JPH0710384B2 - Sewage treatment equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for treating sewage.

[Conventional technology and its technical problems]

As water is said to be natural blood, it is indispensable for not only general life but also for conducting various industrial activities such as mining and industry, but suspended substances (suspended substances) SS, sedimentary substances such as sludge and sludge, chlorine ions, Sulfate ion, ammonia,
Contamination with a wide variety of substances such as inorganic dissolved substances represented by hydrogen sulfide, nitrate ions, phosphate ions, organic dissolved substances such as fibers, sugars, proteins, etc., organic substances such as iron, manganese, cyanide compounds, phenols, etc. It is polluted, which has a great impact on the living environment and natural environment and hinders smooth industrial activities.

For example, in food manufacturing, the quality of wastewater is usually 2-9, BOD is 500-5,000ppm, SS50-400-4,000ppm
However, in the case of waste liquid such as potato shochu, the pH
About 3.6, SS 26,000ppm, COD 42,000ppm, BOD 110,000ppm
It is an extremely high concentration refractory substance. Therefore, should such a wastewater be discharged to a sewerage facility, the wastewater quality standard (BOD: 20 to 200 ppm) will be exceeded, which will kill the activated sludge and render it unusable for sewage treatment. Cause serious damage.

As a method for treating such wastewater, a method of combining a sprinkling filter and a biofilm has been considered effective, but because of the extremely poor water quality as described above, the filter bed immediately becomes clogged,
Due to excessive load, protozoa of biofilm are not stable, metabolism and exfoliation occur, and execution cannot be performed. Therefore, conventionally, biological treatment has been impossible, and a method of filling and sealing drums and dumping them at sea has been adopted. However, since this dumping at sea causes pollution problems, it is required to establish treatment technology as soon as possible. As a countermeasure, it is conceivable to adjust SS, pH, COD, etc. in the pre-treatment, but PH
Although it is a chemical that can be adjusted to some extent, SS particles are extremely fine particles that come very close to water molecules, so they cannot be removed by precipitation methods, filtration, etc., making it difficult to deal with. It was what I was doing.

In addition, the water quality of natural and artificial rivers, lakes, canals, harbors, etc. has been deteriorating due to the inflow of sewage. A large amount of fine-grained organic matter (suspended material) called sludge, which has a relatively large specific gravity, is present in this water, and it contains a large amount of phosphorus, nitrogen, etc. , Generation of hydrogen sulfide, ammonia, nitrous acid, COD, B
DO value is extremely high. It was extremely difficult to easily and efficiently remove such sludge and the like.

Further, in recent years, along with the development of aquaculture and fishery, it has been vigorously carried out to transport seafood by a ship, a vehicle, etc., while keeping it alive, and to stock up in live fish cages in the consumption area. In this case, it is indispensable to circulate and purify the seawater in the storage tank, the shipping adjustment tank, and the tank equipped with the transportation means. There are problems that cause water pollution and reduce the survival rate.
This cause exceeds the purification capacity by accommodating a large amount of seafood, and organic nitrogen oxides (ammonia, carbon dioxide gas, nitrous acid, hydrogen sulfide, etc.) accumulate due to the decomposition of excrement, bait debris, etc. in seawater, depending on the load. This is because it becomes sewage seawater, and even in a biological purification device whose function has been calculated, it causes exfoliation and outflow of biofilm and bacterial metabolism.

In this case, a particularly troublesome substance is the harmful biodegradable substance, and the female eggs of fish can be easily removed by filters, but the proteins that cause the most pollution, such as male sperm and chair stains, are minute. Since it passes through the eye of the filter, it cannot be separated and removed easily.

Conventionally, as a treatment method for industrial wastewater (wastewater), domestic wastewater, and sewage, a physical treatment method, a chemical treatment method, a biological treatment method, etc. are used individually or in combination depending on the water quality and the treated substance, and suspended. Various types of means for separating and removing substances have also been developed. However, conventional devices are generally large and thus take up a large floor area, and the mechanism is complicated and there are many movable parts, but the processing capacity is low, the operation is complicated, and complicated maintenance such as backwashing is required. There was a problem with and it was not practical.

The present invention was devised in order to solve the above-mentioned problems, and an object of the present invention is to provide a fine suspension or sludge in wastewater with a small and simple structure and a simple operation. The toxic and biodegradable substances represented by and the volatile dissolved substances contained in them are separated and removed very efficiently and at the same time, the oxidative decomposition of organic compounds, inorganic substances such as iron, hydrogen sulfide, nitrite ions, and cyanide compounds. An object of the present invention is to provide a high-performance wastewater treatment device capable of separating isolated bacteria.

Furthermore, the present invention can effectively realize reduction and stabilization of the load by combining with a purification device using a biofilm of the next stage and using it as a pretreatment means of the purification device, and the purification capability of the purification device is at the highest level. It is to provide a sewage treatment / purification device that can be effectively used.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a closed cylindrical tank,
A first tubular body that goes down from the inner top of the closed tubular tank to the bottom of the tank so as to form an annular chamber with the inner surface of the closed tubular tank, and an annular flow that communicates with the lower portion of the annular chamber. A second tubular body that is inserted into the first tubular body so as to form a passage and has an upper end that stops at a limit that does not reach the inner top of the tank to form a closed space at the inner top of the annular chamber; The inlet port at the tip opens in a substantially tangential direction of the annular chamber 3, the upstream side of the inlet port rises to a level higher than the upper end of the second cylindrical body, and at the high level portion, the throttle and the downstream side in the vicinity thereof. It is created by stirring the raw water introduction system with an ozone mixing mechanism that connects the ozone supply system and disperses and mixes ozone into the raw water that is passing through, and the ozone-mixed raw water that is introduced into the annular chamber and that is introduced into the annular chamber. Seals the foamy waste that is collected by being entangled in fine bubbles Outside Jo tank is obtained by the configuration and a foam waste removal mechanism for discharging.

A circulation system that connects the upper and lower portions of the annular chamber is provided as needed, and a gas mixing mechanism is provided in the circulation system in order to improve the separation efficiency of the foamy waste. Preferably, the gas mixing mechanism is connected to an ozone supply system.

The treated water extraction system may be discharged as it is depending on the water quality, or may be connected to a biological purification device of a required number of stages, and the biological purification device is preferably provided near a closed tank. .

When the raw water quality is poor, the treated water extraction system is connected in series to one or more sub-treatment devices having the same or similar structure as the basic structure. This makes it possible to more reliably separate and remove the ultra-hard biodegradable substance and the volatile dissolved substances contained therein.

〔Example〕

1 to 5 show a basic embodiment of the present invention. Reference numeral 1 is a vertically long closed cylindrical tank erected on a base 1a, which is made of zinc-plated steel plate, stainless steel, synthetic resin having excellent corrosion resistance and chemical resistance, and the like, and has a top plate portion 1b and a bottom plate portion 1c.
The upper and lower ends are sealed by.

Reference numeral 2 denotes a first cylindrical body provided in the closed cylindrical tank 1, a base end portion of which is fixed to a top plate portion 1b and a tip end portion of which is a bottom plate portion 1c.
An annular chamber 3 having a relatively large volume is formed between the inner peripheral surface of the tank and the inner surface of the tank. The annular chamber 3 has an upward slope, preferably a spiral, for swirling and raising the mixed fluid of raw water and gas (ozone) discharged into the annular chamber 3 at a position of a required height level from the bottom plate portion 1c. A plate-shaped flow guide 17 is provided.
The flow guide 17 does not completely partition the upper and lower sides of the annular chamber 3, and it is necessary to provide a passage gap 17a on the inner diameter side or the outer diameter side.

And below the flow guide 17, if necessary,
Filler with coarse texture such as porous honeycomb plastic
31 is attached. When this filler 31 is used, it can have an appropriate resistance to the passage of raw water and can function as a filter bed.

Reference numeral 4 denotes a second tubular body which is arranged concentrically with the first tubular body 2 in the closed tubular tank 1, and a relatively narrow annular flow path 5 is provided between the first tubular body 2 and the second tubular body 4. Bottom plate 1c with an outer diameter that can be formed
Is water-tightly supported, the upper end 4a opens at a required distance from the top plate 1b, and the lower end forms or is connected to a treated water extraction system 10 extending from the closed cylindrical tank 1 to the outside. . Then, remove air from the top plate 1b above the upper end 4a.
18 are provided.

Reference numeral 6 denotes a raw water introduction system, which is composed of a rigid pipe line, and an introduction port 60 at the tip thereof opens in a substantially tangential direction of the annular chamber 3 near the flow guide 17. The raw water introduction system 16 is bent so as to rise on the upstream side of the introduction port 60, and the upper end 4a of the second tubular body 4 is bent.
A higher level section 61 is provided. The sewage introduction system 6 is connected to a flexible pipeline 6a having a pump 7 for pumping raw water, and a cartridge for collecting and accumulating a solid substance at an appropriate position in the middle of the flexible pipeline 6a. A filter 8 of the formula and a valve 9 for adjusting the raw water supply amount are provided. The pump 7 is optional such as a submersible pump or a ground-mounted pump.

Reference numeral 11 denotes an ozone mixture mechanism connected to the high level portion 61 of the raw water introduction system 6 via an interposition. This ozone mixing mechanism 11 preferably has an ejector function, for example, a fifth
As shown in the figure, a cylinder 11a, a throttle 11b provided in the middle portion of the cylinder 11a, and a gas conduit 11c communicating with a position near the downstream side of the throttle 11b are used.

The diaphragm 11b may be a fixed diaphragm or a variable diaphragm. In this embodiment, a disk-shaped member having a small diameter hole 110 in the center is used to form an orifice type fixed diaphragm. A plurality of the gas conduits 11c may be inserted at intervals, or may be a ring nozzle type. The gas conduit 11c has a flow rate adjusting valve 11d, and an ozone supply system 12a from an ozone generator 12 is detachably connected to the upstream side or the downstream side of the flow rate adjusting valve 11d.

Reference numeral 13 denotes a foamy filth removal mechanism arranged near the closed cylindrical tank 1, particularly at a height level equal to or higher than that of the top plate portion 1b.
The foamy filth removal mechanism 13 includes a closed container 13a, a filth discharge pipe 13b connecting a lower part of the closed container 13a and a closed space 14 created in the top region of the annular chamber (above the upper end level of the second tubular body 4). It is provided with a waste discharge pipe 13c for discharging foamy waste from the closed container 13a.

Reference numeral 15 is a circulation system for further enhancing the efficiency of removing contaminants, which is provided with a circulation pipe 15a and a small pump 15b interposed in the pipe line, and the take-out end of the circulation pipe 15a is located below the annular chamber 3. Connected to the area, and the discharge side end is the inlet 60 of the raw water introduction system 6
Is led to almost the same area as. The middle portion of the circulation pipe 15 is bent so as to rise to a level higher than at least the upper end 4a of the second cylindrical body 4 as shown in FIGS. 1 and 3, and a gas is added to the high level portion 15c. A mixing mechanism 11 'is interveningly connected. The structure of the gas mixing mechanism 11 'is similar to that of the raw water introduction system 6 described above, and preferably the ozone supply system 12a is branched and connected as shown in FIG.

Reference numeral 16 denotes a far-infrared radiation mechanism which is arranged at a proper position in the annular chamber 3 as necessary. In this embodiment, the annular chamber 3 is penetrated through the top plate portion 1b.
It is provided with a porous cylindrical casing 16a inserted therein and a far-infrared radiation firing body, for example, a mixed firing ceramic 16b, which is filled in the tubular casing 16a.

7 to 9 show another embodiment of the present invention. This embodiment is suitable for the case where the suspended solids in the raw water are fine and a large amount of particles, and the main treatment apparatus A having the structure shown in FIG. 1 to FIG. It has at least one sub-processor B connected in series.

The sub-processing device B may be placed separately from the main processing device A, but is preferably supported by a supporting member 70 such as a bracket around the closed cylindrical tank 1. In this embodiment, three sub-processing devices B are used, and the downstream devices B ₂ and B ₃ are gradually lowered in height level.

The structure of the sub-processing device B may be the one obtained by scaling down the main processing device A, but preferably the one having the structure schematically shown in FIG. 9 is used. That is, it has a sealed tank 100, a first tubular body 200 that hangs from a top plate portion 100b thereof, and a second tubular body 400 that is concentric with the first tubular body 200. An annular chamber 300 is provided between the inner surface and the first
An annular flow path 500 is formed between the cylindrical body 200 and the second cylindrical body 400, and a flow guide 170 is preferably stretched at an intermediate portion of the circular chamber 300.

An air bleeder 180 is provided in the top plate portion 100b of the tank 100, and a filth removal mechanism 130 is provided in the tank portion with respect to the closed space 140 above the annular chamber 300. The waste removal mechanism 130 in this case may be a simple conduit.

The treated water extraction system 10 is guided to an intermediate portion of the annular chamber 300 of the first sub-treatment device B _{1 so} that the end of the second cylindrical body 400 and the intermediate portion of the annular chamber of the _second sub-treatment device B ₂ communicate with each other. are connected by a system 10 _1,
Annular chamber middle portion of the second second cylindrical body bottom and the third sub-processor B ₂ of the secondary processor B ₃ are connected by communication system 10 _2, the second of the third sub-processor B ₃ is connected to the treated water extraction system 10 ₃ to the cylindrical body end, it is guided to the discharge system and the next stage of the purification device.

FIG. 10 shows another embodiment of the present invention. In this embodiment, one of the above two embodiments is used as the pretreatment device,
It is a combination of at least one biological purification device C on the downstream side thereof. The biological purification apparatus C may be of any biofilm method, for example, a sprinkling filter system, but it is preferable that the biological purification apparatus C has a structure such as that of the embodiment because of its large installation area and complicated mechanism.

This biological purification device C has a top plate portion 19b and a bottom plate portion 1 at the top and bottom.
A cylindrical closed tank 19a closed by 9c, and the closed tank 1
A water-permeable cylinder 19d arranged substantially concentrically with this in 9a, and a filter medium (for example, barley stone, coral, diatomaceous earth, black clay, etc.) filled between the water-permeable cylinder 19d and the closed tank 19a 19e. When,
It has a perforated plate 19f mounted on the upper layer of the filter medium 19e,
The water-permeable cylinder 19d is connected to the terminals of the treated water extraction systems 10 and 10 ₃ of the main treatment apparatus A or the sub-treatment apparatus B. Further, a purified water extraction system 20 for introducing purified water to the next-stage biological treatment apparatus C, or a discharge system, a circulation system or the like is connected to the side of the tank 19a at a higher level than the perforated plate 19f.

The biological purification apparatus C may be provided separately from the main processing apparatus A, or may be supported by a supporting means around it.

In addition, what is shown in the drawings is only an example of the present invention, and the present invention is not limited to this. For example, the following aspects are also included in the present invention.

a. Use multiple raw water introduction systems, branch the treated water extraction system into multiple branches, and lead them out from the tank to the water discharge system, sub-treatment device, or biological treatment device. In this case, the gas mixing mechanism does not necessarily have to be provided except for the main raw water introduction system.

b. A plurality of sets of the first tubular body 2 and the second tubular body 4 are provided in the closed tubular tank 1 at a required interval, and the treated water is independent or collected from the end of the second tubular body 4. It is taken out as an extraction system.

c. The treated water extraction system 10 shown in FIG. 1 is branched into a plurality of systems and led to the sub-treatment device B and the biological treatment device C.

[Operation of Example]

 Next, the operation of the embodiment of the present invention will be described.

In the embodiment shown in FIGS. 1 to 5, any of the pumps 7, for example, a water tank, a waterway, a river, a lake, a harbor, etc., is put in, and then the pump 15b is appropriately operated. As a result, the raw water is pumped up, the solid matter is removed by the filter 8, and the raw water is introduced through the raw water introduction system 6 as shown in FIG.
It is discharged from 60 into the annular chamber 3 in the closed cylindrical tank 1.

However, the raw water introduction system 8 has a high-level portion that rises on the upstream side of the introduction port 60 and is higher than the water level, and an ozone mixing mechanism 11 having a throttle 11b is provided in this portion.

Therefore, since the raw water passes through the throttle 11b having a reduced passage area, a pressure difference is generated before and after the throttle 11b, so that the ozone generator 12 from the gas introduction pipe 11c opening to the low pressure side into the cylinder 11a. Ozone is absorbed and dispersed and mixed in the raw water.

The flow rate of raw water passing through the raw water withdrawal system 6 is reduced, and the resulting differential pressure causes ozone to be sucked into the turbulent raw water, resulting in a vigorous agitation and mixing state. Raw water containing a large amount of ozone bubbles is introduced into the annular chamber 3 from the inlet 60 in a substantially tangential direction.

As a result, the ozone-mixed raw water rises while spirally rotating around the annular chamber 3, then loses its ascending force, descends, and counterflows with the subsequent upward swirling flow, whereby it is vigorously mixed. As a result, ozone becomes finer bubbles and comes into sufficient contact with raw water.

This ensures that the raw water is sterilized by ozone, and that the suspended solids contained in the raw water are entangled with ozone due to the adsorption and wetting effects of ozone bubbles, reducing the apparent specific gravity and buoyancy To rise in the annular chamber. Therefore, colloidal substances such as protein and starch that are hard to settle are also collected in air bubbles regardless of whether they are hydrophobic or hydrophilic. In addition, volatile dissolved substances such as ammonia, nitrous acid and hydrogen sulfide are also adsorbed and oxidized by contact with fine ozone bubbles, and oxidative decomposition of inorganic substances such as iron, manganese and cyan compounds and other organic compounds such as trichlorethylene. Then, the annular chamber 3 is raised.

If air is simply introduced from the bottom of the tank, it cannot be effectively mixed with the raw water and becomes coarse in the process of rising bubbles, so that fine suspended substances cannot be collected well.

On the other hand, the raw water from which suspended solids and volatile dissolved substances have been removed swirl up in the annular chamber 3, then descends through the gap 17a between the flow guide 17 and the first cylindrical body 4, and the resistance due to the filler 31 is increased. After the flow velocity is moderately weakened by the action, the lower end of the first tubular body 2 is dipped,
It flows into the annular flow path 5 between the inner second cylindrical bodies 4 and becomes an upward flow. The ascending flow flows in from the upper end 4a of the second tubular body 4, and this time becomes a downward flow, flows down in the second tubular body 4, and is taken out from the treated water extraction system 10 to the outside.

The upper end 4a of the second tubular body 4, that is, the opening, faces the top plate portion 1b of the closed tubular tank 1 at a predetermined distance, and therefore the level of the top end 4a is automatically kept at the constant water level WL. Therefore, the ring-shaped closed space 14 is always created at the top of the annular chamber between the water level WL and the top plate 1b.

As described above, the fine bubbles adsorbing the suspended substance and the volatile dissolved substance (dirt) are accumulated as fine bubbles by floating on the water surface of the closed space 14, and the filth is generated by the interface phenomenon between the bubbles and the water surface. The foam-like waste that has been concentrated and exceeds the volume of the sealed space 14 flows into the closed container 13a from the waste discharge pipe 13b, is appropriately extinguished therein, and is discharged from the waste discharge pipe 13c in the form of a dross with little water content. To be done.

Further, if the pump 15b is operated during operation, raw water is taken out from the lower part of the annular chamber 3, and while it is introduced to the upper part, another gas mixing mechanism 11 provided in the middle of the circulation pipe 15a. 'Or air or ozone is added, and as described above, it becomes a gas-liquid mixture and spirally rises,
It is agitated with the gas-liquid mixture from the inlet 60. Due to the synergistic effect of this, the waste separation efficiency becomes extremely high, and the S
The values of S, BOD, COD and harmful dissolved substances are greatly reduced, and the pH is adjusted.

Further, when the far-infrared radiation mechanism 16 is provided, the molecular motion of water becomes vigorous due to the action of far-infrared radiation, so the oxygen solubility in the raw water is increased and the bubbles are made finer, further improving the waste separation efficiency. To do.

Next, in the embodiment shown in FIGS. 7 to 9, the treated water taken out from the main treatment unit A is fed to the sub-treatment unit B, and the annular chamber 300 is spirally raised and then lowered. The annular flow path 500 rises from the lower end of the first tubular body 200, and enters into the interior from the upper end of the second tubular body 400 and descends. As a result, the waste that cannot be removed by the main processing unit A is adsorbed by the remaining air bubbles and floats up in the closed space 140, becoming foam and extracted from the waste removal mechanism 130. This operation is repeated when there are a plurality of sub-processing devices B, so that even super-particles are reliably separated and removed.

In the embodiment shown in FIG. 10, raw water is first pretreated by the main treatment unit A or its sub-treatment unit B.
COD, SS, pH, etc. are adjusted and BOD concentration is also reduced. Since the treated water having a low concentration component is sent from the extraction system 10 to the biological purification apparatus C, the load that affects the purification capacity of the hearth can be fixed and stabilized at a low level.

In the illustrated example, the treated water (organic) flows out in the radial direction while rising in the vertical water-permeable cylinder 19d, and then flows through the filter medium 19e.
, A biological film is formed on the surface of the filter medium by the oxygen in the treated water, the organic matter is adsorbed by the treated water coming into contact with it, diffuses into the membrane, and is aerobic due to the difference in oxygen concentration in the membrane, Anaerobic microorganisms and food chain ecosystems emerge. Floating organic matter is mainly removed in the part where the filter medium rapidly flows down, soluble organic matter is removed in the part where the filter material gently flows down, and clean water passes through the perforated plate 19f and is discharged from the purified water extraction system 20 into the circulation system. Sent to.

The present invention, as long as it has the above-described configuration, domestic drinking water including drinking water, sewage treatment, industrial water of various mining and industrial industries, wastewater treatment, treatment of fish farming facilities, rivers, lakes, harbor water The present invention can be applied to the treatment of all dirty water such as the treatment of No. 1 and is not limited to the examples.

[Specific Example 1] I. Soil sewage in a residential waterway was treated according to the present invention.

The apparatus used was that shown in FIGS. 1 to 5 (however, the far-infrared radiation mechanism and the ozone generator did not operate).

Specifications are tank inner diameter 350mmφ, height (bottom plate-top plate) 1200m
m, first cylinder inner diameter 100 mmφ, length 800 mm, second cylinder inner diameter 65 mmφ, enclosed space height dimension 100 mm, sewage introduction system 40 mm
φ, treated water extraction system 65mmφ, submersible pump 10
0V, 300rpm, circulation pump is magnet pump 50V, PMD15
Using 11B, the water flow rate is 1 ton / 18min, 100l / min respectively
And

II. 1 ton of sewage stock solution, liquid temperature: 14 ℃, pH: 7.35, ammonia: 19ppm, nitrous acid: 5.7ppm, COD: 79ppm, suspended matter: 23,00
It was 0 ppm.

As a result of treating these with the apparatus of the present invention, the liquid temperature: 18 ° C., p
H: 8.2, Ammonia: 10.8ppm, Nitrite: 1.5ppm, COD: 27pp
m, suspended solids: 540, significantly improving water quality.

The drainage discharged from the waste removal mechanism is foamy and black in color.
It was sticky and sticky, and was fully removed in a 30 cmφ x 30 cm bucket. Its components are ammonia: 64ppm, nitrous acid: 48ppm,
COD was 754 ppm.

[Specific Example 2] I. Potato shochu waste liquid was pre-treated according to the present invention. As the apparatus, the multistage type shown in FIGS. 7 to 9 was used. The number of sub-treatment devices was three, and the tank had the same inner diameter of 250 mmφ, height of 500 mm, first cylinder inner diameter, second cylinder inner diameter, and height of enclosed space as in the specific example 1. In addition, the ozone generator generates 15
Supplied 0 mg / h. Sodium carbonate was previously added to the stock solution.

II. This result is shown in comparison with the case of using a solid-liquid separator with a 100-mesh vibrating screen (comparative example).
It is as shown in the table.

From this result, it can be seen that the present invention can process the waste liquid extremely efficiently and with high performance.

Because the suspended solids and COD values are extremely low and the BOD concentration can be low, the load of biofilm treatment can be reduced, and the metabolic rate does not cause exfoliation and the BOD removal rate is about 90% or less within the retention time. The above can be done.

III. In addition, the SS starch discharged in the form of foam can be reused as a fuel by incineration or a methane gas fermenter, and can be regenerated as a pH sensor and organic fertilizer by drying by quick freezing.

[Specific Example 3] I. The present invention was applied to the seawater circulation treatment of the circulation type live fish IKEZ (total water amount: 700 l). The equipment used was that shown in Fig. 10 (one biological purifier). The specifications of the biological purifier were a tank inner diameter of 150 mmφ and a height of 1000 mm, and the water-permeable cylinder was made of mesh plastic 50 mmφ. The filter material was sand, coral, black soil, and diatomaceous earth.

II. Live fish cages with a water temperature of 18.3 ℃ have a dissolved oxygen content (COD) of 9.0
ppm, pH: 8.3, ammonia: 0.33 ppm, nitrous acid: 0.85 ppm, C
The OD was 2.61 ppm. When 5 kg of cultured sea bream was stored in this equipment and continuously treated with the above equipment, ammonia in the form of foamed effluent from the main treatment equipment: 3.9 ppm, nitrous acid: 60 ppm, C
OD: 180ppm removed, seawater environment DO: 6.7ppm, pH: 7.4
6. Ammonia: 2.0ppm, Nitrite: 0.54ppm.

III. After that, at a water temperature of 17.9 ℃, about 25 kg of cultured sea bream
When stored and treated with the above equipment, ammonia: 53 pp
m, nitrous acid: 11 ppm, COD: 165 ppm can be removed as waste liquid,
The seawater environment is DO: 7.3 ppm, pH: 7.93, ammonia: 7.4 ppm,
The nitrous acid was kept at 1.4 ppm.

IV. Cultured sea bream As a result of continued operation with a total capacity of 30 kg, ammonia: 50 ppm, nitrous acid: 70 ppm, COD:
98 ppm was removed, the seawater environment was kept in good clear seawater conditions of DO: 8.3 ppm, pH: 7.9, ammonia: 0.5 ppm, nitrous acid: 0.9 ppm, COD: 0, and a large amount of cultured sea bream was fatigued, diseased, There was no death.

〔The invention's effect〕

According to the invention described in claim 1 of the present invention described above, the closed cylindrical tank 1 is formed so as to form the annular chamber 3 between the closed cylindrical tank 1 and the inner surface of the closed cylindrical tank 1. The first cylindrical body 2 is inserted inside the first cylindrical body 2 so as to form a first cylindrical body 2 that does not reach the tank bottom from the inner top portion and an annular flow path 5 that communicates with a lower portion of the annular chamber 3. The second cylinder 4 that forms a closed space 14 at the inner top of the annular chamber 3 by stopping the upper end of the annular chamber 3 so that it does not reach the top of the tank, and the inlet 60 at the tip opens in a substantially tangential direction of the annular chamber 3. Then, the upstream side of the introduction port 60 rises to a level higher than the upper end of the second cylindrical body 4, and an ozone supply system is connected to the throttle 11b and the downstream side in the vicinity of this at the high-level part to pass through the raw water. The raw water introduction system 6 having an Othon mixing mechanism 11 for mixing ozone, and the conduit 13b are closed in the closed space 14. And a foamy filth take-out mechanism 13 for discharging the foamy filth trapped by the fine bubbles created by stirring the ozone-mixed raw water introduced into the annular chamber 3 to the outside of the closed cylindrical tank 1. Therefore, it is possible to create a raw water in which a large amount of ozone, which is a fine particle of bubbles, is mixed in the raw water introduction system 6 requiring a special pressure tank, and the ozone is generated in a large amount. The raw water containing water is blown into the annular chamber 3 having a limited volume between the closed cylindrical tank 1 and the first cylindrical body 2 in a substantially tangential direction, so that the raw water once rises in a spiral shape and loses lift and descends. It is mixed violently with the subsequent ozone-mixed raw water. For this reason, the raw water and ozone can be brought into sufficient contact with each other, whereby a large amount of colloidal substances that are difficult to settle can be reliably collected, and volatile dissolved substances can be reliably and promptly oxidized and floated. Moreover, since they are accumulated in the closed space 14 at the top of the annular chamber 3 as concentrated foam, they can be automatically and smoothly discharged from the conduit 13b. Then, the raw water dives under the lower end of the first tubular body 2 and the second tubular body 4
And the first tubular body 2 flow into the annular flow path 5 to rise and
The flow rate and flow velocity are controlled by passing through the bent flow path from the upper end of the cylindrical body 4 to the inside of the second cylindrical body 4 and the annular chamber 3 described above is controlled.
It is possible to surely adsorb and oxidize the suspended substances and volatile dissolved substances.

Therefore, it has a small and simple structure with a small bottom area, does not require a special means for aeration gas agitation, and requires a small ozone generator, yet it has high separation efficiency for suspended solids and volatile dissolved substances. It can be removed, and high efficiency and stable purification capacity can be maintained for a long period of time without overloading the biological treatment mechanism. In addition, since there are no movable parts, it is easy to operate, has few failures, and is extremely easy to maintain.

According to the second aspect of the present invention, the operation in which the suspended substance and the volatile dissolved substances are primarily removed and the raw water flowing down the annular chamber 3 is taken out and the gas is mixed with the raw water again to swirl up the annular chamber 3 is repeated. As a result, it is possible to obtain the effect that the fine suspended substances and harmful dissolved substances can be separated and removed more reliably.

According to the third aspect, it is possible to obtain the effect that the separation and removal can be surely performed even when the suspended substance is ultrafine and contained in a large amount.

According to the fourth claim, fine suspended substances and harmful dissolved substances are separated and removed with high efficiency, and the biological treatment is performed by adjusting the concentration and stabilizing the load by the pretreatment, so that clogging,
An excellent effect that stable seawater with poor water quality can be stably clarified without inviting exfoliation and metabolism of biofilm and metabolism is obtained.

[Brief description of drawings]

FIG. 1 is a partial cutaway perspective view showing a basic embodiment of a wastewater treatment apparatus according to the present invention, FIG. 2 is a partial cutaway plan view of the same, FIG. 3 is a perspective view of the same, and FIG. FIG. 5 is a vertical sectional front view, FIG. 5 is a sectional view showing an example of a gas mixing mechanism,
FIG. 6 is a system diagram for explaining the processing by the apparatus of FIG. 1, FIG. 7 is a perspective view showing another embodiment of the present invention, FIG. 8 is a plan view of the same, and FIG. 9 is of FIG. FIG. 10 is a vertical sectional front view showing another embodiment of the present invention. 1 ... closed cylindrical tank, 1b ... top plate, 1c ... bottom plate part, 2
...... First cylinder, 3 ... Annular chamber, 4 ... Second cylinder, 5
…… Annular channel, 6 …… Raw water introduction system, 7 …… Pump, 10…
… Processed water derivation system, 11 …… Ozone mixing mechanism, 11 ′ …… Gas mixing mechanism, 11b …… Throttle, 11c …… Gas conduit, 13 …… Dirt removal mechanism, 14 …… Closed space, 15 …… Circulation system , 15b ……
Pump, A ... Main processing unit, B ... Sub processing unit, C ...
Biological purification device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-39864 (JP, A) JP-A-55-97284 (JP, A) JP-A-51-116055 (JP, A) Actual development Sho-61- 175291 (JP, U) Actually opened 63-1697 (JP, U)

Claims (4)

[Claims] 1. A closed cylindrical tank 1 and an inner surface of the closed cylindrical tank 1 are formed so as to form an annular chamber 3 from the inner top of the closed cylindrical tank 1 to the bottom without reaching the bottom. 1 cylindrical body 2 and an annular flow path 5 communicating with the lower portion of the annular chamber 3 are inserted inside the first cylindrical body 2 and the upper end of the first cylindrical body 2 does not reach the inner top of the tank. The second cylindrical body 4 forming the closed space 14 at the inner top of the annular chamber 3 and the introduction port 60 at the tip end open in a substantially tangential direction of the annular chamber 3, and the upstream side of the introduction port 60 is the second Raw water which rises to a higher level than the upper end of the cylinder 4 and has an ozone mixing mechanism 11 for connecting ozone to the raw water that is passing through by connecting an ozone supply system to the throttle 11b and a downstream side in the vicinity of this at a high level portion. The introduction system 6 and a conduit 13b lead to the closed space 14 and agitate the ozone-mixed raw water introduced into the annular chamber 3. A sewage treatment apparatus comprising: a foamy filth removal mechanism (13) for discharging the foamy filth trapped by the fine bubbles created by stirring to the outside of the closed cylindrical tank (1). 2. A circulation system 15 connecting the upper and lower parts of the annular chamber 3 to each other.
The sewage treatment apparatus according to claim 1, further comprising a gas mixing mechanism 11 'provided in the circulation system. 3. A treated water extraction system is connected to a plurality of stages of sub-treatment devices, and the sub-treatment device hangs at least in a sealed tank and a first cylinder that extends from the top of the tank to the bottom of the tank. A second cylindrical body which is inserted so as to form an annular flow path between the body and the first cylindrical body, and whose upper end does not reach the inner top of the tank; An introduction system, one end of which is connected to an annular chamber formed between the circumference and a treated water extraction system, which communicates with the lower part of the second cylindrical body, and a closed space of the annular chamber, which communicates with each other and is adsorbed and collected by fine bubbles. The sewage treatment apparatus according to claim 1 or 2, further comprising a filth removal mechanism for discharging the foamed filth. 4. The sewage treatment / purification system according to any one of claims 1 to 3, wherein the treated water extraction system is connected to at least one stage purification system using a biofilm.