KR200258319Y1 - Sewage and wastewater treatment system - Google Patents

Abstract

Anaerobic tank for introducing wastewater into the wastewater and inducing dephosphorization of microorganisms; By providing a first stirring means for mixing and stirring the water body introduced from the anaerobic tank and aeration means for supplying dissolved oxygen to the water body to induce nitrification, denitrification and excess phosphorus intake of the microorganisms and a second biological reaction tank in which a circulation flow path is formed In the wastewater treatment system for discharging the treated water, including: The anaerobic tank 100, the first wall 101 for storing the water body, and the tubular shape of the lower portion is opened in the first wall 101. The lower partition 112 and the centrifugal stirrer 103 for mixing and stirring water bodies so that water flow is formed from the inside of the lower partition 112 to the outside are provided. Accordingly, the required site area can be reduced, and facility and maintenance costs can be reduced.

Description

Sewage and wastewater treatment system

The present invention relates to a wastewater treatment system, and more particularly to a wastewater treatment system using a biological reactor.

Contaminants in sewage water include organic matter expressed in biological oxygen demand (BOD) and nutrients such as nitrogen and phosphorus. As a method of treating such organic matter and nutrients, there are physical, chemical, or biological treatment methods depending on the treatment method.

The biological treatment method is a method of removing organic matter and nutrients from the sewage water using metabolic action of microorganisms.

Nitrifying microorganisms, such as Nitrosomonas and Nitrovector, ingest inorganic carbon as a nutrient in aerobic conditions with dissolved oxygen (DO), and use ammonia nitrogen (NO2-N) in wastewater. Or nitric acid (NO3-N), and denitrifying microorganisms (e.g., Pseudomonas, Bacillus, Micrococcus, etc.) ingest organic carbon as an nutrient source in anoxic conditions without dissolved oxygen. Is reduced to nitrogen gas using an electron acceptor (denitrification reaction). According to this process, nitrogen contained in the wastewater is removed by being released into the atmosphere in the form of nitrogen gas.

And, dephosphorous microorganisms such as Acinetobacter release phosphorus in cells while absorbing organic acid such as acetic acid in the body under anaerobic conditions, and dry weight of cells normally having in the cells by using the absorbed organic acid as a nutrient source. Consume 4-7% more phosphorus than 1-2% of phosphorus. The sludge containing the phosphorus-removing microorganisms that are excessively ingesting phosphorus is discharged to the outside as waste sludge and disposed of to remove the phosphorus contained in the wastewater.

In order to biologically remove organic matter, nitrogen and phosphorus from sewage water using the metabolism of these microorganisms, a biological reaction tank having a microbial mass called activated sludge and a sedimentation tank for separating sludge and supernatant are required.

However, in the conventional biological sewage treatment system, a plurality of anaerobic tanks, anoxic tanks, aerobic tanks, and the like are separately separated and fixed as a biological reactor, and methanol is fixed for denitrification of nitric acid (NO3-N). In order to supply the electron donor or use organic matter in the sewage, the reaction solution of the nitrification tank had to be circulated internally to the denitrification reactor. However, since the reactor is separated and fixedly installed at a fixed capacity, it is not possible to flexibly cope with changes in the inflow water quality and the inflow flow rate.Injecting methanol requires excessive chemical costs, and the internal circulation flow rate to use the inflow organic matter is Two to four times the processing flow required excessive pumping, power and facility management costs.

In order to solve this problem, an intermittent aeration method or a flow path changing method for intermittently supplying air to the inside of the reactor to repeat the anaerobic and aerobic conditions in the biological reactor has been proposed, and the biodenipho process is a representative conventional technology. System, Phased Isolation Ditch (PID) process system.

The PID process, developed by Kröre, Denmark, combines two or more reactors with an external sedimentation basin to remove nitrogen and phosphorus from wastewater by biologically changing and intermittent aeration.

According to the sewage treatment system used in the PID method, the first set of four reactors, two or more sets of second reactors, and an external sedimentation basin equipped with a sludge collection device, and an external sedimentation basin are used for inducing wastewater and inducing phosphorus discharge. A sludge conveying pipe and a sludge conveying pump for conveying the concentrated sludge to the first reactor are provided. Here, each of the first reactors is provided with a stirrer and induces dephosphorization by mixing and stirring the returned sludge and the influent sewage water, and the two second reactors have a structure for treating the sewage water due to the flow path change and the intermittent aeration.

However, even in such a wastewater treatment system, the facility and operation thereof are complicated, excessive facility costs, power costs, and maintenance costs are required, and it is unreasonable to be applied to domestic small and medium scale wastewater treatment systems.

In particular, in the case of small and medium sized sewage treatment plants in domestic villages, organic matter load and flow rate change significantly according to the season and monthly time, and under these circumstances, safety and safety are considered in laboratory or pilot experiments in which a constant flow rate and load are always given. By design, it is designed and constructed at 1.5 times the average flow rate, but in practice it is common that the maximum load exceeds 2-3 times. Moreover, the existing biological reactors are fixed in a given condition (retention time, volume, etc.), so that if the site manager is not resident due to the condition of small and medium sewage treatment plant, especially if the flow rate is concentrated during the summer or weekend, It is not enough to handle.

The present invention has been made to solve such a problem, the object of the present invention is to provide a wastewater treatment apparatus that can reduce the facility cost and maintenance costs.

In addition, another object of the present invention is to provide a wastewater treatment apparatus capable of actively and actively responding to changes in external conditions such as changes in flow rate of a wastewater or impact load.

1 is a schematic diagram of a wastewater treatment system as an embodiment according to the present invention,

Figure 2 is a plan view of an oil reactor as an example that can be used in the wastewater treatment apparatus of Figure 1,

3A and 3B show a line header of the stirring means as an example that can be used in the wastewater treatment apparatus of FIG. 1, FIG. 3A is a front view of the line header, and FIG. 3B is taken along the line II-II of FIG. 3A. Is a cross section of the line header,

4 is a schematic cross-sectional view of the settling tank and the stirring means along line I-I of FIG.

FIG. 5 is a sectional view of the supernatant outflow device in which the portion A in FIG. 4 is enlarged

6 is a schematic diagram of a wastewater treatment system having a sedimentation basin as a modification of the wastewater treatment apparatus according to the present invention.

<Description of Signs of Major Parts of Drawings>

100. Anaerobic tank 103. Agitator

112. Cylindrical downward bulkheads 200, 400. Cylindrical reactor

241. Submersible Pumps 243. Line Headers

260, 460. Sedimentation tanks 268. Upflow inlet flow paths

267a. Sludge Outlet 267b. Sludge Reactor Tank

267c. Sludge anaerobic tank return pipe 300. Supernatant outflow device

310. Float 321. Fallopian tube

323. Lower tube 340. Corrugated tube

500. External settling tank

As an embodiment according to an aspect of the present invention for achieving the above object, the first biological reactor for introducing wastewater and dephosphorization of microorganisms; A second stirring means for mixing and stirring water bodies introduced from the first biological reaction tank and aeration means for supplying dissolved oxygen to the water bodies to induce nitrification, denitrification and excess phosphorus intake of microorganisms, and a second circulation path is formed; In a sewage water treatment system for discharging treated water, including a biological reactor:

The first biological reaction tank is a mixture of the first wall for storing the water body, the cylindrical lower partition having a lower opening in the inside of the first wall, and the water body so that water flow is formed from the inside of the lower partition to the outside. It provides a wastewater treatment system comprising a second stirring means for.

Here, the inner surface of the wall and the lower partition wall has a cylindrical shape,

It is preferable that the said 2nd stirring means is a centrifugal-flow stirrer located in the center lower part of the said lower partition.

The second biological reaction tank has a sedimentation tank which is built in such a way that the circulating water flows in the lower portion, and the sedimentation tank is connected to a floater so as to be floated according to a change in inflow quantity, and a supernatant inflow hole is formed. It provides a sewage water treatment system having a supernatant water outlet device comprising a first pipe and a second pipe connected to the first pipe to discharge the supernatant water introduced through the supernatant inlet to the outside.

Here, the first tube, it is preferable that the floating tube is attached to the fallopian tube formed with the upper water inlet and the lower tube made of a material having a specific gravity greater than the fallopian tube.

In addition, the first tube is formed with a side protrusion, the end of the second tube is preferably formed with a guide for guiding the movement of the side protrusion, and a stopper for limiting the movement of the side protrusion. .

Furthermore, the supernatant outflow device is preferably further provided with a corrugated pipe for preventing the water of the sedimentation tank from flowing between the first pipe and the second pipe.

In addition, the corrugated pipe is preferably made of a tarpaulin in which a circular or coil-shaped core wire is disposed to resist shear deformation.

The first stirring means may include a submersible pump, a line header having a plurality of feed water outlets for ejecting the water body pumped from the submersible pump along a circulation flow path, and a pressurized water pipe connecting the submersible pump and the line header. Include.

Here, the pressure water pipe is disposed extending to the water surface, and may be provided with a pressure gauge and a water pressure control valve for controlling the flow rate of the water pressure.

The line header is preferably disposed below the second biological reactor as a cylindrical chamber extending a predetermined length in the width direction of the circulation passage.

Further, it is preferable that the pressurized water outlet is a through hole inclined downward in the flow direction of the water flow.

Preferably, the settling tank has a wall on which an upflow inlet flow path can be formed, and the first sludge conveying pipe and the first sludge conveying pipe for conveying the settled sludge into the second biological reactor. It is preferable to provide a 2nd sludge conveying pipe branched in the middle part of the said 1st sludge conveying pipe so that a part of sludge passing through may be conveyed to the said 1st biological reaction tank.

As another modification according to the present invention, further provided with an external sedimentation basin, the lower portion of the settling tank is formed with a sludge discharge port that can be returned to the inside of the second biological reactor, the second pipe is the outer tube It provides a sewage treatment system, characterized in that connected to the discharge of the supernatant to the sedimentation basin.

Hereinafter, with reference to the accompanying drawings will be described in more detail the wastewater treatment system according to the present invention.

1 schematically shows an apparatus of a wastewater treatment system as an embodiment according to the present invention.

Referring to Figure 1, the wastewater treatment system as an example according to the present invention, the wastewater is introduced into the anaerobic tank 100 and in order to induce phosphorus (P) release of dephosphorus microorganisms under anaerobic conditions, from the anaerobic tank (100) One batch reactor 200 is provided as a biological reactor in which organic matter is removed from the introduced water and nitrification, denitrification, and excessive intake of phosphorus may occur. Here, the illustrated reaction oil reactor 200 is illustrated in a cross-sectional view of the structural units disposed in the processing step inside the reaction vessel 200 for convenience of description and understanding. Let's explain. The anaerobic tank 100 and the batch reactor 200 each show an example of a biological reactor, and the water body of the reactor refers to a solid suspension in which sludge and wastewater containing dephosphorization, denitrification, or nitrifying microorganisms are mixed. .

The anaerobic tank 100 includes a wall 101 for storing a suspension, that is, a sludge mixed with the introduced sludge, which is described later, a water body, a compartment 110 having an open lower portion inside the wall, and an inside of the compartment. Stirring means for mixing and stirring the water body so as to form the water flow 105 to the outside.

The compartment 110 may be, for example, a cylinder having a lower opening, preferably a cylindrical lower partition, and the stirring means is a centrifugal flow type agitator 103 positioned below the center of the lower partition 112. Do.

Here, reference numeral '102', which is not described, shows a driving motor for driving the centrifugal stirrer 103, and reference numeral '20' denotes an inlet pipe for introducing the wastewater from the inside and the outside of the compartment 110 to the outside. The reference numerals '31' and '32' show the conveying pumps and the conveying pipes connected to allow the sludge concentrated in the sedimentation tank 250 to be conveyed into the compartment 110.

According to the configuration of the anaerobic tank 100, the wastewater and the conveying sludge introduced into the compartment 110 through the conveying pipe 32 and the inlet pipe 20 are mixed and agitated by the stirrer 103 and contained in the conveying sludge. The combined oxygen of NO 2 or NO 3, which is a phosphorus release inhibiting substance, is completely removed in the compartment 110 by denitrifying microorganisms in the sludge. Then, the water body in the compartment 110 is smoothly moved out of the compartment 110 in the anaerobic tank 100 through the opening of the cylindrical lower partition 112 by a centrifugal flow type agitator 103 located at the bottom bottom of the center 110. It will flow (see arrow 105). Since the water body moved out of the compartment 110 is under a state in which phosphorus release inhibitors, that is, NO 2 or combined oxygen of NO 3 have already been removed, phosphorus release of dephosphorized microorganisms contained in the water body outside the compartment 100 in the anaerobic tank 100 is effectively performed. It can be done. The water body containing the phosphorus-release dephosphorized microorganism is supplied to the oil reactor 200 through the outlet 122 and the outlet pipe 120 of the anaerobic tank 100. Accordingly, dephosphorus microorganisms released from phosphorus outside the compartment 110 in the anaerobic tank 100 are introduced into the batch reactor 200 and promote excess phosphorus intake of dephosphorus microorganisms under aerobic conditions due to aeration of the aeration means 250 described below. And facilitates the removal of phosphorus from sewage water.

As such, by providing one biological reactor, that is, a compartment consisting of one cylindrical lower partition wall 120 that is simply integrated in the anaerobic tank 100 and a centrifugal flow stirrer 103 at the bottom thereof, phosphorus release of dephosphorized microorganisms is possible effectively. In this way, it is possible to promote the excess of excess phosphorus and phosphorus removal according to the aerobic conditions of the after-treatment, that is, the batch reactor, and at the same time, it is possible to provide a simpler, more economical and compact wastewater treatment system than the existing system.

Figure 2 schematically shows a planar state of a rectangular oil reactor as an example that can be used in the wastewater treatment apparatus according to the present invention, Figures 3a and 3b is a front view and a cross-sectional view of the line header as a stirring means 4 is a schematic cross-sectional view of the sedimentation tank and the stirring means along the line II of FIG. 2, and FIG. 5 is an enlarged view of a portion A of FIG.

Referring to FIGS. 1 and 2, the oil reactor 200 includes stirring means 240 and 270 for mixing and stirring water bodies introduced from the anaerobic tank 100, aeration means 250 for supplying oxygen to the water bodies; The lower part is provided with a settling tank 260 so that the circulation water flows.

As an example, an elliptical circulation passage is formed in the circulation reactor 200 to allow the introduced water body to be circulated.

The aeration means 250 supplies or stops oxygen in the reaction tank 200 by an intermittent aeration method or the like to make the inside of the reaction tank 200 an aerobic or anoxic condition or the like, and thus nitrification and excess absorption of microorganisms, decomposition of organic matter, or For contributing to denitrification, for example, a blower 51, an air supply pipe 52, and an diffuser 251 are included.

The stirring means (240, 270) shows a state in which two are arranged on both sides with a central partition (210) therebetween as an example for the mixing and stirring of the water body and the formation of smooth circulation water flow, and the water body at the bottom of the reaction tank 200 See a plurality of pumped water outlets 243b (FIGS. 3A and 3B) for ejecting the suction pump and the water pump pumped from the submersible pump 241 along the circulation flow path at the bottom of the reaction tank 200. A line header 243 formed therein, and a pressure feed pipe 245 connecting the submersible pump 241 and the line header 243. Here, the pressure feed pipe 245 extends to the upper surface of the water surface of the reaction tank 200, and is provided with a pressure gauge 247 and a pressure feed control valve 249 for controlling the flow rate of the pressure feed water in a pipe portion of the upper surface of the water. Preferably, in this case, the manager can check the flow rate of the pressurized water fed by the submersible pump 241 and operate the pressurized water control valve 249 manually.

3A and 3B, the line header 243 is a cylindrical chamber having a predetermined length, and has a pressure feed inlet 243a and a pressure feed outlet 243b, and a width of the circulation flow path of the reaction tank 200. That is, the pressurized water supplied through the pressurized water inlet 243a between the central partition wall 210 and the inner wall 220 is temporarily stored in the space in the chamber and then ejected to the lower portion of the reactor 200 through the pressurized water outlet 243b. .

The pressurized water outlet 243b may have various shapes so that the pressurized water may be discharged evenly. As an example, a plurality of slit-shaped openings are formed to be spaced apart from each other by a predetermined interval in the width direction of the reaction tank 200. It is preferable to secure, and each pressurized water outlet 243b is preferably formed in the through hole through which the pressurized water in the chamber can be inclined downwardly (for example, 45 °) in the direction of water flow.

According to the configuration of the stirring means 240 and 270, the water body of the bottom portion of the reaction vessel 200 is sucked up by the submersible pump 241 located at the bottom portion of the reaction vessel 200, and the line header 243 is located at the bottom portion of the reaction vessel again. Sludge is effectively suspended in the water without being deposited on the bottom of the reaction tank 200 by being inclined downward from the bottom of the reaction tank 200 through the pumped water outlet 243b of the central tank 210 and the inner wall of the reactor 220 As the water is ejected through the pressurized water outlet 243b or the plurality of slit-shaped openings of the line header 243 disposed in the width direction between the water bodies, the water body forms a constant circulating water flow along the circulation flow path of the oil reactor 200. . In addition, since the line header 243 is installed close to the bottom, the flow rate of the water body at the bottom of the reactor 200 becomes relatively large, but the flow rate of the water body near the water surface is relatively small, which causes severe stirring of the upper and lower layers. There is an advantage in minimizing the melting of oxygen in the atmosphere because it does not. In addition, it is possible to provide an efficient and more economical wastewater treatment system using a general submersible motor and simple piping work. Furthermore, in the reaction tank, the circulation flow path is suddenly changed, for example, referring to FIG. 2, at both ends of the central partition 210, sludge is deposited and decayed due to water flow, and dead space is generated to reduce odor and reduce treatment efficiency. However, the deposition phenomenon in the dead space can be reduced according to the line header 243 according to the present invention. Here, the reference numeral '230', which is not described, illustrates a guide partition wall for reducing the distribution of the non-uniform flow velocity of the water flow in the curved portion 221, and when the guide partition wall is disposed on the curved portion 221, the line header 243 is used. And more effectively reduce deposition on dead spaces.

Referring to FIGS. 2 and 4, the settling tank 260 includes walls 261 and 265 which form an upflow inflow passage 268 so that the water body of the reaction tank 200 can be introduced therein, and the sludge therein. And a wall 261, 262, and 264 forming a space for sedimentation and separation of the supernatant, and a supernatant outlet 300 for discharging the supernatant to the outside.

The upflow inflow passage 268 may be formed by, for example, a lower partition wall 265 having a lower portion separated from the settling tank front wall 261 and the settling tank front wall 261 by a lower portion, and at this time, The front wall 261 and the lower partition wall 265 may be fixed to the central partition 210 and the inner wall 220 of the reactor 200.

The flow velocity of the water flow introduced into the sedimentation tank 250 is reduced by the downward partition wall, and the vortex of the reaction vessel 200 can be prevented from propagating into the sedimentation tank, so that the sedimentation efficiency in the sedimentation tank 250 is increased. There is an advantage to be improved.

The inner space of the settling tank is formed of the settling tank front wall 261, the settling tank rear wall 262 arranged at a predetermined interval from the settling tank front wall 261, and the settling tank front wall 261 and the settling tank rear wall 262. It is formed by the sludge hopper 264 extending inclined at a predetermined angle from the lower end. Here, the inclined plate 263 may be installed in the settling tank 260 to minimize the volume of the settling tank and improve the settling efficiency.

The sludge hopper 264 has a funnel or inverted triangular pyramid shape, and a sludge discharge port 267a is formed at a lower portion of the sludge hopper so that the settled sludge can be easily discharged and conveyed into the reactor. The sludge outlet 267a has a relatively large discharge area so that the lower part of the sludge hopper 264 is opened, so that the sludge settled in the settling tank 260 can be easily conveyed into the reaction tank 200. desirable.

The settling tank 260 described above may be used in a sewage treatment system having an external settling tank as shown in FIG. 6, which will be described later with reference to FIG. 6, and in the settling tank shown in FIGS. 2 and 4. It will be described that it can be used as a built-in precipitation tank.

The sludge discharge port 267a of the settling tank 260 is connected to the sludge conveying pipe 32 so that the settled concentrated sludge can be conveyed to the anaerobic tank 100.

At this time, the concentrated sludge is returned to the anaerobic tank 100 or discharged as excess sludge, and at the same time, the settled sludge can be quickly discharged into the petroleum reactor 200, the sludge outlet 267a in the water flow direction Sludge branched from the middle portion of the sludge reactor tank return pipe 267b so that a portion of the sludge passing through the sludge reactor tank return pipe 267b and the sludge reactor tank return pipe 267b can be returned to the anaerobic tank 100. It is preferable to provide the anaerobic tank return pipe 267c. Here, the sludge anaerobic tank conveying pipe 267c is connected to the sludge conveying pipe 32 for conveying sludge into the compartment 112 of the anaerobic tank 100.

According to the configuration of the sedimentation tank 260, the water body introduced through the upflow inflow passage 267 is gravity sedimentation in the sedimentation tank 260 or deposited and sedimented on the inclined plate 263 to the sludge hopper 264 Will fall. Since the sludge concentrated and dropped can be discharged and conveyed into the reaction tank 200 more quickly and easily by the sludge discharge port and the sludge conveying pipes 267b and 267c, the sludge conveyance efficiency in the oil reaction tank 200 is increased. As a result, problems such as sludge rising due to sludge accumulation are eliminated, and the residence time of the concentrated sludge in the sedimentation tank 260 is also shortened, so that the state in the reaction tank 200 is faster than that in the aerobic, anaerobic, or anaerobic condition. It will be able to adapt and respond more quickly to changes in inflow conditions of water streams entering the sewage treatment plant.

The supernatant from which the sludge is settled from the body is discharged to the outside through the supernatant outflow device 300 adjacent to the rear wall 262 of the settling tank.

Referring to FIG. 5, the supernatant outlet device 300 includes a floater 310 and a floater 310 attached to an outer circumferential portion of the supernatant so that the supernatant flows to the outside so that the floater 310 may flow and float in accordance with a change in inflow water amount. The first pipe 320 formed with the supernatant inlet 321a to be discharged, and the second pipe connected to the first tube 320 to discharge the supernatant introduced through the supernatant inlet 321a to the outside. 330 and a corrugated pipe 340 to prevent the water body of the settling tank 260 from flowing between the first pipe 320 and the second pipe 330.

The first tube 320 is preferably made of a fallopian tube 321 of a material such as plastic, PP or PE, and a lower tube 323 of a metal material attached to the lower end of the fallopian tube 321. Accordingly, due to the buoyancy of the floater 310 and the specific gravity difference between the fallopian tube 321 and the lower tube 323, the first tube 320 can respond more sensitively to the water level variation of the settling tank. Here, the floater 310 is attached to the outer peripheral portion of the upper end of the fallopian tube 321 with sufficient buoyancy, the supernatant inlet 321a is a circle of the fallopian tube 321 adjacent to the water surface so that the supernatant can flow out uniformly. It is preferable to have a plurality of slit-shaped through holes evenly spaced along the main part.

In addition, a side protrusion 323a is formed at the lower tube 323 of the first pipe 320, and a guide part for guiding the movement of the side protrusion 323a at an end of the second pipe 330. 330a and stop jaws 330b and 330c for limiting movement of the lateral protrusions are preferably formed. Here, the second pipe 330 is fixed to the settling tank rear wall 262.

One end of the corrugated pipe 340 is attached to the lower tube 323 by a tie or clamp 350 and the other end is attached to the second tube 330. The corrugated pipe 340 may be a superimposed of a circular corrugated tarpaulin, it is preferable to arrange a circular or coil-shaped iron core (341) in order to avoid shear deformation due to water pressure.

By the oil reaction reactor 200 having such a supernatant outflow device 300, the supernatant from which sludge is separated from the water can be discharged to the outside uniformly through the supernatant inlet 321a, although the inflow quantity and water level Even though the first pipe 320 is fluctuated, the first pipe 320 can be discharged to the outside by constantly flowing only the supernatant water adjacent to the water surface in response to the change in water level. Therefore, even when there is an increase or decrease of the wastewater flowing in the septic tank 200, the wastewater can be effectively treated and discharged according to the microorganisms in the reaction tank 200 while discharging only a predetermined amount of the supernatant to the outside.

For example, if the inflow flow rate is the average flow rate (Q) and the design residence time of the oil reactor 200 is 12 hours at this time, the flow rate at this time is also Q, even when the inflow flow rate is increased to 2Q. Irrespective of the increase in flow rate by the supernatant treatment apparatus 300, the constant Q flows out to Q, and the excess Q in the inflow flow rate raises the water level in the oil reactor 200. Therefore, the residence time of the reaction tank 200 is maintained constant as 12 hours even though the inflow flow rate is doubled to ensure a sufficient reaction time. At this time, the microbial suspension concentration according to the inflow flow rate is increased as the sludge sludge is quickly returned to the inside of the reaction tank 200 by gravity sedimentation as described with reference to FIG. The processing can be made smoothly.

In addition, since the oil reaction tank 200 can respond more flexibly as the capacity increase by the depth rather than the area even when the flow rate changes, the volume of the flow adjusting tank for the buffering action can be reduced, so that the overall wastewater treatment system becomes more compact.

As described above, the present invention has been described as an example of an oil recycling reactor having a sedimentation tank or a built-in sedimentation tank and a sewage treatment system having the same, but the reaction oil reactor according to the present invention has an external sedimentation tank. It can also be used for sewage treatment.

That is, since the reactor requires an appropriate required volume determined by the hydraulic retention time, and the sedimentation basin must have a minimum surface area by the surface area loading rate, when the built-in sedimentation tank is provided, the reactor capacity is encroached by the sedimentation tank. Will be. In order to minimize the erosion of the reactor capacity, a sedimentation tank having a minimum surface cross-sectional area that can cope with variations in the inflow flow rate may be installed in the reaction tank, and a separate external sedimentation basin may be installed outside the reactor to discharge the supernatant to the outside.

6 is a variation of the wastewater treatment apparatus according to the present invention, and shows a wastewater treatment system having an external sedimentation basin. Here, the same reference numerals as the above-described reference numerals refer to the same members having the same functions.

Referring to FIG. 6, the sludge conveyance in the reaction tank 400 is conveyed through the sludge reaction tank conveying pipe 267b formed in the water flow direction under the sludge hopper 264 of the sedimentation tank 460, and is conveyed to the anaerobic tank 100 and the like. The sludge which is to be conveyed is conveyed through the conveying pump 31 and the conveying pipe 32 from the sludge separated from the solid solution in the settling tank 500. Here, the external sedimentation tank 500 can be used without limitation as long as it can be easily obtained in the art, such as a circular sedimentation tank and its detailed description will be omitted.

In the case of using such a built-in sedimentation tank and an external sedimentation tank, as described with reference to FIGS. 4 and 5, not only can actively respond to changes in the inflow conditions of wastewater in the petrol reactor 400, Since the supernatant separated from the water body is nutrient-divided, the capacity of the external sedimentation tank 500 installed on the outside of the oil reactor 400 may be relatively reduced. For example, maintaining the microbial concentration in the batch reactor 400 to 5000mg / L, and the sedimentation tank (500) to return to the batch reactor (400) by gravity sedimentation of 2500mg / L of 50% in the built-in sedimentation basin (460) Sludge load of 50% can be reduced to form a more compact external sedimentation tank 500, so that the internal sedimentation tank 460 is sufficient if the residence time is enough to maintain the concentration of the microbial suspension to about half The volume occupied by the built-in sedimentation tank 460 in the oil reactor 400 may also be reduced.

According to the wastewater treatment apparatus according to the present invention, a more compact and economical wastewater treatment system by having one biological reactor, that is, one cylindrical downward bulkhead integrated in the anaerobic tank, or an oil reactor that buffers the change of inflow conditions, etc. It can be used efficiently in small and medium sized sewage treatment plants in villages.

Claims (14)

A first biological reactor for introducing wastewater and inducing dephosphorization of microorganisms; A second stirring means for mixing and stirring water bodies introduced from the first biological reaction tank and aeration means for supplying dissolved oxygen to the water bodies to induce nitrification, denitrification and excess phosphorus intake of microorganisms, and a second circulation path is formed; In a sewage water treatment system for discharging treated water, including a biological reactor: The first biological reaction tank is a mixture of a first wall for storing the water body, a cylindrical lower partition having a lower opening inside the first wall, and a water body to form a water flow from the inside of the lower partition to the outside. Wastewater treatment system comprising a second stirring means for. The method of claim 1, The wall inner surface and the lower partition wall has a cylindrical shape, The second stirring means is a wastewater treatment system, characterized in that the centrifugal flow type stirrer located in the lower center of the lower partition. The method of claim 1, The second biological reactor is; It has a built-in sedimentation tank so that the circulating water flows in the lower part, The settling tank is; A floater, a first pipe connected to the floater so as to be floated according to a change in the inflow amount, and a second pipe connected to the first pipe to discharge the supernatant introduced through the supernatant inlet to the outside. Sewage water treatment system comprising a supernatant outflow device comprising a pipe. The method of claim 3, wherein The first tube is; Wastewater treatment system characterized in that the float is attached to the fallopian tube formed with the upper water inlet hole, the lower tube of the material attached to the lower end of the fallopian tube is greater in specific gravity. The method of claim 3, wherein The first pipe is formed with a side protrusion, Guide portion for guiding the movement of the lateral projections, and a stopper for limiting the movement of the lateral projections are formed at the end of the second pipe, sewage treatment system. The method of claim 3, wherein The supernatant outflow device, Sewage water treatment system further comprises a corrugated pipe for preventing the water of the sedimentation tank flows between the first pipe and the second pipe. The method of claim 6, The corrugated pipe is sewage treatment system, characterized in that made of a tarpaulin arranged in a circular or coil-shaped core wire to resist shear deformation. The method of claim 3, wherein The first stirring means, Sewage water comprising a submersible pump, a line header having a plurality of feed water outlets for ejecting the water body pumped from the submersible pump along a circulation flow path, and a pressurized water pipe connecting the submersible pump and the line header. Processing system. The method of claim 8, The pressurized water pipe is disposed extending to the water surface, and has a manometer and a pressurized water control valve to control the flow rate of the pressurized water. The method of claim 8, The line header is a wastewater treatment system, characterized in that disposed in the lower portion of the second biological reactor as a cylindrical chamber extending a predetermined length in the width direction of the circulation passage. The method of claim 10, The pressurized water outlet is a wastewater treatment system, characterized in that the through-hole inclined downward in the flow direction of the water flow. The method of claim 3, The sedimentation tank is a wastewater treatment system, characterized in that it comprises a wall on which the upflow inlet flow passage can be formed. The method according to any one of claims 3 to 12, The sedimentation tank may include a first sludge conveying tube for conveying the settled sludge into the second biological reactor and a portion of the sludge passing through the first sludge conveying tube may be conveyed to the first biological reaction vessel. And a second sludge conveying pipe branched at an intermediate portion of the first sludge conveying pipe. The method according to any one of claims 3 to 12, It is further provided with an external settler, The lower part of the sedimentation tank is formed with a sludge discharge port through which the settled sludge can be transported into the second biological reactor, The second pipe is sewage treatment system, characterized in that connected to the external sedimentation basin so that the supernatant can be discharged.