KR102502856B1 - Waste water treatment system with enhanced denitrification structure - Google Patents

Abstract

The present invention relates to a sewage/wastewater treatment system having an enhanced denitrification structure, which is characterized by comprising: a pretreatment chamber (20) which causes nitrification in raw water flowing through a sedimentation tank (10); a first denitrification unit (30) which is connected to form a one-sided treatment path in the pretreatment chamber (20) and causes denitrification by sulfur contact; a second denitrification unit (40) which is connected to form an other-sided treatment path in the pretreatment chamber (20) and causes denitrification with a microbial carrier (45); and a controller (50) which controls the pretreatment unit (20), the first denitrification unit (30), and the second denitrification unit (40) using a set algorithm. Accordingly, in the process of treating sewage and wastewater through a series of processes, conditions for a denitrification process are quickly and accurately adjusted in response to a situation in which properties of raw water change. Therefore, the flexibility and reliability of the system can be improved.

Description

Waste water treatment system with enhanced denitrification structure}

The present invention relates to a sewage treatment system, and more particularly, to a sewage treatment system having a denitrification strengthening structure that induces sanitary purification of sewage and sewage through a series of processes.

Various types of wastewater, including sewage and sewage, generated in toilets, kitchens, and bathrooms in the course of daily life are discharged or recycled after appropriate treatment in accordance with relevant laws and regulations. In the process of advanced wastewater treatment, denitrification and dephosphorization processes are essential to prevent eutrophication in water. In general, the reaction tank in the process for removing nitrogen and phosphorus includes an anoxic tank required for denitrification, an anaerobic tank for phosphorus release, and an aerobic tank for nitrification/phosphorus absorption/decomposition of organic matter.

Korean Patent Registration No. 0433259 (Prior Document 1) and Korean Patent Registration No. 1332849 (Prior Document 2) are known as prior art documents that can be referred to in this regard.

Prior Document 1 promotes the activity of microorganisms by introducing a part of the settling tank into a BAR (microbial activating tank), and then selecting one of NAR (nitrifying microorganism activating tank), a nitrifying tank with a carrier, a nitrifying tank with a membrane, and a phosphorus absorption tank. do. Accordingly, it is expected to improve treatment efficiency by separating microorganisms in a single process, and to reduce the ease of operation and initial installation cost.

Prior Document 2 is installed in a primary filtration unit for filtering the inflowing sewage, a reaction tank for performing nitrification and denitrification of the inflowing sewage, an electrolysis unit that is installed in the reaction tank and treats nitrogen and phosphorus in the inflowing sewage, and discharged from the reaction tank. It includes a secondary filtration unit for filtering sewage. Accordingly, the effect of maintaining a constant removal efficiency of pollutants in sewage, particularly nitrogen and phosphorus, is expected.

However, according to the above prior literature, improvement is required in that it is insufficient to flexibly adjust the denitrification process conditions to correspond to the change in physical properties of raw water (wastewater).

Korean Registered Patent Publication No. 0433259 "Method for treating sewage using sewage treatment system including microorganism activation tank" (published date: .2004.03.31) Korean Patent Registration No. 1332849 "Nitrogen and phosphorus treatment device and sewage treatment method using the same" (Publication date: 2013.11.27.)

The purpose of the present invention to improve the above conventional problems is to rapidly change the denitrification process conditions in response to the situation in which the physical properties of incoming raw water fluctuate in the process of inducing sanitary purification of sewage through a series of processes. It is to provide a sewage treatment system with a denitrification reinforcement structure to accurately fit the structure.

In order to achieve the above object, the present invention provides a sewage treatment system having an enhanced denitrification function: a pretreatment tank for causing nitrification of raw water flowing through a sedimentation tank; a first denitrification unit connected to the pretreatment tank to form a treatment path on one side and causing denitration by sulfur contact; a second denitrification unit connected to the pretreatment tank to form the other treatment path and inducing denitrification to the microbial carrier; and a controller for controlling the pretreatment tank, the first denitration unit, and the second denitration unit using a set algorithm.

As a detailed configuration of the present invention, the pretreatment tank is characterized in that the fixed blade and the movable blade are arranged adjacently to induce refinement of the raw water solid content.

As a detailed configuration of the present invention, the pretreatment tank is characterized in that it further includes a bubble remover in a conduit for discharging raw water.

As a detailed configuration of the present invention, the first denitrification unit is characterized by having a temperature controller connected to the reaction tank, a limestone supplier, and a carbon source supplier.

As a detailed configuration of the present invention, the second denitrification unit is characterized by having a temperature controller connected to the reaction tank, a pH controller, and a variable cylinder accommodating the microbial carrier.

As a detailed configuration of the present invention, the variable cylinder is characterized in that it is supported so as to be able to move up and down on one side and the other guide rail to enable alternate input.

As a detailed configuration of the present invention, the guide rail is characterized in that it is installed to induce a change in the opening rate of the ventilation hole in response to the elevation position of the variable cylinder body.

As a detailed configuration of the present invention, the controller is characterized in that it includes an algorithm for determining the output of the flow path switching valve and/or the motion actuator in response to input signals from the BOD measuring device, the MLSS measuring device, the ORP measuring device, and the carrier measuring device.

As described above, according to the present invention, in the process of treating sewage water through a series of processes, the process conditions for denitrification are quickly and accurately matched in response to the situation in which the physical properties of the incoming raw water fluctuate, thereby improving the flexibility and reliability of the system. It works.

1 is a schematic diagram showing the main parts of the system according to the present invention
Figure 2 is a schematic diagram showing a second denitrification unit of the system according to the present invention
Figure 3 is a schematic view showing the operating state of the microorganism carrier of Figure 2
4 is a block diagram showing a control circuit of a system according to the present invention;

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

The present invention proposes a wastewater treatment system having a structure with enhanced denitrification function. Sewage treatment including manure, livestock wastewater, factory wastewater, and domestic sewage is targeted, but is not necessarily limited thereto. In the process of advanced treatment of wastewater (sewage), the main point is to improve the denitrification-related function in a series of processes to prevent eutrophication in rivers and lakes.

According to the present invention, the pretreatment tank 20 has a structure inducing nitrification of raw water flowing through the precipitation tank 10.

Referring to FIG. 1, a state in which the pretreatment tank 20 is connected to the downstream side of the precipitation tank 10 is shown. The sedimentation tank 10 collects contaminants and the like included in raw wastewater downwardly and generates supernatant water upwardly. The pretreatment tank 20 converts organic nitrogen or ammonia nitrogen present in raw water into nitrate nitrogen through a nitrification reaction. The pretreatment tank 20 includes a blower 25 connected to a ceramic nozzle and a blower adjacent to the bottom. In addition, since the growth rate of nitrifying bacteria in the nitrification process depends on the temperature, a temperature controller is provided to maintain the temperature of the pretreatment tank 20 in the range of 30 to 35 ° C.

As a detailed configuration of the present invention, the pretreatment tank 20 is characterized in that the fixed blade 21 and the movable blade 22 are arranged adjacently to induce refinement of the raw water solid content.

1, fixed blades 21 and movable blades 22 constituted in the pretreatment tank 20 are shown. The fixed blades 21 are attached to the inner wall of the pretreatment tank 20 at regular intervals, and the movable blades 22 are rotatably mounted at the center of the pretreatment tank 20 . In addition to the function of rotating the movable blades 22, the wing actuator 23 may also have functions such as acidification and pH control. The fixed blades 21 and the movable blades 22 may be arranged to form a plurality of layers vertically. When the solid content of the raw water is refined by the fixed blades 21 and the movable blades 22, it is advantageous for the nitrification reaction by the growth of nitrifying bacteria.

As a detailed configuration of the present invention, the pretreatment tank 20 is characterized in that a bubble remover 27 is further provided in a pipe line for discharging raw water.

In FIG. 1, a state in which the bubble remover 27 is installed in the downstream pipe of the pretreatment tank 20 is shown. A large amount of bubbles may be generated in the raw water during the agitation and aeration treatment of the pretreatment tank 20 . Air bubbles reduce the efficiency of the subsequent denitrification reaction and are therefore preferably removed. The air bubble remover 27 may employ a porous blade and/or air hole pipe method. In any case, the bubble remover 27 has a structure that suppresses the turbulence of the raw water to be transferred.

Thereafter, the raw water discharged from the pretreatment tank 20 undergoes a denitrification reaction in which nitrate nitrogen is converted into nitrogen gas in an anoxic state through one of two treatment paths. Influencing factors of denitrification are known, such as incubation temperature, pH, alkalinity, dissolved oxygen, C/N ratio, and type of carbon source. In general, when organic matter, nitrogen, and phosphorus are 100: 5: 1, the efficiency of pollutant removal by the growth and reproduction of microorganisms increases.

In addition, according to the present invention, the first denitrification unit 30 that induces denitrification by sulfur contact is connected to the pretreatment tank 20 to form a treatment path on one side.

1 shows a state in which the first denitration unit 30 is disposed in one treatment path of the pretreatment tank 20 . When the concentration of organic matter in raw water is relatively low compared to the concentration of nitrogen, it passes through the first denitrification unit 30 having a relatively simple structure. Of course, control for measuring organic matter (BOD), total nitrogen (T-N), total phosphorus (TP), etc. is accompanied as described below for automation of the denitrification process.

As a detailed configuration of the present invention, the first denitrification unit 30 is characterized by having a temperature controller 32 connected to the reaction tank 31, a limestone supplier 33, and a carbon source supplier 35.

The first denitrification unit 30 induces a denitrification reaction of nitrate nitrogen by injecting sulfur particles and limestone into the reaction tank 31 into which raw water containing relatively low BOD is introduced. Sulfur acts as an electron donor and a carrier on which microorganisms can adhere. The temperature controller 32 maintains the temperature of the reaction vessel 31 in a range favorable to the reaction of autotrophic microorganisms (such as Thiobacillus denitripicans) using sulfur. The limestone feeder 33 neutralizes hydrogen ions generated in the denitrification reaction to adjust the appropriate alkalinity (pH 6.5 to 8.0). The limestone feeder 33 may be configured as a line mixer to simultaneously inject sulfur particles. The carbon source supplier 35 provides a commercially available external carbon source such as methanol, ethanol, or acetate. At least partially food waste. It can be replaced with sewage sludge, methane gas, manure, etc.

Meanwhile, a vortex generator 37 may be provided on the bottom surface of the reaction tank 31 of the first denitration unit 30 to increase reactivity.

In addition, according to the present invention, the second denitrification unit 40 for inducing denitrification to the microbial carrier 45 is connected to the pretreatment tank 20 to form the other treatment path.

1 shows a state in which the second denitration unit 40 is disposed in the other treatment path of the pretreatment tank 20 . The second denitrification unit 40 induces a denitrification reaction of nitrate nitrogen by injecting denitrification microorganisms into the reaction tank 41 into which raw water containing relatively high BOD is introduced. Bacillus, Pseudomonas, and Micrococcus are used as denitrifying microorganisms accommodated in the microbial carrier 45 . The second denitrification unit 40 is preferably based on a Sequencing Batch Reactor (SBR), but is not limited thereto. If SBR and intermittent inflow are applied, it is advantageous to reduce the area required for the site and handle the shock load.

As a detailed configuration of the present invention, the second denitrification unit 40 is provided with a temperature controller 42 connected to the reaction tank 41, a pH controller 43, and a variable cylinder 46 accommodating a microbial carrier 45. It is characterized by doing.

Conditions for the denitrification process in the second denitrification unit 40 may be set to dissolved oxygen (DO) of 0 to 2 mg/L, pH of 6.5 to 7.5, and temperature of 35 to 50°C. The temperature controller 42 is evenly disposed on the front of the reaction tank 41, but particularly increases the density around the variable cylinder 46. The pH controller 43 adjusts the alkalinity of the denitrification reaction by injecting chemicals such as pH adjusters. In addition, the carbon source supplier 35 of the first denitration unit 30 may be applied. It is preferable to use a variable cylinder 46 as the microorganism carrier 45 to control the reactivity of denitrifying microorganisms. The microorganism carrier 45 may be configured based on a porous structure similar to that of a Pall-Ring.

As a detailed configuration of the present invention, the variable tubular body 46 is characterized in that it is supported so as to be able to move up and down on one side and the other guide rail 47 so that alternate injection is possible.

Referring to FIG. 2 , the installation state of the variable cylinder 46 is shown on one side and the other side of the reaction tank 41 . As shown in FIG. 2 (a), the variable cylinder 46 is mounted on the guide rail 47 and moved up and down to an appropriate position by the motion actuator 48. The motion actuator 48 can be applied by selecting from a rope-drum method, a chain conveyor method, and the like. As shown in FIG. 2 (b), the pair of deformable cylinders 46 are supported by two guide rails 47 arranged in a V shape. One side deformable cylinder 46 moves up and down along one side guide rail 47 and the other side deformable cylinder 46 moves up and down along the other side guide rail 47 . Reference numeral 46' denotes a state before the variable cylinder 46 moves up and down. According to such a structure, it is easy to inspect and replace the microorganism carrier 45 immediately when an abnormality occurs or the service life is reached.

On the other hand, the reaction tank 41 is provided with a separate openable and openable local cover (not shown) for exposure of the top of the guide rail 47 and entry and exit of the variable cylinder 46.

As a detailed configuration of the present invention, the guide rail 47 is characterized in that it is installed to cause a change in the opening rate of the ventilation hole in response to the elevation position of the variable cylinder 46.

Referring to FIG. 3 , a state in which the deformable cylinder 46 is expanded or contracted according to an elevated position is shown. Reference numeral 46A denotes an inner cylinder, 46B an outer cylinder, and 46C a ventilation hole formed in the inner cylinder. The variable cylinder 46 has a telescopic structure by an inner cylinder and an outer cylinder. As shown in FIG. 3 (a), when the variable cylinder 46 is located at the upper end of the guide rail 47, all ventilation holes are concealed, and as shown in FIG. 3 (b), the variable cylinder 46 is located at the lower end of the guide rail 47 Doing so exposes all vents. The reactivity of the microorganism carrier 45 accommodated therein varies according to the change in the opening rate of the ventilation hole.

In addition, according to the present invention, the controller 50 controls the pretreatment tank 20, the first NOx removal unit 30, and the second NOx removal unit 40 according to a set algorithm.

Referring to FIGS. 1 and 4 , a state in which the controller 50 is composed of a microcomputer circuit is shown. The controller 50 has a microprocessor, memory, input/output interface and is connected to the driving unit. The output interface of the controller 50 and the driving unit are connected to the blade driver 23, the blower 25, the temperature controllers 32 and 42, the motion actuator 48, and the flow change valve 57. The algorithms of the controller 50 are stored in the form of programs and data in memory and executed by the microprocessor.

As a detailed configuration of the present invention, the controller 50 controls the flow path switching valve 57 and / or an algorithm for determining the output of the motion actuator 48.

4 shows a state in which the BOD measuring device 51, the MLSS measuring device 52, the ORP measuring device 53, and the carrier measuring device 55 are connected to the input interface of the controller 50. The BOD meter 51 indirectly measures the amount of organic matter through a change in dissolved oxygen (DO) concentration in the precipitation tank 10, the pretreatment tank 20, and the like. The MLSS measuring device 52 measures the suspended matter of the activated sludge and/or the mixed solution of the aeration tank in the pretreatment tank 20. The ORP measuring device 53 measures physical quantities related to the reaction in terms of oxidation reduction potential (mV) in the pretreatment tank 20, the first denitrification unit 30, the second denitration unit 40, and the like. The carrier measuring device 55 measures a physical quantity (concentration) related to the reactivity of microorganisms in the first denitrification unit 30 and the second denitrification unit 40. Although not shown, a temperature sensor, a pH sensor, an ammonium sensor, etc. are basically mounted, and in addition, a sensor and a camera for directly detecting a specific component may be mounted.

As an example of automated control by the controller 50, the organic matter/nitrogen concentration of the raw water flowing from the precipitation tank 10 through the pretreatment tank 20 is determined, and the first denitration unit 30 ) or the second denitration unit 40, the processing path is switched, the subroutine program set in each processing path is executed for feedback control, and an audible and visual alarm is generated when an abnormality occurs in each process.

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such variations or modifications should fall within the scope of the claims of the present invention.

10: sedimentation tank 20: pretreatment unit 21: fixed wing
22: movable wing 23: wing actuator 25: blowing machine
27: bubble remover 30: first denitrification unit 31: reaction tank
32: temperature controller 33: limestone feeder 35: carbon source feeder
37: vortex generator 40: second denitrification unit 41: reaction tank
42: temperature controller 43: pH controller 45: microorganism carrier
46: variable body 47: guide rail 48: motion actuator
50: controller 51: BOD meter 52: MLSS meter
53: ORP meter 55: carrier meter 57: flow path switching valve

Claims (8)

In the sewage treatment system with enhanced denitrification function:
A pretreatment tank 20 for causing nitrification of the raw water introduced through the precipitation tank 10;
a first denitration unit 30 connected to the pretreatment tank 20 to form a treatment path on one side and causing denitration by sulfur contact;
a second denitrification unit 40 connected to the pretreatment tank 20 to form the other treatment path and inducing denitrification to the microbial carriers 45; and
A controller 50 controlling the pretreatment tank 20, the first NOx removal unit 30, and the second NOx removal unit 40 with a set algorithm;
The first denitrification unit 30 includes a temperature controller 32 connected to the reaction tank 31, a limestone supplier 33, and a carbon source supplier 35,
The second denitrification unit 40 includes a temperature controller 42 connected to the reaction tank 41, a pH controller 43, and a variable cylinder 46 accommodating a microorganism carrier 45, and the variable cylinder 46 Is a telescopic structure in which the outer surface of the inner cylinder having a ventilation hole is slidably wrapped with two outer cylinders,
The variable cylinder 46 is supported so as to be able to move up and down on guide rails 47 on one side and the other side so that alternate input is possible,
The guide rails 47 are arranged to face each other in a V shape, and are installed to induce a change in the opening rate of the ventilation hole in response to the elevation position of the variable cylinder 46, and the variable cylinder 46 is attached to the guide rail 47. Sewage treatment system with a denitrification strengthening structure, characterized in that the total opening rate of the ventilation hole formed on the surface of the inner cylinder is varied by moving the two outer cylinders sideways while being raised and lowered by the. The method of claim 1,
The pretreatment tank (20) is sewage treatment system with a denitrification strengthening structure, characterized in that by arranging the fixed blades (21) and the movable blades (22) adjacently to induce miniaturization of the raw water solids. The method of claim 1,
The sewage treatment system of the denitrification strengthening structure, characterized in that the pretreatment tank (20) further includes a bubble remover (27) in a pipe line for discharging raw water. delete delete delete delete The method of claim 1,
The controller 50 controls the first NOx removal unit 30 or the second NOx removal unit 40 in the preprocessor 20 in response to the input signals of the BOD meter 51, the MLSS meter 52, and the ORP meter 53. Characterized in that it includes an algorithm for determining the output of the flow path switching valve 57 for switching the processing path of and / or the motion actuator 48 for lifting the variable cylinder 46 in a rope-drum method or a chain conveyor method. Sewage treatment system with enhanced denitrification structure.

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