KR101054613B1 - Apparatus for waste water single reactor composed of biological and membrane process - Google Patents

Abstract

PURPOSE: An apparatus for generating recycled water based on sewage and wastewater is provided to process plenty of wastewater using simple facilities equipped in a single reacting bath. CONSTITUTION: A biological processing bath(20) extends the residence time of microorganism. A filtering bath(30) filters inorganic materials which are non-processed in the biological processing bath using a microfiltration(MF) membrane and an ultrafiltration(UF) membrane(31). An air supplying pipe aerates air to grow microorganism. A reversible washing unit(33) detaches the microorganism from the surface of the MF membrane and the UF membrane. An advanced processing part(40) advancingly processes target water using a reverse osmosis membrane.

Description

Wastewater Recycling Water Production System Using Single Reactor Combining Biotreatment Process and Membrane Separation Process {APPARATUS FOR WASTE WATER SINGLE REACTOR COMPOSED OF BIOLOGICAL AND MEMBRANE PROCESS}

The present invention relates to an apparatus and method for treating sewage water using a single reaction tank in which a biological treatment process and a membrane separation process are combined. More particularly, the present invention provides a filtration and advanced treatment unit for filtering water discharged after the wastewater treatment process (hereinafter, referred to as effluent). It relates to a device and a method that can be recycled using.

Methods for recycling effluent discharged from general sewage, sewage and wastewater treatment facilities are classified into ozone treatment method, membrane separation method, activated carbon treatment method and advanced oxidation method.

The ozone oxidation method is a method of dissolving ozone in wastewater to decompose molecular organic compounds contained in wastewater. It is effective in removing THM (trihalomethane) precursors, color or odorous substances, and ozone has excellent sterilization effect. It kills all bacteria of water and does not produce chlorine-based organic compounds such as THM that can be generated during chlorine sterilization. However, ozone generators are expensive and decomposition of organic compounds by ozone is selective.

Membrane separation method is a method of removing contaminants by filtration using semi-permeable polymer membrane. It was developed around RO (reverse osmosis filtration) for desalination of industrial water.In developed countries, wastewater treatment standards and water treatment standards are gradually strengthening. Applicability of MF, UF, RO, NF, etc. to the water treatment process is being developed as a method for making it suitable for the process. However, in Korea, membrane method is used for domestic water purifier combining MF, UF, RO and activated carbon as water treatment technology, and it is not practical to use due to expensive facility investment cost for mass treatment of waste water and purified water. .

In addition, the filtered sludge is not only high organic matter content, but also because the ocean dumping is prohibited, there is a need for reprocessing such as organic matter treatment and volume reduction in the sludge.

Activated carbon treatment is a porous activated carbon that removes and adsorbs trace amounts of adsorbable organic compounds in raw water. Because it contains a lot of capacity, the capacity of the treatment facility is large, and the activated carbon exchange cycle is short, so it is rarely used for wastewater treatment.

Advanced treatment uses ozone, hydrogen peroxide, ultraviolet rays, iron salts, and titanium dioxide alone to produce highly oxidizing OH radicals, or to remove excess OH radicals in ozone / high pH and ozone. / Ozone / Hydrogen Peroxide, Ozone / UV, Hydrogen Peroxide / UV are produced by the combined method to completely decompose molecular organic compounds in waste water into carbon dioxide and water.

However, the single treatment method is difficult to produce a sufficient amount of OH radicals to decompose the molecular organic compounds contained in the wastewater, or it can react with a large number of organic compounds to reduce the treatment efficiency. In order to inject excessive chemicals, high initial investment and operation and management costs are required. In addition, the combined treatment method has better treatment efficiency in a small treatment facility than a single treatment method, but when a large capacity is processed, only a part of the combined treatment method has been put to practical use due to an increase in initial investment cost, high maintenance cost, and problems of treatment efficiency.

Looking at the technique for the reprocessing of the concentrated water using the membrane separation method described above can be registered Utility Model Publication No. 20-265754, the document is supplied directly connected to the water supplied through the pre-filter of the reverse osmosis water purifier And when the water is purified through the membrane, the drain pipe to discharge the concentrated water that can not pass through the membrane; A concentrated water reservoir configured to store concentrated water discharged from the drain pipe, the concentrated water being composed of a manhole, an overflow valve, a water supply, a shutoff valve, and a drain valve; It is composed of supply pipes installed in each layer and each compartment to recycle and use the concentrated water supplied from the water supply valve of the concentrated water reservoir as living water so that the concentrated water discharged without passing through the membrane can be collected and recycled into the domestic water. In addition, there is an effect that can extend the life of the membrane by recycling the concentrated water can be used as domestic water without re-filtering.

However, the document is not a system for effectively treating and recycling sewage water, but rather a device for filtering waste water by rearranging a general facility such as a storage tank, a valve, and a drain properly. Therefore, the degree of filtration is insignificant and there is a limit to use it for direct living water or industrial water. Accordingly, the present inventors have conducted studies to solve the wastewater more effectively, and have completed the present invention by applying a single reactor and ozone oxidation method.

Utility Model Registration 20-265754, Published Patent Publication 10-2010-113312

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Therefore, the present invention has been made in order to solve the problems of the conventional apparatus for use as advanced wastewater treatment and recycled water, it is possible to treat a large amount of wastewater, it is suitable for use in direct domestic or industrial water In order to provide an effective level of purification and wastewater treatment, the initial investment and maintenance costs are low.

In order to achieve the above object, the present inventors have developed a system for treating sewage water using a single reactor and an ozone treatment unit and a method for recycling concentrated water using the same.

The present invention to solve the above problems
In the wastewater recycling water production apparatus for effectively recycling the wastewater introduced through the screen tank (10),
The wastewater recycling water production apparatus includes a single reactor; It is composed of an advanced processing unit 40,
The single reactor
A biological treatment tank 20 in which microorganisms are operated in an endogenous stage after exponential growth by prolonging the retention time of the microorganisms in order to decompose and remove the organic material and nitrogen of the introduced wastewater using microorganisms;
It consists of a filtration tank 30 for filtering the inorganic material not removed from the biological treatment tank through the MF or UF membrane,
The filtration tank has a precipitation function capable of maintaining a large amount of microorganism concentration by solid-liquid separation through the MF or UF membrane 31; A filtration function for filtering the colloidal substance; It performs a disinfection function to remove pathogenic microorganisms by 0.45㎛ pore,
An air supply pipe 32 and a backwashing device 33 are attached to a lower portion of the filtration tank so that oxygen is aerated through the air supply pipe 32 to promote the growth of microorganisms, and when the microorganisms are excessive, the backwashing device (33) is used to desorb microorganisms attached to the surface of the MF or UF membrane 31,

The advanced treatment unit 40 is a high-treatment process using the RO membrane 41 to filter the treated water filtered in a single reactor to provide a wastewater recycled water production apparatus characterized in that it is operated as a means for solving the problem. do.
In addition, the present invention to solve the above problems more effectively

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The advanced processing unit provides a wastewater recycled water production apparatus, characterized in that the advanced treatment by injecting ozone into the concentrated water filtered using RO membrane at 50 ~ 150ppm 30 minutes ~ 90 minutes,
Finally, in the present invention
Introducing the wastewater having passed through the screen tank (10) into the biological treatment tank (20) of a single reaction tank consisting of the biological treatment tank (20) and the filtration tank (30);
Decomposing and removing the organic materials contained in the wastewater introduced into the biological treatment tank 20 by using microorganisms present in the endogenous stage;
Filtering the inorganic material and the colloidal material by transferring the wastewater from which the organic material is removed to the filtration tank 30 to which the MF or UF membrane 31 is attached;
Transporting the sewage water from which the inorganic material and the colloidal material are filtered in the filtration tank 30 to the advanced processing unit 40 to which the RO membrane 41 is attached to generate RO concentrated water;

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Injecting the concentrated water produced in the advanced processing unit 40 using ozone generator 60 for 30 minutes to 90 minutes in an ozone 50 ~ 150ppm; advanced processing; recycling the sewage water, characterized in that consisting of To provide a means for solving the problem.

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The wastewater recycled water production apparatus of the present invention can treat large volumes of wastewater only with a simple facility consisting of biotreatment, filtration and disinfection in a single reactor in a single process, and a level of purification suitable for use in direct living water or industrial water. It has the advantage of low initial investment and maintenance costs.

1 is a view showing a conventional wastewater treatment state.
2 is a view showing the configuration of the present invention.
3 is a view showing a process of treating wastewater through the configuration of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings and embodiments. The terms and examples described below are only illustrated to clearly describe the present invention, and it is obvious that the scope of the present invention should not be construed as being limited thereto.

1 is a view showing a conventional wastewater treatment state. As shown, after transporting the sewage water to the raw water tank and storing it, the anti-scaling agent is added to prevent scale and then transferred to the R / O separation device. Then, to control the pH of the sewage water, an alkaline agent is added and ozone is generated to remove harmful substances. Finally, concentrated water containing harmful substances not removed is configured to be removed through activated carbon tower and ion exchange resin tower.

Conventional methods are not effective in removing organic substances, especially organic slurries, which are included in sewage water treatment, so it is cumbersome to use an activated carbon tower or an ion exchange resin tower.

2 is a view showing the configuration of the present invention. As shown the present invention comprises a single reactor; It is composed of advanced processing unit.

Single reaction tank of the present invention and the biological treatment tank; It consists of a filtration tank, the biological treatment function, microorganism maintenance function (sedimentation function), filtration function, disinfection function is made in the single reaction tank.

The biological treatment tank is responsible for minimizing the organic material, nitrogen, sludge content of the introduced wastewater. For this purpose, the biological treatment tank of the present invention maintains the microbial concentration from 1,000 mg / L to 10,000 mg / L, preferably from 4,000 mg / L to 7,000 mg / L, more preferably from 5,500 to 6,500 mg / L. Maintaining the microorganism at the above concentration can maintain the growth state of the microorganism from the exponential growth stage to the endogenous growth stage, thereby minimizing the amount of excess sludge generated while removing the influent sewage organic matter and nutrients.

The microorganism used in the biological treatment tank uses the same as the microorganism used in the general sewage treatment plant. Specifically, Thiobacillus denitrificans, Thiomicrospira denitrificans, Thiobacillus versutus, Thiobacillus thiasis, Thiospara pantotropha, Parasphaera pantotroph Caucasus denitrificans and the like may be used, but are not necessarily limited thereto.

The filtration tank is a microorganism maintenance function (precipitation function) that can maintain a large amount of microbial concentration; A filtration function for filtering the colloidal substance; Disinfection function to remove pathogenic microorganisms by 0.45㎛ pore.

An air supply device is attached to the lower part of the filtration tank, and a glass fiber filter having a pore size of 0.45 μm is formed therein. By supplying oxygen to the microorganism through the air supply device performs a function (precipitation function) to maintain the microorganisms necessary for biological treatment. When a certain time elapses when filtering out the solid components of waste water, the membrane is fouled by suspended substances including microorganisms. The membrane surface is continuously washed by supplying oxygen through an air supply pipe attached to the lower part of the filtration tank. You can do it. As a result, the microorganisms in the biological treatment tank can be maintained at a constant concentration.

A glass fiber filter having a pore size of 0.45 μm is formed inside the filtration tank. Therefore, the total amount of microorganisms smaller than 0.45 μm remains in the reaction tank. Therefore, the microorganisms can be retained in the reaction tank without having a separate precipitation tank in the reaction tank.

The single reaction tank of the present invention has a feature of retaining a large amount of microorganisms while the biotreatment tank and the filtration tank are operated together, and the F / M (Foods / Microbes) ratio is lowered due to the large amount of microorganisms compared to the introduced organic material. .

In addition, the biotreatment tank is divided into anoxic conditions and aerobic conditions, so nitrogen removal is excellent due to the growth of nitrifying bacteria and denitrification bacteria, and some phosphorus-removing microorganisms (commonly known as Bio-P Bacteria; Azotobacter, etc.) inhabit to remove phosphorus (P). There are possible features.

The wastewater treated in the single reactor is sent to the advanced treatment unit. The advanced treatment unit is equipped with a reverse osmosis (RO) membrane, the wastewater introduced in a single reaction tank is filtered again through a reverse osmosis (RO) membrane to treat impurities not used as micronutrients and recycled water.

In addition, the advanced treatment unit is attached to the ozone supply device to reprocess the sewage (concentrated water) filtered through the reverse osmosis (RO) membrane more effectively. Specifically, 50 to 150 ppm of ozone is injected for 30 to 90 minutes. If necessary, it may be added in parallel with hydrogen peroxide.

3 is a view showing a process of producing wastewater as recycled water through the configuration of the present invention. As shown, the wastewater passed through the screen tank is introduced into the biological treatment process in a single reactor to decompose and remove organic and nutrient substances.

The wastewater passed through the biological treatment tank is introduced into a membrane separation process to filter inorganic materials, colloidal substances, E. coli, and the like through MF or UF membranes.

The wastewater, which has undergone the filtration step, is produced as recycled water by removing fine impurities and dissolved substances from the advanced processing unit.

Concentrated water, such as impurities removed during the high-level treatment, is treated with high-pressure treatment by injecting ozone at 50 to 150 ppm for 30 minutes to 90 minutes in an ozone supply device.

Ozone is used in the advanced treatment.

The ozone treatment method is divided into a control method based on the amount of water treated, a control method based on the dissolved ozone concentration, and a control method based on the ozone concentration. The control by the amount of treatment is used for all ozone treatment and the like by setting the ozone injection rate by pilot experiments and measuring the amount of treatment to control the ozone injection amount. This is the most commonly used method has the advantage that the response time is fast, but has the disadvantage that the ability to cope with sudden changes in water quality is poor.

The control method based on dissolved ozone concentration is used for post-ozone treatment. It is used to set ozone concentration in advance and to measure the amount of ozone injected by measuring the dissolved ozone at the outlet of the contact point. Agility can cope with changes in water quality, but it can be used only when the fluctuations in the amount of treatment are small, and the disadvantages of precision decrease due to the concentration of dissolved substances such as iron and manganese in water.

The control method based on the ozone concentration controls the ozone injection amount by setting the ozone concentration and measuring the discharged ozone concentration, which is advantageous for the application of sewage treatment plants and wastewater treatment, and can cope with changes in water quality. The controllable emission ozone is also measured over the range, so there is no risk of clogging the detector.

In the present invention, among the ozone treatment methods, control by ozone concentration is preferably used. However, the present invention is not necessarily limited thereto, and a person of ordinary skill in the art can easily design and change the process in consideration of the treatment capacity and the physical properties of the wastewater.

The wastewater to be treated is pumped through a injector by pumping some or the necessary amount for ozone injection, and ozone is injected. In addition, the ozone injected by using a dissolving device is mixed with the total flow rate to treat the ozone concentration, and the amount of ozone discharged is measured to control the ozone injection amount. If it is discharged for 1 ~ 5 minutes, sterilization and discoloration will be done. If it is injected for more than 10 ~ 30 minutes, BOD and COD will be removed.

The following experiment was carried out to confirm the sewage treatment effect of the present invention. The result of treating wastewater using a single reaction tank consisting of a contact aeration tank, a settling tank and a filtration tank only (Example 1), and a result of treating wastewater by adding a biological treatment tank to the single reaction tank (Example 2) and a single biological treatment tank added The treatment result (Example 3) through the treatment device in which the advanced treatment unit was connected to the reaction tank, and the result of treating the wastewater with a single reaction tank to which the biological treatment tank was added and the electrolysis device were shown (Example 4). Specific embodiments are as follows.

Example 1 Treatment of Sewage Water Using a Single Reactor

Wastewater containing organic substances (TOC 22mg / L, COD 20mg / L, Cond. 1492μs / cm, TN 7.5mg / L, TP 0.6 mg / L) generated in the process of LCD parts C / F and P / F Purified.

For this purpose, the contact aeration tank, the settling tank, and the filtration tank were connected in series to form a single reaction tank, and the wastewater was discharged at a rate of 15,000 m ³ / day for 2 hours, and then ethylenediaminetetraacetic acid (EDTA) as a scale inhibitor in the settling tank. Was added at a rate of 200 ml / hr. The results are shown in Table 1 below.

[Treatment Result of Sewage Water Using Single Reactor] Influent Runoff Flow rate Q (m ³ / day) 15,000 15,000 TOC (mg / L) 22 21.5 COD (mg / L) 20 19.3 Cond. 1492 1300 T-N (mg / L) 7.5 4.5 T-P (mg / L) 0.6 0.5

Example 2 Treatment of Sewage Water Using a Single Reaction Tank Added with a Biotreatment Tank

In order to treat the same wastewater as in Example 1, a biological treatment tank and a filtration tank were connected in series, and then separated through partitions to produce a single reaction tank.

To the biotreatment tank, Thiobacillus denitrificans was introduced as a microorganism at a flow rate of 3.75 kg / hr. Oxygen was introduced for 5.3 hours at a flow rate of 2250 l / min through the air supply pipe between the biological treatment tank and the settling tank to measure the concentration of the microorganisms.

Ethylenediaminetetraacetic acid (EDTA) was added at a rate of 200 ml / hr as a scale inhibitor in the endogenous step. The results are shown in Table 2 below.

[Results of Treatment of Sewage Wastewater Using a Single Reactor with Biotreatment] Influent Runoff Flow rate Q (m ³ / day) 15,000 15,000 TOC (mg / L) 22 20 COD (mg / L) 20 18.5 Cond. 1492 1300 T-N (mg / L) 7.5 3.3 T-P (mg / L) 0.6 0.4

Example 3 Wastewater Treatment Combined with Single Reactor and Ozone Treatment Unit

It carried out similarly to Example 2, connecting a biological treatment tank, a filtration tank, and an ozone treatment part in series. The wastewater passed through the filtration step was transferred to the ozone treatment unit, and ozone was injected at 100 ppm for 60 minutes. The results are shown in Table 3 below.

[Treatment result of sewage water combining a single reactor and ozone treatment unit] Influent Runoff Flow rate Q (m ³ / day) 15,000 15,000 TOC (mg / L) 22 14.4 COD (mg / L) 20 15.5 Cond. 1492 1300 T-N (mg / L) 7.5 1.5 T-P (mg / L) 0.6 0.4

Example 4 Wastewater Treatment Combined with Single Reactor and Electrolysis Treatment System

The same procedure as in Example 2 was carried out, and the wastewater was subjected to filtration to NaOCl as a sample and subjected to electrolysis for 30 minutes by 0.2 ml / L under conditions of 2A / l × 8V. The results are shown in Table 4 below.

[Sewage Wastewater Treatment Result Combining Single Reactor and Electrolysis Treatment Unit] Influent Runoff Flow rate Q (m ³ / day) 15,000 15,000 TOC (mg / L) 22 19.5 COD (mg / L) 20 16.5 Cond. 1492 1300 T-N (mg / L) 7.5 3.0 T-P (mg / L) 0.6 0.4

According to the results of the above examples and tables, it was found that the wastewater treatment apparatus combining the single reaction tank containing the biological treatment tank with the ozone treatment unit as in the present invention is the most excellent in the treatment efficiency and sludge content of the concentrated water. in the content of the TN for showing a 34% and 80% removal efficiency, respectively, which generator oxygen in an ozone reaction vessel [O] and hydroxyl group [OH ^-] to the destruction result contaminants by the direct oxidation and indirect oxidation caused by It becomes a pool.

10: screen tank 20: biological treatment tank 30: filtration tank
31: MF membrane, UF membrane 32: air supply pipe 33: backwash device
40: high processing unit 41: RO membrane 50: air supply means
60: ozone generator

Claims (3)

In the wastewater recycling water production apparatus for effectively recycling the wastewater introduced through the screen tank (10),
The wastewater recycling water production apparatus includes a single reactor; It is composed of an advanced processing unit 40,
The single reactor
A biological treatment tank 20 in which microorganisms are operated in an endogenous stage after exponential growth by prolonging the retention time of the microorganisms in order to decompose and remove the organic material and nitrogen of the introduced wastewater using microorganisms;
It consists of a filtration tank 30 for filtering the inorganic material not removed from the biological treatment tank through the MF or UF membrane,
The filtration tank has a precipitation function capable of maintaining a large amount of microorganism concentration by solid-liquid separation through the MF or UF membrane 31; A filtration function for filtering the colloidal substance; It performs a disinfection function to remove pathogenic microorganisms by 0.45㎛ pore,
An air supply pipe 32 and a backwashing device 33 are attached to a lower portion of the filtration tank so that oxygen is aerated through the air supply pipe 32 to promote the growth of microorganisms, and when the microorganisms are excessive, the backwashing device (33) is used to desorb microorganisms attached to the surface of the MF or UF membrane 31,
The advanced treatment unit 40 is a wastewater recycled water production apparatus, characterized in that it is operated to recycle the treated water filtered in a single reactor using the RO membrane 41 to recycle it. The method of claim 1,
The advanced treatment unit 40 is a wastewater recycled water production apparatus, characterized in that the advanced treatment by injecting ozone into the concentrated water filtered using the RO membrane 41 at 50 ~ 150ppm for 30 minutes to 90 minutes. Introducing the wastewater having passed through the screen tank (10) into the biological treatment tank (20) of a single reaction tank consisting of the biological treatment tank (20) and the filtration tank (30);
Decomposing and removing the organic materials contained in the wastewater introduced into the biological treatment tank 20 by using microorganisms present in the endogenous stage;
Filtering the inorganic material and the colloidal material by transferring the wastewater from which the organic material is removed to the filtration tank 30 to which the MF or UF membrane 31 is attached;
Transporting the sewage water from which the inorganic material and the colloidal material are filtered in the filtration tank 30 to the advanced processing unit 40 to which the RO membrane 41 is attached to generate RO concentrated water;
Injecting the concentrated water produced in the advanced processing unit 40 using ozone generator 60 for 30 minutes to 90 minutes in an ozone 50 ~ 150ppm; advanced processing; recycling the sewage water, characterized in that consisting of

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