KR20170130738A - Wastewater treatment system - Google Patents

Abstract

The present invention relates to a wastewater treatment system using microorganism mixed bacteria, comprising: a screen tank for pretreating impurities and suspended matter contained in wastewater; a flow rate adjustment tank for controlling a flow rate of wastewater passing through the screen tank; a first metering tank for injecting a microbial activator into raw water introduced from the flow rate adjustment tank and mixing the same with return sludge; a rotary microorganism contact device in which a plurality of net-type rotary microorganism contact bodies having a microbial film attached thereto are installed in a microorganism contact tank; a second metering tank connected to the rotary microorganism contact device, and injecting a microbial activator into raw water introduced from the rotary microorganism contact device and mixing the same with return sludge; a bioreactor having a plurality of reaction chambers for reacting treated water supplied from the second metering tank to remove untreated organic matter and nutritive salts; a bypass pipe branched from a transfer pipe connecting the flow rate adjustment tank and the first metering tank or a transfer pipe connecting the screen tank and the flow rate adjustment tank, and bypassing the raw water passing through the flow rate adjustment tank or the raw water passing through the screen tank to the second metering tank or the bioreactor; and a flow rate control means for controlling the amount of raw water injected into the rotary microorganism contact device and the amount of bypass through the bypass pipe. According to the present invention, it is possible to stably maintain the growth condition of microorganism mixed bacteria for the optimal removal efficiency of nutritive salts despite changes in the amount of processing load due to changes in the external environment.

Description

Wastewater treatment system {WASTEWATER TREATMENT SYSTEM}

The present invention relates to a wastewater treatment system for removing organic matter, nitrogen and phosphorus contained in wastewater by using microorganism mixed bacteria.

Nutrients contained in wastewater and organic wastewater, namely nitrogen and phosphorus, cause eutrophication and red tide on refined lakes and coastal waters.

Although the existing technology has achieved a considerable level of removal of organic and suspended matters contained in sewage and organic wastewater, the technology for removing nutrients such as nitrogen and phosphorus is insufficient, so that the facility cost and facility maintenance cost The process is also very complicated and difficult to operate, which is why we are avoiding the purification facilities of these methods.

According to the conventional wastewater treatment system using microorganism mixed bacteria, it is difficult to cope with the fluctuation of the treatment load (for example, organic matter and nutrients in the wastewater) depending on the external environmental change (temperature, precipitation amount, etc.) There is a problem that the growth conditions of microorganism mixed bacteria in the system fluctuate greatly. For example, in the rainy season and the summer season, the load of the wastewater is relatively reduced, resulting in a significant decrease in the number of microbial bacteria in the system, resulting in a significant reduction in the removal efficiency of nutrients.

Japanese Patent Application Laid-Open No. 8-57492 (Mar. 08, 1996)

The present invention provides a wastewater treatment system capable of stably maintaining a growth condition of microorganism mixed bacteria for optimum removal efficiency of nutrients despite the variation of treatment load due to external environment change .

In order to realize the above-described object, the present invention provides a water treatment system comprising a screen tank for pretreating contaminants and suspended substances contained in wastewater, a flow rate adjusting tank for adjusting a flow rate of the wastewater passing through the screen tank, A rotary microorganism contact device provided with a plurality of reticulated microorganism contact bodies each having a microorganism film attached thereto in the microorganism contact tank; and a second metering tank connected to the rotary microorganism contactor, A bioreactor having a plurality of reaction chambers for removing untreated organic substances and nutrients by reacting the treated water supplied from the second metering tank and the second metering tank for administering the microorganism activator; A transfer pipe for connecting the tank or the transfer tank for connecting the screen tank and the flow rate adjusting tank A bypass pipe for bypassing the raw water passing through the flow rate adjusting tank or the raw water passing through the screen tank to the second metering tank or the bioreactor, And a flow regulating means for regulating the amount of bypass through the wastewater treatment system.

According to the wastewater treatment system of the present invention, Bacillus species among the microorganism mixed bacteria can be ignited according to the components of the active agent and the operation method.

According to the wastewater treatment system of the present invention, the flow rate regulating means may include a first flow rate regulating valve and a second flow rate regulating valve respectively installed in the transfer pipe and the bypass pipe.

According to the wastewater treatment system of the present invention, a first flow meter and a second flow meter may be installed in the transfer pipe and the bypass pipe, respectively, for measuring the flow rate of the water passing through the transfer pipe and the bypass pipe.

According to the wastewater treatment system of the present invention, the first and second flow rate control valves are in the form of electric valves, and the flow rate control means is provided with first and second flow rate control valves And a control unit for controlling the amount of opening of the valve.

According to the wastewater treatment system of the present invention, the controller can be configured to control the opening amounts of the first and second flow rate control valves in accordance with the set flow rate distribution.

According to the wastewater treatment system of the present invention, the number of reaction chambers constituting the bioreactor may be three to six.

According to the wastewater treatment system of the present invention, the screen group may include a first screen group and a second screen group which are sequentially installed, or may be formed as a single screen group.

According to the present invention having the above-described structure, it is possible to further reduce the amount of raw material to be supplied to the rotary microorganism contact apparatus when the load of the organic matter flowing into the biological reactor is reduced by providing a bypass piping and a flow rate control means. It is possible to flexibly cope with the variation of the load, thereby optimizing the growth conditions of the microorganism mixed bacteria for the optimum removal efficiency of nutrients.

Also, according to the present invention, it is possible to bypass the raw water to the rotary microorganism contact device by bypassing the entire amount of the organic substance due to the reduction of the load of the organic matter introduced into the biological reaction tank. In this case, There is an advantage of saving energy for operation.

According to the present invention, the ratio of the bypass flow rate and the flow rate flowing into the rotary microorganism contact apparatus can be adjusted in the range of 0 to 100 percent, respectively, in accordance with the variation of the load of the organic matter flowing into the bioreactor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a wastewater treatment system using a microorganism mixed bacteria according to an embodiment of the present invention; FIG.
2 is a view showing an example of a flow rate control means and a flow meter of a rotary microorganism contact apparatus according to the present invention.
3 is a view showing another example of a flow meter and a flow rate control means of a rotary microorganism contact apparatus according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a wastewater treatment system using microorganism mixed bacteria related to the present invention will be described in detail with reference to the drawings.

1 is a configuration diagram of a wastewater treatment system using a microorganism mixed bacteria according to an embodiment of the present invention.

Referring to FIG. 1, the wastewater treatment system using the microorganism mixed bacteria according to the present embodiment includes a wastewater treatment unit, a first metering tank 9, a rotating microorganism contacting apparatus 11, a second metering tank 13, (14), and the like.

The wastewater pre-treatment unit is for pretreatment of contaminants and suspended substances contained in the wastewater, and may include a first screen tank 2 provided with a first screen, a second screen tank 3 provided with a second screen, and the like. The raw water is introduced into the first screen tank 2 through the inflow pipe 1 and the relatively large suspended substances contained in the raw water are removed through the first screen provided in the first screen tank 2. In addition to the configuration in which the two screen shafts are sequentially installed as described above, the screen shafts can be configured to have only one screen shafting.

After the second screen tank 3, a flow rate adjusting tank 6 for adjusting the flow rate of the wastewater can be installed. An air supply pipe is provided in the flow rate control tank 6 to prevent the deposition of suspended substances and prevent the decay of raw water. The raw water that has passed through the flow rate adjusting tank 6 is sent to the first metering tank 9 through the transfer pipe 7.

The first metering tank 9 provides a space for administering the microbial activator to the raw water introduced from the flow rate regulating tank 6 and provides a space for introducing the return water and the transporting sludge described below.

The rotary microorganism contactor 11 is connected to the first weighing tank 9 through a transfer pipe 10 and functions as a habitat suitable for cultivating mixed microbes to purify wastewater from the first weighing tank 9 . The rotary microorganism contactor 11 has a structure in which a rotatable microorganism contactor 11b is rotatably driven in the microorganism contact tank 11a.

The rotatable microorganism contactor 11b is formed in a reticular form and attached with a microfilm film (Biofilm). The rotatable microorganism contactor 11b is made of a polyvinylidene chloride (polyvinylidene chloride) -based adhesive so that a rigid synthetic fiber material, such as polyvinylidene chloride, can bend properly and is irregularly reticular Spraying method, and adhered to each other at the intersections of the fibers in accordance with the adhesion and coagulation of the adhesive. The rotatable microorganism contactor 11b has a high porosity so that the wastewater and air can easily enter and exit the network when rotating so that the growth of the microorganism-mixed microorganisms can be enhanced and a good treatment effect can be obtained.

The rotatable microorganism contactor 11b is supplied with the wastewater and air for the fiber structure in an appropriate state to each other as a part of the rotatable microorganism contactor 11b is immersed in the wastewater and partially exposed to the atmosphere and rotated at a proper speed.

The microbial film removing air supply pipe 11c may be installed in the microbial contact tank 11a under the microbial contact tank 11a. If the amount of microorganism mixed bacteria is increased on the network-type rotary contact body 11b, the microbial film of the microorganism mixed bacteria may become insufficient in oxygen transfer and become anaerobic. The microbial film removing air supply pipe 11c blows air into the microbial contact tank 11a to remove the microbial film adhered unnecessarily unnecessarily, thereby enhancing the treatment efficiency.

The microbial film desorbing air supply pipe 11c may be divided into one to five depending on the number of the microbial contact bodies.

In addition, there is a fear that a floating material is deposited on the bottom of the microorganism contact tank 11a and anaerobicization occurs, thereby adversely affecting the treatment efficiency. A separate deposit auxiliary air supply pipe 11d may be additionally provided at the bottom of the microbial contact tank 11a to float the deposit on the bottom of the microbial contact tank.

When the rotatable microorganism contact body 11b made of synthetic fibers and made of synthetic fibers is partially immersed in the wastewater and rotated, the microorganism contact bacterium 11a, As the microorganism grows algebraically, the pollutants in the wastewater are consumed and metabolized vigorously.

The second metering tank 13 is connected to the rotating microorganism contact device 11 and provides a space for administering the microbial activator to the raw water introduced from the rotating microorganism contact device 11. [ Similarly to the first metering tank 9, the second metering tank 13 also provides a space through which the return water and the transporting sludge are introduced.

The bioreactor 14 has a plurality of reaction chambers for reacting the treated water supplied from the second metering tank 13 to remove untreated organic matter and nutrients. The number of reaction chambers constituting the bioreactor 14 may be three to six. In this embodiment, three reaction chambers 14a, 14b and 14c are provided. An air supply pipe for supplying air is provided in the inside of the biological reaction tank 14. In this embodiment, an air supply pipe is provided only in the second reaction chamber 14b and the third reaction chamber 14c.

The bioreactor 14 removes the first treated organic matter and nutrients as a metabolite by injecting air so that a mixed microbial bacteria comes into contact with the wastewater in a fluidized phase and maintains a certain amount of DO, and mixes Liquor Suspended Solids (MLSS) .

A circulation pump 15 and a circulation pipe 16 are provided at the outlet of the biological reaction tank 14 and a part of the treated water discharged from the third reaction chamber 14c of the biological reaction tank 14 is supplied to the circulation pump 15 To the first and second weighing vessels 9, Thus, the concentrations of the microbial bacteria in the microbial contact tank 11a and the bioreactor 14 can be maintained at optimum levels.

The treated water from the bioreactor 14 is transferred to the settling tank 18 by the transfer pipe 17 to perform solid-liquid separation, and the supernatant is introduced into the discharge tank 24 and discharged.

In the settling tank 18, a conveying sludge pump 19 and a conveying sludge pipe 20 for conveying the sludge to the first and second weighing vessels 9 and 13 are connected to maintain a high concentration of the microorganism mixed bacteria.

The surplus sludge remaining after returning the sludge from the sedimentation tank 18 is collected in the sludge concentration tank 23 through the surplus sludge pipe 22 by the surplus sludge pump 21 and sent to the dehydration treatment facility Is discarded.

According to the present invention, the bypass pipe (8) is branched to the transfer pipe (7) connecting the flow rate control tank (6) and the first metering tank (9). The bypass piping 8 functions to bypass the raw water that has passed through the flow rate control tank 6 to the second metering tank 13 or the bioreactor 14. In this embodiment, the bypass pipe 8 bypasses the raw water that has passed through the flow rate control tank 6 to the second metering tank 13, but it is also possible to bypass the bioreactor 14 I will do it.

On the other hand, unlike the present embodiment, the bypass pipe 8 may be branched at the transfer pipe 5 connecting between the second screen tank 3 and the flow rate adjusting tank 6. In this case, 3) to the second metering tank (13) or the bioreactor (14).

The wastewater treatment system of the present invention has flow rate control means for controlling the amount of raw water input into the rotary microorganism contactor 11 and the amount of bypass through the bypass line 8, which will be described in detail below. It is possible to control the amount of raw water to be supplied to the rotary microorganism contact device 11 according to the wastewater treatment load through the flow rate control means.

2 is a view showing an example of a flow rate control means and a flow meter of the rotary microorganism contact apparatus according to the present invention.

2 shows a first flow rate control valve 7a provided on the transfer pipe 7 connecting the flow rate control tank 6 and the first metering tank 9 as the flow rate control means and a second flow rate control valve 7b provided on the bypass pipe 8 And the second flow control valve 8a is used. The first flow rate control valve 7a and the second flow rate control valve 8a can be configured to open or close the opening of the transfer pipe 7 and the bypass pipe 8 respectively and to adjust the opening amount thereof. In this case, the adjustment range of the opening amount can be set to 0% to 100%, respectively.

The entire amount of the raw water from the flow rate adjusting tank 6 is bypassed to the second measuring tank 13 or the entire amount is supplied to the rotary microorganism contactor or the desired ratio (0% to 100%: 100% to 0 %), And so on.

A first flow meter 7b and a second flow meter 8b for measuring the raw water flow rates of the transfer pipe 7 and the bypass pipe 8 can be respectively installed in the transfer pipe 7 and the bypass pipe 8 . The operator operates the desired flow rate by adjusting the amount of opening of the first flow rate control valve 7a and the second flow rate control valve 8a based on the measurement results of the first flow meter 7b and the second flow meter 8b .

3 is a view showing another example of a flow meter and a flow rate control means of the rotary microorganism contact apparatus according to the present invention.

According to the flow rate control means of the present embodiment, the controller 25 can be additionally provided in the foregoing embodiment.

In this embodiment, the first flow rate control valve 7a and the second flow rate control valve valve 8a are in the form of electric valves capable of adjusting the opening amount by an electric signal, and the controller 25 controls the first and second flow rate control valves 7a, And controls the opening amounts of the first and second flow rate control valves 7a and 8a based on the measurement results of the first and second flow rate control valves 7b and 8b.

When the operator sets the flow rate distribution ratio (the ratio between the input contact flow rate and the bypass flow rate) in advance, the control unit 25 controls the opening and closing of the first and second flow rate control valves 7a and 8a And can be configured to control the metering.

For example, when the predetermined flow rate distribution ratio is 40:60, the controller 25 determines that the ratio of the contact charge flow rate to the bypass flow rate is 40 (= 40:60) based on the measurement flow rate received from the first and second flow meters 7b and 8b : 60, the amount of opening of the first and second flow control valves 7a and 8a is adjusted. This has the advantage that the set distribution ratio is automatically adjusted without operator monitoring and valve manipulation.

In the wastewater treatment system described above, Bacillus species among the microorganism mixed bacteria can be ignited according to the composition of the active agent and the operation method.

The wastewater treatment system using the microorganism mixed bacteria as described above is not limited to the configuration and method of the embodiments described above, but all or a part of the embodiments may be selectively combined .

1: inlet pipe 4: raw water transfer pump
2: first screen group 6: flow rate adjusting tank
3: Second screen set 9: First weighing set
5, 7, 10, 12, 17: Feed pipe 11: Rotary microorganism contact device
11a: Microorganism contact tank 11b: Rotary microorganism contact body
11c: Microorganism film desorption air supply pipe
11d: Deposition float air supply pipe
13: Second metering tank 14: Bioreactor
14a, 14b, 14c: first to third reaction chambers 15: circulation pump
16: circulation pipe 23: sludge thickener tank
18: settling tank 24: discharge tank
19: Return sludge pump 20: Return sludge pipe
21: excess sludge pump 22: excess sludge pipe
8: Bypass piping 7a: First flow control valve
8a: second flow control valve 7b: first flow meter
8b: second flow meter 25:

Claims (8)

A screen tank for pretreatment of impurities and suspended matters contained in the wastewater;
A flow regulating tank for regulating the flow rate of the wastewater passing through the screen tank;
A first metering tank for mixing the transporting sludge with the microbial activator to the raw water introduced from the flow rate adjusting tank;
A rotating microorganism contact device in which a plurality of reticulated microorganism contact bodies with a microbial film attached are provided in a microbial contact tank;
A second metering tank connected to the rotating microorganism contacting device, for mixing the microbial activator and the transporting sludge in the raw water introduced from the rotating microorganism contacting device;
A bioreactor having a plurality of reaction chambers for reacting the treated water supplied from the second metering tank to remove untreated organic matter and nutrients;
Wherein the flow control valve is branched from a transfer pipe for connecting the flow rate adjusting tank and the first metering tank or a transfer pipe for connecting the screen tank and the flow rate adjusting tank and the raw water passing through the flow rate adjusting tank or the raw water passing through the screen tank, Bypass piping bypassing the bioreactor; And
And a flow regulating means for regulating an amount of raw water input to the rotary microorganism contactor and an amount of bypass through the bypass pipe. The method according to claim 1,
Wherein the microorganism-mixed microorganism includes Bacillus subtilis. The flow control device according to claim 1 or 2,
And a first flow control valve and a second flow control valve installed in the transfer pipe and the bypass pipe, respectively. The method of claim 3,
Wherein the transfer pipe and the bypass pipe are respectively provided with a first flow meter and a second flow meter for measuring a flow rate passing through the transfer pipe and the bypass pipe. 5. The method of claim 4,
Wherein the first and second flow control valves have the form of a motorized valve,
Further comprising a controller for controlling opening amounts of the first and second flow rate control valves based on the measurement results of the first and second flow meters. 6. The method of claim 5,
Wherein the controller is configured to control the amount of opening of the first and second flow rate control valves according to the set flow rate ratio. The method according to claim 1,
Wherein the number of the reaction chambers constituting the bioreactor is three to six. The method according to claim 1,
Wherein the screen tray includes a first screen tray and a second screen tray that are sequentially installed.

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