KR20100088283A - High effective treatment apparatus and method of sewage and wastewater using membrane - Google Patents

Abstract

PURPOSE: An apparatus and a method for effectively processing polluted water using a separating membrane are provided to analyze and diagnose operating states and display the result of the analysis and the diagnosis at a remote place. CONSTITUTION: A first anoxic chamber(12) denitrifies nitrate nitrogen in polluted water. An aeration chamber(13) oxidizes and nitrifies organic matters in the denitrified polluted water. A second anoxic chamber(14) additionally denitrifies the nitrate nitrogen in the polluted water. A membrane separating aeration chamber(15) additionally oxidizes and nitrifies remained organic matters in the polluted water. A membrane module(10) separates processed water and sludge using separating membrane.

Description

High Effective Treatment Apparatus and Method of Sewage and Wastewater Using Membrane

The present invention relates to an advanced wastewater treatment apparatus and treatment method using a separation membrane, and more specifically, by repeatedly purifying nitrogen, phosphorus and organic matter in wastewater through a first anoxic tank, an aerobic tank, a second anoxic tank, and a membrane separation tank. The present invention relates to an advanced wastewater treatment system and treatment method using a separation membrane to increase the purification efficiency.

Water is an essential substance that maintains the life of all living things on the earth, and it descends to the surface of the earth through snow or rain through the water cycle. In Korea, rainfall is concentrated according to regions or seasons and is considered a finite resource.

The dirty water used and thrown away by humans was cleaned and cleaned up by the self-cleaning action, which is the principle of nature, and returned to the natural world to maintain the ecosystem.However, after the industrial revolution, water pollution became severe due to urbanization and industrial development due to population concentration. As a result, there is an increasing need for active development of measures to recycle wastewater economically.

An important point in recycling waste water is to treat nitrogen, phosphorus, organic matter, etc., turbidity, pH, and the like in the waste water to be recycled to the required level, and to remove pathogenic microorganisms to ensure environmental engineering stability.

Nitrogen or phosphorous from agricultural fertilizers, manure or livestock manure, or synthetic detergents can enter the water system, causing eutrophication, coastal red tide, fish toxins in ammonia, and dissolved oxygen deficiency in water. Increasing chlorine demand and causing health, such as cyanosis, when nitrate nitrogen is present in drinking water at high concentrations.

In addition, algae overgrowth due to inflow of nitrogen, phosphorus, etc. may cause unpleasantness in taste and smell of tap water, causing blockage of sand filter paper, which is a water purification process, and toxic substances in case of overgrowing cyanobacteria. It can create and impair human health.

As such, the inflow of nitrogen and phosphorus into the water system causes problems such as economic loss caused by the increase of the purified water cost, difficulty in securing safe and clean water resources for public health, and thus, blocking the inflow of nutrients into the water system is required. As the most fundamental solution, the treatment of nitrogen and phosphorus as well as the removal of organic matter from wastewater and livestock wastewater is emphasized more.

For the treatment of nitrogen and phosphorus, a membrane bioreactor (MBR) has been developed that combines advanced processing and biological treatment for the treatment of pathogenic microorganisms and suspended solids.

A conventional membrane bioreactor is composed of an oxygen-free tank, an aeration tank and a membrane module installed in the aeration tank. Inside the oxygen-free tank is provided with a high concentration of sludge layer to perform the denitrification treatment of the incoming waste water and to remove organic matter. In addition, the wastewater introduced from the anaerobic tank is removed phosphorus by the microorganisms in the aeration tank, the organic matter is removed by the membrane module installed in the aeration tank.

The conventional membrane bioreactor is composed of an anoxic tank for denitrifying nitrate nitrogen using organic materials and an aerobic tank for converting ammonia nitrogen to nitrate nitrogen, and the treated water from which the organic material is removed through the membrane module in the aerobic tank is The water transported to the storage tank and mixed with sludge from the aeration tank is returned to the anoxic tank.

In order to remove nitrogen biologically, in most processes, the reaction tank is disposed in the order of anoxic tank and aerobic tank, and the nitrate nitrogen generated in the aerobic tank is transferred to the anoxic tank by using an internal transfer pump and piping. Since the amount of organic matter in the waste water is limited, it is generally returned to the inside for further denitrification only within 3 to 4 times the flow rate and the rest is discharged to the treated water.

Since the nitrogen removal rate is greatly influenced by the water temperature of the reactor, the concentration of microorganisms, the characteristics of the influent, the time, the season, etc., it is very difficult to control the nitrogen concentration of the treated water below the regulated level, and therefore, if the temperature exceeds the limit, the anaerobic tank is primarily used. An additional external carbon source is added to the reactor to improve the denitrification rate and to control nitrogen in the aerobic tank to remove nitrogen on a limited basis.

However, since the nitrate nitrogen, which is internally returned from the aerobic tank and flows out to the treated water, is essentially limited in nitrogen removal. Therefore, if C / N of influent water is very low, or if stable treatment is required during the year-round or less than 5mg / L of nitrogen and less than 0.5mg / L of phosphorus, the existing nitrogen and phosphorus removal process is difficult to process and additional process is required. There is a problem of additional installation and operating costs.

The present invention has been made to solve the above-mentioned conventional problems, it is possible to analyze and diagnose the operating status of each of the components of the advanced processing apparatus at a remote location and display the results, even if the C / N ratio is low It is an object of the present invention to provide an advanced wastewater treatment apparatus and treatment method using a separation membrane capable of treating nitrogen to target water quality and obtaining high efficiency of removing nitrogen, phosphorus and organics without installing additional facilities.

The present invention for achieving the above object, the first anoxic tank for denitrifying the nitrate nitrogen in the waste water; An aerobic tank for oxidizing and nitrifying organic matter in wastewater treated in the first anoxic tank; A second anoxic tank for further denitrifying the nitrate nitrogen in the wastewater treated in the aerobic tank; A membrane separation tank for further oxidizing and nitrifying residual organic matter of the wastewater treated in the second anoxic tank; A membrane module installed in the membrane separation tank to separate treated water and sludge using a separation membrane; A first conveying line for conveying activated sludge in the aerobic tank to the first anoxic tank; And an operation management unit for analyzing and diagnosing operation states of the respective components and displaying the results.

The present invention provides a sludge denitrification tank connected to an upstream of the first anoxic tank to remove nitrate nitrogen and residual dissolved oxygen in the waste water, and the membrane separation tank and the sludge denitrification tank to connect the activated sludge in the membrane separation tank. And a second conveying line for conveying to the sludge denitrification tank.

The operation management unit of the present invention analyzes and diagnoses the operation state of each of the above components based on real-time measuring instrument measurement data and laboratory analysis data using a fuzzy or artificial neural network (ANN).

The membrane module of the present invention includes a mounting device for mounting the filtration membrane module to the frame structure, wherein the mounting device is a horizontal rod disposed in parallel with the direction in which the filtration membrane module is inserted into the frame structure and the frame structure side along the horizontal rod Consists of a movable portion, to form a concave-convex inside the frame structure to prevent the fall of the filter membrane module due to long-term use.

The present invention provides a method for treating wastewater using a separator using an advanced wastewater treatment apparatus using the separator described above, comprising: denitrifying the nitrate nitrogen in the wastewater in the first anoxic tank; Oxidizing and nitrifying the organic material in the waste water in the aerobic tank; Further denitrifying the nitrate nitrogen in the waste water in the second anaerobic bath; Further oxidizing and nitrifying residual organic matter in the membrane separation tank; And separating the treated water and the sludge by the membrane of the membrane module in the membrane separation tank, wherein the activated sludge in the tank is returned to the first anoxic tank via the first conveying line.

As described above, the present invention can analyze and diagnose the operation state of each of the components of the altitude processing apparatus at a remote location by the operation management unit and display the result.

In addition, by repeatedly treating the nitrogen in the influent through the first and the second conveying line, even if the C / N ratio in the influent is low, there is an advantage that can control the nitrogen of the treated water to 5mg / L or less.

In addition, since the configuration of the device does not require a separate sedimentation basin or a subsequent filtration device, it is possible to reduce the size of the wastewater treatment device, thereby minimizing the use site for installing the device.

In addition, the operation management unit of the present invention by analyzing and diagnosing the operating state of each of the above configuration based on real-time measuring instrument measurement data and laboratory analysis data using the Fuzzy or Artificial Neural Network (ANN), There is an advantage that can operate the processing device efficiently and stably.

In addition, the membrane module of the present invention has the advantage of preventing the dropping of the filtration membrane module due to long-term use by forming irregularities in the frame structure.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram showing an advanced wastewater treatment system using a separator according to an embodiment of the present invention, Figure 2 shows an operating state of the operation management unit of the wastewater advanced treatment apparatus using a separator according to an embodiment of the present invention. This is a working state diagram.

As shown in FIG. 1, the wastewater advanced treatment apparatus using the separation membrane of the present embodiment includes a first anoxic tank 12, an aerobic tank 13, a second anoxic tank 14, a membrane separation aeration tank 15, a membrane module 10, The first conveying line 6 and the operation management unit.

The first anoxic tank 12 denitrates the nitrate nitrogen in the wastewater flowing into the advanced treatment apparatus of this embodiment. The aerobic tank 13 is connected upstream of the first anoxic tank 12 to oxidize and nitrify the organic matter in the waste water.

The second anoxic tank 14 is connected upstream of the aerobic tank 13 to further denitrify the nitrate nitrogen. The membrane separation tank 15 is connected upstream of the second anoxic tank 14 to further oxidize and nitrify residual organic matter in the waste water, and to solid-liquid separate the treated water and the microorganism.

The membrane module 10 is installed in the membrane separation tank 15 to separate the treated water and the sludge using the membrane. The membrane module 10 includes a mounting apparatus for mounting the filtration membrane module to the frame structure.

The mounting apparatus includes a horizontal bar disposed in parallel with a direction in which the filtration membrane module is inserted into the frame structure, and a moving part movable along the horizontal bar toward the frame structure.

Unevenness is formed in the frame structure of the membrane module 10 to prevent the filtration membrane module from falling off due to prolonged use.

The first conveying line 6 is installed to communicate the first anaerobic tank 12 and the aerobic tank 13 to convey the activated sludge in the aerobic tank 13 to the first anoxic tank 12.

As shown in FIG. 2, the driving management unit may be installed at a short distance or a remote location to analyze and diagnose a driving state of each component of the altitude processing apparatus and display the result. In addition, the operation management unit is an intelligent operation management unit using a fuzzy or artificial neural network (ANN), and analyzes and diagnoses the operation state of each of the above components based on real-time measuring instrument measurement data and laboratory analysis data. .

As such, the operation management unit analyzes and diagnoses the process operation status based on real-time measuring instrument measurement data and laboratory analysis data, and displays the result in the form of a traffic light, thereby providing an effect that allows the driver to grasp the overall driving situation at a glance.

On the other hand, the advanced processing apparatus of the present embodiment, the sludge denitrification tank 11, the nitrate nitrogen is conveyed and denitrified by the membrane separation tank 15, the membrane separation tank 15 and the sludge denitrification tank 11 It may further include a second conveying line (7) connecting the.

In addition, a screen tank 2 having a screen 1 for filtering the contaminants contained in the waste water before the waste water flows into the first anoxic tank 12 may be further provided. In addition, the advanced processing apparatus of the present embodiment is an inlet pipe (3) to allow the wastewater that has passed through the screen tank (2) to the sludge denitrification tank (11) and the first anoxic tank (12), and sludge from the inlet pipe (3). The denitrification tank 11 and the first anoxic tank 12 may further include an inlet valve 4 for distributing and adjusting the influent.

Blower (9) is connected to the exhalation tank (13) and the membrane separation exhalation tank (15), the air dispersing device for supplying oxygen in the exhalation tank (13) and the membrane separation exhalation tank (15), respectively, sludge denitrification tank (11) ), The first anoxic tank 12 and the second anoxic tank 14 may be provided with an underwater stirrer 8 for preventing dead space from occurring on one side and depositing of sludge at the bottom.

Hereinafter, with reference to the accompanying drawings will be described in detail the wastewater advanced treatment method using the separator of the present embodiment.

3 is a flowchart showing a method for treating high wastewater using a separator according to an embodiment of the present invention.

As shown in Figure 3, the advanced wastewater treatment method using the separator of the present embodiment is a denitrification step (S10), oxidation and nitrification step (S20), further denitrification step (S30), further oxidation and nitrification step (S40), treated water And sludge separation step (S50), sludge conveying step (S60) and discharge step (S70).

First, the waste water is introduced into and passed through the screen tank 2 having the screen 1. The screen tank (2) is provided with a screen (1) for filtering contaminants, such as sand or gravel contained in the waste water, and serves to filter the contaminants of the waste water before entering the reactor. The spacing of the screen 1 is usually 1 to 2 mm, and the form or spacing of the screen 1 is not limited.

Waste water passing through the screen tank 2 is introduced into the sludge denitrification tank 11 and the first anoxic tank 12 through the inlet pipe (3). The inlet pipe 3 is configured to allow the wastewater that has passed through the screen tank 2 to be separated into the sludgetal nitrile 11 and the first anoxic tank 12, and each inflow pipe 3 is introduced into the wastewater. It may include a configuration in which the inlet valve 4 for adjusting the quantity of water is installed.

In the denitrification step (S10), the nitric acid nitrogen in the wastewater introduced into the first anoxic tank 12 is denitrified and flows out to the aerobic tank 13 installed downstream of the first anoxic tank 12.

In the oxidation and nitrification step (S20), the organic matter in the waste water introduced into the aerobic tank 13 is oxidized and nitrified, and flows out to the second anoxic tank 14 installed downstream of the aerobic tank 13.

The further denitrification step S30 further denitrates the nitrate nitrogen in the wastewater introduced into the second anoxic tank 14 to flow out to the membrane separation aeration tank 15 installed downstream of the second anoxic tank 14.

Further oxidation and nitrification step (S40) is to further oxidize and nitrify the residual organic matter of the waste water introduced into the membrane separation tank (15).

Treatment water and sludge separation step (S50) is to separate the treated water and sludge by the membrane of the membrane module 10 in the membrane separation tank 15.

In the sludge conveying step (S60), the activated sludge in the aeration tank 13 is conveyed to the first anoxic tank 12 via the first conveying line 6 to circulate the activated sludge.

Discharge step (S70) is to discharge the treated water separated by the membrane module to the outside.

As such, the wastewater passing through the first anaerobic tank 12 and the aerobic tank 13 is further passed through the second anoxic tank 14 and the membrane separation aeration tank 15 to continuously provide anaerobic and aerobic conditions to the microorganisms in the wastewater. Thus, nitrogen, phosphorus and organics in the waste water are repeatedly removed.

In addition, in the present embodiment, each of the reaction tanks, such as the first anoxic tank, the aerobic tank, the second anoxic tank, the membrane separation tank, etc. may be provided with a water level measuring sensor 16 for measuring the level of the reaction tank. The control unit for controlling the amount of waste water flowing into the reactor by controlling the inlet valve (4) installed on the inlet pipe (3) according to the water level value measured by the water level measurement sensor 16 and the predetermined water level value It may be provided.

When wastewater flows into the first anoxic tank 12 through the screen tank 2, the first anoxic tank 12 undergoes a denitrification process by decomposing nitrate nitrogen into nitrogen gas using a carbon source in the wastewater. Removal reaction takes place.

In addition, the process of denitrifying and removing the nitrate nitrogen internally conveyed from the aerobic tank 13 through the first conveying line 6 and the oxidation reaction of some organic substances also occur in the first anoxic tank 12. It is removed through the first anaerobic tank 12 and the aerobic tank 13.

At this time, it is preferable to provide an underwater stirrer 8 in the dead space formed in the first anoxic tank 12 and in the first anoxic tank 12 in order to prevent the lower deposition of the sludge.

In the aerobic tank 13, untreated water is introduced from the first anoxic tank 12, and in the aerobic tank 13, a reaction in which the organic matter in the inflowed untreated water is oxidized and a nitrification reaction in which ammonia nitrogen is changed to nitrate nitrogen occur simultaneously.

In addition, a phosphorus removal reaction occurs in the aerobic tank 13, and the phosphorus is biologically removed using microorganisms in the untreated water. If the phosphorus concentration in the untreated water does not reach the target concentration by the biological method alone, the aerobic tank 13 is removed. Target water quality can be achieved by direct injection of flocculants to remove phosphorus by chemical means.

In this case, the exhalation tank 13 is connected to the blower (9) is provided with an air dispersing device for supplying oxygen in the exhalation tank (13), the air bubbles generated by the air blower connected to the blower (9) is an exhalation tank (13) It supplies dissolved oxygen in) and promotes nitrification reaction.

The untreated water treated in the aerobic tank 13 flows into the second anoxic tank 14. In the second anoxic tank 14, since the nitrate nitrogen introduced from the aerobic tank 13 is removed using endogenous denitrification or an external carbon source, it is possible to control the nitrogen concentration of the treated water according to the input amount of the external carbon source.

In this case, as in the first anoxic tank 12, the second anoxic tank 14 is also provided with an underwater stirrer 8 to prevent the dead space from being formed and to be deposited under the sludge second anoxic tank 14. It is preferable.

In this way, by providing the second anoxic tank 14 connected to the aerobic tank 13, it is possible to further denitrate nitrate nitrogen not removed from the first anoxic tank 12, it is possible to remove nitrogen with high efficiency.

The untreated water denitrated in the second anoxic tank 14 is introduced into the membrane separation tank 15. In the membrane separation vessel 15, a membrane module 10 having a plurality of micromembrane is installed, and the inflow water passes from the lower part of the membrane module 10 to the upper part to filter particulate matter in the water by the micromembrane. And further organic removal reactions and nitrification and dephosphorization reactions take place.

An upper portion of the membrane module 10 is provided with an outlet pump 5 for moving the treated water passing through the membrane module 10 to the treated water tank through the outlet pipe. In this case, an air diffuser may be installed at the bottom of the membrane separation vessel 15 or at the bottom of the membrane module 10. The air diffuser is connected to the blower (9), and serves to promote the nitrification reaction by supplying dissolved oxygen by generating bubbles in the membrane separation tank (15).

In addition, the sludge is prevented from adhering to the membrane surface of the membrane module 10 while passing from the lower part of the membrane module 10 to the upper part. The blower 9 connected to the membrane separation tank 15 may be connected to the blower 9 connected to the exhalation tank 13 in the same line or in a plurality of lines.

The sludge denitrification tank 11 maximizes the use of the carbon source in the influent by denitrifying and removing the nitrate nitrogen in the untreated water returned from the membrane separation tank 15 and removing residual dissolved oxygen in the water. In this way, it is possible to maximize the use of the carbon source, it is possible to control the nitrogen of the treated water to the target water quality regardless of the C / N ratio of the influent.

In addition, partial release of phosphorus occurs in the sludge denitrification tank 11, and as in the first anoxic tank 12 and the second anoxic tank 14, it is preferable that an underwater stirrer 8 is provided.

In addition, the membrane separation tank 15 and the sludge denitrification tank 11 are continuously arranged so that the activated sludge floating on the water surface of the membrane separation tank 15 without the second conveying line 7 is introduced into the sludge denitrification tank 11. It is also possible to make it return.

As for the mechanism of nitrogen and phosphorus removal in water, nitrogen exists in water in the form of proteins, amino acids, organic nitrogen such as urea, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen.

Organic nitrogen contaminated in water is decomposed into ammonia nitrogen by the action of microorganisms and then oxidized to nitrate nitrogen through nitrite nitrogen.Inorganic microorganisms living in water are inorganic such as ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. Nitrogen is used as a nutrient to multiply.

The aerobic tank 13 and the membrane separation aerobic tank 15 of this embodiment are reaction tanks that provide an aerobic environment, and decompose ammonia nitrogen into nitrate nitrogen. The first anoxic tank 12, the second anoxic tank 14, and the sludge denitrification tank 11 of the present embodiment serve to provide an anaerobic environment, and serve to remove nitrogen by denitrifying nitrate nitrogen.

In water, phosphorus is present in the form of organic phosphorus such as protein, ATP, phosphorous phosphate and polyphosphorus phosphate. Such phosphorus is converted to phosphate in water and used by algae. If the amount is too large, the COD increases due to the overgrowth of algae, causing water pollution.

In this embodiment, the phosphorus is partially removed from the anaerobic environment of the first anoxic tank 12, the second anoxic tank 14, and the sludge denitrification tank 11 and the membrane separation aeration tank 15. Most phosphorus is removed by chemical means.

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

1 is a block diagram showing a high wastewater treatment apparatus using a separator according to an embodiment of the present invention.

2 is an operating state diagram showing an operating state of the operation management unit of the wastewater advanced treatment apparatus using a separator according to an embodiment of the present invention.

Figure 3 is a flow chart showing a high wastewater treatment method using a separator according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: screen 2: screen

3: inlet pipe 4: inlet valve

5: outflow pump 6: first conveying line

7: second return line 8: underwater stirrer

9: blower 10: membrane module

11: sludge denitrification tank 12: first anoxic tank

13: Expiry 14: Second Anoxic

15: membrane separation tank 16: level measurement sensor

17: sludge drawing pump 18: external carbon source injection device

Claims (5)

A first anoxic tank for denitrifying the nitrate nitrogen in the waste water; An aerobic tank for oxidizing and nitrifying organic matter in wastewater treated in the first anoxic tank; A second anoxic tank for further denitrifying the nitrate nitrogen in the wastewater treated in the aerobic tank; A membrane separation tank for further oxidizing and nitrifying residual organic matter of the wastewater treated in the second anoxic tank; A membrane module installed in the membrane separation tank to separate treated water and sludge using a separation membrane; A first conveying line for conveying activated sludge in the aerobic tank to the first anoxic tank; And And an operation management unit for analyzing and diagnosing operation states of the components and displaying the results. The method of claim 1, A sludge denitrification tank connected upstream of the first anoxic tank to remove nitrate nitrogen and residual dissolved oxygen in the waste water; And a second conveying line connecting the membrane separation tank and the sludge denitrification tank to return the activated sludge in the membrane separation tank to the sludge denitrification tank. The method of claim 1, The operation management unit uses a fuzzy or artificial neural network (ANN) to analyze and diagnose operating conditions of the respective components based on real-time measuring instrument measurement data and laboratory analysis data. Wastewater advanced treatment device using. The method of claim 1, The membrane module includes a mounting device for mounting the filtration membrane module to the frame structure, wherein the mounting device may move toward the frame structure along the horizontal rod and the horizontal rod disposed parallel to the direction in which the filtration membrane module is inserted into the frame structure. Consists of moving parts, By forming irregularities in the frame structure to prevent the falling off of the filtration membrane module according to long-term use, advanced wastewater treatment apparatus using a separation membrane. A wastewater advanced treatment method using a separation membrane using a wastewater advanced treatment apparatus using the separation membrane according to any one of claims 1 to 4, Denitrifying the nitrate nitrogen in the waste water in the first anaerobic bath; Oxidizing and nitrifying the organic material in the waste water in the aerobic tank; Further denitrifying the nitrate nitrogen in the waste water in the second anaerobic bath; Further oxidizing and nitrifying residual organic matter in the membrane separation tank; And And separating the treated water and sludge by the membrane of the membrane module installed in the membrane separation tank. Activated sludge in the aerobic tank is returned to the first anaerobic tank via the first conveying line, characterized in that the wastewater advanced treatment method using a separation membrane.

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