KR101182797B1 - Water Treatment Facilities - Google Patents

Abstract

The present invention relates to a device capable of highly treating sewage water or water, a bulk biofilm carrier selected from porous foamed resin in which pores communicate with each other, woven or nonwoven fabric with a cilia layer formed on at least one surface thereof, and ropes with protruding fibers (7). ) And a biofilm contacting tank (1) filled with a granular biofilm carrier (6) filled with biological particles and having a biological treatment, and an inflow of the first reaction tank (3) and the biofilm contacting tank ( 1) to be processed while going through sequentially, the bioreactor to detach the bulk biofilm carrier (7) in the first reaction tank (3) and the biofilm attached to the granular biofilm carrier (6) in the biofilm contact tank (1) Each of the granular biofilm carriers 6 filled with the biofilm contacting tank 1 is formed so that its apparent specific gravity in the particle size and in the dry state is in the range of 2.0 to 35 mm and 0.85 to 2.75, respectively. Or by providing a water treatment device, it characterized in that a screening, it is possible to process the organic matter (BOD) and suspended solids (SS), total nitrogen (TN) and total phosphorus (TP) in an economical and highly efficient.

Description

Water Treatment Facilities

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment apparatus, which is used for sewage and initial rainwater and water treatment, and in particular, contaminants and eutrophication agents contained in sewage water in a limited space, such as TN (Total Nitrogen: Total Nitrogen), TP (Total Phosphorus: Total Phosphorus). The present invention relates to a water treatment apparatus capable of removing the same) at high efficiency.

Precipitation is unevenly distributed throughout the year, and as water demands such as river maintenance water, industrial water, and irrigation water in the dry season increase, the advanced treatment technology of wastewater for reuse of water, and the advanced water treatment due to eutrophication and pollution of the water system Technology is desperately needed.

However, conventional hollow fiber membranes have low removal efficiency of dissolved contaminants such as TN, TP, and organic matter represented by dissolved BOD (Biochemical Oxygen Demand), and are mainly used to remove suspended solids (SS). It is limited, and the cost of facility and maintenance is very large, which is inefficient and inefficient.

In addition, the biofilter equipped with the conventional biofilm contact function and the filtration function at the same time has the advantage that the solid-liquid separation function and the decomposition function of the dissolved organic matter is provided, but it is difficult to remove the TN, TP and high inlet BOD load The disadvantage is that the statue is easily closed.

Accordingly, the present invention is to solve the above problems, it is equipped with biological treatment and physical filtration function, it is possible to treat influent water with high BOD load, and SS, BOD, TN, TP can be removed economically and with high efficiency. It is an object of the present invention to provide a water treatment apparatus having a compact structure.

In the water treatment apparatus according to the present invention for achieving the above object, the water treatment apparatus comprising a biofilm contact tank that is biologically treated by a microorganism attached to the biofilm carrier, and the biofilm carrier filled in the biofilm contact tank, the biofilm The carrier may be composed of a scrubbed biofilm carrier composed of overlapping fibers or a bulk biofilm carrier or granular biofilm carrier, and the biofilm carrier may be configured differently depending on the purpose of treatment.

First, when the main purpose is to remove BOD or denitrification of nitrogen oxides in the biofilm contact tank, a large amount of microorganisms should be attached and multiply and the reaction solution should be sufficiently mixed. Under these reaction conditions, the biofilm carrier is advantageous because the specific surface area of the biofilm carrier is large and the surface area to which microorganisms can be attached is large, and the porosity is large, so that fluid communication is smooth. Therefore, the biofilm contact tank is filled with a porous biofilm carrier selected from a porous foamed resin in which pores communicate with each other, a woven or nonwoven fabric having a cilia layer formed on at least one surface thereof, and a rope in which fibers are densely projected, or a scrubbed biofilm carrier having fibers overlapped. do.

The scrubber biofilm carrier and the bulk biofilm carrier may be installed in a fixed bed that does not flow in a reaction tank or interpolated inside a hole casing composed of a net or the like to be filled with a fluidized bed or a fixed bed. In the biofilm contact tank filled with the scrubbed biofilm carrier or the bulk biofilm carrier, even when the inlet BOD concentration is high, the carrier is not closed well, and when the SS concentration is low, the SS is attached to and removed from the biofilm. However, when the SS concentration is high, SS may flow through the effluent, so it is common to install a subsequent process for SS removal.

Second, when the BOD load is low in the biofilm contact tank and the primary purpose of SS removal is to fill the biofilm contact tank with a granular biofilm carrier capable of exhibiting a filtration function for SS removal rather than maintaining a large amount of biomass. desirable. Granular biofilm carriers include granular synthetic resin moldings, granular foaming resins, granular activated carbon, granular ceramics, fine sand dune formed by agglomeration of fine sand, granular moldings made of ceramic powder and synthetic resin mixture, granular moldings coated ceramic with synthetic resin, It may be composed of materials and forms such as granular moldings made of a mixture of synthetic resins and animal and plant materials.

When the biofilm contact tank is selected from these granular biofilm carriers and filled into the biofilm contact tank, the microorganisms attached to the granular biofilm carriers carry a filter function that simultaneously performs physical filtration along with biological reactions such as nitrification and removal of residual BOD. Subsequent steps to remove the reaction can be omitted and nitrification can be carried out under aerobic conditions.

In addition, in the water treatment apparatus according to the present invention, a first reaction tank is installed at a previous stage of the biofilm contact tank filled with the particulate biofilm carrier, and the first reaction tank mainly performs a biological reaction such as aerobic decomposition of BOD or denitrification under anoxic conditions. In the biofilm contact bath, which is a subsequent process, the residual BOD may be decomposed or nitrified, and a filtration function for removing SS may be a main purpose. In addition, by configuring a water treatment device equipped with an internal circulation device for flowing back the reaction liquid from the biofilm contact tank to the first reaction tank, in the biofilm contact tank of the water treatment device organic nitrogen and ammonia nitrogen is nitrified to nitrate nitrogen In the first reaction tank, the denitrification reaction in which the nitrate nitrogen introduced into the backflow is reduced to free nitrogen may be performed to increase the nitrogen removal rate. Here, the first reaction tank mainly for biological reaction was filled with a bulk biofilm carrier, and the biofilm contact tank was filled with a granular biofilm carrier equipped with a filtration function to remove SS.

In addition, in the water treatment apparatus according to the present invention, a second reaction tank is installed at the rear end of the biofilm contact tank filled with the scrubbed biofilm carrier, and in the biofilm contact tank, a biological reaction such as aerobic decomposition of BOD or denitrification reaction under anoxic conditions is mainly performed. In the second reactor, which is a subsequent process, the distribution of residual BOD or nitrification may be performed, and the main function may be a filtration function to remove SS. In addition, by configuring a water treatment device equipped with an internal circulation device for the flow of the reaction liquid flows back to the water treatment device from the second reaction tank, the nitrification is carried out in the second reaction tank and the denitrification reaction in the biofilm contact tank of the water treatment device It can be made to increase the nitrogen removal efficiency. Here, the biofilm contact tank mainly for biological reaction was filled with the scrubbed biofilm carrier, and the second reactor was filled with a granular biofilm carrier equipped with a filtration function to remove the SS.

When the water treatment apparatus according to the present invention having the configuration as described above is used for advanced wastewater treatment and water purification treatment, as well as denitrification of nitrate nitrogen, nitrification and denitrification of ammonia nitrogen and organic nitrogen are separated from water bodies in the form of glass nitrogen. By removing and filtering the SS, BOD, SS, TN and TP can be effectively and efficiently removed, and the device is compact and requires little site.

1 is a conceptual diagram of a first embodiment of a water treatment apparatus according to the present invention;
2 is a conceptual diagram of a second embodiment of a water treatment device according to the present invention;
3 is a conceptual diagram of a third embodiment of a water treatment apparatus according to the present invention;
4 is a conceptual diagram of a fourth embodiment of a water treatment apparatus according to the present invention;
5 is a conceptual diagram of a fifth embodiment of a water treatment device according to the present invention;
6 is a conceptual diagram of a sixth embodiment of a water treatment device according to the present invention;
7A to 7H are external views of granular biofilm carriers of various embodiments included in water treatment apparatuses according to the present invention.

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

1 is a conceptual diagram of a first embodiment of a water treatment apparatus according to the present invention.

The water treatment apparatus according to the first embodiment of the present invention includes a biofilm contact tank (1) in which a biofilm carrier is filled and is biologically treated by a microorganism that adheres to the biofilm carrier, and is filled in the biofilm contact tank (1). The biofilm carrier is composed of a scrubbed biofilm carrier 5 formed by overlapping fibers. This scrubbed biofilm carrier 5 has a large specific surface area and high porosity, which is advantageous for the growth of microorganisms. Therefore, in the biofilm contact tank 1, a large amount of microorganisms are adhered and multiplied for the removal of BOD or the denitrification of nitrogen oxides, and the reaction solution can be smoothly mixed up to the inside of the carrier.

The scrubbed biofilm carrier with the fibers filled in the biofilm contact tank (1) is selected from polyethylene, polypropylene, and polyurethane materials with excellent biocompatibility and physical properties, and has a diameter of 0.1 mm to 1.2 mm. Form a filament in the range, and constitute it by sparse overlap so that the porosity is within the range of 80% to 98%, or form a polyvinylidene chloride material with a filament in the range of 0.1mm to 1.2mm in diameter, This can be configured by superimposing so that the porosity is in the range of 80%-98%. In the process of forming filaments by spinning or the like, the polyvinylidene chloride may be mixed with polyvinyl chloride so that the polyvinyl chloride within the range of 30% to 70% by weight is mixed with the filament.

The scrubber biofilm carrier is superficially overlapping filaments in the range of 0.1 to 1.2 mm in diameter to form a scrubber so that the porosity is in the range of 80 to 90% and the stacking height is 10 mm to 100 mm or more. The contact areas where the filaments touch each other are fixed by bonding them with an adhesive such as latex bond so that the filaments are not pressed by self-weight and maintain the scrubber shape and volume, and the filaments are not scattered individually. Here, the filaments are preferably bent in a circular or spiral shape so that the porosity is large and sparsely stacked in the lamination process.

In addition, the scrubbed biofilm carrier is formed by fusing molten synthetic resin at a high temperature to form filaments, and when the filaments are laminated in a state in which the surface is almost melted, the contact areas of the filaments are fused to each other, and then the filaments are cooled, and then the contact areas of the filaments are cooled. Are adhesively fixed to each other to maintain the scrubber shape and volume. Here, the filament may be spun in a spiral or the like shape so that the porosity is large and coarse. Alternatively, the filament may be laminated by spinning the filaments on a forming mold having a plurality of protrusions.

In addition, the scrubbed biofilm carrier may be constructed by weaving filaments like nets, laminating woven filaments and connecting contact portions with other filaments or fixing them with an adhesive.

Thus, in the scrubbed biofilm carrier, filaments are not too fine to maintain the scrubber shape and porosity, and the elasticity is within the range of 0.1 to 1.2 mm in diameter not too large so that the specific surface area per unit weight can be maintained. Large synthetic resin materials are preferred.

As described above, the scrubber biofilm carrier according to the present invention forms a scrubber with overlapping filaments within a range of 0.1 to 1.2 mm in diameter, and the volume occupied by the filament per unit volume of the scrubber is in the range of 2 to 20%, and thus the porosity is 80 to 98. Scrubbers shaped to be in the% range.

The scrubber biofilm carrier 5 included in the water treatment apparatus according to the present invention has an uneven portion such as protrusions or grooves on the fiber so as to increase the specific surface area to increase the surface area where microorganisms can attach and grow per unit volume or unit weight ( The back can be formed. Such irregularities (not shown) may be used to make irregular protrusions on the surface of the fiber by spraying an adhesive such as latex material having high biocompatibility, erosion resistance, and adhesiveness or a synthetic resin in a molten state. Can be. In addition, in the process of extruding and spinning molten synthetic resin, pulsation is applied to the extrusion pressure so that the fibers form ring-shaped irregularities, or grooves or protrusions are formed in the spinning nozzle to form long protrusions or grooves in the fibers. It can be radiated as much as possible to create the uneven portion.

In the case of the purpose of the denitrification reaction, the denitrification efficiency can be improved by installing an external carbon source injection device 11 for injecting an external carbon source such as methanol or organic acid into the biofilm contact tank. That is, the denitrification reaction in which the nitrate nitrogen is reduced to glass nitrogen is performed in the aerobic condition in which the oxygen is not supplied to the biofilm contact tank 1, and the organic matter is consumed in the denitrification process so that the BOD can be removed. When the amount of organic matter required for the denitrification is insufficient, an external carbon source injection device 11 may be installed, thereby supplying an external carbon source such as methanol, organic acid, sludge desorption solution, or the like.

In addition, the biofilm contact tank is provided with a detachment device 12 for detaching the biofilm excessively attached to the biofilm carrier, the detachment device 12 is to eject the fluid for the film removal, for example, to eject the water flow It may be composed of a pump and a nozzle, a blower and an air diffuser that eject air, or may be configured to eject a mixed water stream in which water and air are mixed. Since the membrane removal device 12 operates intermittently only when the microorganisms are excessively attached, it is preferable to inject the external carbon source through the fluid supply pipe of the membrane removal device 12 when the membrane is not normally removed. It can be quickly and evenly dispersed in the contact bath to induce rapid denitrification. If film removal is necessary, the supply of external carbon sources can be stopped and used for the transport of film removal fluids, thus saving the cost of facilities. That is, the external carbon source and the film removal fluid may be selectively supplied to the biofilm contact tank by a valve operation or an ON-OFF operation of the device.

The biofilm contact tank of the water treatment device of this embodiment, which is filled with a biofilm carrier, can be usefully applied to denitrification under anoxic conditions, and aeration device (not shown) for supplying oxygen to provide a high concentration of organic matter under aerobic conditions is provided. Nitrogenation may be effected by decomposing or oxidizing organic nitrogen and ammonia nitrogen to nitrate nitrogen.

2 is a conceptual diagram of a second embodiment of a water treatment apparatus according to the present invention.

FIG. 2 is provided with a second reactor 2 at a later stage of the biofilm contacting tank 1 according to FIG. 1 so that inflow water is sequentially processed through the biofilm contacting tank 1 and the second reactor 2. Water treatment device.

The second reactor 2 may be provided with an aeration device 13 for supplying air, and may supply air continuously or intermittently as necessary.

The biofilm contact tank 1 is filled with a scrubbed biofilm carrier 5, and the second reaction tank 2 is filled with a granular biofilm carrier 6 capable of performing adhesion proliferation of biofilm and filtration of solids. The granular biofilm carrier 6 is a granular synthetic resin molding, granular foaming resin, granular activated carbon, granular ceramic, granular molding made of ceramic powder and synthetic resin mixture, granular molding coated ceramic with synthetic resin, mixture of synthetic resin and animal and plant material Granular molding consisting of, can be composed of a material and form such as microsagglomerate microspheres formed by agglomeration.

An internal circulation device 14 may be installed to allow a water body subjected to nitrification reaction in the second reaction tank 2 to flow back into the biofilm contact tank 1.

The biofilm contacting tank 1 is provided with a film removing device 12 for detaching the biofilm to increase adhesion, and the internal circulation device 14 is connected to communicate with the film removing device 12 to supply the internal circulation water to the second reactor. It can send to the biofilm contact tank 1 from (2). In addition, an external carbon source injector 11 capable of injecting an external carbon source is installed in communication with the membrane removal device 12 as needed, so that the external carbon source can be operated by a valve operation or an on-off operation of the device. The internal circulating water and the film removal fluid may be selectively supplied to the biofilm contact tank. Of course, the communication of such a device is for the efficiency of the device, and the installation separately does not depart from the scope of the present invention and makes it clear.

Since the operation of the membrane removal device 12 intermittently operates only when the microorganisms are excessively attached, the internal circulation water and the reverse flow introduced from the second reaction tank 2 through the fluid supply pipe of the membrane removal device are not normally removed. By injecting the external carbon source supplied from the carbon source injection device 11, the internal circulating water and the external carbon source can be evenly dispersed in the biofilm contact tank 1 to induce a rapid denitrification reaction. If film removal is necessary, the supply of external carbon source can be stopped and used for transporting fluid such as water stream or film for film removal. In addition, the internal circulating water may be used as a film flow for film removal.

3 is a conceptual diagram of a second embodiment of a water treatment apparatus according to the present invention.

The water treatment apparatus according to this embodiment includes a biofilm contact tank (1) in which a biofilm carrier is filled and biologically treated by a microorganism that adheres to the biofilm carrier, and the biofilm carrier filled in the biofilm contact tank (1) is a fiber. It consists of the scrubber biofilm carrier 5 comprised by overlapping. This scrubber biofilm carrier 5 is as described in FIG. An upper side of the scrubbed biofilm carrier 5 is filled with a granular biofilm carrier 6 capable of performing adhesion proliferation of biofilm and filtration of solids.

The granular biofilm carrier (6) is a granular synthetic resin molding, granular foaming resin, granular activated carbon, granular ceramic, granular molding composed of ceramic and synthetic resin mixture, granular molding coated ceramic with synthetic resin, mixture of synthetic resin and animal and plant material It may be composed of a material and a shape of a granular molded product, a micro sand ball formed by agglomeration into a spherical shape, and when selected from the granular biofilm carrier 6 and filled in the biofilm contact tank, by the granular biofilm carrier 6 Along with the biological reactions such as nitrification and removal of residual BOD, the filter function simultaneously with the physical filtration of the SS is also parallel, thus eliminating the subsequent process for removing the SS.

For aerobic reaction, aeration device 13 for supplying dissolved oxygen to the bottom of the granular biofilm carrier 6 layer or the bottom of the scrubbed biofilm carrier 5 layer may be installed to supply air continuously or intermittently as necessary. Can be. If the detachment of the biofilm overly proliferating is necessary, a desorption device 12 is installed at the bottom of the scrubbed biofilm carrier 5 to apply a shear force to the surface of the biofilm carrier to detach the microorganisms that excessively proliferate. The aeration device 13 and the film removal device 12 may be used for film removal and aeration respectively.

In order to increase the nitrogen removal efficiency, it is preferable to install an internal circulation device 14 which allows the water body to be circulated from the granular biofilm carrier 6 layer to a part of the scrubbed biofilm carrier 5 layer. If 14) is communicated with the membrane removal device 12, the efficiency of the device can be improved.

When the concentration of total kjeldahl Nitrogen (TKN) of the influent is high, nitrification is performed by an aerobic reaction in the granular biofilm carrier 6 layer of the upper layer by the internal circulation device 14, and countercurrent flow by the internal circulation device 14. The introduced nitrate nitrogen is denitrified in the scrubbed biofilm carrier (5) layer.

The granular biofilm carriers 6 and the granular biofilm carriers in another embodiment according to the present invention filled in the upper layer of the scrubbed biofilm carrier 5 filled in the biofilm contact tank 1 have a particle diameter within a range of 2.0 to 35 mm. It is granular material formed by combining materials so that the apparent specific gravity in the dry state is within the range of 0.85 ~ 2.75 or granular materials selected from natural materials.

First, the granular biofilm carrier 6 has a specific gravity and a particle diameter of 1.03∼2.75, 2.0∼35mm, among various ceramic materials such as sand, gravel, anthracite, zeolite, pumice, volcanic, and glass, respectively. What is within the range can be selected and configured or molded.

In addition, the granular biofilm carrier 6 has sand, gravel, anthracite, zeolite, pumice, glass, etc. as a nucleus, and a synthetic resin is coated on the surface thereof, and the specific gravity in the particle size and the dry state is 2.0 to 35 mm, respectively. It can be constructed by coating synthetic resin on granular ceramic so that it is in the range of 0.95 to 2.15.

In addition, the granular biofilm carrier 6 may be formed to have a synthetic resin material within a diameter range of 2.0 to 35 mm, but have a specific gravity and biocompatibility, such as stone powder, anthracite powder, zeolite powder, clay, coal ash, talc, and glass fiber. By mixing the powdery ceramic or powdered activated carbon so that the apparent specific gravity in the dry state is in the range of 0.95 to 2.15, it is possible to form a granule having a controlled specific gravity and increased biocompatibility.

In addition, the granular biofilm carrier 6 is formed by forming a mixture of animal and animal materials such as synthetic resin, animal and vegetable fibers, grass stems, sawdust, animal bones, shells, etc. The apparent specific gravity in the range of 2.0 to 35mm and 0.85 to 1.8, respectively, can form a granular biofilm carrier with a small specific gravity and excellent biocompatibility.

In addition, the synthetic resin material mixed with the ceramic powder and the powdered activated carbon and animal and vegetable materials may be polyethylene, polypropylene, or ABS (Acrolonitile Butadiene Styrene), polyurethane, polychlorinate having a low specific gravity, depending on the specific gravity of the granular body. One or more of vinyl, polyvinylidene chloride, and poly acetal (POM) may be selected and configured.

As described above, the granular biofilm carrier according to the present invention may be configured by selecting from a suitable material or molding or mixing a mixture according to the required specific gravity, biocompatibility, surface roughness, and the form of the reaction.

The filling position of the granular biofilm carrier 6 is not limited to the upper side of the scrubbed biofilm carrier 5, but is lower, left, right, front, left, and right of the scrubbed biofilm carrier 5 depending on the flow direction and the purpose of the reaction solution. At least one side of the side may be included in the scope of the present invention.

4 is a conceptual diagram of a fourth embodiment of a water treatment apparatus according to the present invention.

The water treatment apparatus according to this embodiment includes a biofilm contact tank (1) in which a biofilm carrier is filled and biologically treated by microorganisms that adhere to and propagate to the biofilm carrier, and the biofilm carrier filled in the biofilm contact tank (1) is granular. It is made of a biofilm carrier (6).

When detachment of the biofilm overly proliferating is necessary, a detachment apparatus 12 may be installed below the granular biofilm carrier 6 to exfoliate microorganisms that excessively attach and proliferate by applying a shear force to the surface of the biofilm carrier. In addition, an external carbon source injector 11 capable of injecting an external carbon source is installed in communication with the membrane removal device 12 as needed, so that the external carbon source can be operated by a valve operation or an on-off operation of the device. In addition, the film removal fluid may be selectively supplied to the biofilm contact tank.

The granular biofilm carriers 6 filled in the biofilm contacting tank 1 are screened or molded so that the apparent specific gravity in the dry state is within the range of 2.0 to 35 mm, and is within the range of 0.85 to 2.75, as described in the third embodiment. It is the same as the granular biofilm carriers of each example.

Also in this embodiment, as in the third embodiment, the pores communicate with each other on at least one of the upper side, the lower side, and the front, rear, left and right sides of the granular biofilm carrier 6 layer according to the flow direction and the purpose of the treatment. It is possible to fill the bulk biofilm carrier (not shown) selected from the porous foamed resin, the woven or non-woven fabric with the ciliary layer formed on at least one surface, the rope is densely projected, which is also included in the scope of the present invention. In this case, an internal circulation device may be installed to circulate water to the bulk biofilm carrier layer in the granular biofilm carrier 6 layer to remove nitrogen.

5 is a conceptual diagram of a fifth embodiment of a water treatment apparatus according to the present invention.

In this embodiment, the first reaction tank 3 is provided in the previous stage of the biofilm contact tank 1 filled with the granular biofilm carrier 6, which is the water treatment apparatus described with reference to FIG. And the biofilm contact tank 1 are sequentially processed, and the first reactor 3 is a porous foamed resin in which pores communicate with each other, a woven or nonwoven fabric having a ciliary layer formed on at least one surface thereof, a rope in which fibers protrude, Or a bulk biofilm carrier 7 filled with at least one of the corresponding forms. The first reaction tank 3 is filled with various types of biofilm carriers so as to increase the adhesion of microorganisms, and mainly, BOD decomposition and denitrification reactions are carried out, so it is preferable to fill the bulk biofilm carriers. ) Is installed in the previous step to minimize the SS outflow by filling the biofilm contact tank (1), which is a subsequent step, with the granular biofilm carrier (6) as in the third embodiment, which can also perform a filtration function.

When the concentration of TKN in the influent is high to remove the TN by nitrification and denitrification, the internal circulation device 14 to allow the water reacted in the biofilm contact tank (1) to flow back into the first reaction tank (3) Can be installed. The internal circulation device 14 constitutes a water treatment device such that the reaction liquid flows back from the biofilm contact tank 1 into the first reaction tank 3 or flows outflow of the water treatment device into the first reaction tank. can do.

The first reaction tank 3 is provided with a desorption apparatus 12 for detaching the external carbon source injector 11 and the biofilm to increase adhesion, and at least one of the external carbon source injector 11 and the internal circulation device 14. Any one may be connected to communicate with the membrane removal device 12.

The first reaction tank 3 is subjected to a denitrification reaction in which the nitrate nitrogen flowed back from the biofilm contact tank 1 is reduced to free nitrogen under aerobic conditions in which oxygen is not supplied, and organic matter is consumed in the denitrification process. BOD can be removed. When the amount of organic matter required for the denitrification reaction is insufficient, an external carbon source such as methanol, organic acid, sludge desorption liquid, etc. may be supplied through an external carbon source injection device 11 or the like.

The biofilm contact tank 1 in which the aerobic reaction takes place is abandoned to supply dissolved oxygen because a biological reaction is performed to oxidize organic nitrogen and ammonia nitrogen to nitrate nitrogen and to aerobic decompose residual organic materials under aerobic conditions in which oxygen is supplied. The apparatus 13 was installed, and the configuration and function of the external carbon source injection apparatus 11, the membrane removal apparatus 12 and the internal circulation apparatus 14 are the same as in the water treatment apparatus of the embodiment according to FIG.

6 is a conceptual diagram of a sixth embodiment of a water treatment device according to the present invention.

This embodiment is installed in the membrane separation device 10 is a membrane separation at the rear end of the water treatment apparatus described in the embodiment of Figure 1 of the present invention so that the influent water is treated sequentially through the water treatment device and the membrane separation device will be. That is, after passing through a water treatment device in which biological treatment is performed by microorganisms attached to the scrubbed biofilm carrier 5 filled in the biofilm contact tank 1, the treated water is a membrane separation tank equipped with a membrane separation device 10 ( Enter 4).

In addition, it is also possible to sequentially pass through three treatment tanks arranged in series by installing the membrane separation tank 4 and the membrane separation apparatus 10 at the rear end of the water treatment apparatus described in the embodiment according to FIGS. Do.

The filtration membrane (membrane) constituting the membrane separation apparatus 10 may be a micro filtration membrane (MF), an ultra filtration (UF) membrane, or a nano filtration (NF: Nano) according to the size of the target material to be removed. Filtration membrane, Reverse Filtration (RO) membrane or Ion Exchange (IE) membrane can be selected.

The membrane separation device 10 may be modular, or may be constituted by an immersion type membrane separation device installed by being submerged in the membrane separation tank 4.

The filtration membrane pump 15 is connected to the membrane separation device 10 and its suction port to provide suction force for membrane separation, and the filtration membrane pump 15 constitutes the airtight structure of the membrane separation tank 4 and is pressurized. This is the same concept.

The aeration device 13 is installed in the membrane separation tank 4 in which the immersion type membrane separation device 10 is configured. This is mainly to prevent fouling by washing the surface of the filtration membrane, and at the same time, the membrane separation. It can be used for the supply of dissolved oxygen to denitrate and remove nitrification reactions that proliferate aerobic microorganisms in the bath.

The concentrated filtrate separated by the membrane separator includes various contaminants such as solids and hardly decomposable organics. The concentrated filtrate may be introduced into the reaction tank of the previous stage such as the biofilm contact tank 1 through the concentrated filtrate extraction device 16 so that organic matter decomposition and denitrification reaction may be performed in the biofilm contact tank.

In addition, by connecting the concentrated filtrate extraction device 16 to the external carbon source injector 11 and the desulfurization apparatus 12 installed in the biofilm contacting tank of the water treatment device, the concentrated filtrate is directly contained in the biofilm contacting tank so as to be contained in the concentrated filtrate. Denitrification of nitrogen oxides and biological degradation of organic materials can be achieved. The concentrated filtrate extraction device may be composed mainly of a pump in the suction type membrane separation device, and may be composed of a simple connection pipe in the pressure type membrane separation device, which is treated as the same concept here.

6 shows a water treatment apparatus provided with a membrane separation apparatus at the rear end of the water treatment apparatus of the first embodiment according to the present invention, but is not limited thereto, and membrane separation is also performed at the rear end of the water treatment apparatus of another embodiment as in this embodiment. The device can be installed and flowed back to the previous stage through the concentrated filtrate extraction unit, which is also within the scope of the present invention.

7A to 7H relate to an embodiment of the granular biofilm carrier included in the water treatment device according to the present invention.

The granular biofilm carrier 6 needs to be careful because the biofilm that collides with the flow during the film removal and is attached to the surface may be excessively washed, and it is preferable to increase the specific surface area to increase the surface area where the biofilm may grow.

Therefore, in the present invention, as shown in FIG. 7A, one or more through holes 17 are formed in the granular biofilm carrier 6, or the trough 18 is formed to form a container as shown in FIG. 7B to increase the specific surface area, and The biofilm which proliferated in the inside of the gutter was maintained even upon detachment.

In addition, as shown in FIGS. 7C and 7D, one or more filed grooves 19 or dimples 20 are formed in the granular biofilm carrier 6 so that the biofilms adhered to the filed grooves and dimples are maintained during the film removal process and the specific surface area is increased. . In FIG. 7E, the through-hole is formed in the granular biofilm carrier, but the specific surface area and the porosity are increased by forming the honeycomb.

7A to 7E illustrate the granular biofilm carrier in a spherical shape, but the present invention is not limited thereto. As shown in FIG. 7F to FIG.

The present invention can further treat the treated sewage and the like reused as river maintenance water, industrial water, irrigation water, etc., and can be used for high-purity water treatment of drinking water, and can treat effluent water generated from non-point source with high efficiency and biological It can also be used simply as a physical filtration device that does not involve a reaction.

1: biofilm contact tank 2: second reactor
3: first reactor 4: membrane separation tank
5: scrubber biofilm carrier 6: granular biofilm carrier
7: bulk biofilm carrier 10: membrane separation device
11: external carbon source injection device 12: membrane removal device
13: aeration device 14: internal circulation device
15: filtration membrane pump 16: concentrated filtrate extraction device
17 through hole 18 gutter
19: string groove 20: dimple
21: honeycomb through hole

Claims (17)

The first reactor 3 filled with a bulk biofilm carrier 7 selected from porous foamed resin in which pores communicate with each other, a woven or nonwoven fabric having a ciliary layer formed on at least one surface thereof, and a rope from which fibers protrude, and a granular biofilm carrier 6 ) Is filled with a biofilm contact tank (1) is a biological treatment,
Inflow water is introduced into the first reaction tank (3) and the biofilm contact tank (1) to be sequentially processed,
In the first reaction tank (3), a bulk biofilm carrier (7) and a biofilm deposition apparatus for detaching the biofilm attached to the granular biofilm carrier (6) in the biofilm contact tank (1) are provided, respectively,
It is provided with an internal circulation device 14 for introducing a portion of the water body reacted in the biofilm contact tank (1) backflow into the first reaction tank (3),
The granular biofilm carrier (6) filled in the biofilm contact tank (1) is formed or screened so that the apparent specific gravity in the particle size and the dry state is in the range of 2.0 to 35 mm and 0.85 to 2.75, respectively.
The water treatment apparatus according to claim 1, wherein the granular biofilm carrier (6) is made of a ceramic having a particle size and apparent specific gravity in a dry state of 2.0 to 35 mm and 1.03 to 2.15, respectively.
The water treatment apparatus according to claim 1, wherein the granular biofilm carrier (6) has a specific gravity in the particle size and in the dry state in the range of 2.0 to 35 mm and 0.95 to 2.15, respectively, and is made of a mixture of synthetic resin and ceramic powder.
The water treatment apparatus according to claim 1, wherein the granular biofilm carrier 6 has an apparent specific gravity in the particle size and the dry state in the range of 2.0 to 35 mm and 0.85 to 1.8, respectively, and is made of a mixture of synthetic resin and animal and plant material. .
The water treatment apparatus according to claim 1, wherein the internal circulation device (14) is connected to communicate with the membrane removal device (12).
The water treatment apparatus according to any one of claims 1 to 4, further comprising a membrane separation device (10), wherein the membrane separation device (10) is installed at a later stage of the biofilm contact tank (1). , The effluent of the biofilm contact tank (1) is treated through the membrane separation device (10).
According to claim 6, wherein the membrane separation device 10 is provided with a concentrated filtrate extraction device 16 for withdrawing the concentrated filtrate after membrane separation, the concentrated filtrate withdrawal device 16 is the biofilm contact tank (1) Water treatment apparatus, characterized in that connected to communicate with the film removal apparatus (12) installed in.
The granular biofilm carrier 6 has a through hole 17, a trough 18, a row groove 19, a dimple 20, and a honeycomb through hole 21 according to any one of claims 1 to 4. At least one or more of the water treatment apparatus, characterized in that the molded. delete delete delete delete delete delete delete delete delete

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