 1b, and a head tank 2 connected to the upper end of the shaft 1. In the tank 10, the step of adding decanter soup 11, which is a soup after grinding the potato as a raw material and squeezing starch with a decanter,
A process of aerobically decomposing the decanter juice 11 with microorganisms propagated in the ultra-deep aeration tank 10 by supplying compressed air from the compressor 5 through the aeration pipe 6 into the ultra-deep aeration tank 10 and performing aeration process. When,
And a step of guiding the decanter soup 11 subjected to the aerobic decomposition treatment to the treatment liquid reservoir 4.

The super deep aeration tank 10 divides the downflow pipe portion 1a used for the downward flow of the decanter soup 11 and the upward flow pipe portion 1b used for the upward flow as shown in an enlarged view in FIG. As shown in FIG. 3, the shaft 1 having a depth (H) of 40 m to 150 m, which is formed as a double tube structure, and the upper end of the shaft 1 are expanded and connected as shown in FIG. And a head tank 2. The shaft 1 is embedded in the ground.
The liquid in the shaft 1 descends the downflow pipe portion 1a, reverses at the bottom, rises up the upflow pipe portion 1b, and forms a circulating flow that returns to the downflow pipe portion 1a via the head tank 2. doing.
Since the flow rate of the mixed liquid in the downflow pipe portion 1a is about 1 to 2 m / second and is sufficiently larger than the speed at which the bubbles float in still water (about 0.3 m / second), the bubbles are in the downflow pipe portion 1a. Will not rise within.
In the ultra-deep aeration tank 10, a large hydrostatic pressure is generated according to the depth, and oxygen in the blown air quickly dissolves in the liquid. Incidentally, in this embodiment, the shaft 1 having a depth (H) of 45 m is used. The flow that descends and rises in the ultra-deep aeration tank 10 is a highly turbulent flow, and bubbles are finely divided to increase the oxygen dissolution rate. Further, since the bubbles reciprocate deeply, the residence time of the bubbles is long, and high oxygen transfer efficiency and high aeration performance can be obtained.
The temperature in the super deep aeration tank 10 is set to 15 ° C. or higher. This takes into account the decomposition treatment (activity) of the microorganisms propagated in the aeration tank 10. The optimum temperature for aerobic decomposition is about 30 ° C. Therefore, when the temperature of the decanter soup 11 to be added is low and the water temperature in the super-deep explosion tank 10 is 15 ° C. or lower, it is preferable to carry out the decanter soup 11 by heating it to 20 ° C. or higher in advance.

The decanter soup 11 is introduced into the downflow pipe portion 1a of the ultra deep aeration tank 10 having the above-described configuration, and compressed air from the compressor 5 is supplied through the air diffusion pipe 6 to perform an aeration process. Therefore, the decanter soup 11 introduced into the downflow pipe section 1a is moved through the downflow pipe section 1a and the upflow pipe section 1b in the aeration tank 10 by the compressed air supplied by the aeration process (clockwise in FIG. 2). To circulate).
By the way, in this embodiment, the decanter soup 11 to be introduced in one day is about 30 m ³ and the capacity of the ultra deep aeration tank 10 is about 110 m ³ . Therefore, on average, the decanter soup 11 poured at a time stays in the ultra-deep aeration tank 10 for about 4 days.

The super deep aeration tank 10 has a high oxygen supply capacity because oxygen in the aeration air dissolves in water in proportion to the high water pressure in the deep part, so that a large amount of aerobic microorganisms are retained, and organic matter per volume of the aeration tank 10 Since the decomposition rate is remarkably increased, the odor improvement of the decanter juice 11 that has been charged is promoted.
Thus, the decanter soup 11 introduced into the ultra-deep aeration tank 10 circulates continuously for about 4 days, and is aerobically decomposed by the microorganisms circulating and flowing together in the aeration tank 10.

The decanter juice 11 that has been sufficiently aerobically decomposed is discharged from the ultra-deep aeration tank 10 by overflow (or pump) as needed, and is temporarily stored in the treatment liquid reservoir 4. The stored decanter soup 11 is pumped out of the treatment liquid storage tank 4 by a pump or the like when necessary, supplied into the tank of the tank truck 9 and sprayed on the farmland as liquid manure.
By the way, according to the experiment of the present applicant, the BOD (biochemical oxygen demand) of the decanter soup 11 is about 10,000-15,000 mg / L before being introduced into the ultra-deep aeration tank 10. It has been found that the soluble BOD after being discharged from the ultra-deep aeration tank 10 is improved to an almost odorless state of about 20 to 80 mg / L.
Hereinafter, the processing plan of the decanter juice in the starch factory will be described over time based on FIG.

(Explanation about waste liquid reservoir 3)
The operation period of the starch factory is from September to November (or December) for 3 months (or 4 months). During this time, the decanter juice 11 that could not be sprayed on the farmland due to rain or the like is intermittently connected to the waste liquid reservoir 3 Inflow. The average amount of decanter soup 11 flowing in is about 6000 m ³ / year. BOD is about 10,000-15,000 mg / L. Incidentally, the pond volume of the waste liquid reservoir 3 according to the present embodiment is about 30,000 m ³ . In the waste liquid reservoir 3, aeration such as mixing with air is not performed.

(Description of the super deep aeration tank 10)
The untreated decanter juice 11 that flowed into the waste liquid reservoir 3 during the period from September to November is about 30 m ³ / day for 7 days from May to November of the following year ( 80 days (2400m ³ ) from May to July, 120 days (3600m ³ ) from August to November, total about 6000m ³ ) Downstream flow of ultra deep aeration tank 10 that is pumped up by pump 7 It is thrown into the pipe part 1a side.
That is, a total of about 6000 m ³ of decanter juice 11 flowing into the waste liquid reservoir 3 is introduced into the super deep aeration tank 10 between May and November of the following year and subjected to aerobic decomposition.
When the temperature of the decanter soup 11 is low in May or after November, if the water temperature in the ultra-deep explosion tank 10 drops to 15 ° C or lower, the decanter soup 11 is added to 20 ° C or higher in advance before charging. It is preferable to carry out the operation at a high temperature. This is based on the necessity of maintaining the temperature in the ultra-deep aeration tank 10 at 15 ° C. or higher in consideration of microbial decomposition.
The decanter juice 11 introduced into the ultra-deep aeration tank 10 is aerobically decomposed by microorganisms circulating and flowing together in the aeration tank 10. The soluble BOD of the decanter juice 11 after being aerobically decomposed is about 20 to 80 mg / L, which is almost odorless. Thereafter, the decanter soup 11 that has been sufficiently aerobically decomposed is discharged from the ultra-deep aeration tank 10 by an overflow (or pump) at any time by an input amount (about 30 m ³ / day), and the next treatment liquid reservoir 4 is temporarily stored.

(Description of treatment liquid reservoir 4)
In the present embodiment, the treatment liquid reservoir 4 for storing the decanter soup 11 discharged from the ultra-deep aeration tank 10 is implemented with a volume of about 3400 m ^3, and includes an aeration device that stirs with air. . The odorless decanter juice 11 stored in the treatment liquid reservoir 4 is pumped up by the pump 8 as needed, supplied into the tank of the tank truck 9 and sprayed on the farmland as liquid manure.
The amount of the decanter juice 11 pumped from the pump 8 matches the amount of the untreated decanter juice 11 to be put into the ultra deep aeration tank 10. That is, from May to July, about 30 m ³ / day of decanter soup 11 is sprayed on the farmland for a total of 80 days (times), and from August to November, about 30 m ³ / day of decanter soup 11 For a total of 120 days.

Thus, about 6000 m ³ of untreated decanter juice 11 stored in the waste liquid reservoir 3 from September to November is all in the deep aeration tank 10 from May to November of the following year. To be aerobically decomposed and sprayed on farmland between May and November. In addition, the inflow amount of the decanter soup 11 into the waste liquid reservoir 3 is not limited to a total of about 6000 m ³ / year on average, and may be appropriately increased or decreased according to the weather or the like every year.

Therefore, according to the liquid fertilization processing method of decanter juice using the ultra-deep aeration tank according to the present invention, the decanter soup can be satisfactorily processed in the ultra-deep aeration tank, and thus the following effects are achieved.
1) Oxygen supply capability with high water pressure is high, and processing is promoted. Therefore, it is economical and reasonable.
2) Can be implemented in a relatively small facility.
3) Special skills and knowledge are not required for maintenance management.
4) Since it can be implemented with a very simple configuration, maintenance is easy.
5) It can be sprayed in July to August, which was not the spraying time.

4 and 5 show an embodiment in which the defoaming device 20 is installed in the ultra-deep aeration tank 10 according to the first embodiment.
The decanter soup 11 has a very high BOD of 10,000 to 15,000 mg / L and contains a large amount of protein, which is a difficult-to-decompose product that is difficult to biologically process. A foaming phenomenon occurs in which the decanter soup 11 foams in a short time by stirring or the like. Therefore, it may be difficult to perform a favorable aerobic decomposition treatment in the ultra-deep aeration tank 10 due to foaming due to aeration of biological treatment. In such a case, it is preferable that the defoaming device 20 is installed in the ultra deep aeration tank 10 according to the first embodiment.

The defoaming device 20 includes a pump (not shown) for pumping up the decanter juice 11 during aerobic decomposition treatment in the shaft 1 of the ultra-deep aeration tank 10, a watering means 13 for watering in an umbrella shape, and the pump and watering means. 13 is mainly composed of a pipe 14 communicating with 13.
As shown in FIG. 4, the six watering means 13 are arranged in a well-balanced position directly above the head tank 2. Specifically, a frame member 22 in which a steel material (H-shaped steel) is rigidly bonded in a square shape is installed on the head tank 2, and a pipe 14 communicating with the water sprinkling means 13 is fixed to the frame member 22. Means 13 are installed.

  The water sprinkling means 13 includes a cylindrical pipe 15 (an octagonal shape in the illustrated example), a disk-like flange 16 that is horizontally fixed to the lower end of the pipe 15, the same shape as the flange 16, and the distance between the flange 16. It is comprised from the water receiving plate 17 which bolts so that adjustment is possible. 5, reference numeral 18 denotes a long bolt, reference numeral 19 denotes a wing nut, and reference numeral 21 denotes a rib for reinforcing the flange 16. The pipe 14, the conduit 15, the flange 16, and the water receiving plate 17 are all made of vinyl chloride, but the material is not limited to this.

The decanter juice 11 pumped up by the pump radiates 360 degrees from the gap between the flange 16 and the water receiving plate 17 through the pipe 14 and the conduit 15 and is sprayed in an umbrella shape.
By this watering action, bubbles floating on the surface of the decanter soup 11 in the ultra-deep aeration tank 10 are erased, so that a very good aerobic decomposition treatment can be performed.
Incidentally, in the comparison experiment by the present applicant, the method of spraying in a shower-like manner has almost no defoaming function and is liable to be clogged with foreign matters, resulting in problems in performance and maintenance. On the other hand, the method of watering in the shape of an umbrella according to the present embodiment continuously erases most of the floating bubbles and continuously performs a very good aerobic decomposition process without the possibility of clogging with foreign substances. I knew I would get it.

More specifically, the watering means 13 according to the present embodiment will be described. The distance between the flange 16 and the water receiving plate 17 can be adjusted by a bolt 18 and a nut 19, thereby adjusting the watering amount. According to the experiment by the present applicant, the distance between the flange 16 and the water receiving plate 17 is about 0.5 to 1.5 cm, and the surface of the decanter soup 11 in the ultra-deep aeration tank 10 and the outermost of the water spray means 13. It has been found that when the distance to the water receiving plate 17 located at the lower portion is set to about 30 cm, an excellent defoaming function is exhibited.
The number of watering means 13 (six in this embodiment), the distance between the flange 16 and the water receiving plate 17 (about 0.5 to 1.5 cm in this embodiment), the surface of the decanter soup 11 and the water receiving plate The distance from 17 (about 30 cm in this embodiment) is not limited to this, and the design can be appropriately changed according to the plane area of the head tank 2 or the required aerobic decomposition capacity.

  Therefore, according to the liquid fertilization treatment method of decanter juice using the ultra-deep aeration tank according to Example 2, in addition to the above-described effect (see paragraph [0025]), a very good aerobic decomposition treatment is continuously performed. Can be done.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated examples, and includes a range of design changes and application variations that are usually made by those skilled in the art without departing from the technical idea thereof. I will mention that just in case.

DESCRIPTION OF SYMBOLS 1 Shaft 1a Downflow pipe part 1b Upflow pipe part 2 Head tank 3 Waste liquid reservoir 4 Treatment liquid reservoir 5 Compressor 6 Aeration pipe 7 Pump 8 Pump 9 Tank lorry vehicle 10 Super deep aeration tank 11 Decanter liquid 12 Partition plate 13 Sprinkling means 14 Piping 15 Conduit 16 Flange 17 Water receiving plate 18 Long bolt 19 Wing nut 20 Defoaming device 21 Rib 22 Steel (H-shaped steel)

Claims (6)

In an ultra deep aeration tank having a downflow pipe section and an upflow pipe section and comprising a shaft 40m to 150m in height buried in the ground and a head tank connected to the upper end of the shaft In addition, a step of adding a decanter soup that is a soup after grinding the potato as a raw material and squeezing starch with a decanter,
A process of aerobically decomposing decanter juice with microorganisms propagated in the ultra-deep aeration tank by supplying compressed air from a compressor into the ultra-deep aeration tank through an aeration tube and aeration treatment;
Leading the aerobically decomposed decanter juice to a treatment liquid reservoir;
A liquid fertilization treatment method for decanter juice using an ultra-deep aeration tank.  The ultra-foaming device including a watering means for pumping up the decanter juice in the shaft with a pump and spraying it in an umbrella shape in the head tank is provided above the head tank. Liquid fertilization method of decanter juice using a deep aeration tank.  The decanter juice is stored in a starch waste liquid reservoir for a certain period of time and then introduced into the ultra deep aeration tank. The decanter juice using the ultra deep aeration tank according to claim 1 or 2, Liquid fertilization treatment method.  When the temperature of the decanter juice is low and the temperature in the ultra-deep explosion tank is 15 ° C. or less, the decanter juice is heated to 20 ° C. or more before being put into the ultra-deep aeration tank, A liquid fertilization treatment method for decanter juice using the ultra-deep aeration tank according to any one of claims 1 to 3.  The ultra-deep aeration tank according to any one of claims 1 to 4, wherein the decanter juice stored in the treatment liquid reservoir is pumped up and supplied into a tank of a tank truck. Liquid fertilization treatment method for decanter juice.  6. The liquid fertilizer for decanter soup using the ultra-deep aeration tank according to claim 2, wherein the watering means is provided at a height of about 30 cm from the surface of the decanter soup in the head tank. Processing method.

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