KR102031866B1 - Oxic zone control type activated sludge process wastewater treatment facility and its operation method - Google Patents

Abstract

The present invention relates to sewage and wastewater treatment utilizing activated sludge. By controlling an aerobic zone in an aeration tank (10) without a partition wall dividing the aeration tank (10) by adjusting dissolved oxygen and sludge return rate, which are important factors in the sewage and wastewater treatment, the operational stability of the sewage and wastewater treatment facility is maintained and the treatment capacity can be adjusted. Through the present invention, treatment efficiency and breakthrough energy saving can be secured only by optimizing an operation method of the aeration tank (10) without significant change or chemical input to the activated sludge sewage and wastewater treatment facility structure such as a movable partition wall configuration.

Description

Operational Sewage and Wastewater Treatment Facility and Operation Method {OXIC ZONE CONTROL TYPE ACTIVATED SLUDGE PROCESS WASTEWATER TREATMENT FACILITY AND ITS OPERATION METHOD}

The present invention relates to sewage and wastewater treatment utilizing activated sludge, and aerobic in the aeration tank 10 without the partition wall dividing the aeration tank 10 by adjusting the dissolved oxygen and sludge return rate, which is an important driving factor in sewage and wastewater treatment. By adjusting the area, it is possible to adjust the treatment capacity while maintaining the operational stability of the sewage and wastewater treatment facility.

Aerobic suspended growth process using activated sludge supplies oxygen necessary for the growth of microorganisms using aeration device and maintains the floating characteristics of the microorganisms and the mixing characteristics of the reaction tank to secure contact opportunities between microorganisms and organic substances to be treated. It is the process of removing organic matter in waste water.

The major aerobic flotation-type processes include standard activated sludge process, continuous batch activated sludge process, fully mixed activated sludge process, and oxidized ball process, and the continuous batch process or oxidized ball process is mainly used for small-scale treatment plants, and standard for medium-sized treatment plants. Activated sludge process or fully mixed activated sludge process is mainly used.

The sewage and wastewater treatment facility in which the standard activated sludge process is performed includes a single or multi-stage aeration reactor 19, aeration facility 38 for supplying compressed air or pure oxygen to the reactor 19, and , A sedimentation basin for separating suspended solids (MLSS) from wastewater or treated water, a conveying device for collecting and conveying the precipitated MLSS, and a device for collecting and disposing excess sludge.

The conventional standard activated sludge process sewage and wastewater treatment facility illustrated in FIG. 1 is composed of a single aeration reactor 19 and an associated facility having a single aeration facility 38 installed therein, each of the reactor 19 inlet and outlet. The rechargeable battery 21 and the secondary rechargeable battery 22 are configured, and a conveying pipe 40 and a conveying pump 49 for collecting sludge from the secondary rechargeable battery 22 and feeding the sludge to the reactor 19 are configured. An air pressure feeding means such as a blower 39 is connected to the aeration system 38 in the reaction tank 19 to supply air to the treated water stored in the reaction tank 19.

In biological treatment facilities using activated sludge, the growth of microorganisms varies greatly depending on the operating conditions of the treatment plant, so the food to microorganism (F / M) ratio, mean cell residence time (MRT) or dissolved oxygen (DO) , Operating conditions such as Dissolved Oxygen should be optimized.

The oxygen demand of the standard activated sludge process by empirical method is 30 ~ 55㎥ / kgBOD5 removal when the F / M ratio is more than 0.3kgBOD / kgMLVSS / day, and 24 ~ 36㎥ / kgBOD5 removal for the porous acid group.

In addition, when the F / M ratio is less than 0.3kgBOD / kgMLVSS / day, the air supply is increased to 75 ㎥ / kgBOD 5 to 115 ㎥ / kgBOD 5 removal due to endogenous breathing, nitrification and long aeration time.

When the organic matter concentration in the reactor 19 is below a certain concentration, that is, when the F / M ratio is low, the growth rate of filamentous bacteria is faster than that of flock forming bacteria, and sludge bulking is performed. Will occur.

According to the design guidelines of the public wastewater treatment plant, the dissolved oxygen concentration in the aeration reactor 19 of the activated sludge process needs to be maintained at a range of 1.5 mg / L to 4.0 mg / L at every point in the reactor 19, preferably 2.0. It is preferable to satisfy the range of mg / L to 4.0 mg / L, and the capacity of the aeration device needs to be set so that 0.5 mg / L or more is maintained even at the maximum load.

However, in actual operation of sewage and wastewater treatment facilities, not only the flow rate and concentration of influent changes continuously due to various factors such as seasonal factors, but also other conditions such as temperature change, so that it is possible to maintain optimal operating conditions. It is virtually impossible to artificially adjust the water inflow environment. Therefore, in general sewage and wastewater treatment facilities, an operation method of giving up excessive amounts to requirements or injecting chemicals is applied.

Among these measures to secure operating conditions, chemical input may cause side reactions or secondary pollution, aside from the problem of procurement and input cost, and excessive abandonment causes enormous energy consumption.

The air pressure to the reactor 19, that is, aeration, is the most energy-consuming unit process in the activated sludge process, and the power required is from 50% to 90% of the total power required, so the DO concentration of the reactor 19 is reduced. Efficient operation by regulation is a key factor in securing economic feasibility in activated sludge process.

Therefore, in order to maintain an optimal DO concentration for securing economic feasibility, an ORD or Oxygen Uptatke Rate (OUR, Oxygen Uptatke Rate) is used to measure the real-time respiration rate instead of DO. On the basis of this, a plan for maintaining optimal DO concentration required for microorganisms has been sought.

However, the method of maintaining the optimal DO concentration by such a measuring instrument is difficult to apply in a low load with low BOD volume load, that is, a low F / M ratio, and thus a method capable of directly changing the capacity of the reactor 19 such as a series operation or a continuous batch process is possible. It can be a more effective solution.

The continuous batch process is a process in which a unit process of removing contaminants of activated sludge, precipitation of mixed liquor, draining of supernatant, and removal of settling sludge is repeatedly performed in one continuous batch reactor (SBR). The process proceeds continuously according to the prescribed time series procedure.

Such a continuous batch reactor can change the use of the reactor into a bioreactor or sedimentation tank depending on the time of the process, but nevertheless, the necessity of physical division of the reactor space is raised for the purpose of adjusting the flow rate, mitigating the impact of inflow, and paralleling some processes. In this regard, a continuous batch reactor in which variable to movable partitions are installed in the reactor has been developed, and related prior arts include Patent No. 445462 and the like.

However, when the variable or movable bulkhead is configured as described above, not only the construction cost of the reactor can be increased, but also complicated power equipment for driving the bulkhead is required, and enormous operation and maintenance costs are inevitable. Do.

In view of the above-described problems, the present invention was devised to obtain a capacity control effect of a reaction tank by adjusting a movable area and a return sludge inlet of an aeration device without installing a physical bulkhead, and give up and return sludge to treated water. In the activated sludge process wastewater treatment facility where the injection of wastewater is carried out in the aeration tank 10, a plurality of aeration modules 30 are formed in the lower portion of the aeration tank 10, in which a plurality of aeration apparatuses 35 for ejecting air are formed. However, each of the aeration module 30 is capable of driving individually, a plurality of aeration module 30 is arranged along the end-phase treated water transfer direction of the aeration tank 10, the sludge collected from the secondary sedimentation battery 22 The conveying pipe 40 to be transported is installed in the aeration tank 10, the conveying pipe 40 is formed in the same number of the input pipe 41 and the same number of the aeration module 30 and each input pipe 41 Is equipped with a return valve 42, the inflow of the aeration tank (10) The load measuring instrument 55 for detecting the contaminant concentration of the influent treatment water is installed, and the aeration module 30, the return valve 42 and the load measuring instrument 55 are connected to the controller 99, and the load measuring instrument 55 Activated sludge process abandonment zone classification operation type sewage and wastewater treatment facility, characterized in that the controller 99 is controlled by the controller 99 whether the operation of the aeration module 30 and the opening and closing of the return valve 42.

In addition, the inlet side diffuser 35 of the aeration tank 10 of the diffuser 35 of the aeration module 30 is hardened to the outlet side of the aeration tank 10, and the air is blown out of the diffuser 35. Activated sludge process abandonment zone classification operation type wastewater and wastewater treatment facility characterized in that the direction is formed inclined toward the outlet side of the aeration tank (10).

In addition, in the operating method of the activated sludge process abandonment zone type operation sewage / wastewater treatment facility, the pollutant load measurement value of the load measuring instrument 55 is periodically input to the controller 99 to be stored in the storage device of the controller 99. In the step of storing, the processing unit of the controller 99 withdraws the pollutant load measurement value in the sample time from the storage device to calculate the average pollutant load, and if the average pollutant load is greater than or equal to the reference value, the controller 99 returns the entire abandoned module ( 30) and the controller 99 stops the aeration module 30 on the inlet side of the aeration tank 10 when the average pollution load is less than the reference value, and the aeration module 30 on the outlet side is operated. Activated sludge process abandonment zone classification Operation method of operating sewage and wastewater treatment facility.

Through the present invention, it is possible to secure treatment efficiency and breakthrough energy savings only by optimizing the operation method of the aeration tank 10 without significant change or chemical input to the structure of activated sludge sewage and wastewater treatment facilities such as a movable partition.

In addition, the operation of each area of the aeration device 10 in the aeration tank 10 and an operation method of injecting conveying sludge into the aeration area maintain effects on processing efficiency and prevent bulking even under a low F / M ratio. You can get it.

In particular, by reducing the energy required to operate the aeration tank 10, not only can the operating cost of the sewage / wastewater treatment facility be reduced, but also a simple configuration without the movable bulkhead is possible. Construction and maintenance costs can also be reduced.

1 is a schematic diagram of a facility of a conventional standard activated sludge process
Figure 2 is a schematic diagram of the facility of the present invention
3 is a perspective view of an embodiment of the present invention
Figure 4 is a partial cutaway perspective view of an embodiment of the present invention
5 is a longitudinal cross-sectional view of one embodiment of the present invention;
Figure 6 is a perspective view of the abandonment module and the transfer pipe of an embodiment of the present invention
7 is an explanatory diagram of a driving method of the present invention;
Figure 8 is a partial cutaway perspective view of a subdivided embodiment of the present invention
Figure 9 is a longitudinal cross-sectional view of the diffuser partial hardness embodiment of the present invention

Figure 1 shows the operation of the conventional standard activated sludge process, as shown, the treated water passing through the primary needle cell 21 is supplied to the reaction vessel 19, the same for the entire reaction tank 19 Is supplied, and the method of conveying and supplying a part of the sludge produced by the secondary needle battery 22 at the front end of the reaction tank 19 is applied.

That is, the treated water from which the solid sediment is removed from the primary settler cell 21 is introduced into the reaction vessel 19, but a single aeration plant 38 is installed inside the reaction vessel 19 to provide uniform uniformity for all areas of the reaction vessel 19. The aeration is carried out, and the treated water passing through the reaction tank 19 is supplied to the secondary needle battery 22, and the secondary needle battery 22 and the inlet of the reaction tank 19 are connected to the transfer pipe 40 and the transfer pipe ( 40, a conveying pump 49 is mounted, and a part of the sludge produced by the secondary needle battery 22 is conveyed to the reactor 19 and supplied.

Therefore, irrespective of the pollutant load of wastewater flowing into the reactor 19, only a uniform abandonment of the entire area of the reactor 19 is possible, and the input point of the returned sludge is also fixed to the inlet of the reactor 19. Only driving is possible.

On the other hand, in the present invention, as shown in Figure 2, the aeration zone in the aeration tank 10 is divided into a plurality of unit aeration zone, the space in the same aeration tank 10 is divided into aeration zone and non-aeration zone Can be driven.

In addition, the distal end portion of the conveying pipe 40 for conveying and supplying the sludge produced in the secondary sedimentation battery 22 to the aeration tank 10 is composed of a plurality of branch pipes, and the outlets of these branch pipes are equal to the unit aeration area. In addition, the conveying sludge can be supplied to the front end of the aeration area in addition to the variable operation of the aeration area described above.

In the present invention, the unit aeration zone set in the aeration tank 10 is not realized by separating the treated water by a physical partition means such as a partition wall, but is implemented according to the driving mode of the aeration module 30 driven independently. The detailed configuration of the aeration tank 10 of the present invention is illustrated in Figs.

First, Figure 3 illustrates the external appearance of the sewage and wastewater treatment facility of the present invention, and as can be seen from the drawing, the aeration tank in which the wastewater and wastewater treatment facility of the present invention is subjected to aeration and return of sludge to the treated water is carried out. (10) is configured, and the first and second needle batteries 21 and 22 are installed at the front and rear ends of the aeration tank 10, respectively, and the treated water from which the solids are removed from the primary needle battery 21 is The aeration tank 10 is supplied, and the treated water flowing out of the aeration tank 10 is supplied to the secondary needle battery 22.

In addition, as shown in Figures 4 and 5, the lower portion of the aeration tank 10, a plurality of aeration module 30, which is composed of a plurality of air dispersing mechanisms 35 for blowing air upwards are constructed, respectively, The aeration module 30 of the independent individual drive is possible, these a plurality of aeration module 30 is arranged along the longitudinal transfer water treatment direction of the aeration tank (10).

That is, in the present invention, the aeration module 30 is an aeration system that is configured as a single line and independently driven, and as shown in FIG. 6, an exhaust pipe is provided to the single air inlet pipe 31 and the air inlet pipe 32. (33) is connected, and the exhaust pipe 33 is provided with an air diffuser (35), which is the final air outlet, and as shown in Figure 2, each of the aeration module (30) is individually driven blower (39), etc. Air supply means is connected.

Although not shown in Figures 4 and 5, the blower (39) is connected to the air supply pipe 31 forming the inlet end of the aeration module 30, the air is compressed, the air is the air pipe 31, A plurality of diffusers (35) forming a single aeration module (30) are discharged to the outside through the diffuser (32) and the exhaust pipe (33) mounted to the exhaust pipe (33) mounted on the exhaust pipe (33) Is accompanied by operation while forming a group of diffusers 35.

In the embodiment illustrated in FIGS. 2 to 5, two aeration modules 30 are configured in the aeration tank 10, and the unit aeration zones formed by the aeration modules 30 are also included. While dividing the inner space of the aeration tank 10, two independent unit aeration zones are formed.

That is, in the present invention, the inner space of the aeration tank 10 is physically partitioned by a partition wall, so that the treated water of each compartment is not physically isolated, but as shown in the lower view of FIG. 7, according to the selective operation of the aeration module 30. On the basis of the boundary as shown by the virtual line in the figure, the aeration tank 10 is divided into a plurality of unit aeration areas, and the anaerobic / expiratory state of the divided space is set.

In particular, the aeration tank 10 of the present invention is formed in a tubular flow (Plug Flow) state that is roughly separated from the Completely Mixed Flow (Completely Mixed Flow), the unit aeration zone corresponding to the aeration module 30 as described above is more easily It can be formed clearly, in order to maintain the inflow and outflow balance and inflow even distribution for the tubular flow state in the aeration tank 10, as shown in Figure 4 and 5, the front and rear ends of the aeration tank 10, respectively (全 幅) The overflow part is formed, and the proper head difference between the inflow part and the outflow part is formed.

Therefore, in the treated water in the aeration tank 10 of the present invention, not only a relatively slow flow of slow flow is formed in the entire vertical section from the inlet to the outlet, but also a relatively constant flow rate distribution is formed across the entire cross section. Bar, the influence of the inlet side according to the outlet side situation is limited.

That is, in the state in which two sets of aeration modules 30 are configured as shown in FIG. 6, the inflow side aeration module 30 of the inflow side aeration module 30 on the left side and the outflow side aeration module 30 on the right side in the same view, When the module 30 is stopped but only the outflow side aeration module 30 is operated, even if air is actively released from the diffuser 35 of the outflow side aeration module 30, the effect is on the top of the outflow side aeration module 30. It is limited to the treated water, even if the bubble released from the diffuser (35) diffuses laterally, the one-sided transfer of the tubular flow treated water cancels the inflow-side diffusion to a large extent, so that the lower part of FIG. As shown in the figure, the outflow unit aeration area and the inflow unit aeration area can be isolated based on a virtual boundary represented by a virtual line on the drawing.

Therefore, in the operation of the aeration tank 10 of the present invention, when the entire aeration module 30 configured in the aeration tank 10 is operated as shown in the upper view of FIG. 7, the entire aeration tank 10 is a single aeration tank 10 and a whole. It can be operated in a abandoned state, when operating only the outflow side aeration module 30 as shown in the lower view of Figure 7 operates only a part of the outflow side of the aeration tank 10, but the remaining inflow area is free (위) ) State, that is, it can be operated to perform a function such as a kind of inflow tank or flow control tank, thereby obtaining the effect of changing the actual capacity of the aeration tank 10, and enables efficient treatment without oversaturation even in a poor load state. do.

Meanwhile, in the present invention, a plurality of aeration modules 30 and unit aeration zones are set in the aeration tank 10, and a corresponding sludge input pipe is also constructed to double the above-described virtual partition operation effect.

That is, as shown in Figures 4 to 6, the conveying pipe 40 to which the sludge collected from the secondary sedimentation battery 22 is transported is installed in the aeration tank 10, the conveying pipe 40, the aeration module 30 The feed pipe 41 of the same number is formed, and the feed valve 42 is attached to every feed pipe 41, and the feed point of the conveyance sludge of the end phase of the aeration tank 10 can be adjusted.

As shown in FIG. 6, the sludge conveying pipe has a conveying pipe 40, which is a main pipe connected to the discharge port of the conveying pump 49, and a discharging port at the end as a branching pipe branched from the conveying pipe 40. (30) It is composed of a feed pipe 41 and the like located in the upper portion, each of the feed pipe 41 is provided with a conveying valve 42, the feed point of the conveying sludge is adjusted as the conveying valve 42 is selected and opened do.

Therefore, as shown in the upper drawing of FIG. 7, when the entire aeration tank 30 is operated by operating the entire aeration tank 30 configured in the aeration tank 10 as a single aeration tank 10 and the entire aeration state, as shown in FIG. 7. Opening the conveying valve 42 in the upper part of the inlet side aeration module 30 to inject the conveying sludge into the inlet of the aeration tank 10, and as shown in the lower view of FIG. In this case, the inlet-side conveying valve 42 is closed and the conveying sludge is opened to the outlet-side aeration module 30 by opening the conveying valve 42 on the top of the outlet-side aeration module 30.

On the other hand, the above-described waste water treatment plant of the present invention can be operated in such a way that the operating state is automatically adjusted according to the measurement of the contaminant concentration of the inflow treatment water of the aeration tank 10, such automatic wastewater treatment plant of the present invention Operation may be performed by a controller 99 which is connected to a measuring instrument for detecting the state of the treated water in the aeration tank 10 and controls the above-mentioned aeration module 30 and the return valve 42.

In the automatic operation of the present invention, the control of the aeration module 30 and the return valve 42 is performed based on the contamination load of the inflowing treatment water. For this purpose, as shown in FIGS. 2 and 5, the inflow of the aeration tank 10 is performed. The unit is provided with a load measuring instrument 55 for detecting the contaminant concentration of the influent treatment water, the aeration module 30, the return valve 42 and the load measuring instrument 55 is connected to the controller 99, the load measuring instrument ( According to the measured value of 55, the controller 99 controls whether the aeration module 30 is operated and whether the return valve 42 is opened or closed.

The load meter 55 installed at the inlet of the aeration tank 10 of the present invention is a device for measuring the concentration of contaminants in the treated water, and is a chemical oxygen demand (COD) meter, a biochemical oxide demand (BOD) meter, or a TOC (Total Organic Carbon). A measuring instrument or the like may be applied, and the load measuring instrument 55 may be implemented in a manner capable of real-time measurement.

In addition, as shown in FIGS. 2 and 5, in addition to the load meter 55, a plurality of treated water state detection means such as a DO (Dissolved Oxygen) measurer 56 may be installed, thereby processing according to the operation of the aeration tank 10. The status of the water and its processing efficiency can be identified.

As shown in FIG. 2, the controller 99 connected to the load measuring instrument 55 and receiving the measurement value transmitted from the load measuring instrument 55 is installed in the blower 39 and the conveying pipe 40 configured in the aeration module 30. The transfer valve 42 is connected, so that the controller 99 controls the operation of the blower 39 and the transfer valve 42. The controller 99 is a programmable programmable logic controller (PLC) to a computer. In addition, a self processing device and a memory device are built in to process the information transmitted from the load meter 55 and to interrupt the power of the connected general devices.

That is, the operation method of the sewage and wastewater treatment facility of the present invention is performed in such a manner that the states shown in the upper and lower portions of FIG. 7 are respectively converted according to the pollution load of the treated water flowing into the aeration tank 10. The pollutant load measurement of 55 is periodically input to the controller 99, and the input pollutant load measurement is started in the memory device of the controller 99.

Thereafter, the processing unit of the controller 99 may calculate the average contamination load by extracting the contamination load measurement value measured for a time from the time point before the preset sample time to the point of time among the pollution load measurement values stored in the memory device. This is to prevent the sensitive operation (을 敏) by detecting and excluding the transient fluctuation of the contaminated load of the aeration tank 10 inflow treatment water.

When the controller 99 adjusts the operation state of the aeration module 30 according to the measurement value of the load measuring instrument 55, the measurement value sent from the load measuring instrument 55 is simply followed, and the measurement value periodically and repeatedly sent out is lower than the reference value. Alternatively, when the operation state of the aeration module 30 is changed immediately above, the controller 99 reacts sensitively to a temporary pollution load change, and thus the sudden operation and sudden stop of the aeration module 30 or the return valve 42 are made. Frequent and thus lower the treatment efficiency, as well as unnecessary energy consumption and equipment aging can result.

Accordingly, in the present invention, by setting a predetermined sample time and applying a method of averaging the measured values from the time point before the sample time, the abandonment module 30 is applied to the temporary measurement value change that does not involve significant pollution load change. Alternatively, the operation state of the transfer valve 42 is not changed.

As such, in the present invention, the aeration module 30 or the return valve 42 is operated by comparing the average contamination load, which is an average value of the pollution load measurement values in the sample time immediately before the point of time, with a preset reference value, wherein the average contamination load is preset. When calculated above the reference value, the controller 99 operates the entire aeration module 30, and when the average pollution load is less than the preset reference value, the controller 99 stops the aeration module 30 on the inflow side of the aeration tank 10 and flows out. The aeration module 30 on the side is operated, thereby enabling the proper aeration tank 10 to be operated under the treated water condition corresponding to the design pollution load, and optimizing even in a poor load condition that significantly falls below the planned pollution load. Not only the abandoned aeration tank 10 can be operated, but also the unnecessary superaeration operation can be excluded and energy saving can be aimed at.

As described above, a plurality of aeration modules 30 may be set in the aeration tank 10 of the sewage and wastewater treatment facility of the present invention, and the aeration modules 30 are arranged in a line on the end of the aeration tank 10, and aeration tanks (10) As well as two sets of aeration module 30 for dividing the internal space can be configured, as shown in Figure 8, subdivision (細分 形) aeration tank 10 is composed of three or more sets of aeration module 30 May be configured.

In particular, the setting of the abandonment module 30 of the present invention can be performed not only at the time of initial construction of the aeration tank 10, but also in the existing facility in which the aeration device of a single pipe is configured, the air supply branch 32, the air inlet 31 ) And a relatively simple step of replacing or adding the blower 39 may be implemented.

On the other hand, Figure 9 shows an embodiment of the diffuser 35 partial hardness type of the present invention, it can further double the isolation effect of the above-described outflow unit unit aeration zone (역).

That is, as shown in FIG. 9, the inflow-side diffuser 35 of the aeration tank 10 among the diffusers 35 of the aeration module 30 is hardened to the outflow side of the aeration tank 10, and thus the corresponding diffuser ( The air blowing direction of 35) is inclined toward the outlet side of the aeration tank 10, thereby strongly suppressing the diffusion action of the aeration tank 10 inlet side of the air discharged from the aeration mechanism 35.

In the piping of the aeration module 30, which is composed of the air inlet pipe 31, the air inlet pipe 32, and the exhaust pipe 33, the air is compressed in the compressed air state, and finally, the air diffuser 35 reaches the diffuser 35 as the final discharge port. The bubble is released is basically moved upward by the release pressure and buoyancy in the diffuser 35, and at the same time diffused to both sides.

In addition, the bubble once separated from the diffuser 35 is transferred to one side from the inflow side of the aeration tank 10 to the outflow side in accordance with the flow of the treated water together with the upward movement and both side diffusion.

Therefore, the distribution state of the bubbles on the longitudinal cross-section of the aeration tank 10 may be formed by combining the forward one-way (advection) and the forward and reverse lateral diffusion of the bubbles released from the diffuser (35), As described above, the aeration tank 10 of the present invention has a tubular flow (Plug Flow) state is formed, it is possible to more precisely set the unit aeration zone by suppressing the reverse diffusion at the inlet side boundary of the aeration module (30).

That is, as shown in Figure 9, when the aeration module 30 is configured on each of the inlet and outlet side of the aeration tank 10, at the boundary of both side aeration module 30, bubbles discharged from the outlet side aeration module 30 By suppressing the reverse diffusion of the aeration tank 10, despite the stop of the inlet side aeration module 30, the bubble discharged from the outlet side aeration module 30 of the aeration tank 10 is diffused in the reverse direction and the boundary between the unit aeration zone is broken In order to prevent the phenomenon, as described above, an inclination is formed in the diffuser 35 so that forward diffusion cancels reverse diffusion.

As such, by suppressing the reverse diffusion of the diffuser 35 discharge bubbles, the unit aeration zone can be clearly partitioned without physical containment means as shown in FIG. 9.

10: abandonment
19: reactor
21: primary battery
22: secondary rechargeable battery
30: abandon module
31: pipeline
32: air blowing branch
33: exhaust pipe
35: diffuser
38: aeration equipment
39: blower
40: return pipe
41: input tube
42: conveying valve
49: conveying pump
55 load gauge
56: DO measuring instrument
99: controller

Claims (3)

Aeration sludge process wastewater treatment facility in which aeration and return of sludge to the treated water is carried out in the aeration tank 10, and aeration of the aeration tank 10 is provided with a plurality of acid mechanisms 35 that eject air. A plurality of modules 30 are constructed, each of the aeration module 30 is capable of driving separately, a plurality of aeration module 30 is arranged along the end-phase treatment water transfer direction of the aeration tank 10, secondary secondary battery A conveying pipe 40 through which the sludge collected at 22 is conveyed is installed in the aeration tank 10, and a conveying pipe 40 is formed with an equal amount of input pipe 41 with the aeration module 30. And each of the inlet pipe 41 is equipped with a return valve 42, the inlet of the aeration tank 10 is provided with a load measuring instrument 55 for detecting the contaminant concentration of the influent treatment water, the aeration module 30, The conveying valve 42 and the load gauge 55 are connected to the controller 99 and connected to the controller 99 according to the measurement value of the load meter 55. In the activated sludge process abandonment zone type operation type sewage / wastewater treatment facility where the operation of the aeration module 30 and the opening / closing of the return valve 42 are controlled by
Among the diffusers 35 of the aeration module 30, the inflow side diffuser 35 of the aeration tank 10 is hardened to the outlet side of the aeration tank 10, so that the air blowing direction of the diffuser 35 is changed. Aeration tank (10) Activated sludge process aeration area, characterized in that the inclined to the outflow side operation type sewage and wastewater treatment facility.
In the method of operating the activated sludge process abandonment zone division operation type sewage and wastewater treatment facility of claim 1,
Polluting load measurement values of the load measuring instrument 55 are periodically input to the controller 99 and stored in the storage device of the controller 99;
Calculating, by the processing unit of the controller 99, the contamination load measurement value in the sample time from the storage device to calculate an average contamination load;
If the average pollution load is greater than or equal to the reference value, the controller 99 operates the entire aeration module 30, and if the average pollution load is less than the reference value, the controller 99 stops the aeration module 30 on the inlet side of the aeration tank 10 and flows out. Operation method of the activated sludge process abandonment zone type operation sewage and wastewater treatment facility, characterized in that the aeration module 30 of the side is made to operate. delete

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