JPH02207882A - Device for treating sewage or the like - Google Patents

Abstract

PURPOSE:To extremely efficiently and continuously separate away the harmful hardly biodecomposable materials represented by fine suspended solids and sludge in sewage and the volatile dissolved materials contained therein by providing an ejector mecha nism having a cylindrical body provided internally with a throttle and a gas conduit connected to the downstream position of the throttle. CONSTITUTION:The pumped up raw water is subjected to removal of solid matter by a filter 8. A raw water introducing system 6 is provided with the gas mixing mecha nism having the throttle 11b. A pressure difference is generated before and behind the throttle 11b as the raw water passes the throttle 11b of the decreased passage area and, therefore, the air in the atm. is sucked into the cylindrical body 11a from the gas introducing pipe 11 opened to a low pressure side and is mixed and dispersed in the raw water. This gas-liquid mixture is introduced from an introducing port 60 into an annular chamber 3, then a guide 17 is provided in this area and, therefore, the air is vigorously mixed with the raw water to form the fine bubbles. Even the extremely hardly settling colloidal materials, such as protein and starch, are, therefore, captured by the bubbles regardless of whether these materials are hydrophobic or hydrophilic.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a wastewater treatment device.

[Conventional technology and its technical issues]

Water is said to be the blood of nature and is indispensable not only for general life but also for all kinds of industrial activities such as the mining industry.

Sedimentary substances such as sludge and sludge, and chlorine ions.

Inorganic dissolved substances such as sulfate ions, ammonia, hydrogen sulfide, nitrate ions, phosphate ions, fibers, sugars,
Contaminated by a wide variety of substances such as organic dissolved substances such as proteins, and toxic substances such as iron, manganese, cyanide, and phenol, this has a major impact on the living environment and the natural environment, and has the effect of Industrial activities are hindered.

For example, in 9 food manufacturing industries, the quality of wastewater is usually pH 2-9 and BOD 500-5. OOOppm.

5sso~4GG~4,0OOppi+, but for things like potato shochu waste liquid, it is about 3.6.
SS 26,000ppm, COD 42,000
It is an ultra-high concentration antibiotic with a BOD of 110,000 pp-. therefore.

If such waste liquid were to be discharged into a sewage facility, the activated sludge would die as it would extremely exceed the wastewater quality standard (BOD: 20-200pp■), resulting in a serious problem that would make it impossible to use it for sewage treatment. cause damage.

As a method for treating such wastewater, a method that combines a trickling filter and a biofilm is considered to be effective, but as mentioned above, due to the extremely poor water quality, the filter bed quickly becomes clogged.
Excessive loading causes the protozoa in the biofilm to become unstable, causing metabolism and peeling, making it less effective.Therefore, conventional biological treatment was considered impossible, and the method was to fill drums, seal them, and dump them at sea. was taken. However, this ocean dumping causes pollution problems, so there is an urgent need to establish treatment technology. As a countermeasure, it is possible to adjust SS, pH, COD, etc. in the pre-processing, but although pH can be adjusted to some extent with chemicals, SS particles are quite close to water molecules. This is because the particles are extremely fine.

This has been difficult to deal with since it cannot be removed by precipitation methods, filtration, etc.

Furthermore, the water quality of natural and man-made rivers, lakes, canals, ports, etc. is steadily deteriorating due to the inflow of sewage and other substances. This water contains a large amount of fine-grained organic matter (suspended matter) with a relatively large specific gravity called sludge, and contains large amounts of phosphorus, nitrogen, etc. that cause large amounts of blue-green algae, and has a low - , due to the generation of hydrogen sulfide, ammonia, nitrite, COD,
It has been extremely difficult to easily and efficiently remove such sludge, etc., which has an extremely high BDO value.

Furthermore, in recent years, with the development of aquaculture and fishing, it has become common practice to transport live seafood by ships, vehicles, etc. and stockpile it in live fish cages at consumption areas. In this case, it is essential to circulate and purify the seawater in storage tanks, shipping adjustment tanks, and tanks equipped with transportation means. They are plagued with problems that cause water pollution and lower survival rates.

The cause of this is the storage of large amounts of seafood, which exceeds the purification capacity.

Organic nitrogen oxides (ammonia, carbon dioxide, nitrous acid, hydrogen sulfide, etc.) due to the decomposition of excrement, food particles, etc. in seawater
This is because seawater accumulates and the load causes it to become rotten seawater, leading to the exfoliation of biofilms and bacterial metabolism even in biological purification systems with calculated functionality.

In this case, the problem is particularly harmful and difficult-to-biodegrade substances, and while female fish eggs can be easily removed with filters, the substances that cause the most contamination, such as male sperm and chair smears, are minute proteins. The reality is that it cannot be easily separated and removed because it passes through the filter.

Conventionally, physical treatment methods, chemical treatment methods, biological treatment methods, etc. have been used singly or in combination depending on the water quality and the substances to be treated as methods for treating industrial wastewater (wastewater), domestic wastewater, and sewage. Various methods for separating and removing substances have also been developed. However, conventional equipment is generally large and therefore takes up a large floor space, has a complex mechanism and many moving parts, has relatively low processing capacity, is complex to operate, and requires complicated maintenance such as backwashing. The present invention was devised to solve the above-mentioned problems, and its purpose is to have a compact and simple structure, and to be easy to operate. To provide a high-performance sewage treatment equipment that can continuously and efficiently separate and remove harmful, difficult-to-biodegrade substances such as fine suspended matter and sludge in sewage and volatile dissolved substances contained therein. be.

Another object of the present invention is to separate and remove harmful, difficult-to-biodegrade substances such as fine suspended solids and sludge, and volatile dissolved substances contained therein, as well as oxidative decomposition of organic compounds, iron, and hydrogen sulfide. An object of the present invention is to provide an apparatus capable of separating germs from inorganic substances such as nitrite ions and cyanide compounds.

Furthermore, by combining the present invention with a purification device that utilizes a primary biofilm and using it as a pretreatment means of the purification device, it is possible to effectively reduce the load and achieve chemotaxis, thereby maximizing the purification ability of the purification device. The object of the present invention is to provide a sewage treatment/purification device that can be used in a variety of situations.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a sealed tank, a first cylindrical body that descends from the top of the tank to the bottom of the tank and forms an annular chamber between it and the inner surface of the tank; is connected to the raw water introduction system having a gas mixing mechanism in the middle, and an annular flow path communicating with the annular chamber through the lower end opening of the first cylinder is formed between the first cylinder. The upper end opens at a height that does not reach the top of the tank, while
A second cylindrical body whose lower end communicates with the treated water extraction system and the closed space in the top area of the annular chamber are adsorbed and collected by fine bubbles from the gas-mixed raw water introduced into the annular chamber and accumulate in the closed space. The basic configuration includes a dirt removal mechanism that discharges foamy dirt to the outside.

The gas mixing mechanism preferably includes a cylindrical body provided with a restriction inside and a gas conduit connected to a position downstream of the restriction, and the ejector mechanism is configured to improve separation efficiency of foamy waste. , preferably also provided in the circulation system connecting the upper and lower parts of the annular chamber.

Further, an ozone supply system is connected to the gas conduit as necessary.

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

When the raw water quality is poor, the treated water extraction system is connected in series to one or more stages of sub-processing equipment having the same or similar configuration to the basic configuration. Thereby, the ultra-hard biodegradable substance and the volatile dissolved substances contained therein can be separated and removed more reliably.

[Embodiment] Figures 1 to 5 show a basic embodiment of the present invention. l is a vertically long tank installed on base 1a,
Made of galvanized steel, stainless steel, and synthetic resin with excellent corrosion and chemical resistance.

The upper and lower ends are sealed by the top plate part 1b and the bottom plate part IC.

Reference numeral 2 designates a first cylindrical body provided in the tank 1, the base end of which is fixed to the top plate part 1b, the tip part of which hangs down so as to stop at a level that does not reach the bottom plate part 1c. An annular chamber 3 having a relatively large volume is formed between the inner peripheral surface and the inner peripheral surface. This annular chamber 3 has an upward slope, preferably a spiral plate, for swirling and raising the mixed fluid of raw water and gas discharged into the annular chamber 3 to a position at a required height level from the bottom plate part 1c. A flow guide 17 is provided. The flow guide 17 does not completely partition the upper and lower parts of the annular chamber 3, but needs to have a passage gap 17a on the inner diameter side or the outer diameter side.

A filler material 31 with a coarse structure, such as porous honeycomb plastic, is installed below the flow guide 17, if necessary. When this filler 31 is used, it can provide appropriate resistance to the passage of raw water and function as a filter bed.

4 is a second cylindrical body arranged concentrically with the first cylindrical body 2 in the tank 1, and can form a relatively narrow annular flow path 5 between it and the first cylindrical body 2. A treated water take-out system 10 is formed at the lower end, is watertightly supported by the bottom plate part 1c, and has an upper end 4a opening at a required distance from the top plate part 1b, and a lower end extending from the tank 1 to the outside. is connected to. An air vent 18 is provided on the top plate portion 1b as an extension of the upper end 4a.
is provided.

Reference numeral 6 denotes a raw water introduction system, which is composed of a rigid pipe line, with an introduction port 60 at the tip opening in the vicinity of the flow guide 17, preferably in a substantially tangential direction of the annular chamber 3, and an upstream side of the introduction port 60. A level portion 61 is provided which is bent toward the side and is higher than the upper end 4a of the second cylindrical body 4. A flexible pipe line 6a equipped with a pump 7 for pumping raw water is connected to this wastewater introduction system 6, and a cartridge for collecting and accumulating solid substances is installed at a suitable midpoint of the flexible pipe line 6a. A type filter 8 and a valve 9 for adjusting the amount of raw water supplied are provided. The pump 7 is optional, such as a submersible pump or a ground-mounted water pump.

Reference numeral 11 denotes a gas mixture mechanism interposed and connected to the higher level portion 61 of the raw water introduction system 6. This gas mixing mechanism 11 is
It may be connected to a pressurized supply means such as a compressor, but preferably has an ejector function, for example, as shown in FIG. Ilb, and a gas conduit 11c communicating with a position near the downstream side of throttle Ilb is used.

The aperture llb may be a fixed aperture or a variable aperture.

In this embodiment, a disk-shaped member with a small diameter hole 110 provided in the center is used to form an orifice-shaped fixed diaphragm.

A plurality of gas conduits 11c may be inserted at intervals, or may be of a ring nozzle type. An ozone supply system 12a from the generator 12 is detachably connected.

Reference numeral 13 denotes a foam-like dirt removal mechanism disposed near the tank 1, particularly at a height level equal to or higher than the top plate portion 1b. The foam-like waste removal mechanism 13 includes a closed container 13a, and a waste discharge pipe 13b that connects the lower part of the closed container 13a to a closed space 14 created in the top region of the annular chamber (above the upper end level of the second cylindrical body 4); Waste discharge pipe 1 for discharging foamy waste from the closed container 13a
3c.

15 is a circulation system to further improve waste removal efficiency,
It is equipped with a circulation pipe 15a and a small pump 15b interposed in the pipe, and the outlet side end of the circulation pipe 15a is connected to the lower area of the annular chamber 3, and the discharge side end is connected to the raw water introduction system 6.
It is guided to approximately the same area as the inlet 60 of. As shown in FIGS. 1 and 3, the middle part 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 cylinder 4, and the high level part 15c is filled with gas. A mixing mechanism 11' is connected therebetween. The structure of the gas mixing mechanism 11' is similar to that of the raw water introduction system 6 described above.

Reference numeral 16 denotes a far-infrared ray radiation mechanism disposed at a suitable position in the annular chamber 3 as required, and in this embodiment, a porous cylindrical casing 16a inserted into the annular chamber 3 through the top plate portion 1b;
This is filled with a far-infrared emitting fired body, such as a co-fired ceramic 16b.

7-9 show another embodiment of the invention. This embodiment is suitable when the suspended solids in the raw water have fine particles and a large amount, and is connected in series to the main treatment device A having the structure shown in FIGS. 1 to 6 and its treated water extraction system 10. and at least one sub-processing device iB connected in the same manner.

Although the sub-processing device B may be placed independently from the main processing device A, it is preferably supported around the tank 1 by a support member 70 such as a bracket. In this embodiment, three sub-processing apparatuses B are used, and the downstream ones Bx=Bz are successively lowered in height.

Although the structure of the sub-processing device 1B may be a scaled-down version of the main processing device A, it is preferable to use a structure as schematically shown in FIG. 9. That is, a sealed tank 100, a first cylindrical body 200 hanging from the top plate 100b, and a second cylindrical body 40 concentric therewith.
0, an annular chamber 3°O exists between the first cylindrical body 200 and the inner surface of the tank, and an annular chamber 3°O exists between the first cylindrical body 200 and the second cylindrical body 400.
An annular flow path 500 is formed between the annular chamber 500 and preferably a flow guide 170 is provided in an intermediate portion of the annular chamber 500.

In addition, an air vent 18 is provided on the top plate portion 100b of the tank 100.
0 is provided, and a dirt removal mechanism 130 is provided at a tank portion relative to the closed space 140 in the upper part of the annular chamber 300. The waste removal mechanism 130 in this case may be a simple conduit.

The first sub-processing device! A treated water extraction system 10 is led to the middle part of the annular chamber 300 of B1, and a communication system 10. Connected to the second sub-processing unit! The lower end of the second cylindrical body of Bs and the intermediate portion of the annular chamber of the third sub-processing bag WB1 are connected to the communication system 10. A treated water take-out system 10m is connected to the end of the second cylindrical body of the third sub-processing device B3, and is led to a discharge system, a next-stage purification device, etc.

FIG. 10 shows another embodiment of the invention.

In this embodiment, one of the above two embodiments is used as a pre-processing device, and at least one biological purification bag WIC is combined on the downstream side thereof.

The biological purification device C may be of any biofilm method, such as a trickling filter method, but it is preferable to have a structure like that of the embodiment because it requires a large installation area and its mechanism is complicated.

This biological purification device C includes a cylindrical sealed tank 19a whose top and bottom are closed by a top plate part 19b and a bottom plate part 19a, and a water-permeable cylindrical body arranged approximately concentrically within the sealed tank 19a. A filter medium 19e (for example, maifan stone, coral, diatomaceous earth, black soil, etc.) filled between the water-permeable cylindrical body 19d and the closed tank 19a, and a perforated plate 19f attached to the upper layer of the filter medium 19e. The porous cylinder 19d is connected to the treated water extraction system 10.1 of the main treatment device A or the sub-treatment device B.
0□ terminals are connected. and the perforated plate 19f
On the side of the tank 19a at a higher level is the next biological treatment device C1 or a discharge system.

A purified water extraction system 20 is connected to introduce purified water to a circulation system or the like.

The biological purification device c may be placed separately from the main treatment device A, or may be supported around it by support means.

Note that what is shown in the figure is just a few examples of the present invention, and the present invention is not limited thereto.For example, the following embodiments are also included in the present invention.

a. Multiple raw water introduction systems are used, and the treated water extraction system is branched into multiple parts to be led out from the tank and led to the water discharge system, sub-treatment equipment, or biological treatment equipment.

In this case, it is not necessarily necessary to provide a gas mixing mechanism except for the main raw water introduction system.

b. A plurality of sets of the first cylindrical body 2 and the second cylindrical body 4 are provided in the tank 1 at a required interval, and each independent or collective treated water extraction system is used from the end of the second cylindrical body 4. Take it out.

C1 The treated water take-out system 10 shown in FIG.

[Effect of the embodiment]

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

In the embodiments shown in FIGS. 1 to 5, the pump 7 is put into any water tank, irrigation canal, river, lake, harbor, etc., and then the pump 15b is operated as appropriate. As a result, the raw water is pumped up, solid matter is removed by the filter 8, and the raw water is discharged through the raw water introduction system 6 from the inlet 6o to the annular chamber 3 in the tank 1 as shown in FIG. is provided with a gas mixing mechanism 11 having a throttle Ilb, and as the raw water passes through the throttle 11b with a reduced passage area, a pressure difference is created before and after the throttle Ilb. From the pipe 11c to the cylinder 11
Air from the atmosphere is sucked into the tank a and mixed and dispersed in the raw water.

When this gas-liquid mixture descends the raw water introduction system 6 and is introduced from the annular chamber 3 through the inlet 60, a flow guide 17 is provided in this area.
, the gas-liquid mixture rises while going around the annular chamber in a spiral shape due to the guiding effect, and then loses its upward force and descends, and flows by itself with the subsequent upward swirling flow, so that the air flows into the raw water. The mixture is vigorously mixed to form fine air bubbles.

As a result, suspended substances contained in the raw water become entangled due to the adsorption and wetting effects of the air bubbles, their apparent specific gravity is reduced, and they adhere to the air bubbles and rise in the annular chamber due to the buoyancy of the air bubbles. Therefore, colloidal substances that are difficult to settle, such as proteins and starches, 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 to rise. If air is simply introduced from the bottom of the tank, it cannot be mixed effectively with the raw water, and the air bubbles become coarse as they rise, making it impossible to effectively collect fine suspended solids.

After swirling up the annular chamber 3, the raw water descends through the gap 17a between the flow guide 17 and the first cylinder 4, and after the flow velocity is moderately weakened by the resistance action of the filler 31, it flows into the first cylinder. body 2
The flow passes through the lower end of the flow path, flows into the annular flow path 5 between the inner second cylindrical bodies 4, and becomes an upward flow.

The upward flow enters from the upper end 4a of the second cylindrical body 4.

This time, it becomes a downward flow and flows down inside the second cylindrical body 4.

The treated water is taken out from the treated water take-out system 10 to the outside.

The upper end 4a of the second cylindrical body 4, that is, the opening, faces the top plate portion 1b of the tank 1 at a predetermined distance. Therefore, the level of the top end 4a automatically becomes the water level WL at all times. A ring-shaped sealed space 14 is created at the top of the annular chamber between the water level WL and the top plate portion 1b.

As mentioned above, the fine bubbles that have adsorbed suspended solids and volatile dissolved matters (filth) float on the water surface of the closed space 14 and accumulate as fine foam, and due to the interface phenomenon between the foam and the water surface, the dirt is removed. The foamy waste that is concentrated and exceeds the volume of the closed space 14 flows into the closed container 13a from the waste outlet pipe 13b, where it is properly dissipated, and is discharged from the waste discharge pipe 13c in the form of mud with less moisture. be discharged.

Furthermore, if the pump 15b is operated during operation, the annular chamber 3
While the raw water is taken out from the lower part of the tank and introduced into the upper part, air is added from another gas mixing mechanism 11' provided in the middle of the circulation pipe 15a, and the gas-liquid mixture is formed into a spiral shape. The gas is swirled upward and stirred 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 values of SS, BOD, COD and harmful dissolved substances in raw water are significantly reduced and the levels are also adjusted.

Note that when ozone is supplied from the ozone generator 12 during the above operation, it is added and mixed into the raw water from the gas conduit 11c, so that inorganic substances such as iron, manganese, and cyanide compounds and other organic compounds such as trichlorethylene are It is oxidized and decomposed, entangled with fine bubbles in the annular chamber 3, floated and separated, and deodorized at the same time. Furthermore, when the far-infrared radiation mechanism 16 is installed, the action of far-infrared rays increases the molecular movement of water, which increases the amount of oxygen dissolved dust in the raw water and makes the bubbles more fine, further improving waste separation efficiency. do.

Next, in the embodiments shown in FIGS. 7 to 9, the treated water taken out from the main treatment device A is sent to the sub-treatment device B, ascends spirally through the annular chamber 300, and then descends. ascending the annular flow path 500 from the lower end of the cylinder 200 of No. 1,
It enters the inside of the second cylindrical body 400 from the upper end and descends. As a result, the filth that could not be removed by the main processing device A is adsorbed by the remaining air bubbles, floats to the closed space 140, becomes foam, and is extracted from the filth removal mechanism 130. When there are multiple sub-processing devices B, this operation is repeated, so
Even super particles are reliably separated and removed.

In the embodiment shown in FIG. 10, 1M water is first subjected to preliminary treatment by the main treatment device A or its sub-treatment device B, so that COD, SS, pH, etc. are adjusted, and the BOD concentration is also reduced. Since the treated water containing low-concentration components is sent from the extraction system 10 to the biological purification device C, the load that affects the purification ability of the hearth can be kept constant and stable at a low level.

In the illustrated example, the treated water (organic) flows out in the radial direction while rising through the vertical water permeable cylinder 19d and comes into contact with the filter medium 19e, and a biological film is formed on the surface of the filter medium due to the oxygen in the treated water. When treated water comes into contact with this, organic matter is adsorbed and diffused into the membrane, which becomes aerobic due to the difference in oxygen concentration.

An ecosystem of anaerobic microorganisms and food chains emerges.

Floating organic matter is mainly removed in the part where the filter medium flows down rapidly, and soluble organic matter is removed in the part where it flows down slowly.The clean water passes through the perforated plate 19f and is sent from the purified water take-out system 20 to the discharge system and the circulation system. etc. will be sent to.

As long as the present invention has the above-described configuration, the present invention can be applied to treatment of domestic water including drinking water, sewage, industrial water of various mining and manufacturing industries, treatment of wastewater, treatment of fish farming facilities, rivers, lakes, marshes, ports, etc. It goes without saying that the invention is applicable to all types of dirty water treatment, such as water treatment, and is not limited to the examples.

Next, experimental results of the present invention will be shown as specific examples.

[Specific example 17 ■0 According to the present invention, sewage from a residential area waterway was treated.

The equipment shown in Figures 1 to 5 was used (however, the far-infrared radiation mechanism and ozone generator were not operated). Specifications are tank inner diameter 350■φ, height (bottom plate to top plate) 1200+
*m, first cylinder inner diameter 10G-φ, length 800s+m,
The second cylindrical inner diameter is 65 mm, the height of the closed space is 100 mm,
The sewage inlet system has a diameter of 40 mm, and the treated water extraction system has a diameter of 65 m5 + diameter.The pump is a submersible pump of 100 V, 300 rpm, and the circulation pump is a magnet pump of 50 V, PMD1511B.The water flow rate is 1 ton/18 ain, 10, respectively.
0 Q/gIin.

■, sewage stock solution is 1 ton, liquid temperature 14℃, pl (7,35,
Ammonia 19ppm, nitrite 5.7ppm, C0D2
7pp■, suspended solids 23.0OOpp.

As a result of treating these with the apparatus of the present invention, the liquid temperature was 18°C,
-8.2, ammonia 10.8PP meal.

Nitrite 1.5pp Otori, C0D 27pp ■, l! The amount of turbidity was 540, and the water quality was significantly improved.

The liquid discharged from the waste removal mechanism is foamy and black in color.
It was thick and sticky, and a full bucket of 30cm x 30cm was removed. Its ingredients are ammonia 64pp garden,
Nitrite was 48 pp, and C0D was 754 pp.

[Specific example 2] 1. According to the present invention, potato shochu waste liquid was pre-treated.

The multi-stage apparatus shown in FIGS. 7 to 9 was used.

There are three sub-processing devices, and the tank has an inner diameter of 250 mmφ.
The height of 500 mm, the first cylindrical inner diameter, the second cylindrical inner diameter, and the height of the closed space were the same as those of the first specific example. Further, 150 mg/h of ozone was supplied by an ozone generator. Sodium carbonate was added to the stock solution in advance.

(2) The results are shown in Table 1 below in comparison with the case using a solid-liquid separator with a 100-mesh vibrating screen (comparative example).

Table 1 From the results, it is clear that the present invention can treat inferior waste liquids extremely efficiently and with high performance.

The suspended solids and COD values are extremely low, and the BOD concentration can be lowered, making it possible to reduce the burden of biofilm treatment and achieve a BOD removal rate of approximately 90% or less within the retention time without causing metabolism or peeling. You can do more than that.

(2) The SS starch discharged in the form of foam can be reused as fuel by incineration or in a methane gas fermenter, and can be recycled as a sensor or organic fertilizer by drying it by rapid freezing.

[Specific Example 3] Summer 0 The present invention was applied to seawater circulation treatment for live fish Ikesu (total water volume 700Q). The apparatus shown in Figure 10 (one biological purifier) was used. The specifications of the biological purifier were as follows: Tank inner diameter: 150 mmφ, height: 1000 tubes, water-permeable cylindrical body: mesh-like plastic, 50 mmφ Filter media: sand, coral, black soil, diatomaceous earth.

■The live fish Ikesu, whose water temperature is 18.3℃, has a dissolved oxygen content (CO
D) 9.0ppm, pH 8.3, ammonia 0.33p
pm, nitrite 0.85 ppm, and COD2゜61 pp-.When this was continuously treated with the above equipment with 5 kg of aquaculture limit stored in it, ammonia 3゜9PP seaweed was produced in the form of foamy drainage from the main treatment equipment. , Nitrite 60Pp Otori, C
0D180pp plow removed, seawater environment DO6,7p
p■, p) 17.46, ammonia 2.0ppm, and nitrite 0.54ppm.

(2) After that, approximately 25 kg of aquaculture net was further stored at a water temperature of 17.9°C and treated with the above equipment, resulting in 53 ppm of ammonia, 11 ppm of nitrite, and 165 ppm of C0D.
can be removed as wastewater, and the seawater environment has a DO of 7.3pp.
pH 7.93, ammonia 7°4 ppm+, nitrous acid 1
．． It was kept at 4 ppm.

■As a result of continuing operation with a total of 30 kg of cultured steel stored, the effluent contained 50 ppm of ammonia and 70% of nitrous acid.
P, Sono, C0D98pp- has been removed, and the seawater environment is DO
8.3 ppm, p17,9.7'/monia 0.5 ppm ugliness, nitrite 0.9 ppm, COD O maintained in good clear seawater conditions, and a large number of aquaculture nets were free of fatigue, disease, and death. .

〔Effect of the invention〕

According to the invention described in claim 1 of the present invention described above, it is possible to separate and remove fine suspended solids and harmful dissolved substances with high efficiency using a small and simple structure with a small bottom area. Moreover, since there are no moving parts, it is easy to operate, has few breakdowns, and is extremely easy to maintain.

According to the second claim, fine suspended solids and harmful dissolved substances are separated more reliably by mixing gas with raw water and performing foam treatment, and then circulating the treated water and repeatedly performing foam treatment. ,
The effect is that it can be removed.

According to the third aspect, since there is no need for a compressor or any other mechanism for pressurizing the gas to be mixed, it is possible to obtain the effect that the apparatus can be further simplified.

According to the fifth aspect, it is possible to reliably separate and remove suspended substances even when the suspended substances are extremely fine and are contained in large quantities.

According to the sixth claim, fine suspended solids and harmful dissolved substances are removed with high efficiency, and biological treatment is performed by adjusting the concentration and load-chemotaxis through this pre-treatment, thereby preventing clogging. , an excellent effect can be obtained in that seawater of poor water quality can be stably made clear without causing exfoliation of biofilms, outflow, metabolism, etc.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a basic embodiment of the sewage treatment equipment according to the present invention, Fig. 2 is a partially cutaway plan view thereof, Fig. 3 is a perspective view thereof, and Fig. 4 is a main body of the equipment. A vertical front view, FIG. 5 is a sectional view showing an example of a gas mixing mechanism,
FIG. 6 is a system diagram explaining the processing by the apparatus shown in FIG. 1, FIG. 7 is a perspective view showing another embodiment of the present invention, FIG. 8 is a plan view thereof, and FIG. FIG. 10, which is a processing system diagram of the apparatus, is a longitudinal sectional front view showing another embodiment of the present invention. 1...Tank, 1b...Top plate, 1c...Bottom plate part,
2... First cylindrical body, 3... Annular chamber, 4... Second cylindrical body, 5... Annular channel, 6... Raw water introduction system, 7...
・Pump, 10... Treated water outlet system, 11.11'...
- Gas mixing mechanism, 11a... cylinder, 11b... aperture, 11c... gas conduit, 13... filth removal mechanism,
14... Closed space, 15... Circulatory system, 15b...
Pump, 17... Guide, A... Main processing device, B.
... Sub-processing device, C... Biological purification device.

Claims (6)

[Claims] (1) A sealed tank, a first cylindrical body that descends from the top of the tank to a limit that does not reach the bottom of the tank and forms an annular chamber between it and the inner surface of the tank, one end of which is connected to the annular chamber, and a gas A raw water introduction system equipped with a mixing mechanism is positioned so as to form an annular flow path communicating with the annular chamber through the lower end opening of the first cylinder, and the upper end is located at the top of the tank. A second cylindrical body that opens at a height that does not reach the maximum height, while the lower end reaches the treated water extraction system, communicates with the sealed space in the top area of the annular chamber, and the gas-mixed raw water introduced into the annular chamber. What is claimed is: 1. A sewage treatment device comprising: a filth removal mechanism for discharging to the outside foam-like filth that is adsorbed and collected by fine air bubbles and accumulated in a closed space. (2) The sewage treatment apparatus according to claim 1, wherein a circulation system connecting the upper and lower parts of the annular chamber is connected, and the circulation system is provided with a gas mixing mechanism. (3) The sewage treatment and purification device according to claim 1 or 2, wherein the gas mixing mechanism includes a cylindrical body provided with a throttle inside and a gas conduit connected to a downstream position of the throttle. . (4) The sewage treatment and purification device according to claim 3, including one in which an ozone generator is connected to the gas conduit. (5) The treated water extraction system is connected to several stages of sub-processing equipment, and the sub-processing equipment includes at least a closed tank and a first cylindrical body that hangs down from the top of the tank to the bottom of the tank. , a second cylinder which is inserted so as to form an annular flow path between it and the first cylinder, and whose upper end does not reach the top of the tank, and the first cylinder and the inner periphery of the tank. An introduction system, one end of which is connected to the annular chamber formed between them, and a treated water extraction system, which leads to the lower part of the second cylindrical body, communicate with the sealed space of the annular chamber, and the treated water is adsorbed and collected by microbubbles. 5. A sewage treatment device according to any one of claims 1 to 4, comprising a filth removal mechanism for discharging foamy filth. (6) The sewage treatment and purification device according to any one of claims 1 to 5, wherein the treated water take-out system is connected to at least one stage of purification device using a biofilm.