KR20240028607A - Sequencing Batch Reactor type wastewater treatment system with internal circulation - Google Patents

Abstract

The present invention configures a continuous batch water treatment device by combining two unit reaction tanks, and allows each unit reaction tank to proceed with the processes of mixing-aeration-internal circulation outflow-sedimentation-discharge-internal circulation inflow with time difference, and each unit reaction tank It relates to a continuous batch water treatment device capable of internal circulation that can improve denitrification efficiency and increase raw water treatment capacity by internally circulating process water to another unit reaction tank at the end of the aeration stage, the internal circulation according to the present invention. The continuous batch water treatment device capable of circulation consists of a first continuous batch unit reaction tank (hereinafter referred to as '1 It consists of a second continuous batch unit reaction tank (hereinafter referred to as 'tank 2'), and the process water from the tank where the internal circulation outflow step is performed is supplied to the tank where the internal circulation inflow step is performed. Do it as

Description

Sequencing Batch Reactor type wastewater treatment system with internal circulation}

The present invention relates to a continuous batch water treatment device capable of internal circulation. More specifically, a continuous batch water treatment device is formed by combining two unit reaction tanks, and each unit reaction tank is mixed at different times - aeration - internal circulation discharge - sedimentation. - The process of discharge-internal circulation inflow is carried out, and at the end of the aeration stage of each unit reaction tank, the process water is internally circulated to other unit reaction tanks, thereby improving denitrification efficiency and increasing raw water treatment capacity. It relates to a continuous batch water treatment device capable of circulation.

Representative sewage treatment processes include the A2O (Anaerobic-Anoxic-Oxic) process, SBR (Sequencing Batch Reactor) process, standard activated sludge process, ICEAS process, and modified Bardenpho process.

Among these, the A2O process is an improved version of the AO process to effectively remove nitrogen components. It is an anaerobic tank that releases phosphorus, an anoxic tank that denitrifies nitrate nitrogen into nitrogen, and consumes phosphorus and converts ammonia nitrogen into nitrate nitrogen. It consists of an aerobic tank for nitrification, and has the advantage of increasing denitrification efficiency by internally returning the reaction water from the aerobic tank to the anoxic tank. On the other hand, it has the disadvantage of requiring not only a plurality of reaction tanks but also a separate sedimentation tank, which requires a large installation site.

The continuous batch (SBR) process involves sequentially performing the mixing, aeration, precipitation, and discharge processes within a single reactor. It has the advantage of simple facilities and easy operation, such as not requiring a settling basin. On the other hand, there is a limit to the denitrification efficiency because there is no internal return process from the aerobic tank to the anoxic tank as in the A2O process.

In order to improve the limitations of this continuous batch (SBR) process, Korean Patent No. 2214449 improves nitrogen removal efficiency without supplying external carbon sources or separate alkalinity substances by additionally supplying raw water to each of the raw water inflow stage and biological reaction stage. We present technologies that can be used. However, since the method simply supplies additional raw water, the improvement in nitrogen removal efficiency is inevitably limited.

As another improvement method, Korean Patent No. 2124730 is based on a continuous injection pseudo-SBR (CIP-SBR) process and is equipped with a pretreatment reactor (110) and a main treatment reactor (120) and enables internal return to produce nitrate nitrogen. It presents a technology that can enhance the processing of . However, since the pretreatment reactor 110 is provided only for internal conveyance and the functions of the pretreatment reactor 110 and the main treatment reactor 120 are different from each other, the device configuration is complicated and process efficiency is low.

In addition, Korean Patent No. 2315900 proposes a configuration to increase nitrogen removal efficiency through a wastewater treatment system combining A2O and SBR, but the main treatment reactor (B) consists of an aeration tank, first reaction tank, and second reaction tank. In addition to being complex in terms of equipment, an installation area comparable to that of the A2O process is required.

Korean Patent No. 2214449 (announced on February 9, 2021) Korean Patent No. 2124730 (announced on June 19, 2020) Korean Patent No. 2315900 (announced on October 28, 2021)

The present invention was devised to solve the above problems, and constitutes a continuous batch water treatment device by combining two unit reaction tanks, and each unit reaction tank is divided into mixing-aeration-internal circulation discharge-sedimentation-discharge-internal with time difference. The process of circular inflow is carried out, and at the end of the aeration stage of each unit reactor, the process water is internally circulated to other unit reactors, thereby improving denitrification efficiency and enabling continuous internal circulation that can increase raw water treatment capacity. The purpose is to provide a batch water treatment device.

In order to achieve the above object, the continuous batch water treatment device capable of internal circulation according to the present invention progresses the mixing stage, aeration stage, internal circulation outflow stage, sedimentation stage, discharge stage, and internal circulation inflow stage in time series with time differences. It consists of a first continuous batch unit reaction tank (hereinafter referred to as 'tank 1') and a second continuous batch unit reaction tank (hereinafter referred to as 'tank 2'), and the number of processes in the tank in which the internal circulation discharge step is performed is It is characterized in that it is supplied to a tank in which the internal circulation inflow stage is carried out.

The internal circulation outflow stage of either group 1 or 2 proceeds at the same time as the internal circulation inflow stage of the other group, and the end time of the abandonment stage of either group coincides with the end time of the discharge stage of the other group.

In Group 1, the process proceeds in the following order: mixing stage, aeration stage, internal circulation outflow stage, sedimentation stage, discharge stage, and internal circulation inflow stage, and in Stage 2, the process proceeds in the following order: sedimentation stage, discharge stage, internal circulation inflow stage, mixing stage, aeration stage, The process can proceed in the order of internal circulation outflow steps.

In tank 1 or tank 2, the internal circulation inflow stage that follows the discharge stage is operated under anoxic and anaerobic conditions.

In either group 1 or 2, the internal circulation outflow stage, which follows the aeration stage, is operated under aerobic or anoxic conditions. If the organic matter concentration in the raw water is high, which is higher than the preset standard concentration, the internal circulation outflow stage is operated under aerobic conditions. If the organic matter concentration is low, lower than the preset standard concentration, the internal circulation outflow stage is operated under anoxic conditions.

It further includes internal circulation piping provided in tanks 1 and 2, respectively, and an opening/closing valve that selectively connects or blocks the internal circulation piping of tanks 1 and 2, and the process water of the tank in which the internal circulation outflow stage is performed is connected to the internal circulation piping and the opening/closing valve. It is supplied to the tank where the internal circulation inflow stage progresses.

Raw water is supplied in the internal circulation inflow stage and mixing stage that occur after the discharge stage.

The continuous batch water treatment device capable of internal circulation according to the present invention has the following effects.

Two continuous batch unit reactors each carry out the continuous batch process at different intervals, and the process water that has completed the aeration stage is supplied to the unit reactor that has completed the discharge stage, so that the process water that has gone through the nitrification process flows into the mixing stage of the continuous batch process. This effect improves denitrification efficiency.

1 is a configuration diagram of a continuous batch water treatment device capable of internal circulation according to an embodiment of the present invention.
Figure 2 is a reference diagram for explaining the operation of a continuous batch water treatment device capable of internal circulation according to an embodiment of the present invention.

The present invention presents technology for a continuous batch water treatment device that can expect high denitrification efficiency. More precisely, we present a technology for a continuous batch water treatment device that can improve the removal efficiency of nitrate nitrogen.

As previously described in 'Technology Background of the Invention', the A2O process can increase denitrification efficiency through internal return from an aerobic tank to an anoxic tank, while the continuous batch process (SBR) process involves mixing, aeration, and denitrification in one reaction tank. There are advantages in installation and operation as the precipitation and discharge processes are carried out sequentially, but since internal return is not possible, the denitrification efficiency is inevitably lower than that of the A2O process.

In constructing a continuous batch water treatment device, the present invention can be expected to improve denitrification efficiency by enabling 'internal circulation' corresponding to the internal return of the A2O process. For this purpose, a continuous batch water treatment device is constructed with two continuous batch unit reaction tanks, and each continuous batch unit reaction tank allows the processes of mixing-aeration-internal circulation outflow-sedimentation-discharge-internal circulation inflow to proceed with time lag. We propose a configuration in which process water from a continuous batch unit reactor whose stage has been completed is 'internally circulated' to another continuous batch unit reactor.

In this specification, 'internal circulation' refers to the process in which the process water of a continuous batch unit reactor after the aeration stage is supplied to another continuous batch unit reactor, and further, 'internal circulation outflow' refers to the process in which the process water of a continuous batch unit reactor at the end of the aeration stage is supplied to another continuous batch unit reactor. This means that process water flows out into another continuous batch unit reactor, and 'internal circulation inflow' means that process water flows from one of the two continuous batch unit reactors to the other continuous batch unit reactor.

Additionally, in proceeding with 'internal circulation', the process water of the continuous batch type unit reaction tank in which the aeration step has been completed is internally circulated to another continuous batch type unit reaction tank in which the discharge step has been completed. For example, the process water at the time when the aeration stage of the first continuous batch unit reactor is completed is internally circulated to the second continuous batch unit reactor where the discharge stage is completed. At this time, the first continuous batch unit reaction tank corresponds to the internal circulation outflow stage, and the second continuous batch unit reaction tank corresponds to the internal circulation inflow stage. Vice versa, the process water at the time when the aeration stage of the second continuous batch unit reactor is completed is internally circulated to the first continuous batch unit reactor where the discharge step is completed. In this case, the second continuous batch unit reactor is internally circulated. It corresponds to the circulation outflow stage, and the first continuous batch unit reaction tank corresponds to the internal circulation inflow stage.

In order to enable such internal circulation, the first continuous batch unit reaction tank proceeds in the following order: mixing - aeration - internal circulation outflow - sedimentation - discharge - internal circulation inflow, and the second continuous batch unit reaction tank proceeds in the order of precipitation - discharge - internal circulation. The process must proceed in the following order: circulation inflow, mixing, abandonment, and internal circulation outflow.

In the continuous batch process, the aeration stage is operated under aerobic conditions, and the mixing stage that follows the discharge stage is operated under anoxic conditions. The aeration stage of the continuous batch process corresponds to the aerobic tank of the A2O process, and the mixing stage of the continuous batch process is operated under aerobic conditions. It can be considered an anoxic tank in the A2O process.

In response to the A2O process increasing the denitrification efficiency in the anoxic tank by internally returning the process water from the aerobic tank in which nitrification has been completed to the anoxic tank, the present invention provides the process water of the first continuous batch unit reaction tank in which the aeration step has ended. 2 As the so-called 'internal circulation' supplied to the continuous batch unit reaction tank progresses, the effect of internal return of the A2O process, that is, high denitrification efficiency, can naturally be expected through the internal circulation of the present invention.

As two continuous batch unit reactors are required, twice the installation area may be required compared to a normal continuous batch reactor. However, the total installation area of two continuous batch unit reactors can be compared to the installation area of one normal continuous batch reactor. It is also possible to design it to correspond, and in this case, the denitrification efficiency is improved compared to the same installation area compared to one typical continuous batch reaction tank.

Hereinafter, a continuous batch reaction tank capable of internal circulation according to an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a continuous batch water treatment device capable of internal circulation according to an embodiment of the present invention includes a first continuous batch unit reaction tank 110 and a second continuous batch unit reaction tank 120 arranged adjacent to each other.

The first continuous batch unit reactor 110 and the second continuous batch unit reactor 120 each sequentially perform a continuous batch process, that is, a mixing stage, an aeration stage, an internal circulation outflow stage, a precipitation stage, a discharge stage, and an internal circulation inflow stage. In progress, the operating conditions and operating times of the continuous batch process conducted in each of the two unit reaction tanks (110) and (120) are the same. That is, the operating conditions such as anoxic (or anaerobic), aerobic, etc. in each of the mixing stage, aeration stage, internal circulation outflow stage, sedimentation stage, discharge stage, and internal circulation inflow stage, and the operating time of each stage are designed to be the same.

While the operating conditions and operating times of the continuous batch process in the two continuous batch unit reactors (110) and (120) are the same, the continuous batch process in the two continuous batch unit reactors (110 and 120) are carried out with time differences. Specifically, as shown in FIG. 2, either the first continuous batch unit reaction tank 110 or the second continuous batch unit reaction tank 120 has the following sequence: mixing - aeration - internal circulation outflow - sedimentation - discharge - internal circulation inflow. A continuous batch process is carried out, and the other is a continuous batch process in the following order: sedimentation - discharge - internal circulation inflow - mixing - aeration - internal circulation outflow.

Since the internal circulation outflow and internal circulation inflow of the two continuous batch unit reactors must proceed at the same time, the point in time when the aeration stage in one continuous batch unit reactor ends is the time when the discharge stage in the other continuous batch unit reactor ends. It matches. Here, the operation times for each of the mixing stage, aeration stage, sedimentation stage, and discharge stage can be set differently, but the operation time must be set so that the end point of the aeration stage coincides with the end point of the discharge stage of another unit reaction tank.

Each of the first continuous batch unit reaction tank 110 and the second continuous batch unit reaction tank 120 is provided with internal circulation pipes 111 and 121, and the first continuous batch unit reactor is connected through the internal circulation pipes 111 and 121. Process water from the reaction tank 110 or process water from the second continuous batch unit reaction tank 120 may be supplied to another unit reaction tank.

Specifically, the process water from the unit reaction tank at the end of the aeration stage is supplied to another unit reaction tank at the end of the discharge stage through the internal circulation pipes 111 and 121. For example, when the aeration stage is completed in the first continuous batch unit reactor 110, the process water of the first continuous batch unit reactor 110 is discharged through the internal circulation pipe 111 to the second continuous batch unit where the discharge stage has ended. It is supplied to the reaction tank 120. At this time, the first continuous batch unit reaction tank 110 corresponds to the internal circulation outflow stage, and the second continuous batch unit reaction tank 120 corresponds to the internal circulation outflow stage. Similarly, when the aeration stage of the second continuous batch unit reactor 120 is terminated, the process water of the second continuous batch unit reactor 120 is discharged through the internal circulation pipe 121 into the first continuous batch unit reactor whose discharge stage has ended ( 110), and in this case, the second continuous batch unit reaction tank 120 corresponds to the internal circulation outflow stage, and the first continuous batch unit reaction tank 110 corresponds to the internal circulation outflow stage.

The denitrification efficiency is improved by supplying the process water from the unit reaction tank at the time the aeration step is completed to another unit reaction tank at the end of the discharge step through the internal circulation pipe. Before explaining this, the mixing step, aeration step, and precipitation steps of the present invention are explained. , each discharge stage will be explained first.

The mixing step is a step in which raw water is supplied to each of the first continuous batch unit reaction tank 110 and the second continuous batch unit reaction tank 120 through the raw water supply pipe 160 and mixed by a stirrer. Although not shown in the drawing, a stirrer for stirring raw water or process water is provided in each unit reaction tank, and a diffuser 150 through which air is supplied is disposed at the bottom of each unit reaction tank. In addition, a treated water discharge device 140, such as a decanter, is provided to discharge the supernatant water, that is, the treated water, of each unit reaction tank, and the above-mentioned internal circulation pipes 111 and 121 are used to discharge the sedimented sludge of each unit reaction tank. It is installed to be located higher than the floor level. For example, the internal circulation pipes 111 and 121 may be installed at about the middle water level of each unit reaction tank, and the internal circulation pipe 111 of the first continuous batch unit reaction tank 110 and the second continuous batch unit reaction tank The internal circulation pipe 121 of (120) is selectively connected and blocked by the on-off valve 130, and in one embodiment, the on-off valve 130 may be a valve that automatically opens and closes by the water head difference. Additionally, the natural flow method can be used to supply raw water through the raw water supply pipe 160. A raw water distribution tank 170 is provided at the upper end of each unit reaction tank, and raw water from the raw water distribution tank 170 can be supplied to each unit reaction tank 110 and 120 through a natural flow method by gravity. In order to minimize disturbance of the sludge layer of each unit reaction tank during the raw water supply process, the raw water supply pipe 160 is preferably placed at regular intervals at the bottom of each unit reaction tank, and the raw water supply speed is also adjusted so that the sludge layer is not disturbed. It needs to be adjusted. The supply of raw water is carried out in the internal circulation inflow stage in addition to the mixing stage, which will be described later.

In the mixing stage, each unit reaction tank is operated under oxygen-free conditions, and in this mixing stage, decomposition of organic matter, denitrification of nitrate nitrogen into nitrogen gas, and release of phosphorus occur.

The aeration step is a step in which each unit reaction tank is operated under aerobic conditions by supplying air through the diffuser 150 at the end of the mixing step. Through the aeration step, the oxidation of organic matter and the conversion of ammonia nitrogen into nitrate nitrogen are performed. Nitrification and phosphorus intake proceed. At this time, the process water in the aeration stage is continuously stirred by a stirrer.

After the aeration stage, the sedimentation stage progresses through the internal circulation stage, and the sedimentation stage is operated under anoxic conditions with the stirrer stopped. Hydrolysis and denitrification reactions of organic matter proceed through the precipitation step.

Once the sedimentation stage is completed, the discharge stage begins. In the discharge step, the supernatant water of each unit reaction tank, that is, the treated water, is discharged by the treated water discharge device 140. At the discharge stage, each unit reaction tank maintains anoxic and anaerobic conditions. Here, the lower part of the unit reaction tank where the MLSS is deposited is under anaerobic conditions, and the supernatant located at the top of the MLSS is under anoxic conditions. By supplying a carbon source during the discharge stage, denitrification and dephosphorization efficiency can be increased in the internal circulation stage and mixing stage after the discharge stage.

In this way, in each continuous batch unit reaction tank, the mixing stage, aeration stage, internal circulation outflow stage, sedimentation stage, discharge stage, and internal circulation inflow stage proceed sequentially, and as described above, internal circulation occurs between the aeration stage and the sedimentation stage. The steps progress. The period between the aeration stage and the precipitation stage of one unit reaction tank corresponds to the discharge stage and the mixing stage of the other unit reaction tank. That is, as described above, the process water from the unit reaction tank at the time when the aeration step is completed is supplied to another unit reaction tank where the discharge step is completed, which corresponds to the internal circulation step.

It has been described that denitrification efficiency is improved through internal circulation, because an effect corresponding to the internal return from the aerobic tank to the anoxic tank in the A2O process occurs. As described above, the aeration stage is a stage in which the nitrification process of ammonia nitrogen into nitrate nitrogen progresses, and the mixing stage following the discharge stage is a stage in which a denitrification reaction proceeds under anoxic conditions, thereby ending the aeration stage. If the process water from the unit reaction tank is supplied to another unit reaction tank after the discharge step is completed, the denitrification efficiency is improved during the mixing step under non-acid tank conditions in the other unit reaction tank.

In detail, there is a large amount of denitrifying microorganisms in the process water of the unit reaction tank whose aeration stage has been completed. Therefore, the amount of MLSS in the unit reactor supplied with process water whose aeration stage has been completed is increased, and the denitrification efficiency is improved during the mixing stage. , At the same time, nitrification efficiency is improved even during the aeration stage after raw water inflow. In this way, the amount of MLSS can be increased at once, so there is no need to additionally increase the residence time (HRT) or solids retention time (SRT) even under low water temperature or high concentration load inflow conditions.

Meanwhile, in the internal circulation stage, the operating conditions of each unit reaction tank are different. In other words, the operating conditions of the unit reaction tank in which the internal circulation outflow step is performed are different from the operating conditions of the unit reaction tank in which the internal circulation inflow step is performed. The unit reaction tank of the internal circulation inflow stage is operated under anoxic and anaerobic conditions in the same way as the discharge stage, which is the previous stage. On the other hand, the unit reaction tank in the internal circulation discharge stage can be operated under aerobic conditions or anoxic conditions depending on the concentration of organic matter in the raw water. If the organic matter concentration is high, which is higher than the preset standard concentration, the internal circulation outflow stage is operated under aerobic conditions as in the previous stage, the aeration stage. If the organic matter concentration is low, lower than the preset standard concentration, it is operated under anoxic conditions. In addition, when the organic matter concentration is high and the stirrer is operated under aerobic conditions, it is preferable that the stirrer is not operated, and when the organic matter concentration is low and the stirrer is operated under anoxic conditions, it is desirable to operate the stirrer (see Table 1).

In addition, when proceeding with the internal circulation step, that is, the internal circulation outflow step and the internal circulation inflow step, the process water of the unit reaction tank in which the internal circulation outflow step is performed is carried out in the internal circulation inflow step through the internal circulation pipes (111) (121). It is supplied to the unit reaction tank in which the internal circulation inflow stage is in progress. Since the water level of the unit reaction tank in which the internal circulation inflow stage is in progress has been lowered due to the discharge stage in the previous stage, the water level in both unit reaction tanks in the internal circulation outflow stage and the internal circulation inflow stage will be the same. It continues until. At this time, the internal circulation piping (111) (121) of the two unit reaction tanks is selectively connected and blocked by the opening/closing valve (130) as described above. At the end of the discharge stage, the water head difference between the two unit reaction tanks The opening/closing valve 130 may be opened. In addition, in order to minimize disturbance of the sludge layer deposited at the bottom of each unit reaction tank, the internal circulation pipes 111 and 121 are preferably installed at a location higher than the maximum height of the sludge layer. For reference, Figure 1 shows a state in which the first continuous batch unit reaction tank 110 is in the internal circulation outflow stage and the second continuous batch unit reaction tank 120 is in the internal circulation inflow stage. The first continuous batch unit reaction tank 110 It shows that the process water is supplied to the second continuous batch unit reaction tank 120 through the internal circulation pipes 111 and 121.

Raw water is supplied to each continuous batch unit reactor in the mixing stage. In addition to the mixing stage, raw water is also supplied to each continuous batch unit reactor in the internal circulation inflow stage. Looking at the time series, raw water is supplied in the internal circulation inflow stage and mixing stage, which occur after the discharge stage. On the other hand, raw water is not supplied to the unit reaction tank where the internal circulation outflow step is performed after the aeration step.

Table 1 below summarizes the reaction mechanism and operating conditions at each stage of the first continuous batch unit reactor (tank 1) and the second continuous batch unit reactor (tank 2) according to an embodiment of the present invention. Time, etc. are provided as examples for understanding of the invention.

As shown in Table 1 below, the end time of the abandonment phase of Group 1 coincides with the end time of the discharge phase of Group 2, and when the abandonment stage of Group 1 is completed, the internal circulation outflow stage proceeds in Group 1 and the internal circulation inflow occurs in Group 2. As the steps progress, 1 trillion won of process water is supplied to 2 trillion. In addition, when the abandonment stage of 2 sets and the discharge stage of 1 set are completed, the internal circulation outflow stage of 2 sets and the internal circulation inflow stage of 1 set proceed simultaneously, and the process water from 2 sets is supplied to 1 set. Raw water is supplied to each tank at the internal circulation inflow stage and mixing stage, and the reaction mechanisms at each stage of mixing, aeration, internal circulation outflow, sedimentation, discharge, and internal circulation inflow are the same as those summarized previously. In addition, in the internal circulation outflow stage, each tank can be operated under aerobic or anoxic conditions. As summarized above, in the case of relatively high concentration, aerobic conditions are maintained in the internal circulation outflow stage, and in the case of relatively low concentration, the internal circulation outflow stage. Operate under anaerobic conditions.

<Operating conditions and reaction mechanisms of groups 1 and 2> group 1 step Mix (30 minutes) Give up (70 minutes) internal circulation
Spill (20 minutes) Sedimentation (60 minutes) Discharge (40 minutes) internal circulation
Inflow (20 minutes) Raw water inflow ○ ○ stirring ○ X/○ aeration ○ ○/X condition Anaerobic exhalation Aerobic/anaerobic Anaerobic Anaerobic, Anaerobic Anaerobic, Anaerobic Action organic matter decomposition,
Denitrification, phosphorus release Organic matter oxidation, nitrification, phosphorus intake Organic matter hydrolysis,
Nitrogen decomposition, denitrification, phosphorus release organic matter decomposition,
Nitrogen decomposition, denitrification, phosphorus release Article 2 step Sedimentation (60 minutes) Discharge (40 minutes) internal circulation
Inflow (20 minutes) Mix (30 minutes) Give up (70 minutes) internal circulation
Spill (20 minutes) Raw water inflow ○ ○ stirring ○ X/○ aeration ○ ○/X condition Anaerobic Anaerobic, Anaerobic Anaerobic, Anaerobic Anaerobic exhalation Aerobic/anaerobic Action Organic matter hydrolysis,
Nitrogen decomposition, denitrification, phosphorus release organic matter decomposition,
Nitrogen decomposition, denitrification, phosphorus release organic matter decomposition,
Denitrification, phosphorus release Organic matter oxidation, nitrification, phosphorus intake

110: First continuous batch unit reaction tank 111, 121: Internal circulation piping
120: First continuous batch unit reaction tank 130: Open/close valve
140: treated water discharge device 150: diffuser
160: raw water supply pipe 170: raw water distribution tank

Claims (8)

The 1st continuous batch unit reaction tank (hereinafter referred to as 'tank 1') and the 2nd continuous batch unit reaction tank in which the mixing stage, aeration stage, internal circulation outflow stage, sedimentation stage, discharge stage, and internal circulation inflow stage are carried out in time series with time differences, respectively. It consists of a continuous batch unit reaction tank (hereinafter referred to as 'tank 2'),
A continuous batch water treatment device capable of internal circulation, characterized in that the process water from the tank in which the internal circulation outflow step is performed is supplied to the tank in which the internal circulation inflow step is performed.
According to claim 1, the internal circulation outflow stage of either group 1 or group 2 is carried out at the same time as the internal circulation inflow stage of the other group,
A continuous batch water treatment device capable of internal circulation, characterized in that the end time of the aeration stage of one group coincides with the end time of the discharge stage of the other group.
According to claim 1, the process proceeds in the following order: mixing stage, aeration stage, internal circulation outflow stage, sedimentation stage, discharge stage, and internal circulation inflow stage,
Group 2 is a continuous batch water treatment device capable of internal circulation, characterized in that the process proceeds in the following order: sedimentation stage, discharge stage, internal circulation inflow stage, mixing stage, aeration stage, and internal circulation outflow stage.
The continuous batch water treatment device capable of internal circulation according to claim 1, wherein in tank 1 or tank 2, the internal circulation inflow step that proceeds after the discharge step is operated under anoxic and anaerobic conditions.
The continuous batch water treatment device capable of internal circulation according to claim 1, wherein in the 1st or 2nd tank, the internal circulation discharge step that proceeds after the aeration step is operated under aerobic or anoxic conditions.
According to claim 5, if the concentration of organic matter in the raw water is high, which is higher than the preset standard concentration, the internal circulation outflow step is operated under aerobic conditions, and if the organic matter concentration is low than the preset standard concentration, the internal circulation outflow step is operated under anoxic conditions. A continuous batch water treatment device capable of internal circulation, characterized in that:
According to claim 1, internal circulation pipes provided in Articles 1 and 2, respectively,
It further includes an opening/closing valve that selectively connects or blocks the internal circulation pipes of Group 1 and Group 2,
A continuous batch water treatment device capable of internal circulation, characterized in that the process water from the tank where the internal circulation outflow step is performed is supplied to the tank where the internal circulation inflow step is performed through internal circulation piping and an open/close valve.
The continuous batch water treatment device capable of internal circulation according to claim 1, wherein raw water is supplied in the internal circulation inflow stage and the mixing stage that occur after the discharge stage.

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