JP2004122029A - Aeration treatment system for excretion water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient water treatment system which treats excretion water being a liquid, which is obtained from the excretion of stockbrceding animals or the like by a solid-liquid separation treatment, by the metabolic action of aerobic microorganisms, does not require a wide site and large-scaled civil engineering construction and obtains transparent water having no color and bubbles and almost free from turbidity. <P>SOLUTION: This excretion water treatment system constituted by connecting a plurality of tanks by piping and arranging an oxygen and/or ozone supply means and rotary blades in the piping, is characterized fundamentally by stirring excretion water obtained by the solid-liquid separation treatment of excretion with the rotary blades in a process for feeding excretion water through the piping under a pressure to enhance the aeration treatment effect. By arranging the rotary blades reverse in elevation in the stirring due to the rotary blades, a stirring direction is reversed to further enhance the aeration treatment effect. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an aeration treatment system for treating human wastewater as a liquid which is separated into solid and liquid from manure of livestock animals and the like by the metabolic action of aerobic microorganisms.
[0002]
[Prior art]
Conventionally, livestock sewage (hereinafter, referred to as raw water) such as manure discharged from a livestock house is stored in a raw water tank, and then supplied to a manure solid-liquid separation device by a pump to be converted into solids and liquids such as feces. The method of separating and treating each is adopted. These conventional vibrating sieve type and inclined screen type solid-liquid separation systems are configured such that an inclined mesh screen is arranged at an inclined opening of a hopper-shaped wastewater receiver, and manure is supplied to the upper part of the inclined screen by a pump. Then, by dropping along the mesh screen, the liquid component falls from the mesh of the screen and is temporarily stored in a filtrate tank from a hopper-like wastewater receiver, and then sent to the next processing step such as an aeration tank. On the other hand, the solids flow along the screen, fall from the lower end of the screen to the solids storage pitch, and are deposited.
[0003]
By the way, conventionally, activated sludge treatment that treats this kind of manure requires a large-scale facility, which not only costs enormous costs, but also generates a large amount of strongly odorous sludge. A cumbersome process and enormous cost are required, and there is a problem that the burden is heavy for a small-scale livestock farming farmer and is not particularly suitable. Under such circumstances, a "method and apparatus for treating human waste of pigs and other livestock" of Patent Document 1 (Japanese Patent Laid-Open No. 11-33588) as shown in FIG. 5 has been proposed. The present invention provides "(1) a solid-liquid separation treatment for human waste of pigs and other livestock to remove solid substances contained in the human waste, and (2) a photosynthetic bacterium is added to the liquid separated by the solid-liquid separation. The primary aeration treatment is performed in the presence to decompose the organic matter in the human waste, and then (3) the liquid subjected to the primary aeration treatment is further subjected to the secondary aeration treatment in the presence of the radioactive bacterium to produce the waste in the human waste. The remaining organic matter is decomposed, and (4) the phosphoric acid and nitrogen components in the liquid generated by the secondary aeration treatment are removed using porous calcium silicate as a filter material, and (5) resuscitation-type microorganisms are removed. Removing the impurities from the aqueous liquid separated by the filtration using the ceramic and magnetite in which the enzyme to be produced is fixed to shirasu as a filter medium, and converting the aqueous liquid into fresh water, the method comprising the steps of: Process. " A. In the form of the aeration process, a submersible pump 9, an intake pipe 10, and a diffuser 11 are configured in an aeration tank, and when the submersible pump 9 is started, the suction force (decompression) generated by the discharge water flow. Air supplied from an intake pipe 12 above the liquid surface is sucked through an intake pipe 10, and a gas-liquid mixed flow 15 formed by the air is ejected into water with superfine bubbles 16. In this primary aeration tank 8, primary aeration treatment is performed in the presence of photosynthetic bacteria (red soil bacteria) to decompose organic substances contained in the liquid, thereby reducing the odor caused by human waste. In the subsequent filtration step, phosphoric acid and nitrogen are easily removed. However, even in this system, as shown in FIG. 5, in the treatment of the human waste water separated into solid and liquid, the container 22 containing the primary aeration tank 8, the secondary aeration tank 18, and the first filtration tank 23, A container 26 accommodating the second filtration tank 27, and a storage tank 31 and a coagulation sedimentation tank 32 formed of the same tank are required. Although these tanks are smaller in size than conventional activated sludge treatment facilities, they require a certain amount of land and require large-scale civil works such as digging large holes and constructing tanks by concrete casting. Therefore, the burden on livestock farmers is still considerable.
[0004]
[Patent Document 1]
JP-A-11-33588 [0005]
[Problems to be solved by the invention]
An object of the present invention is an aeration treatment system for treating human wastewater as a liquid which is separated into solid and liquid from manure of livestock animals or the like by the metabolic action of aerobic microorganisms, and does not require a large site or large-scale civil engineering work. It is an object of the present invention to provide a high-efficiency human wastewater treatment system that can obtain transparent water with little odor, color, and bubble, and almost no turbidity with a small-scale facility.
[0006]
[Means for Solving the Problems]
In the human wastewater treatment system of the present invention, a plurality of tanks are connected by a pipe, and a means for supplying oxygen and / or ozone and a rotating blade are provided in the pipe, and the human wastewater separated into solids is provided in the pipe. The basic feature is that the agitator is agitated by the rotating blades in the process of being pumped to enhance the aeration treatment effect. The stirring by the rotating blades is arranged in a series of rotating blades having the opposite angles of attack of the blades, thereby reversing the stirring direction to further enhance the aeration treatment effect. Further, the piping connecting the plurality of tanks has a meandering structure, so that the aeration process can be performed for a long time even in a compact structure in which the arrangement of the tanks is close, and the effect of the aeration process is further enhanced.
Then, the human wastewater treatment system of the present invention can achieve a high-efficiency aeration treatment effect with the above-described configuration, and thus can be configured with a small-capacity tank and a pipe connecting the tank, and a plurality of tanks are provided. This can be achieved with a metal tank installed on the ground that does not require civil engineering. Moreover, a compact structure that does not require a large area can be achieved.
Further, the human wastewater treatment system of the present invention takes a form in which the human wastewater treatment liquid passed through a plurality of tanks is returned to the original tank and circulated so that continuous processing is possible, and the final tank is returned to the original tank. Means are provided for discharging a part of the transfer liquid in the returned pipe as a processed liquid. And, in addition to being able to achieve the high-efficiency aeration treatment effect, the treated liquid is drained through the decolorization treatment process, so that there is no odor, no color, no bubbles, and almost no turbidity. And it can be discharged to the general sewer as it is.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
A conventional method of exposing air in an aeration tank, that is, contact between human wastewater and air, is generally a method in which an air injection port is arranged at the bottom of the tank to eject compressed air. In this form, air bubbles dissolve into the wastewater that comes into contact with air in the process of rising from the bottom and into the wastewater, and increase the activity of aerobic bacteria. Since it is in a free-flowing state, it is difficult to make all the wastewater and air uniformly contact, and it is also difficult to maintain the contact state. In the aeration processing mode described in Patent Document 1, as described above, the submersible pump 9, the suction pipe 10, and the diffuser 11 are configured in the aeration tank (see FIG. 5). When activated, the air supplied from the intake cylinder 12 on the liquid surface is sucked through the intake pipe 10 by the suction force (decompression) caused by the discharge water flow, and the gas-liquid mixed flow 15 formed by this air is superfine. The gas-liquid mixed flow is accompanied by ultra-fine bubbles in the diffuser 11, but also contacts the human wastewater into a wide tank. In addition, since it is in a free flowing state, it is difficult to make uniform contact with all human wastewater, and it is also difficult to maintain the contact state. Therefore, in the present invention, a form in which gas-liquid is mixed not in a free-flowing tank but in a pipe, which is subject to flow restriction, and the liquid mixed with the gas is transferred to the next tank without returning to the original tank. That is what I imagined. By doing so, the contact between the wastewater and the gas is made dense, and only the aerated wastewater is sent to the next tank. As the gas to be contacted, air may be used, but if high-purity oxygen, which is preferred by bacteria, is used, efficiency can be further improved. In addition, a rotating blade with a blade is arranged in the tube for gas-liquid mixing, and when the waste water is pumped by a pump, the rotating blade is rotated to generate a vortex and to be stirred with injected oxygen. Configured. A plurality of the rotor blades are arranged in series in the pipe, and the blades having the opposite direction of the blade are provided every other one. By adopting this configuration, the vortex of the human wastewater in the pipe is reversed every time it passes through the rotary wing, and the gas-liquid mixing is further promoted.
[0008]
In the present invention, a configuration is adopted in which a plurality of tanks are connected by piping. However, since the aeration treatment is performed not in the tank as in the conventional case but in the pipe, the two tanks are connected. The longer the length of the piping, the longer the aeration process. However, if the distance between the two tanks is increased, the scale of the system itself becomes large. Therefore, in the present invention, the two tanks are connected by meandering the tubes.
The human wastewater treatment system of the present invention is characterized in that gas-liquid is mixed in an area of a pipe subject to flow restriction, oxygen is used as a gas to be brought into contact, and a rotary blade having a blade in the pipe for gas-liquid mixing. In a series of multiple pipes in a pipe, and every other pipe with the opposite direction of the blades was installed. It is now possible to construct a system with the same processing capacity by using a tank with much smaller capacity than the aeration tank equipment and the piping connecting it. Since the system can be realized with a compact structure, the plurality of tanks can be realized by metal tanks installed on the ground which do not require civil engineering work, and do not require a large site.
[0009]
Embodiment 1
An embodiment of the present invention will be described with reference to FIG. The upper part of the figure is a plan view of the embodiment of the pipe type aeration system, and the lower part is a side view of a pipe portion from the first tank to the second tank. This embodiment, as seen from the figure a 4 tank first tank T ₁ and the third tank T ₃ and the second tank T ₂ and the adjacent tank fourth tank T ₄ were each partitioned by the partition plate S, the first and it has a structure connected by the tank T ₁ sequentially piping fourth tank T _4. A submersible pump P is provided in each tank, and pumps the wastewater in the tank through the connected pipes L ₁ , L ₂ , L ₃ , and L ₄ to the next tank. In this embodiment, a 5.5 kW pump P is used, a 100 mmφ stainless steel pipe is used for the pipes L ₁ , L ₂ , L ₃ , and L ₄ , and each tank is made of stainless steel.
[0010]
Raw sewage water which is solid-liquid separation in the first tank T ₁ is supplied, the activated sludge is mixed. As shown in the enlarged view of the lower right corner in FIG. 2, the intake mechanism has an intake pipe K provided in a pipe L ₁ (L ₃ ) immediately downstream of the pump P, and a negative pressure caused by the flow of the excreted waste water. Then, gas is sucked from the intake pipe and gas-liquid mixed in the pipe. The mixed gas may be air, but in this example, oxygen gas was supplied from a cylinder to increase the activity of bacteria. An oxygen generator may be connected instead of the cylinder. The pipes L ₁ , L ₂ , L ₃ , L ₄ meander and transfer so as to make two-and-a-half reciprocations with the next tank as shown in the lower part of FIG. In the meantime, as shown in FIG. 3, five rotors having opposite angles of attack were alternately arranged in series. As a result, each time the waste water passes through the rotary wing, it becomes a reverse vortex, which promotes gas-liquid mixing. To apply a ozone in addition to the pipe L ₄ in oxygen from the fourth tank in the final stage, performs bleaching of human waste water. As the decoloring means, it is possible to use charcoal other than ozone, or to use special soil or chemicals. The pipe L ₄ are also connected to the discharge pipe Lo through the valve 3 is connected to the first tank T ₁ through a valve 2. Ratio of the treated sewage water to discharge from the discharge pipe Lo and treated sewage water to return to the first tank T ₁ is determined by adjusting the opening of the valve 2. Generally 80% to 90% is returned to the first tank T ₁ is in, along with diluting the new raw sewage water supplied again aeration in the next cycle is added.
In this embodiment, each tank had a width of 1.2 m × 1.2 m and a height of 1.2 mm. Since the first tank T ₁ and the third tank T ₃ and the second tank T ₂ the distance between the fourth tank T ₄ was more than 6 m, sufficient if there is land of about 3m × 9m, can Ground is there.
[0011]
Embodiment 2
A different embodiment of the present invention will be described with reference to FIG. In this embodiment, the system of the first embodiment is basically one unit, and a plurality of units are connected in series, and are selectively used according to the required processing capacity. One unit is a standard for the processing of 200 pigs, and 2 units for 400 pigs and 3 units for 600 pigs. The number of units can be set according to the breeding scale of a livestock farmer, or it can be installed according to the maximum breeding scale, and when the breeding scale is reduced, it is possible to use only the necessary units from the later units. .
[0012]
【The invention's effect】
In the human wastewater treatment system of the present invention, a plurality of tanks are connected by pipes, and the pipes are provided with a means for supplying oxygen and / or ozone, and a rotary blade, and the wastewater separated from solids is flow-limited. In the process of being pressure-fed through the receiving pipe, the rotary blade is agitated by the rotating blades, so that gas-liquid mixing is efficiently performed, and the treated wastewater is mixed with untreated wastewater. Since it is transferred to the next tank without any trouble, a reliable and high aeration effect can be obtained.
In addition, in the present invention, the stirring direction is reversed by arranging the rotating blades having the opposite angle of attack of the blades in series in the stirring by the rotating blades, so that the gas-liquid mixing is performed efficiently, and a higher aeration effect is achieved. . The piping connecting the plurality of tanks has a meandering structure, so that the aeration process can be performed for a long time even with a compact structure in which the arrangement of the tanks is close, and the aeration treatment effect can be further enhanced.
Then, the human wastewater treatment system of the present invention can achieve a high-efficiency aeration treatment effect with the above-described configuration, and thus can be configured with a small-capacity tank and a pipe connecting the tank, and a plurality of tanks are provided. This can be achieved with a metal tank installed on the ground that does not require civil engineering. Moreover, it can be realized as a compact structure that does not require a large area.
Further, in the human wastewater treatment system of the present invention, the human wastewater treatment liquid passed through the plurality of tanks is returned to the original tank and circulated, and one of the pipe transfer liquids returned from the final tank to the original tank. By providing a means for discharging the part as a processed liquid, continuous processing can be performed instead of long-term batch processing such as several tens of days. And, in addition to being able to achieve the high-efficiency aeration treatment effect, the treated liquid is drained through a decolorization treatment step, eliminating odors, colors and bubbles, and clear water with almost no turbidity. And it can be discharged to the general sewer as it is.
[Brief description of the drawings]
FIG. 1 is a view showing one embodiment of the present invention, in which an upper part is a plan view and a lower part is a side view of a pipe portion from a first tank to a second tank.
FIG. 2 is a sectional view showing a tank structure according to one embodiment of the present invention.
FIG. 3 is a transparent perspective view showing a form in which a rotor is installed in a pipe in the embodiment.
FIG. 4 is an example for explaining a measure according to a scale in designing a pipe-type aeration system of the present invention.
FIG. 5 is a diagram illustrating a conventional aeration system.
[Explanation of symbols]
T ₁ , T ₂ , T ₃ , T ₄ First to fourth tanks _BR Right-handed rotary blades L ₁ , L ₂ , L ₃ , L ₄ piping B _L Left-handed rotary blades P Submersible pumps B ₁ , B ₂ , B ₃ valve

Claims (6)

A process in which a plurality of tanks are connected by a pipe via a pump, and a means for supplying oxygen and / or ozone and a rotating blade are provided in the pipe, and a process in which human waste water separated into solids is pumped through the pipe. The wastewater treatment system according to any one of claims 1 to 3, wherein the agitating effect is enhanced by the rotating blades to enhance an aeration treatment effect. 2. The human waste water treatment system according to claim 1, wherein the rotating blades having the opposite attack angles of the blades are alternately arranged in series, and the stirring direction is reversed to enhance the aeration treatment effect. The wastewater treatment system according to claim 1 or 2, wherein the piping connecting the plurality of tanks has a meandering structure so that the aeration process between the tanks is long even when the arrangement of the tanks is close. The human wastewater treatment system according to any one of claims 1 to 3, wherein the plurality of tanks are formed by metal tanks that can be installed on the ground. The manure treatment liquid passing through the plurality of tanks is returned to the original tank and takes a form to circulate, and the pipe is provided with means for discharging a part of the transfer liquid of the pipe returned from the final tank to the original tank as a treated liquid. The human wastewater treatment system according to any one of claims 1 to 4, wherein The wastewater treatment system according to any one of claims 1 to 5, wherein the treated liquid is drained through a decolorizing treatment step.

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