KR20040083044A - Advanced wastewater treatment method using reactor-regulated raw water storage tank - Google Patents

Abstract

PURPOSE: To supply raw wastewater into a sequencing batch reactor (SBR) from a flow equalization tank when carbon source being depleted in the SBR at anoxic stage, by communicating the flow equalization basin with the SBR via hydraulic pipeline, thereby increasing denitrification efficiency. CONSTITUTION: The method comprises steps of a raw water supplying step operating a pump(13) by a control device(12) to supply raw water in a flow equalization tank(10) to an SBR(20); an anaerobic step stopping the operation of the pump by the control device when the water level of the flow equalization tank reaches to a medium water level (MWL) and keeping the SBR at an anaerobic state; an aerating step aerating the SBR; a carbon source supply step stopping the aeration of the SBR and operating the pump by the control device; an anoxic step stopping the operation of the pump by the control device when the water level of the flow equalization tank reaches to a low water level (LWL) and keeping the SBR at an anaerobic state; and a settling step decanting supernatant in the SBR and removing settled sludge.

Description

Advanced wastewater treatment method using reactor-regulated raw water storage tank

The present invention, in the sewage altitude treatment method, by connecting the flow control tank and the reaction tank with a pump, and installed a water level meter for measuring the level of the flow control tank and a control device for controlling the pump according to the level of the flow control tank and the state of the reaction tank, By adjusting the raw water supply according to the treatment stage of the will maximize the treatment efficiency.

Advanced sewage treatment refers to sewage treatment that treats not only organic contaminants in sewage but also nutrients such as nitrogen (N) and phosphorus (P). It is generally used to control denitrification and microorganisms by controlling oxygen in sewage. This is done in a way that induces dephosphorization.

Since the amount of sewage is changed according to seasonal or temporal factors, it is impossible to maintain a constant amount of sewage inflow to the sewage treatment facility itself. Therefore, as shown in FIG. ), A flow rate adjusting tank 10 for first storing the introduced sewage is installed.

Raw water introduced into the reaction tank 20 through the flow adjustment tank 10 is basically nitrogen and phosphorus (P) is removed through the process as shown in Figure 2 and 3 attached, the final purification The treated supernatant is discharged to rivers or seas, and the sludge deposited is disposed of or recycled.

Such a brief description of the biological sewage treatment process of Figure 2 as follows.

First, the removal process of phosphorus (P), the sewage is first introduced into the reactor 20 and goes through the anaerobic tank step (S10) that is maintained in a state that does not aeration, wherein the microorganisms in the reactor 20 is phosphorus (P) In the aeration tank stage (S20) which aeration of the sewage in this state, the microorganisms are activated, and the intake of phosphorus in the sewage is overtaken and multiplied. P) is removed.

Anoxic tank comprising: ;, and stop the aeration in this state (S30 ^- Looking at the process of elimination of nitrogen (N), sewage when the aerobic condition at an aeration tank step (S20) of ammonia (NH ₄₎ is oxidized nitrate (NO ₃₎ In the), as the oxygen of the nitrate is collected by the microorganism, the nitrate is vaporized with nitrogen (N ₂ ) to be denitrified, and then sludge is formed through physical precipitation in the settling tank step (S40). Will be removed.

As such, the biological sewage treatment process is based on anaerobic tank stage (S10), aeration tank stage (S20), anaerobic tank stage (S30), and sedimentation tank stage (S40). In order to cope with the type of each step, the reaction conditions 20 for each treatment step may be separately configured in each treatment step, or one reaction tank 20 may be aerated intermittently to satisfy the reaction conditions for each step.

In particular, by operating the reactor 20 in aeration or anaerobic cycle periodically, one reactor 20 to perform the entire process of biological sewage altitude treatment by reducing the required site of the sewage treatment facility Sequencing Batch Reactor (SBR) is widely used in small and medium sized treatment facilities.

In the biological sewage treatment process, a temporary storage tank called a flow regulating tank 10 is formed as a preliminary stage of the reaction tank 20 in which a full-scale treatment process is generally performed, and the sewage raw water of irregular flow rate flowing from the collecting pipe passage is temporarily stored. Is supplied at a constant flow rate or total amount in accordance with the capacity and processing speed of the sewage treatment facility, the raw water of a predetermined level or more in the flow rate adjustment tank (10) or natural artificial flow or by artificially pumping the reaction tank (20) To be supplied.

That is, the raw water supply from the flow rate adjustment tank 10 is made of only the sewage to be treated in the reaction tank 20 of the anaerobic tank step S10, which is the first step of the biological sewage altitude treatment process. Only the incoming raw water will proceed with the entire reaction.

Therefore, in the anoxic tank stage (S30), that is, the final stage of the nutrient removal reaction except for the physical treatment process, that is, the denitrification stage, the carbon source, which is one of the main reaction factors as the energy source of the microorganism, is exhausted. There is no additional supply from the carbon source, which leads to a lack of carbon sources and a lack of smooth denitrification, especially in medium and small municipal sewage, where carbon content is relatively low compared to nitrogen. There were many difficulties in the operation of the treatment facility.

The present invention has been made in view of the above-described problems, and the flow control tank and the reaction tank is connected to the pump, and a water level meter for measuring the level of the flow adjustment tank and a control device for controlling the pump according to the level of the flow control tank and the state of the reaction tank is installed. Thus, the denitrification reaction is promoted by supplying an external carbon source through a predetermined amount of raw water supply to the reaction tank in the anaerobic tank stage as well as the anaerobic tank stage.

In addition, after the anoxic tank stage in which raw water is supplied from the flow adjusting tank, the reactor is operated again as an aeration tank stage, so that a small amount of phosphorus (P) contained in the additionally introduced raw water can be removed, thereby reducing the overall treatment effect. It is to improve the denitrification efficiency.

Figure 1 is a schematic diagram of a conventional sewage treatment tank and flow adjustment tank

Figure 2 is a schematic diagram of a conventional biological sewage treatment process

3 is a flow chart of a conventional biological sewage treatment process

Figure 4 is a schematic view of the reaction tank and flow rate adjustment tank in the present invention

5 is a flow chart of the high sewage treatment process of the present invention

Figure 6 is a water tank state diagram for each step of the advanced sewage treatment process of the present invention

7 is a flowchart illustrating an embodiment of the present invention in which the aeration tank step is repeated.

<Code Description of Main Parts of Drawing>

10: flow adjustment tank

11: water gauge

12: controller

13: pump

14: suction pipe

20: reactor

21: supply pipe

S09: Raw water supply stage

S10: anaerobic tank stage

S20: Aeration stage

S29: carbon source supply stage

S30: Anaerobic Digestion Stage

S40: sedimentation tank stage

Detailed configuration and processing of the present invention will be described below with reference to the accompanying drawings.

First, the sewage advanced treatment facility for carrying out the present invention is a suction pipe connecting the flow rate adjustment tank 10 and the reaction tank 20, the flow rate adjustment tank 10, and the reaction tank 20 in which the water level gauge 11 is installed ( 14, the pump 13 and the supply pipe 21, and connected to the water level meter 11, the pump 13 and the reaction tank 20, depending on the level of the flow control tank 10 and the state of the reaction tank 20 (13) It consists of a control device 12 for controlling the operation of the).

The water gauge 11 installed in the flow regulating tank 10 can be applied to various methods such as subsidiary, ultrasonic, and the like, and a control device 12 that can be used as an example of a programmable logic controller (PLC) is provided. Although it may be configured separately from the controller for the reaction tank 20 for controlling the operation state of the reaction vessel 20, or may be configured in various ways, such a type and configuration method of the level gauge 11 or the control device 12. According to the conditions and the size of the facility it is a matter that can be selected by those of ordinary skill in the art to which the present invention belongs, it does not have a specific limitation to this in the claims.

Sewage altitude treatment process according to the present invention will be described step by step as follows.

As shown in FIGS. 5 and 6, the pump 13 is operated by the control device 12 while the water level of the flow regulating tank 10 is at a predetermined water level HWL, and the raw water sucked through the suction pipe 14 is operated. The pressure is supplied to the reactor 20 through the supply pipe (21).

When the water level of the flow rate adjustment tank 10 reaches a predetermined water level (MWL), the operation of the pump 13 by the control device 12 is stopped, the reaction tank 20 is maintained in a non-aerated state, wherein the microorganism Phosphorus (P) elution is made.

Thereafter, the reaction tank 20 is operated in an aerated state, nitrate is generated due to oxidation of ammonia and phosphorus (P) excess ingestion of microorganisms, and eventually phosphorus is removed.

After the dephosphorization reaction is made, the aeration of the reaction tank 20 is stopped and the pump 13 is operated again, and the raw water of the flow adjusting tank 10 is supplied to the reaction tank 20 again. It acts as a carbon source of the microorganisms, and thus the microorganisms supplied with the external carbon source are further activated to improve the denitrification efficiency.

When the water level of the flow rate adjustment tank 10 reaches the predetermined water level (LWL), the pump 13 is stopped and the reaction tank 20 is kept in a non-aerated state. Nitrogen vaporization and denitrification are achieved.

Subsequently, the purified supernatant of the upper part of the reaction tank 20 is collected and discharged into a river or the sea, and sludge deposited in the lower part is collected and disposed of or returned to the treatment facility through a disposal pipe or the like. It will be made or recycled into construction materials.

On the other hand, in the present invention, as shown in Figure 7, in order to remove the phosphorus (P) contained in the small amount of raw water supplied again for the carbon source supply, the reaction tank 20 to the aeration state again before the supernatant intake and sedimentation sludge removal It can also be operated, thereby improving the denitrification efficiency without degrading the overall treatment effect, including the removal effect of phosphorus.

As a result, the technical gist of the present invention is a method for treating sewage altitude through a sewage altitude treatment facility configured with a reaction tank 20 in which biological treatment of sewage is performed and a flow rate adjusting tank 10 for storing the introduced sewage raw water and supplying it to the reaction tank 20. In the flow rate adjustment tank 10, a water level gauge 11 for measuring the level of stored raw water is provided, and the flow rate adjustment tank 10 is a reaction tank 20 through a suction pipe 14, a pump 13, and a supply pipe 21. Is connected to the water level meter 11, the pump 13, and the reaction tank 20 according to the level of the water level adjusting tank 10 read through the water level meter 11 and the state of the reaction tank 20. The control device 12 for controlling the operation of the 13 is connected, the control device 12 operates the pump 13 to supply the raw water in the flow regulating tank 10 to the reaction tank 20 (S09) When the level of the flow rate adjusting tank 10 reaches the predetermined level MWL, the control device 12 stops the operation of the pump 13 Anaerobic tank step (S10) for maintaining the tank 20 in a non-aerated state, aeration step (S20) that the reaction tank 20 is aerated, aeration of the reaction tank 20 is stopped, the pump by the control device 12 When the carbon source supply step (S29) (13) is operated and the water level of the flow adjusting tank 10 reaches the predetermined water level (LWL), the control device 12 stops the operation of the pump 13, the reaction tank 20 An anaerobic tank stage (S30) that is maintained in a non-aerated state, and the sewage altitude treatment method using a reactor-linked flow control tank, characterized in that the supernatant in the reaction tank 20 is discharged and the sedimentation sludge is removed (S40), Or raw water supply step (S09), anaerobic tank step (S10), aeration step (S20), carbon source supply step (S29), anoxic tank step (S30), aeration step (S20), anoxic tank step (S30) And, sewage altitude treatment method using a reactor-linked flow control tank, characterized in that consisting of a settling tank step (S40).

Through the present invention, effective sewage treatment is possible even under inconsistent flow rate of sewage, and in particular, it is possible to obtain a significantly improved denitrification effect, thereby improving the operational efficiency of the sewage treatment facility. In addition, the cost of sewage treatment and environmental pollution prevention can be achieved.

Claims (2)

In the sewage altitude treatment method through the sewage altitude treatment facility is configured with a reaction tank 20 is a biological treatment of sewage and a flow rate adjustment tank 10 for storing the introduced sewage raw water and supplying it to the reaction tank 20, The flow rate adjusting tank 10 is provided with a water level gauge 11 for measuring the level of raw water stored, and the flow rate adjusting tank 10 is connected to the reaction tank 20 through the suction pipe 14, the pump 13, and the supply pipe 21. The level gauge 11, the pump 13, and the reaction tank 20 control the operation of the pump 13 according to the level of the flow rate adjusting tank 10 read through the level gauge 11 and the state of the reaction tank 20. The control device 12 is connected; A raw water supply step (S09) in which the control device 12 operates the pump 13 to supply the raw water in the flow rate adjusting tank 10 to the reaction tank 20; An anaerobic tank step (S10) for stopping the operation of the pump 13 and maintaining the reactor 20 in a non-aerated state when the water level of the flow rate adjusting tank 10 reaches a predetermined water level (MWL); An aeration step (S20) in which the reactor 20 is aerated; Aeration of the reactor 20 is stopped, and a carbon source supply step (S29) in which the pump 13 is operated by the control device 12; When the water level of the flow rate adjustment tank 10 reaches the predetermined water level (LWL), the control device 12 stops operating the pump 13, the reaction tank 20 is an anaerobic tank step (S30) is maintained in a non-aerated state; Sewage altitude treatment method using a reactor-linked flow control tank, characterized in that the supernatant in the reaction tank 20 is discharged and the sedimentation sludge is made of a settling tank step (S40). In the sewage altitude treatment method through the sewage altitude treatment facility is configured with a reaction tank 20 is a biological treatment of sewage and a flow rate adjustment tank 10 for storing the introduced sewage raw water and supplying it to the reaction tank 20, The flow rate adjusting tank 10 is provided with a water level gauge 11 for measuring the level of raw water stored, and the flow rate adjusting tank 10 is connected to the reaction tank 20 through the suction pipe 14, the pump 13, and the supply pipe 21. The level gauge 11, the pump 13, and the reaction tank 20 control the operation of the pump 13 according to the level of the flow rate adjusting tank 10 read through the level gauge 11 and the state of the reaction tank 20. The control device 12 is connected; A raw water supply step (S09) in which the control device 12 operates the pump 13 to supply the raw water in the flow rate adjusting tank 10 to the reaction tank 20; An anaerobic tank step (S10) for stopping the operation of the pump 13 and maintaining the reactor 20 in a non-aerated state when the water level of the flow rate adjusting tank 10 reaches a predetermined water level (MWL); An aeration step (S20) in which the reactor 20 is aerated; Aeration of the reactor 20 is stopped, and a carbon source supply step (S29) in which the pump 13 is operated by the control device 12; When the water level of the flow rate adjustment tank 10 reaches the predetermined water level (LWL), the control device 12 stops operating the pump 13, the reaction tank 20 is an anaerobic tank step (S30) is maintained in a non-aerated state; An aeration step (S20) in which the reactor 20 is aerated; An anoxic tank stage in which the reactor 20 is maintained in a non-aerated state (S30); The supernatant in the reactor 20 is discharged and sewage altitude treatment method using a reactor-linked flow rate adjustment tank, characterized in that consisting of a settling tank step (S40) is removed.