KR930011683B1 - Waste water treating apparatus - Google Patents

Abstract

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Description

Wastewater treatment unit

1A, 1B, 1C, and 1D are side views and radial cross-sectional views of the contact materials used in the present invention, respectively.

2A and 2B are side and radial cross-sectional views, respectively, of the contact unit used in the present invention.

3A and 3B are front and side views, respectively, of a contact module for holding and fixing a contact unit to a frame.

4 is a cross-sectional view of an aeration tank in which contact module is used.

5A and 5B are flowcharts each showing an example of an apparatus for performing a catalytic oxidation method using a conventional activated sludge method and an acid engine method, respectively.

6 is a view showing an example of a catalytic oxidation method using a new engine system of the conventional method.

7 shows an example of a conventional catalytic oxidation method using an diffuser as an acid substrate.

8A and 8B show an example of the wastewater treatment apparatus of the present invention using a pressurized water tank and an ejector.

9A is a view showing an example of the wastewater treatment apparatus of the present invention using an ejector.

9b is a schematic diagram of an ejector for use in the present invention.

* Explanation of symbols for main parts of the drawings

1: soft plastic pipe inserted through core wire 2: loop

3: discontinuous focused yarn 4: polyvinylidene chloride filament

a: Length between tip of loop b: Spiral pitch

c: inner diameter d: distance between the ends of the loop

5, 9a, 9b, 9c, 31: Aeration tank 6: Waste water inlet

7: treated water outlet 8: adjusting tank

10, 32: contact material module 11: the compressor

12 sedimentation tank 13 dehydrator

14: incinerator 15: contact material unit

16: frame 17: line

21: diffuser 22: diffuser

33: treated water 34: ejector

35: pressurized water tank 36: compressor

41 discharge pipe 43 pressure gauge

44, 45: pump

The present invention relates to a pollution prevention technology.

The present invention has a significant effect on the biological treatment of wastewater, in particular by catalytic oxidation. Applicable drainage includes sugar drainage, fish processing drainage and residential wastewater.

The term "contact oxidation method" used in the present invention is a method of improving the activated sludge method, and is a method of aeration by putting a contact material such as cedar branch to grow and cultivate microorganisms in an aeration tank.

The term "contact material" used in the present invention means a carrier for forming, proliferating and cultivating microbial colonies in biological treatment of water withdrawal, water, sewage, sludge, etc. Carrier and the like.

Other terms used in the present invention will be described later.

As a biological treatment method of the conventional wastewater, the active sludge method is currently widely applied. The activated sludge process is usually composed of four steps of returning the initial settling basin, the aeration tank, the last settling basin and the activated sludge to the aeration tank. The activated sludge method is generally suitable for the treatment of organic wastewater, but in order to properly operate this method, it is necessary to allow the microorganisms required for purification to be properly present in the activated sludge and to be fully active. In addition, since the active sludge method requires a long aeration time and a large amount of air, the aeration operation accounts for a large part of the operation and maintenance costs. Therefore, various improvement methods have been developed in consideration of operation stability, processing efficiency, maintenance difficulty, and economic efficiency.

The catalytic oxidation method, which is an improvement of the activated sludge method, is a method of aeration by putting a contact material for fixing microorganisms in an aeration tank. The effect of the catalytic oxidation method is that the amount of microorganisms in the aeration tank is increased, so that the treatment efficiency is improved, and plant chains by various microorganisms that grow and cultivate in the contact material are established, and the amount of surplus sludge is reduced. On the other hand, since the microorganisms excessively proliferate in the contact material and the flow of the mixed solution deteriorates, there is a disadvantage that the movement of oxygen is hindered. Therefore, what material, formation and physical properties are selected for the contact material is an important subject of the catalytic oxidation method.

The conventional method of contact materials used in the catalytic oxidation method is to obtain the growth and cultivation of microorganisms in the form of a plate, and that the number of these microorganisms can increase and maintain many microorganisms. Plastics have been employed. This kind of planar contact material has microorganisms grown and cultivated relatively thickly in the contact material, but when the thickness reaches a predetermined amount or more, there are disadvantages such as blockage or peeling off. Therefore, it is necessary to limit the load of the amount of BOD to the processing apparatus or to perform cumbersome additional management operations which must form a cleaning mechanism for the contact material.

Moreover, in the conventional aeration method, the method of using a diffuser, such as a cylindrical plate shape and a dome shape, is made by supplying air with a blower, and discharging it in water.

The method of assembling the diffuser includes a front aeration method performed from below the filling contact material, a linear concentrated aeration method at the non-charged portion of the contact material, and a diffuser arranged at right angles to the water flow below the contact material. Although both are performed, it is a method of mixing and contacting wastewater and air by crude swirling and up-down flow.

The linear concentration aeration at the non-contacting part is surprisingly small at the center of the filling contact, and the flow rate at the non-filling part is faster, resulting in a lower biofouling near the upstream, and the placenta of the bubble is released into the atmosphere. In addition, the front aeration and the linear aeration method orthogonal to the water flow can obtain the water flow at the center of the contact material, but the detachment of the adherent biofilm is likely to occur, and the result has a subtle effect on the state type at the surface of the adherent organism. In addition, it is necessary to take out the contact material for exchanging the diffuse organs at the time of occurrence of blockage and the like, and the detachment of adherent organisms at this time results in a decrease in the post-treatment effect.

The present invention solves such a problem and provides a catalytic oxidation method of wastewater which exhibits a high treatment efficiency without microbial growth and cultivation in low contact materials.

Industrial Applicability The present invention provides an aeration tank having a contact material that does not exfoliate or drop off microorganisms that have grown and cultivated, and whose aeration amount is smaller than that of the conventional one.

The present invention provides a method and apparatus for contact oxidation of wastewater, in which aeration tanks are arranged in multiple stages to form concentration gradients in each group of organisms, thereby significantly increasing the efficiency of treatment target values, removal of phosphorus, and the like.

According to the present invention, there is provided a method and apparatus for catalytic oxidation of wastewater in which sludge generation is very small and unnecessary removal of excess sludge is unnecessary.

Problems solved by the present invention will be apparent from the following.

The above-mentioned problem consists of a plurality of discontinuous yarns and non-flammable filaments arranged in such a manner as to intersect with each other in a peripherally inclined direction of a suitable core wire in a multi-stage contact oxidation step in the treatment of wastewater. The aeration tank is used by arranging the contact material drawn out between the winding parts and forming an independent radial loop of 11-14 mm unbounded state in the radial outward direction of the core wire by each filament. This is solved by supplying a mixture with air into the aeration tank under high pressure. This filament is preferably polyvinylidene chloride.

The contact material used in the present invention is charged by a change in the concentration of micro ions in the water, and effectively attaches and grows the microorganisms generated in the water to the loop, and the microorganism repeats water supply growth under conditions such as oxygen. By filling this loop, the entire contact material shows a rod shape. The maximum diameter at this time is about 20-35 m / m, and there is no enlargement beyond the state. Oxygen supplied from the water from this process is gradually consumed from the deposit surface layer, and becomes smaller as it goes to the center portion, thereby becoming a anaerobic anaerobic state. This causes the microbial activity is a microscopic change in the in the sludge is deposited, biological fluids or metabolic decomposition of water, the consumption of O _2, carbon dioxide gas, the release of the gaseous substances of the methane gases, the all conditions of the micro environment, such as changes caused by microorganisms of various mugiche Change big In this state, protozoa are suspended in a large number of entangled microorganisms and eggs in the radial loop, and bacteria and chlorella are suspended. In addition, many bacteria and chlorella adhere to the surface of hunting. As a result, the following results have been reported as to what the biological meaning of a colony of a microbial group is. This is done by comparing two organisms that were incubated under the same conditions, one making a colony and the other not making it. Thus, the following experimental results are reported. In other words, it is a stable phase which does not form a colony only by stirring the water which cultured the microorganism for several tens of seconds a day, and the stationary side forms a colony.

As a result of the investigation of both living organisms, the former does not generate earthworms at all, and microorganisms such as rotifers and protozoa have a significant decrease in the number of solids, which is about 1/10. This experiment shows experimentally that the destruction of the system structure inhibits the diversification of seeds and the increase in the number of solids. Therefore, the structure of the system is an essential requirement for more seeds to coexist and stabilize. If so, why colonization may lead to diversification and increase in number of seeds, perhaps because diversification of environmental structure provides a suitable habitat for more seeds, and the efficient transfer and transfer of energy materials between organisms? I can guess. When colonies are formed, the creatures are in close proximity to each other, allowing predators to efficiently feed and avoid predation by hiding in the colony. So bacteria, chlorella, and protozoa never get stuck in the earthworms or rotifers. Next, the colony is thought to have a site where the metabolites are adsorbed and concentrated, which is suitable for living organisms that increase metabolites such as bacteria, chlorella, and hunting, but increase metabolism around them. It is thought that the concentration of water diffuses in the liquid part and is dilute, which makes it possible to coexist in the colony with a weak organism in the metabolites such as rotifers, terrestrial animals or earthworms. These different concentrations of metabolites locally coexist in different colonies to shorten the distance from each other, effectively create an environment for reproduction and reuse, and colonies are necessary for the transfer, transfer, and circulation of energy. It includes producers, consumers, and decomposers, almost satisfying the form of self-sufficiency. In addition, a large number of colonies exist at substantially equal intervals and surrounded by a liquid layer and an upper layer are considered to compensate for deficiencies or imbalances in a specific colony, and this structure differentiation serves to protect the system from the outside. I think you are doing.

As demonstrated by citing several theories above, the imbalance between various organisms is obtained, the colony activity is stable by the nutrients supplied in turn, and generation replacement is performed in the delicate structure of the contact material of the present invention. The sludge attached to the ring contributes to the achievement of the initial purpose, while maintaining its diameter of about 20 to 35 mm / m without being obese indefinitely. Of course, in order to stabilize this state, how to adjust the amount of dissolved oxygen in each tank must be recognized as the most important requirement, and as in the conventional method, by simply generating oxygen supply means and water flow The condition that the supply of oxygen for each biomass should be satisfied by the proper distribution of oxygen to the center of about 29-35m / m in diameter and around 35m / m of attached sludge, not just aeration due to the simple idea of contact effect. As long as this condition is satisfied, the sludge is not enlarged indefinitely.

The unique shape and structure of the contact material of the present invention, the microorganisms grown and cultivated therein, and the plant chain in water have been described above. Next, the configuration of the present invention will be described.

The present invention is composed of a plurality of discontinuous yarns and non-flammable filaments arranged to intersect with each other in the peripheral inclination direction of the flexible plastic pipe through which the core wire is inserted, and the filaments are drawn out between the wound portions of the bundled yarns by each filament. The contact agent is formed in the aeration oxidizing tank by forming an independent radial loop of 11-14 mm in an unbounded state radially outward of the core wire, and the aeration tank supplies a mixture of circulating water and air into the aeration tank under high pressure. It features. In the present invention, the non-flammable convergent yarn and the non-flammable filament are not wound directly on the core wire, but the core wire is inserted into the soft plastic pipe, and the non-flammable convergent yarn and the non-flammable filament are wound on the plastic pipe. This prevents corrosion of the core wire by oxidation and generation of static electricity.

EMBODIMENT OF THE INVENTION With reference to drawings, the shape, structure, use form, etc. of the contact material of this invention are demonstrated.

1a, b, c, and d are side views and radial sectional views of the contact member used in the present invention, respectively. The contact member used in the present invention is a radial loop (2) formed in the radial direction of the flexible plastic pipe (1) through which a core wire such as an aluminum alloy of about 2mm diameter is inserted, and the length from the tip to the tip of the loop (a ) Ranges from 20 to 35 mm. The length of the core wire 1 is arbitrarily selected according to the size of the aeration oxidizing tank to be used. When the contact material of the present invention is used in the aeration oxidizing tank, it is molded into various shapes such as rods, spirals, and the like. This resistance to flow in the tank creates a gentle swirling flow in the vicinity of the contact material, thereby increasing the contact effect. 2A and 2B are side views and radial cross-sectional views, respectively, of spiral contact-shaped contact members. In FIG. 2A, (b) is a spiral pitch measured at the tip of the loop and the pouf and is set to 35 mm or more.

In FIG. 2B, (c) is 35 mm or more as an inner diameter measured at the tip of a loop. That is, the present invention is composed of a plurality of non-flammable focusing yarns and non-combustible polyvinylidene chloride filaments arranged to cross each other in the peripheral inclination direction of the wire rod, and the filaments are drawn out between the winding portions of the focusing yarn and each core filament A contact member with a diameter of 20 to 35 mm at the tip of the loop formed by forming an independent radial loop of 11 to 14 mm in an unbounded state in the radial outward direction of the It is used by molding in a spiral shape (hereinafter, a contact material molded in a spiral shape is sometimes referred to as a contact material unit). By arranging the spiral contact members in such a structure, blockage due to excessive adhesion of microorganisms, which is one of the drawbacks of the conventional contact members, is prevented.

The present invention supports and uses a plurality of the above-described spiral contact member units in a frame made of a suitable corrosion resistant material. 3A and 3B show front and side views, respectively, with the contact member 15 held in a frame 16 made of a suitable corrosion resistant material. (d) is set to 35 mm or more as a space | interval at the tip of the loop of each contact material unit. In this invention, the structure which hold | maintained several contact material unit in the frame in this way is called a contact material module. The contact material module used in the present invention can be arbitrarily designed according to the manufacturing conditions such as the volume and depth of the aeration tank to be inserted. For example, in the case of a large installation, it can also manufacture every small block and assemble on site.

4 is a partial cross-sectional view showing a state in which four contact member modules are inserted into the aeration tank 5. (6) shows waste inlet and (7) shows treated water outlet.

This invention is used for the wastewater treatment method by a catalytic oxidation method. Although the aeration tank performing the catalytic oxidation can achieve the desired purpose even with one tank, the catalytic oxidation method is originally a continuous treatment, and since the raw water is continuously supplied, it is judged according to the conditions of the raw water concentration and the quality of the treated water, and so on. It is better to treat even aeration tank in multiple stages. That is, by dividing the aeration tank into multiple stages, microbial colonies suitable for the resin of each aeration tank work effectively, which is impossible for the concentration of raw water and can be up to about 2 to 5 ppm as necessary. In this way, in order to give a concentration gradient to each tank by dividing the aeration tank, it is necessary to completely distinguish each type, and design and arrange to block except the communication unit.

The configuration and effect of the present invention are discussed in comparison with the conventional method with reference to FIGS. 5, 6 and 7. 5A is a flow sheet of one example of the apparatus used in the conventional activated sludge process. FIG. 5B is a flow sheet of an example of an apparatus for implementing the conventional diffuser type method disclosed by the inventor in the foregoing application (Japanese Patent Application No. 59-107955). 5B shows a form in which the secondary treatment aeration tank is composed of four stages and the tertiary treatment aeration tank is composed of three stages. 5B shows a form in which the secondary treatment aeration tank is composed of four stages and the tertiary treatment aeration tank is composed of three stages. In FIG. 5, (6) is a wastewater supply line, (7) is a treatment water discharge line, (8) is an adjusting tank, (9a) is an aeration tank of the conventional method, and (9b) is a secondary treatment tank, ( 9c) shows a tertiary treatment tank, 10 a contact material module, 11 a compressor, 12 a sedimentation tank, 13 a dehydrator and 14 a incinerator. In the conventional activated sludge process, the pretreated wastewater is introduced into the adjusting tank 8 from the wastewater supply line 6, and then introduced into the aeration tank 9a and brought into contact with microorganisms grown and cultivated by the target wastewater in advance. After aeration for a predetermined time, the mixed liquid of the sludge and the treated water in the aeration tank is introduced into the sedimentation tank 12 silently by natural flow, where the mixed liquid is given an appropriate surface load, and the sludge is sedimented and separated. The supernatant (treated water) is usually discharged from the discharge line (7), while the sludge settled at the bottom of the settling tank is continuously conveyed by the line (17) to the aeration tank and mixed with the newly introduced wastewater. do. On the other hand, the excess sludge is dehydrated by the dehydrator 13 and incinerated in the incinerator 14 to be disposed of. On the other hand, the wastewater pretreated in the present invention is introduced into the adjusting tank 8 from the wastewater supply line 6 and then into the secondary treatment aeration tank 9b. The aeration tank 9b is divided into four tanks, and the contact material module of the shape and structure mentioned above is inserted in each tank. The volume of each group may be the same, and volume may change according to conditions.

The wastewater introduced into the aeration tank 9b is first aerated in Article 1 in contact with the microorganisms attached to the contact material and then aerated for a certain period of time, so that 40 to 60% of the BOD and COD components are removed. After that, the supernatant liquid (treatment water), which is sequentially transferred to Articles 2, 3 and 4 and finally freed of contaminants, is discharged from the line 7. On the other hand, depending on the type of wastewater, a part of the supernatant is introduced into the tertiary treatment tank 9c, and the supernatant liquid (treatment water) which is removed and rimmed by a mechanism such as the secondary treatment tank 9b is lined ( 7) discharged from.

The aeration method according to the present invention is not the conventional activated sludge method or the diffuser method, but the contact oxidation method performed by supplying a mixture of circulating water and air to the aeration tank under a high pressure in the aeration tank using a specific contact material in the present invention.

FIG. 6 and FIG. 7 are both the diffuser aeration method of the conventional method used in the contact oxidation method (biofilm method). The diffuser used in this case is cylindrical, flat or dome-like. It combines and sinters the fine particle of synthetic resin, and it performs an acidic radical by the injection of the air from the space | gap between particle | grains. In order to improve the dissolution efficiency of air, they are aiming for micropores. As the micropore diameter increases, the air permeation resistance increases, and conditions such as viscosity, density, surface tension, and injection pressure of waste water and air are applied to obtain microbubbles rather than phenomena. There is a problem, and moreover, the larger the pore diameter, the more likely the phenomenon of occlusion is obtained. Under such circumstances, in the case of the linear concentrated aeration of the non-contact material layer, the descending flow rate of the contact material portion is unexpectedly late, and it is easy to be settled to the rising flow rate. The sludge with the contact material near the flow stream is the result of trickling.

In addition, the front aeration has a drawback in that bubbles are easily formed due to the contact material being resisted, and a lot of peeling phenomenon occurs (a significant flow rate is required for the refinement of bubbles by repeated collision of rising bubbles. need).

In order to solve this problem, the present invention uses bubble precipitation by pressurized water. Pressurized water blows water and air into a closed tank under a pressure of about 5 kg / cm 2, stays for about 2 to 5 minutes, and circulates with a pump or the like to become a supersaturated state. When this is released into water under atmospheric pressure, bubbles are precipitated to obtain colloidal bubbles. By using this phenomenon, it is possible to continuously supply a sufficient oxygen supply and a gentle upward flow, and can completely prevent peeling in the case of performing a front aeration. At this time, the pressurized water outlet is so large that it is incomparable with the pore size of the diffuser.

8A is a schematic view of the longitudinal section of the aeration tank and the pressurized water device, in which 31 denotes an aeration tank and 32 a contact material module, and the treated water 33 purified in the aeration tank is discharged, and a part of the pump P _{1 is shown.} Is pressed through 35 through the ejector 34. The tank in (35) should be about 5 kg / cm 2. The negative pressure generated when water passes through (44) is automatically aspirated from (37) or blown by the compressor (36). The water stored in the tank of 35 is circulated by the pump 45 including the air sucked from the 32. At this time, the required residence time is circulated to make the oxygen dispersed state uniform, and is introduced into the aeration tank through the conduit of (40) through the pressure reducing valve (39) and discharged into the water from the discharge tube of (41). Here, when it returns to atmospheric pressure, saturated oxygen precipitates from pressurized water, becomes a micro bubble, and rises. The tank internal pressure of (35) is checked by the pressure gauge of (43), and excess air is exhausted through the degassing valve of (38). 8B is a partial plan view of the aeration tank. The dotted line shows the contact material filling section, and 41 shows an example of the assembly situation of the pressurized water discharge pipe.

9 is a plan view of the aeration tank, in which the treated water of (33) is sucked by a pump, exits the ejector 34 on the discharge side, and passes from the discharge pipe 41 of each aeration tank via the conduit of (40). Squirt. FIG. 9B shows an outline of the ejector. The water conveyed by the pump is discharged at a faster flow rate by tapering the tip of the 51. FIG. As water passes through the center of 52, the cavity of 53 becomes negative pressure and draws air from 54. As shown in FIG. The sucked air is dissolved and discharged under high pressure in contact with the circulating water when passing through the narrow portion of 52.

By spraying this water in water, fine bubbles are generated. Depending on the size of the aeration tank, an appropriate number may be used, or it may be arbitrarily assembled, such as assembling in the opposite direction in the aeration tank.

In the aeration method using an diffuser, the air discharged from the orifice rises in the liquid, ruptures to the surface, and dissipates into the atmosphere. Molecular diffusion is carried out through the gas film and the liquid film while the bubbles rise in the liquid velocity, and oxygen is supplied by filling the liquid surface layer with a bubble film saturated from turbulent diffusion due to the upstream or turbulence in the water surface. will be.

The size of the bubble leaving the diffuser is related to the diameter of the orifice and the amount of aeration. That is, the volume of the bubble is determined by the orifice diameter and the surface tension of the liquid, and this relationship is inversely proportional to the density of the liquid as a maintenance. The bubble rises away from the diffuser by the shear force with respect to the bubble from the orifice. At this time, when the amount of air is increased or when the rigid surface is buffered, a granulation phenomenon occurs in which bubbles are bonded. The bubble supplied in this way absorbs oxygen while raising the liquid velocity, and the oxygen concentration in a gaseous phase falls. When the bubble diameter at this time is small, the gas-liquid contact membrane is large, so that the supplied oxygen is used efficiently.

The bubble supplied by this invention mixes air in the liquid flow previously pressurized above atmospheric pressure, improves dissolution efficiency as a micro bubble, and discharges it to the liquid flow under atmospheric pressure. As a result, the dissolved oxygen precipitates as a pressure difference to form fine bubbles. The bubble diameter at this time is 30-120 micrometers, and becomes extremely fine. Therefore, air is mixed while pressurizing using the wastewater to be treated, and the stay of 3 to 5 minutes is maintained and supplied to each aeration tank. At this time, the preliminary oxidation proceeds by circulating in a saturated state under high pressure, and dispensing into an aeration tank enables more effective organic material treatment.

In the above, a comparison between the conventional activated sludge and the acid pipe method and the structural difference between the catalytic oxidation method of the present invention has been discussed. In summary, the sludge settled at the bottom of the settling tank, which is an essential operation in the conventional activated sludge method, is continuously returned to the aeration tank. In addition to the fact that the operation (return sludge) is unnecessary, the amount of excess sludge is reduced, the cleaning operation due to occlusion is unnecessary, and the intrinsic advantage of lighting that the aeration amount is minimal, the treatment tank becomes smaller, sedimentation tank and dehydrator , Structure, etc., such as the need for the installation of incinerators, etc. are unnecessary.

Next, an Example and a comparative example are given and this invention is demonstrated further more concretely.

Example 1, Comparative Example 1

Table 1 shows the results obtained by tertiary treatment of residential wastewater using the conventional apparatus shown in FIG. 5B and the apparatus of the present invention shown in FIG. 8A.

TABLE 1

As a result of Table 1, it was confirmed that the water circulated in the tank using the pressurized water tank is more effectively treated with raw water than in the case of the conventional diffuser system.

Table 2 shows the amount of biofilm deposited on the bottom of the biofilm deposited on the contact material and deposited on the bottom when the same drainage was aerated using a diffuser and a pressurized water tank, respectively.

TABLE 2

(Note) The biofilm amount is the value obtained by dividing the weight attached or falling by the total volume of the preceding roll.

As a result of this, the case where a pressurized water tank is used has less fall to a bottom part. Therefore, the frequency of cleaning the aeration tank, especially the discharge port of the pressurized water, is reduced at regular intervals.

Specifically illustrating the technical effects obtained in the present invention.

(1) All the microorganisms growing in the wastewater remain attached to the contact material, and suspended solids, which have been mixed and removed in the conventional sludge, are also attached and decomposed. Also, no sludge is required, and aerobic and anaerobic treatments are carried out continuously in the same microbial colony, so that the phenomena of the quenching process, which was a big problem for aerobic treatment with desorption liquid in the anaerobic treatment by the active sludge method of the conventional method, It does not occur at all, and there is no need to worry about disassembly by overaeration, and it can be operated freely.

(2) The treatment efficiency is high compared to the activated sludge of the conventional method, so that the treatment tank may be small, and the sedimentation separation tank, the sludge production, the sludge concentration tank, the dehydrator, etc. are unnecessary, which is suitable for improving the facilities lacking in the installed capacity. .

(3) When the aeration tank has a multi-stage structure, the concentration gradient of each tank can be considered, and various types of microorganisms can be attached and multiplied by each tank, so that the treatment of inflow water, temperature, and water quality is superior to the conventional method. There is ability.

(4) Since self-regulation of the coagulation action by the excretion of various microorganisms is expected, the high concentration wastewater of several thousand ppm can be treated to 10 ppm or less.

(5) The aeration of the activated sludge of the conventional method was performed solely for the purpose of supplying oxygen (DO) in water consumed by microorganisms and the like, and flowing the sewage to effect contact with the attached bacteria. The main focus is to adjust the amount of oxygen, i.e., dissolved oxygen, of the bacteria (aerobic) on the surface attached to the contact material and the anaerobic bacteria issued to the center. The pressurized water air precipitation method is adopted for oxygen supply and agitation to increase the efficiency, and the amount of air at the time of operation is minimal.

(6) In the active sludge of the conventional method, even for difficult-decomposed organic substrates that require long-term retention, they are efficiently decomposed by the microbial colony attached to the contact material, so that the treatment time can be shortened (small aeration tank). have.

(7) Compared with the contact oxidation method by the acid engine method of the conventional method, since microbubbles are obtained, the dissolution efficiency of air becomes high and sludge treatment is performed efficiently. In addition, in the diffuser system, the diameter of the bubble discharge port must be made small in order to obtain fine bubbles, and as a result, there is a drawback of the blockage of the discharge port. In contrast, in the present invention, it is not necessary to reduce the diameter of the bubble discharge port, and the problem of blockage does not occur.

(8) Compared with the diffuser system of the conventional method, the amount of biofilm falling on the bottom of the operation is small. Therefore, the frequency of regularly cleaning the outlet of the pressurized water, especially in the tank, is also reduced.

(9) Nitrogen and denitrification bacteria can be proliferated actively. In the future, even when the regulation of nitrogen and phosphorus is enacted, it is possible to cope by appropriately dividing the concentration gradient.

(10) Even when there is a prolonged holiday such as a school, the deactivation of microorganisms is small, no problem occurs during long power outages, and the time for returning to a stable phase by reaeration is shortened.

Claims (13)

(A) A device for pretreatment of wastewater to be treated, and (B) Aeration tank for aeration mixing while contacting the pretreated wastewater with microorganisms, and wastewater treatment for treating wastewater by introducing circulating water and air into the aeration tank. An apparatus comprising: a plurality of non-combustible yarns and non-combustible filaments arranged so as to cross each other in a peripheral inclination direction of a flexible plastic pipe through which a core wire is inserted into this aeration tank, and the filaments are drawn out between the wound portions of the bundled yarns to each filament. A waste water characterized by inserting a structure made of a contact material formed by forming radially independent independent radial loops in radially radial direction of the flexible plastic pipe, and supplying a mixture of the circulating water and the air into the aeration tank under high pressure. Processing unit. The wastewater treatment apparatus according to claim 1, wherein the aeration tank is a multi-tank structure. The wastewater treatment apparatus according to claim 1, wherein the input of the circulating water and the air is 5-10 kg / cm 2. The wastewater treatment apparatus according to claim 1, wherein the circulating water and the air are held at a high pressure by a compressor or a pressurized water tank. The wastewater treatment apparatus according to claim 1, wherein the circulating water and the air are supplied at a high pressure by a pump or an ejector. The wastewater treatment apparatus according to claim 1, wherein the core wire is made of a rigid core material. The wastewater treatment apparatus according to claim 6, wherein the rigid core material is an aluminum alloy. The wastewater treatment apparatus according to claim 6, wherein an inner diameter of the pipe is approximately equal to an outer diameter of the rigid core material. The wastewater treatment apparatus according to claim 6, wherein the pipe has a thickness of 0.5 mm to 1 mm. The wastewater treatment apparatus according to claim 6, wherein the diameter of the rigid core material is 3 mm to 5 mm. The wastewater treatment apparatus according to claim 1, wherein the diameter of the wound portion is 20 mm to 35 mm. The wastewater treatment apparatus according to claim 1, wherein the nonflammable filament is a nonflammable polyvinylidene chloride filament. The wastewater treatment apparatus according to claim 1, wherein the contact member is formed in a spiral shape.

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