KR20240001354A - Wastewater treatment system - Google Patents

Abstract

The present invention is a technology for a device for treating wastewater containing high concentrations of organic matter and volatile substances (TOC/DOC), specifically using an evaporation concentration unit and a microbial treatment unit to reuse or discharge condensate contained in the form of volatile or azeotropic compounds. This relates to a wastewater treatment system that ensures water quality to An evaporation and concentration unit that receives wastewater from the wastewater, heats it to a predetermined temperature, evaporates it, and supplies the condensed water to a condensation tank; an ozone supply unit that sterilizes the condensate by supplying ozone gas to the condensate obtained from the evaporation and concentration unit; and an ozone supply unit. It includes a microbial treatment unit that decomposes organic matter in the sterilized treated water using microorganisms, wherein the wastewater treatment system measures the absorbance of the treated water between the ozone supply unit and the microbial treatment unit and determines the difference between the stored reference value and the measured value. Accordingly, it is characterized in that it further includes an absorbance measurement unit for the control unit to determine whether or not to supply treated water to the microbial treatment unit.

Description

Wastewater treatment system containing high concentration of organic and volatile substances {WASTEWATER TREATMENT SYSTEM}

The present invention is a technology for a device for treating wastewater containing high concentrations of organic matter and volatile substances (TOC/DOC), specifically using an evaporation concentration unit and a microbial treatment unit to reuse or discharge condensate contained in the form of volatile or azeotropic compounds. It is about a wastewater treatment system that ensures water quality.

Typically, wastewater containing high concentrations of organic matter or volatile pollutants discharged from food processing plants, etc. is transported to a consignment company equipped with wastewater treatment facilities and purified.

A consignment company equipped with wastewater treatment facilities generally evaporates the entrusted wastewater using an evaporator. The concentrated water remaining after evaporation is entrusted to a secondary consignment treatment company, and the condensed water after evaporation as described above is It is treated with microorganisms by the MBR system and discharged.

However, in the case of wastewater containing high concentrations of TOC and COD, it is still contained in the condensate in the form of volatile or azeotropic compounds, so such condensate cannot secure water quality for reuse or discharge even if it is microbially treated by a typical MBR system. There was a problem that couldn't be resolved.

In particular, in the case of wastewater containing high concentrations of TOC and COD, including preservatives, there is a problem that microorganisms die even if microbial treatment is attempted.

For this reason, existing wastewater treatment devices cannot treat wastewater containing high concentrations of organic matter or volatile pollutants, so there is a problem that condensate cannot be reused or discharged because the TOC/DOC concentration is still high.

In order to improve this, the conventional technology used is to apply advanced oxidation treatment to decompose difficult-to-remove substances, and in particular, removal using hydroxyl radicals has been applied. However, advanced oxidation treatment using UV + hydrogen peroxide still has the problem of slow decomposition and increased sludge generation when wastewater input is excessive.

Accordingly, the inventor of the present invention came up with a wastewater treatment system using a new ozone contact tank that can simultaneously reduce wastewater treatment costs and reduce carbon dioxide (CO2) emissions.

Domestic registered patent No. 10-0585960 (announcement date: 2006.06.07.) Domestic registered patent No. 10-1840548 (announcement date: 2018.05.08.) Domestic registered patent No. 10-2208641 (announcement date: 2021.01.28.) Domestic registered patent No. 10-2177110 (announcement date: 2020.11.10.)

In order to solve the above-described conventional problems, the purpose of the present invention is to provide a wastewater treatment device that can secure treated water containing a high concentration of organic or volatile substances at a discharge level.

In addition, another purpose is to provide a wastewater treatment device that can prevent microbial contamination in the backwash system by improving the structure of the conventional backwash pump and backwash tank.

In order to solve the above-described technical problem, the wastewater treatment system containing high concentrations of organic matter and volatile substances according to the present invention is a wastewater treatment system for treating wastewater containing high concentrations of TOC or COD. An evaporation and concentration unit (100) that receives wastewater from the receiving waste collection tank (110), heats it to a predetermined temperature, evaporates it, and then supplies condensate to the condensation tank (120), and condensate obtained from the evaporation and concentration unit (100). An ozone supply unit 200 that sterilizes condensate by supplying ozone gas to the ozone supply unit 200 and a microbial treatment unit 300 that decomposes organic matter in the treated water sterilized in the ozone supply unit 200 by microorganisms, wherein the wastewater treatment system After measuring the absorbance of the treated water between the ozone supply unit 200 and the microorganism treatment unit 300, the control unit determines whether to supply the treated water to the microorganism treatment unit 300 according to the difference between the stored reference value and the measured value. It is characterized in that it further includes an absorbance measuring unit 400 for.

In addition, in the evaporation and concentration unit 100, based on 100% of the total amount of wastewater supplied from the waste collection tank 110, 80 to 90% is condensed after evaporation and stored as condensate in the condensation tank 120, with the remaining 10 to 20%. % is preferably separated and treated as concentrated water.

In addition, the evaporation and concentration unit 100 further includes a concentration measurement sensor 130, where the concentration measurement sensor 130 is installed at the output end of the condensation water tank 120 to determine the concentration of foreign substances discharged, and is installed in the control unit. After providing measurement information to check whether the discharged condensate is suitable for the set value for supply to the ozone supply unit 200, if it falls short, the condensate is bypassed to the input terminal of the evaporation and concentration unit 100, so that only the condensate that reaches the set value is used. It is desirable to ensure that ozone can be supplied to the ozone supply unit 200.

In addition, the ozone supply unit 200 includes an ozone generator 210 that produces and provides ozone through oxygen supplied from the outside, and a dissolution tank in which ozone generated in the ozone generator 210 and condensate are mixed and dissolved. (220), an exhaust ozone treatment unit 230 in which the undissolved ozone is processed after receiving it in the dissolution tank 220, and the ozone supplied to the dissolution tank 220 is accommodated in the dissolution tank 220. It is preferable to include a microbubble generator 240 that generates microbubbles so that they can stay in the condensate for a long time.

In addition, the microorganism treatment unit 300 includes a plurality of settling tanks 310 that receive treated water from the ozone supply unit 200, and filters the treated water discharged from the settling tank 310 to produce secondary treated water. A plurality of filtration membranes 320 to be obtained, a filtration pump (P) for forcibly sucking and then discharging the treated water contained in the sedimentation tank 310 to obtain secondary treated water through the filtration membranes 320, and the filtration One end is connected to the suction pipe 341 with the header 330 collecting the secondary treatment water discharged from the pump (P) and the filtration pump (P) in between, and the other end is connected to the discharge pipe 343 for secondary treatment. It is preferable that the bypass pipe 340 includes a bypass pipe 340 that enables a water backwashing process, and that the bypass pipe 340 is provided with a valve whose opening and closing is controlled by a controller.

According to the present invention, the use of an ozone supply unit with a new structure, which is different from the conventional one, has the effect of realizing the acquisition of treated water by quickly reacting the dissolved ozone and condensate water.

In addition, unlike the conventional method, the absorbance measurement unit is used to measure the degree of decomposition of non-decomposable substances and the amount of ozone to promote ozone contact reaction can be controlled by the control unit.

In addition, unlike the conventional method, the microorganism treatment unit includes a filtration pump and a bypass pipe, which has the effect of fundamentally preventing contamination caused by the conventional backwash pump and backwash line.

1 is a conceptual diagram showing the application of the treatment unit of the first embodiment to the wastewater treatment system containing high concentrations of organic matter and volatile substances according to the present invention.
Figure 2 is a conceptual diagram showing the application of the treatment unit of the second embodiment to the wastewater treatment system containing high concentrations of organic matter and volatile substances according to the present invention.
Figure 3 is a conceptual diagram of an ozone supply unit for a wastewater treatment system containing high concentrations of organic and volatile substances according to the present invention.
Figure 4 is a conceptual diagram showing an evaporation and concentration unit for a wastewater treatment system containing high concentrations of organic matter and volatile substances according to the present invention.
Figure 5 is a conceptual diagram of an ozone supply unit for a wastewater treatment system containing high concentrations of organic and volatile substances according to the present invention.
Figure 6 is a conceptual diagram showing a microbial treatment unit for a wastewater treatment system containing high concentrations of organic matter and volatile substances according to the present invention.

Hereinafter, various embodiments will be described in more detail with reference to the attached drawings. The embodiments described herein may be modified in various ways. Specific embodiments may be depicted in the drawings and described in detail in the detailed description. However, the specific embodiments disclosed in the attached drawings are only intended to facilitate understanding of the various embodiments. Therefore, the technical idea is not limited to the specific embodiments disclosed in the attached drawings, and it should be understood that all equivalents or substitutes included in the spirit and technical scope of the invention are included.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but these components are not limited by the above-mentioned terms. The above-mentioned terms are used only for the purpose of distinguishing one component from another.

In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

In addition, when describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof is abbreviated or omitted.

Hereinafter, with reference to the attached drawings, the wastewater treatment system containing high concentrations of organic matter and volatile substances according to the present invention (hereinafter, simply referred to as 'wastewater treatment system') will be described in detail for each embodiment.

First, as shown in Figures 1 and 2, the wastewater treatment system 1 according to the present invention largely includes an evaporation concentration unit 100, an ozone supply unit 200, a microorganism treatment unit 300, and a treatment unit 500. do.

In more detail, the evaporation and concentration unit 100 is configured to receive wastewater contained in the waste water collection tank 110 and evaporate the waste water through heating, as shown in FIGS. 1 and 3. The wastewater is heated to a temperature of about 80° C. under a pressure of 0.03 bar to evaporate.

For example, 80 to 90% of the wastewater evaporated through heating of the evaporation and concentration unit 100 is condensed after evaporation based on 100% of the total amount of wastewater supplied from the waste collection tank 110 and is sent to the condensation tank 120 as condensate. It is stored, but the remaining 10 to 20% is separated and stored separately as concentrated water so that it can be treated through consignment treatment. The wastewater treatment system (1) in the present invention uses organic substances and volatile substances (hereinafter referred to as This is to dispose of (referred to as ‘foreign substances’). Meanwhile, the recovery conditions for condensate are set at a recovery rate of 80 to 90% by fixing the total solid concentration. If the recovery rate is set too high, the energy used in the condensate is high, making it uneconomical.

For this purpose, a concentration measurement sensor 130 for measuring the concentration of foreign substances may be additionally applied to the evaporation and concentration unit 100, and the concentration measurement sensor 130 is installed at the output end of the condensation water tank 120. The measurement information is provided to the control unit (not shown), so that it can be determined whether or not the condensed water is supplied to the ozone supply unit 200, which will be explained later.

At this time, between the condensation water tank 120 and the ozone supply unit 200, there is a piping structure for re-supplying condensed water to the input side of the ozone supply unit 200 or the evaporation and concentration unit 100 by an openable valve (V). It is desirable.

That is, after the concentration measurement sensor 130 measures the concentration of foreign substances contained in the condensate discharged through the evaporation and concentration unit 100, if the measurement information is determined to be higher than the set value stored in the control unit, the control unit operates the valve (V). Through control, the condensed water is not supplied to the ozone supply unit 200, but is re-supplied to the input side of the evaporation and concentration unit 100, enabling a repeated evaporation process until the concentration reaches the set value.

And, as shown in FIGS. 1 and 4, the ozone supply unit 200 supplies ozone gas as fine bubbles to the condensate water supplied from the evaporation and concentration unit 100, thereby increasing the dissolution rate of the ozone gas. It is configured to sterilize foreign substances contained in condensate and includes an ozone generator 210, a dissolution tank 220, an ozone treatment unit 230, and a microbubble generator 240.

For example, the ozone generator 210 is configured to supply ozone to sterilize foreign substances contained in condensate.

For this purpose, the ozone generator 210 generates ozone using oxygen in the air, and the generated ozone is supplied to the dissolution tank 220 along with fine bubbles, and the water supplied into the dissolution tank 220 mixes with the ozone. This allows sterilization to take place.

The ozone generator 210 enables the generation of ozone using a method of micro-discharging plasma within a minimum of 85㎛ to a maximum of 95㎛, thereby improving energy efficiency by minimizing power use.

The ozone generator 210 uses a cell type and has the ability to generate up to 120 g/hr ozone, and uses oxygen contained in the air flowing into the ozone generator 210 from the outside to maximize the sterilization effect of foreign substances. Of course, it is possible to additionally produce OH Radical, and the ozone used for sterilization is reduced to oxygen and can be exhausted.

In addition, the dissolution tank 220 is configured to allow the generated ozone and condensate to melt together within a defined space, and for this purpose, an ozone generator 210 and a condensation water tank 120 are installed on the outer surface of the dissolution tank 220. ) and the microbubble generating unit 240 each have a structure connected to a pipe (PIPE).

Here, the dissolution tank 220 has a fine bubble generator (240) so that the supplied ozone stays in the condensate for a long time (ozone dissolved rate) and improves the contact rate between the condensate and ozone, that is, the effect of quickly sterilizing foreign substances. ) so that ozone can be provided in the form of microbubbles to the condensate.

In addition, the waste ozone, which refers to the condensate and undissolved excess ozone in the dissolution tank 220, can be received and treated in the tank-shaped waste ozone treatment unit 230 along with the sludge generated when sterilizing the condensate. .

Furthermore, the wastewater treatment system 1 in the present invention is further provided with an absorbance measuring unit 400 capable of measuring the absorbance of the treated water sterilized by the ozone supply unit 200 described above, and the reference value stored in the control unit By comparing the measured values of the absorbance measuring unit 400, it is possible for the control unit to determine whether or not the treated water is supplied to the microbial treatment unit 300, which will be described later.

Here, the absorbance measuring unit 400 is used to determine the degree of decomposition of non-decomposable substances contained in the treated water after obtaining treated water in which the condensate has been sterilized through an ozone contact reaction between ozone and condensate, and the absorbance The measuring unit 400 is set to 0.5 abs or less so that the degree of injection of ozone through the ozone generating unit 210 can be controlled by the control unit. The reason why the absorbance is set below 0.5abs is because microbial decomposition is possible. In other words, if the absorbance of the treated water is more than 0.5abs, it is difficult to treat it with microorganisms alone.

And, as shown in FIGS. 1 and 5, the microbial treatment unit (MBR: membrane bio reactor) is configured to repeatedly treat the treated water obtained through the ozone supply unit 200 described above with microorganisms.

For example, the microbial treatment unit 300 eliminates the conventional backwash pump and backwash water tank and performs series-specific backwashing with MBR treated water within the shortest distance using a plurality of filtration pumps (P) and the header 330 of the series-specific treated water line. This allows the filtration pump (P) to directly function as a backwash pump.

As shown, when a plurality of microorganism treatment units 300 are installed and operated in parallel for each series, the microorganism treatment unit 300 sequentially backwashes and cleans each series.

For this purpose, each microbial treatment unit 300 is equipped with a filtration pump (P) that forcibly sucks treated water from a tank-shaped sedimentation tank 310 to obtain secondary treated water filtered through a filtration membrane 320, and the sedimentation tank 310. ), a suction pipe 341 connecting the filtration pump (P) to each other, a discharge pipe 343 connected to the output end of the filtration pump (P) for discharging secondary treated water, and each of the discharge pipes 343 together. It includes a header 330 connected to the header 330 and a main pipe 350 that transfers the secondary treated water flowing into the header 330 to the treatment unit 500, which will be described later.

In addition, the microbial treatment unit 300 may have a structure capable of discharging sludge generated during repeated treatment of treated water by microorganisms to the outside.

Here, a backwashing process is necessary to clean the filtration membrane, and for this purpose, the present invention is provided with a bypass pipe 340 that bypasses each filtration pump (P) provided between the discharge pipe 343 and the suction pipe 341. , the secondary treated water discharged from the adjacent filtration pump (P) can be supplied to the sedimentation tank 310 that requires backwashing and used as backwashing water.

For this backwashing process, an opening/closing valve may be provided to send the backwashing water present in the header 330 connecting the discharge pipes 343 connected from the plurality of filtration pumps P to the reverse direction of the filtration membrane.

Therefore, more than one filtration membrane can be backwashed at the same time by an on-off valve. Basically, when you want to backwash the filtration membrane, the 2 filtered through the remaining filtration pumps (P) except for the filtration pump (P) used for backwashing. The primary treated water is directly supplied to the header 330, and the filtration pump (P), which acts as a backwash, moves the secondary treated water through the bypass pipe 340 so that it can be used as backwash water.

Through this, the wastewater system according to the present invention, unlike the prior art, has the advantage of not requiring a separate backwash pump connected to the treatment tank to supply backwash water and a backwash pipe connected to the backwash pump and the suction pipe.

And, as shown in FIGS. 1 and 2, the treatment unit 500 is used to filter and reuse the secondary treated water obtained through the above-described microorganism treatment unit 300 or to discharge it into a river, etc. In this configuration, the non-discharge method for reuse of the processing unit 500 in the present invention is referred to as the first embodiment (see FIG. 1), and the discharge method is referred to as the second embodiment (see FIG. 2).

First, the treatment unit 500, which is the first embodiment, includes a reverse osmosis unit 510 including a treatment tank 530 and a reuse tank 520.

One side of the reverse osmosis unit 510 is connected to the microorganism treatment unit 300 through a pipe to receive secondary treatment water and stored therein, while the other side receives secondary treatment water from the treatment water tank 530 connected to the reverse osmosis unit 510 through a pipe. Treated water is supplied, and residual foreign substances contained in the secondary treated water are removed using at least one reverse osmosis filter (not shown) to obtain tertiary treated water.

In addition, the obtained tertiary treated water is stored in another tank-shaped reuse tank 520 and supplied to other workplaces for reuse.

In addition, the processing unit 500 of the second embodiment includes a reverse osmosis unit 510, a water collection tank 540, and a filtering unit 550, and the reverse osmosis unit 510 is the reverse osmosis unit 510 of the first embodiment described above. Since it has the same structure as the unit 510, detailed description will be omitted.

However, unlike the first embodiment, the reverse osmosis unit 510 in the second embodiment receives treated water from another water purification facility (not shown) rather than filtering the secondary treated water to produce RO concentrated water. They are different from each other in that they have a structure for supplying water to the water collection tank 540.

Here, the water collection tank 540 receives the RO concentrated water discharged from the reverse osmosis unit 510 and the secondary treated water obtained from the above-described microbial treatment unit 300, mixes them, and supplies them to the filtering unit 550. has

In addition, the filtering unit 550 uses a filter (not shown) made of activated carbon and has a structure that filters and then discharges the mixed water of RO concentrated water and secondary treatment water from the water collection tank 540.

Meanwhile, the treatment unit 500 according to the first and second embodiments of the present invention determines the concentration of the tertiary treated water before being accepted into the reuse tank 520 or the tertiary treated water to be discharged after the filtering unit 550. After measuring with the sensor (S) and comparing it with the standard value set in the control unit, if the measured concentration value falls below the standard value, it is possible to repeat the filtering by the filter by re-supplying it to the reverse osmosis unit ().

As described above, the wastewater treatment system 1 according to the present invention uses an ozone supply unit 200 of a new structure, which is different from the conventional one, to achieve the effect of obtaining treated water by quickly reacting the dissolved ozone and condensate water. You will have

In addition, differently from the conventional method, the absorbance measuring unit 400 can be used to measure the degree of decomposition of non-decomposable substances and the amount of ozone to promote ozone contact reaction can be controlled by the control unit.

In addition, unlike the conventional one, the cause of contamination caused by the conventional backwash pump and backwash line can be fundamentally prevented through the microorganism treatment unit 300, which includes a filtration pump (P) and a bypass pipe 340. It will have an effect.

As described above, the present invention has been described with specific details such as specific components and limited embodiments and drawings, but this is only provided to facilitate a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those skilled in the art can make various modifications and variations from this description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described later as well as all things that are equivalent or equivalent to the scope of this patent claim shall fall within the scope of the spirit of the present invention. .

1: Wastewater treatment system containing high concentration of organic and volatile substances according to the present invention
100: Evaporation and concentration unit
110: Waste collection tank 120: Condensation tank
130: Concentration measurement sensor
200: Ozone supply unit
210: Ozone generator 220: Dissolution tank
230: Beozone processing unit 240: Microbubble generating unit
300: Microbial treatment unit
310: sedimentation tank 320: filtration membrane
330: header 340: bypass pipe
400: Absorbance measurement unit
500: processing unit
510: Reverse osmosis unit 520: Reuse tank
530: Treatment tank 540: Collection tank
550: Filtering unit

Claims (5)

In the wastewater treatment system for treating wastewater containing high concentrations of TOC or COD, the wastewater treatment system
An evaporation and concentration unit 100 that receives wastewater from the wastewater collection tank 110, heats it to a predetermined temperature, evaporates it, and then supplies the condensed water to the condensation tank 120;
An ozone supply unit (200) that sterilizes the condensate by supplying ozone gas to the condensate obtained from the evaporation and concentration unit (100); and
It includes a microorganism treatment unit 300 that decomposes organic matter in the treated water sterilized in the ozone supply unit 200 by microorganisms,
The wastewater treatment system measures the absorbance of treated water between the ozone supply unit 200 and the microorganism treatment unit 300, and then determines whether to supply treated water to the microorganism treatment unit 300 based on the difference between the stored reference value and the measured value. A wastewater treatment system containing high concentration organic matter and volatile substances, further comprising an absorbance measuring unit 400 for determination by the control unit.
According to paragraph 1,
The evaporation and concentration unit 100 is
Based on 100% of the total amount of wastewater supplied from the waste collection tank 110, 80 to 90% is condensed after evaporation and stored as condensate in the condensation tank 120, while the remaining 10 to 20% is separated and treated separately as concentrated water. A wastewater treatment system containing high concentrations of organic and volatile substances.
According to paragraph 1,
The evaporation and concentration unit 100 further includes a concentration measurement sensor 130,
The concentration measurement sensor 130 is
It is installed at the output end of the condensation water tank 120 to specify the concentration of foreign substances discharged. Measurement information is provided to the control unit to check whether the discharged condensate meets the set value for supplying to the ozone supply unit 200. If it is lower, A wastewater treatment system containing high concentration organic matter and volatile substances, characterized in that the condensate is bypassed to the input terminal of the evaporation and concentration unit (100) so that only condensate water reaching a set value is supplied to the ozone supply unit (200).
According to paragraph 1,
The ozone supply unit 200 is
An ozone generator 210 that produces and provides ozone through externally supplied oxygen;
A dissolution tank (220) in which the ozone generated in the ozone generator (210) and condensate are mixed and dissolved together;
an ozone treatment unit 230 in which undissolved ozone is received and processed in the dissolution tank 220; and
A high-concentration organic matter comprising a microbubble generator 240 that generates microbubbles so that the ozone supplied to the dissolution tank 220 can stay in the condensate contained in the dissolution tank 220 for a long time. Wastewater treatment system containing volatile substances.
According to paragraph 1,
The microorganism treatment unit 300 is
A plurality of settling tanks 310 for receiving treated water from the ozone supply unit 200;
A plurality of filtration membranes 320 for filtering the treated water discharged from the settling tank 310 to obtain secondary treated water;
a filtration pump (P) that forcibly suctions and then discharges the treated water contained in the sedimentation tank 310 in order to obtain secondary treated water through the filtration membrane 320;
A header 330 that collects secondary treated water discharged from the filtration pump (P); and
A bypass pipe (340) with one end connected to the suction pipe (341) with the filtration pump (P) in between, and the other end connected to the discharge pipe (343) to enable a backwashing process with secondary treated water. ,
A wastewater treatment system containing high concentrations of organic and volatile substances, characterized in that the bypass pipe 340 is equipped with a valve whose opening and closing is controlled by a controller.

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