KR20050068544A - Apparatus and method for treat biologic denitration of wastewater and sewage comprising nitrate nitrogen - Google Patents

Abstract

The present invention relates to an apparatus and method for biological denitrification of waste and sewage, and more particularly, to an apparatus and method for biological denitrification of waste and sewage capable of completely denitrifying waste and sewage containing a large amount of nitrate nitrogen. will be. The present invention provides an alkalinity storage tank containing sodium hydrogen carbonate (NaHCO ₃ ); A mixing distribution tank for mixing sodium hydrogen carbonate (NaHCO ₃ ) contained in the alkali storage tank and raw water contained in the raw water storage tank and distributing it to the denitrification reaction tank; Raw water (raw water mixed with alkalinity) of the mixing distributor is introduced, and a biofilm (BIO-FILTER) composed of water-insoluble granular carriers, granular activated carbon, and particle sulfur, to which autotrophic denitrifying microorganisms are attached, is filled therein. It provides a biological denitrification treatment apparatus for waste and sewage, and a denitrification treatment method using the same, including a; desulfurization reaction tank is installed at the bottom of the filter medium to prevent the outflow of the biofilm. Accordingly, the present invention can maximize the denitrification efficiency and can remove and remove excess organics and suspended solids, and prevent the formation of aggregated precipitates, thereby preventing the blockage of the inside of the denitrification reactor and the pipe.

Description

Apparatus and method for treat biologic denitration of wastewater and sewage comprising nitrate nitrogen}

The present invention relates to a wastewater and sewage biological denitrification treatment apparatus and method for biologically removing a large amount of nitrate nitrogen present in the waste and sewage, and more specifically, waste and sewage (nitrification) containing a large amount of nitrate oxygen. Reacted raw water) into a denitrification reactor filled with water-insoluble granular carriers, granular activated carbon and granular sulfur attached with autotrophic denitrifying microorganisms to maximize the efficiency of denitrification, and at the same time, surplus organics and suspended solids. (SS) is adsorbed and removed, the alkalinity is injected from the outside, but using sodium hydrogen carbonate (NaHCO ₃ ) to prevent the blockage of the inside of the denitrification reactor and the pipes, biological denitrification treatment apparatus of waste and sewage and its It is about a method.

In general, physical and biological methods are used in the treatment of contaminants, organic substances, nitrogen and phosphorus in waste and sewage. In particular, nitrogen in waste and sewage is treated in a waste and sewage treatment system by installing a reaction tank for nitrification and a reaction tank for denitrification and nitrifying organic nitrogen or ammonia nitrogen by biological method and then reducing it to nitrogen gas. Doing. Such biological nitrification / denitrification is usefully applied to the treatment of waste and sewage containing high concentrations of organic substances such as leachate and livestock wastewater and ammonia nitrogen. This is more efficient when the C / N (organic / nitrogen) value of the influent wastewater and sewage is large. In this nitrification / denitrification process, in order to use organic matter in raw water as an electron donor, an apparatus operated in order of denitrification / postoxidation using effluent return or internal transport in consideration of the C / N ratio in waste water is mainly used.

1 is a schematic diagram illustrating a method for treating biological denitrification of waste and sewage according to a conventional general technique.

In general, waste and sewage treatment includes flow control tanks for water quality equalization of waste and sewage, and screens, sand, clay, and the like, which perform functions of removing contaminants to prevent pump malfunction or clogging, and mixing them into the treatment facility. Physical treatment process using a device equipped with a sedimentation basin for depositing sand or clay and an initial sedimentation basin to remove solids by gravity sedimentation to prevent sedimentation or pump wear in the reactor. A biological treatment process for treating nitrogen and phosphorus is performed, wherein the inflow source 10 for biological treatment is anaerobic 20, denitrification 30, nitrification 40, and final settler ( 50). Phosphorus of activated sludge is released in the anaerobic tank 20, denitrification by heterotrophic denitrification microorganisms is carried out in the denitrification reactor 30, and nitrification is carried out in the nitrification reactor 40, and organic matter and phosphorus are simultaneously removed. At this time, a certain ratio of the mixed liquid in the nitrification reaction tank 40 in which nitrification proceeds is returned to the denitrification reaction tank 30, and the nitrate nitrogen is reduced to nitrogen by the heterotrophic denitrification microorganisms inhabited therein and is released into the atmosphere.

In this case, in order to smooth the denitrification reaction, that is, to increase the nitrogen removal efficiency, an appropriate heterotrophic denitrification microorganism concentration should be maintained. The heterotrophic denitrification microbial concentration is determined by the internal transport 90. That is, the amount of activated sludge for propagation of heterotrophic microorganisms should be internally conveyed as much as possible from the nitrification reactor 40 to the denitrification reactor 30. Accordingly, the biological denitrification treatment using heterotrophic denitrification microorganism as shown in FIG. 1 removes nitrogen through a complicated process such as internal transfer 90, so that the required site, power ratio of internal transfer pump, limitation of removal efficiency, and reaction tank ( 30) (40) It was accompanied with various problems such as volume increase. In addition, in order to improve the removal efficiency, when the organic carbon source (organic material) of the inflow source is insufficient, there is a problem in that the organic carbon source such as acetate, methanol, etc. must be artificially injected from the outside (11).

At this time, when the organic carbon source is injected in excess (11) and the organic carbon source remains in the reaction tank (30) (40), it may cause an inhibitory effect on the nitrification / denitrification process, rather, may lower the removal efficiency, the residual organic matter in the effluent Post-treatment facilities may be needed for removal and treatment of excess sludge.

Accordingly, in recent years, due to the limitation of the denitrification treatment using heterotrophic microorganisms as described above, the interest in the denitrification treatment process using autotrophic microorganisms has increased.

Republic of Korea Patent No. 0304068, Patent Publication No. 10-2002-0001495, Patent Publication No. 10-2003-0008416 and the like has been proposed a denitration treatment apparatus and method using sulfur that does not require an organic carbon source (organic). The sulfur-using denitrification treatment is to charge the autotrophic denitrification reactor with the sulfur of the particle attached with the autotrophic denitrification microorganism to perform denitrification reaction (reduction reaction). Specifically, sulfur ionized by the autotrophic denitrification microorganism is Oxygen is taken away from the nitrate nitrogen (reduction) itself (sulfur) to be sulfate ion (SO ₄ ^2- ) and nitrate nitrogen (NO ₃ -N) is reduced to nitrogen gas (N ₂ ) to be released.

Unlike the heterotrophic denitrification, the denitrification using autotrophic sulfur is independent due to the denitrification of nitrate nitrogen (NO ₃ -N) and the formation of hydrogen ions (H ⁺ ) in addition to sulfate ion (SO ₄ ^2- ) as a final product. The pH in the nutrient denitrification reactor is lowered. At this time, the low pH condition in the denitrification reactor has a direct effect on the growth of microorganisms, which leads to deterioration of the treatment efficiency, so that the alkalinity should be sufficiently supplied for the smooth execution of sulfur using denitrification. To this end, conventionally, in forming the particle sulfur, for the supply of alkalinity, calcium carbonate (CaCO ₃ ) was mixed with liquid sulfur and molded into a granular particle having a predetermined diameter. In other words, in supplying the alkalinity, the particles were mixed with the sulfur of sulfur and supplied internally in a denitrification reactor by a self-filling method, and the alkalinity was calcium carbonate (CaCO ₃ ).

However, the internal filling method of granular sulfur prepared by mixing CaCO ₃ and sulfur can supply sufficient alkalinity to the denitrification tank by itself, but as time passes, insoluble matter calcium sulfate (CaSO ₄ ) The calcium sulfate (CaSO ₄ ) is agglomerated and precipitated in the reaction vessel and the pipes to cause clogging of the reaction vessel and the pipes.

In addition, in the denitrification reactor, the charged sulfur and the influent water (waste and sewage containing nitrated nitrate nitrogen) are freely contacted, that is, between the sulfur and the particle sulfur so that the inflow water sufficiently passes between the particle sulfur. As many voids as possible should be present between the particles, as described above, as the reaction time elapses, the particle diameter of the particle sulfur becomes smaller and the pore becomes smaller, thereby causing the particle sulfur to be concentrated. This, in turn, reduces the contact rate between the particle sulfur and the influent water, thereby lowering the denitrification efficiency and causing the problem of clogging the reactor by the smaller particle sulfur. At this time, in order to prevent the reaction tank from clogging due to the smaller particle sulfur, the backwash pump is installed to perform backwashing, but due to the high number of times, the power cost is increased and the contact of the inflow water and the particle sulfur is caused by the backwashing of a large number of times. There was also a problem that this was poor and denitrification efficiency was lowered.

In addition, the inflow water introduced into the denitrification reactor has surplus organic matter and suspended solids (SS). The conventional denitrification reactor has a biofilm (BIO-FILTER) for denitrification, that is, an autotrophic microorganism is attached. Only particle sulfur is filled and there is no separate means for removing organic matter or suspended solids (SS), and thus, the effluent (treated water) has a problem in that organic and suspended solids (SS) are leaked in a large amount.

The present invention has been invented to solve the above problems, a biofilm consisting of granular carriers, granular activated carbon and granular sulfur to which waste and sewage containing a large amount of nitrates are attached to autotrophic denitrifying microorganisms (BIO-FILTER ) By maximizing the efficiency of denitrification, absorbing and removing excess organic matter and suspended solids (SS) and reducing power costs, and supplying alkalinity from outside. It is an object of the present invention to provide a wastewater and sewage biological denitrification treatment apparatus and a method thereof, by using sodium hydrogen carbonate (NaHCO ₃ ), which can prevent clogging of the inside of the denitrification reactor and piping.

In order to achieve the above object, the present invention provides a biological denitrification apparatus for waste and sewage having an autotrophic denitrifying microorganism and sulfur-filled denitrification reaction tank so that waste and sewage containing a large amount of nitrate nitrogen is introduced and denitrification proceeds. To

An alkalinity storage tank containing sodium hydrogen carbonate (NaHCO ₃ ); A mixing distribution tank for mixing sodium hydrogen carbonate (NaHCO ₃ ) contained in the alkali storage tank and raw water (waste and sewage containing a large amount of nitrate nitrogen) contained in the raw water storage tank and distributing them to the denitrification reaction tank; Water-insoluble granular carrier having raw water (raw water containing large amounts of nitrate nitrogen and alkalinity (NaHCO ₃ ) mixed) flowing into the mixing distribution tank and having an autotrophic denitrifying microorganism attached thereto; Biological denitrification treatment apparatus for waste and sewage, comprising: a desulfurization reactor filled with a bio-film (BIO-FILTER) made of granular activated carbon and granular sulfur, and having a filter medium installed at a lower end thereof to prevent the biofilm from flowing out. to provide.

In addition, the present invention provides a method for biological denitrification of waste and sewage, in which waste and sewage containing a large amount of nitrate nitrogen is denitrified using autotrophic denitrifying microorganisms and sulfur.

A biofilm (BIO-FILTER) consisting of water-insoluble granular carrier, granular activated carbon, and granular sulfur, to which an autotrophic denitrifying microorganism is attached, was filled in a denitrification reactor having a filter medium at the bottom, and then a large amount of nitrate nitrogen was contained. It provides a method for treating biological denitrification of waste and sewage, wherein waste and sewage are introduced into the denitrification reactor and at the same time, alkalinity is supplied to the desulfurization reactor from the outside, using sodium hydrogen carbonate (NaHCO ₃ ). .

Hereinafter, the biological denitrification apparatus and method thereof of the present invention will be described in detail with reference to the accompanying drawings showing a schematic diagram of an exemplary desulfurization apparatus of the present invention.

The biological denitrification apparatus and method of the present invention is to treat waste and sewage containing a large amount of nitrate nitrogen in the overall treatment process of waste and sewage, specifically raw water (denitrification target raw water) which has undergone nitrification. In particular, the device is connected to the front end of the physical pretreatment, such as the flow control tank, the screen, the settling basin and the initial settling basin, the rear end may be associated with a conventional final settling basin.

2 and 3 show an exemplary configuration of a biological denitrification apparatus according to the present invention, Figure 2 shows a downflow device, Figure 3 shows an upflow device.

2 and 3, the denitrification apparatus of the present invention includes at least an alkali storage tank 100, a mixing distribution tank 200, and a denitrification reaction tank 300. It is composed.

The alkalinity storage tank 100 is installed on the outside of the denitrification reaction tank 300 as shown to supply the alkalinity in the denitrification reaction tank 300 from the outside, where sodium hydrogen carbonate (NaHCO ₃ ) is accommodated.

The mixing distributor 200 is a sodium hydrogen carbonate (NaHCO ₃ ) accommodated in the alkalinity storage tank 100 and the raw water (waste and sewage containing a large amount of nitrate nitrogen, accommodated in the raw water storage tank 400, specifically, nitrification reaction Coarse waste and sewage) is mixed into the denitrification reactor 300 to distribute (inject) raw water to be treated, that is, waste and sewage containing a large amount of nitrate nitrogen and raw water mixed with alkalinity (NaHCO ₃ ). The main pipe 510 is connected to the upper portion, and the inflow pipe 520 for introducing the raw water to be treated into the denitrification reactor 300 is connected to the lower portion thereof. At this time, one side of the inlet pipe 520 is connected to the lower portion of the mixing distribution tank 200, the other side is connected to the upper portion of the denitrification reaction tank 300, if the device is a downflow type, if the upflow type It is connected to the lower portion of the denitrification reactor (300).

In addition, the main pipe 510 is connected to the first branch pipe 512 in communication with the alkalinity storage tank 100 and the second branch pipe 514 in communication with the raw water storage tank 400. And, as shown, the first branch pipe 512 and the second branch pipe 514 so that the alkalinity (NaHCO ₃ ) and raw water is forced into the mixing distribution tank 200 according to the position of the mixing distribution tank 200. An alkalinity inflow pump P1 and a raw water inflow pump P2 may be installed. In addition, a pump (not shown) may be installed in the inlet pipe 520 according to the positions of the mixing distribution tank 200 and the denitrification reaction tank 300.

The raw water storage tank 400 contains waste and sewage containing a large amount of nitrate nitrogen, specifically, waste and sewage that have undergone nitrification. Such raw water storage tank 400 is a conventional nitrification tank 40 (see FIG. 1). Can be

Therefore, the raw water (waste and sewage containing a large amount of nitrate nitrogen) of the raw water storage tank 400 and the alkalinity (NaHCO ₃ ) of the alkalinity storage tank 100 are mixed in the process of passing through the main pipe 510 and then the mixing distribution tank. Completely mixed at 200 and then passed through the inlet pipe 520 to the denitrification reactor 300 is denitrified.

The denitrification reactor 300 is filled with a granular carrier 352, granular activated carbon 354 and granular sulfur 356 to which autotrophic denitrifying microorganisms are attached. The granular carrier 352, the granular activated carbon 354 and the particle sulfur 356 are filled with each particle layered by type or are mixed with each other in a non-uniform manner so that the biofilm (BIO-FILTER) in the denitrification reactor 300 is filled. , 350, wherein at least the granular carrier 352 and the particle sulfur 356 are not layered by type and are randomly mixed and filled with each other.

The particles of sulfur 356 as being used as an energy source for the denitrification process, the particles of sulfur (356) used in the present invention is not sulfur particles produced by mixing the CaCO ₃ with the liquid sulfur as in the prior art, it includes a CaCO ₃ Particulate sulfur based on sulfur not present. Preferably, in terms of recycling, the processed by-products generated in the desulfurization process of crude oil is used. Such particle sulfur 356 is not particularly limited, but preferably, one having a diameter of about 5 to 10 mm is used. When the diameter of the particle sulfur 356 is less than 5mm, it is not preferable because it is small quickly, and when it exceeds 10mm, it is not preferable in terms of fluidity and may not exhibit excellent denitrification effect because the total surface area is small compared to the filling amount. In addition, in the present invention, the particle sulfur 356 includes one having an autotrophic denitrifying microorganism attached thereto and one not attached thereto.

The granular activated carbon 354 adsorbs the surplus organic matter and suspended matter (SS) that are suspended in the denitrification reactor 300, and in particular, adsorbs the autotrophic denitrifying microorganisms and keeps them in the reaction tank to perform denitrification. As an example, 8 to 20 mesh palm coal can be used.

The granule carrier 352 is a water-insoluble granule free of flow in the water stream to which autotrophic denitrifying microorganisms can grow, and may be, for example, a granule carrier made of plastic. Here, the plastic includes foamed plastic and waste plastic in which pores are formed. The granular carrier 352 is filled in the denitrification reaction tank 300 mixed with the particle sulfur 356 to form pores so that the raw water to be treated and the particle sulfur 356 are in good contact. That is, as the denitrification reaction time elapses, the diameter of the particle sulfur 356 decreases to decrease the pore size. In this case, the water-insoluble granular carrier 352 forms pores in the denitrification reaction tank 300 and the raw water to be treated. The contact rate of the particle sulfur 356 is increased to maximize the denitrification efficiency. In addition, the granular carrier 352 serves as a carrier to which the smaller particle sulfur 356 can be attached, thereby preventing the denitrification reactor 356 from being blocked by the smaller particle sulfur 356. Such granular carrier 352 is preferably used having a diameter of 5 ~ 10mm. If the diameter is smaller than 5mm, it is not preferable in terms of forming voids. If the diameter is larger than 10mm, a large amount of energy is required for the flow and the flow range is reduced, which may occur in the bottom of the reactor 356, which is not preferable.

In addition, the granular carrier 352 is filled in the denitrification reactor 300 in the state that the autotrophic denitrification microorganism is attached to the surface. On the surface of the autotrophic sulfur denitrification microbes thio Bacillus di NITRY pecan switch (Thiobacillus denifrificans), thio micro Spirra di NITRY pecan switch (Thiomicrospira denifrificans) and the like, which are independently selected culture granular carrier 352 Attached.

The autotrophic denitrifying microorganisms grow and proliferate in the granular carrier 352 and attach to the particle sulfur 356 to participate in the denitrification reaction. That is, in the present invention, the particle sulfur 356 may be filled in a state in which autotrophic denitrification microorganisms are not attached. In this case, the autotrophic denitrification microorganisms attached to the granular carrier 352 are denitrification reactor 300. Grows and attaches to the entry sulfur 352 to participate in the denitrification reaction. In addition, the denitrification reactor 300 is attached to the autotrophic denitrification microorganism in addition to the granular carrier 352 and the particle sulfur 356 so that a large amount of autotrophic denitrification microorganisms can be contained in the denitrification reactor 300. Can be charged.

In addition, the granular carrier 352 is preferably used by mixing waste polyethylene, zeolite, powdered activated carbon in a predetermined ratio to have a diameter of 5 ~ 10mm, a specific gravity of 1 ~ 1.19 range. The granular carrier 352 is good growth of various kinds of microorganisms attached, it is smoothly flows according to the water stream, waste polyethylene is used as the main raw material has the advantage of high economic efficiency. The applicant for the granule carrier having such a feature and a method for producing the same are described in detail in Korean Patent Application No. 10-2003-0019093 (filed March 27, 2003).

The granular carrier 352 to be used in the present invention includes the granular carrier described in Patent Application No. 10-2003-0019093. This will be described in more detail as follows.

The granular carrier 352 is manufactured by extrusion molding a mixture of waste polyethylene or its derivatives, zeolite and powdered activated carbon into granules with a diameter of 5 to 10 mm and a specific gravity of 1 to 1.19. As a specific example of the preparation method, 50 to 70% by weight of waste polyethylene (or a derivative thereof), 10 to 31% by weight of zeolite powder, and 5 to 14% by weight of powdered activated carbon are mixed and put into a stirrer at 75 to 80 rpm. 30-60 minutes of stirring and mixing at a rotational speed melt extrusion into a melt extruder, wherein the melt temperature of the mixture is maintained at 200 ~ 250 ℃, the extrusion pressure is to be maintained at 0.2 ~ 0.4 kgf / ㎠. In addition, the extruder is cut into a size of 5 to 10 mm at the same time as the extrusion, and then molded into granules, and when cutting, the carriers are formed by quenching the molded carriers by cutting while spraying water at 10 to 16 ° C. with a water sprayer. Do not reattach.

The granular carrier 352 prepared as described above has a diameter of 5 to 10 mm, a specific gravity of 1 to 1.19, and an apparent specific gravity of 0.45 to 0.60 kg / L, which is good for attaching and growing various kinds of microorganisms as described above. It has the advantage that there is no stagnation of the carrier because it flows smoothly according to the water flow, and waste polyethylene is used as the main raw material and has high economical characteristics. In addition, since it has a large specific surface area suitable for adhesion growth of many microorganisms, high-speed treatment of denitrification is possible, and nutrients, organic matter, and suspended solids (SS) can be adsorbed and removed.

In the denitrification reaction tank 300 according to the present invention, the granular carrier 352, the granular activated carbon 354, and the particle sulfur 356 are filled to form the biofilm 350. The biofilm 350 made of the material has a mixing ratio of 40 to 60 wt% of the granular carrier 352, 5 to 15 wt% of the granular activated carbon 354 and 30 to 50 wt% of the particle sulfur 356. It is preferable to charge so that it consists of. It has good characteristics in the formation of voids, smooth flow of the granular carrier 352, denitrification effect, adsorption removal effect of suspended solids (SS) in this range.

In addition, the filter body 380 is installed at the lower end of the denitrification reaction tank 300 so that the biofilm 350 made of the granules does not flow out of the reaction tank 300 through the outlet pipe 540. The filter body 380 is formed with holes smaller than their diameters so that the granular carrier 352, the granular activated carbon 354 and the particle sulfur 356 do not escape, and the disk-shaped net corresponding to the shape of the reaction tank 300. Or hexahedron and cylindrical cylinders. In addition, the filter body 380 is firmly fixed to the lower end of the reaction tank 300 so as not to shake the flow of the water flow.

Therefore, in the denitrification reactor 300, the surplus organic matter and suspended solids (SS) are adsorbed and removed by the granular support 352 and the granular activated carbon 354, and the particle sulfur and the raw water are formed by the pores formed by the granular support 352. The high contact rate of the denitrification reaction proceeds smoothly and at the same time the growth and growth of microorganisms in the granular carrier 352 is improved, the fast denitrification reaction proceeds. At this time, in the denitrification reactor 300, total nitrogen (TN), nitrate nitrogen (NO ₃ -N) and the like present in the raw water to be treated are reduced to nitrogen gas (N ₂ ) and removed. Removal of (NO ₃ -N) can be removed by expressing the following stoichiometry.

Chemistry of Chemical Reactions

^{_{NO 3 - + 1.1S + 0.76H 2}} O + 0.4CO 2 + 0.08NH 4 +

→ 0.08C ₅ H ₇ NO ₂ + 0.5N ₂ + 1.1SO ₄ ^2- + 1.28H ⁺

At this time, the pH decrease of the reaction tank 300 by the sulfate ion (SO ₄ ^2- ) and hydrogen ion (H ⁺ ) contained in the product of the reaction formula is increased by the alkalinity (NaHCO ₃ ) supplied with raw water from the outside. do.

In addition, the biological denitrification apparatus according to the present invention is a backwash pump (not shown) for backwashing as usual so as to prevent the small particle sulfur 356 accumulated in the lower part of the reactor 300 over time. ) Is installed. However, in the desulfurization treatment apparatus according to the present invention, sufficient pores are formed by the granule carrier 352, and a part of the smaller particle sulfur 356 is attached to the granule carrier 352, so that a backwash pump (not shown) is provided. The number of times of operation) is much more limited than before.

Biological denitrification apparatus according to the present invention includes a downflow and upflow. 2 is a process in which raw water (a raw water mixed with wastewater and sewage having undergone nitrification and alkalinity (NaHCO ₃ ) mixed) received in the mixing distributor 200 flows into the upper portion of the denitrification reactor 300 and is processed downward. Figure 3 shows the upflow type processing apparatus is shown, Figure 3 shows the upflow processing apparatus that is processed in the process of raw water flowing into the lower portion of the denitrification reactor 300 is up.

2, when the denitrification apparatus according to the present invention is a downflow type, the treated water outflow pipe 540 is connected to the lower portion of the denitrification reactor 300 so that the denitrified treated water can be discharged to the outside. In the case of the upflow type, as shown in FIG. 3, the treated water outlet pipe 540 is connected to the upper portion of the denitrification reactor 300.

In this case, when the apparatus according to the present invention is a downflow type in forming the biofilm 350, that is, the granular carrier 352, granular activated carbon 354, and granular sulfur 356 to which the autotrophic denitrifying microorganisms are attached. In filling, as shown in FIG. 2, the granular activated carbon 354 is filled so as to be located under the denitrification reactor 300, and the granular carrier 352 and the grain sulfur 356 are placed on the granular activated carbon 354. It is preferable to fill so that the mixed particles of 위치) are located. This causes the granular activated carbon 354 to be positioned in proximity to the treated water outlet pipe 540 connected to the lower portion of the denitrification reactor 300, so that the organic matter and suspended solids (SS) of the treated water flowing out are granular activated carbon 354. This is to finally remove the adsorption. In the case of the upflow type, in the stacking of the biofilm 350, as shown in FIG. 3, the granular activated carbon 354 is charged to be positioned above the denitrification reactor 300. It is preferable to fill so that the mixed particles of the granular carrier 352 and the particle sulfur 356 are positioned under the granular activated carbon 354.

On the other hand, the biological denitrification treatment method according to the present invention is treated using the denitrification reactor 300 as described above, the alkalinity is supplied from the outside of the denitrification reactor 300 using sodium hydrogen carbonate (NaHCO ₃ ). As,

Biofilm consisting of water-insoluble granular carrier 352, granular activated carbon 354, and granular sulfur 356 attached to the denitrification reactor 300 having the filter medium 380 installed at the bottom thereof. FILTER, 350);

Injecting the raw water undergoing nitrification into the denitrification reactor (300);

And supplying alkalinity to the denitrification reactor 300 from the outside, using sodium hydrogen carbonate (NaHCO ₃ ).

Preferably it is treated using the denitrification apparatus according to the present invention.

Hereinafter, specific embodiments of the present invention will be described.

EXAMPLE

A downflow apparatus as shown in FIG. 2 was tested and the denitrification reactor 300 was filled with a biofilm 350. At this time, the biofilm 350 is made of a ratio of 40% by weight of the granular carrier 352, 10% by weight of granular activated carbon 354, 50% by weight of the particle sulfur (356), the granular carrier 352 is waste polyethylene 70 The mixture was prepared by extrusion molding by mixing 20% by weight of zeolite and 10% by weight of powdered activated carbon, having a diameter distribution of 5 to 10 mm, a specific gravity of 1.09 and an apparent specific gravity of 0.46 kg / L. On the surface of the granule carrier 352, the inventors attached Thiobacillus denifrificans , which was independently incubated.

First, the granular activated carbon 354 was charged to the lower part of the denitrification reactor 300, and then mixed particles of the granular carrier 352 and the particle sulfur 356 to which the autotrophic denitrifying microorganism was attached were stacked. At this time, the particle sulfur (356) was processed as a by-product generated in the desulfurization process of crude oil, was used having an average diameter of 6mm, was filled without Thiobacillus denifrificans attached.

In addition, the raw water was used for the semiconductor wastewater and operated for about 2 months to repeatedly analyze the contents of total nitrogen (TN) and nitrate nitrogen (NO ₃ -N) for raw water and treated water [Table 1] and [ Table 2]. Table 1 shows the results of analysis of total nitrogen (TN), and Table 2 shows the results of analysis of nitrate nitrogen (NO ₃ -N). The analytical results are measured according to the water pollution process test method.

                <T-N analysis result> division Raw water (mg / L) Treated water (mg / L) Throughput% Average 30.0 5.8 81.4 Standard Deviation 4.7 3.5 10.0 Minimum value 24.0 0.8 68.5 Value 38.8 11.1 96.6

<NO ₃ -N analysis result> division Raw water (mg / L) Treated water (mg / L) Throughput% Average 24.8 1.6 94.5 Standard Deviation 4.7 2.1 7.0 Minimum value 19.0 0.0 81.8 Value 33.8 6.2 100.0

As shown in [Table 1] and [Table 2] it can be seen that the average has a good throughput of 80% or more, in particular, nitrate nitrogen (NO ₃ -N) has a throughput of 94% or more.

Therefore, in the present invention, in denitrifying waste and sewage containing a large amount of nitrate nitrogen, water insoluble granular carrier 352, granular activated carbon 354 and granular sulfur 356 to which autotrophic denitrifying microorganisms are attached Injected into the denitrification reaction tank 300 filled with a biofilm 350 made of a treatment to increase the contact rate by the formation of voids to maximize the denitrification efficiency and has the effect of adsorption and removal of excess organic matter and suspended solids (SS). .

In addition, the alkalinity is injected and supplied from the outside, but by using sodium hydrogen carbonate (NaHCO ₃ ) to prevent the formation of agglomerated precipitate (CaSO ₄ ) has the effect of preventing the blockage phenomenon of the denitrification reaction tank 300 and the pipe.

Then, sufficient pores are formed by the granule carrier 352, and a part of the smaller particle sulfur 356 is attached to the granule carrier 352, thereby blocking the inside of the reaction tank 300 by the smaller particle sulfur 356. In addition to preventing the phenomenon, the number of operations of the backwash pump can be much reduced than before, thereby reducing power costs.

1 is a schematic diagram illustrating a method for treating biological denitrification of waste and sewage according to a conventional general technique.

Figure 2 shows an exemplary configuration of the biological denitrification apparatus according to the present invention, a configuration showing a downflow device.

Figure 3 shows an exemplary configuration of a biological denitrification apparatus according to the present invention, a configuration showing an upflow device.

Explanation of symbols on main parts of drawing

100: alkalinity storage tank 200: mixing distribution tank

300: denitrification reactor 350: biofilm

352: granular carrier 354: granular activated carbon

356: particle sulfur 380: filter medium

400: raw water storage tank 510: main piping

512: first branch engine 514: second branch engine

520: inlet pipe 540: outlet pipe

P1: alkalinity inflow pump P2: raw water inflow pump

Claims (10)

In the biological denitrification apparatus for waste and sewage, which has autotrophic denitrifying microorganisms and sulfur-filled denitrification reaction tanks so that waste and sewage containing a large amount of nitrate nitrogen flows into the denitrification reaction, An alkalinity storage tank 100 containing sodium hydrogen carbonate (NaHCO ₃ ); Sodium hydrogen carbonate (NaHCO ₃ ) accommodated in the alkali storage tank 100 and the raw water (waste and sewage containing a large amount of nitrate nitrogen) contained in the raw water storage tank 400 is mixed and distributed to the denitrification reaction tank (300) A distribution tank 200; Raw water to be treated in the mixing distribution tank 200 (raw water containing a large amount of nitrate nitrogen and alkalinity (NaHCO ₃ ) mixed) is introduced, and water insoluble with autotrophic denitrifying microorganisms attached thereto. The biofilm (BIO-FILTER, 350) consisting of granular carrier 352, granular activated carbon 354 and particle sulfur 356 is filled, the lower end of the filter medium to prevent the outflow of the biofilm (BIO-FILTER, 350) Biological denitrification treatment apparatus for waste and sewage, characterized in that it comprises a; According to claim 1, wherein the denitrification apparatus is a denitrification tank (a raw water mixed with waste water, sewage and alkalinity (NaHCO ₃ ) containing a large amount of nitrate nitrogen) contained in the mixing distribution tank 200 ( The inlet pipe 520 connected to the mixing distribution tank 200 is connected to the upper portion of the denitrification reactor 300 so that the inlet pipe 520 is processed and discharged in the process of flowing down into the upper portion of the 300, and the treated water outlet pipe 540 is sulfur It is a downflow type device connected to the lower part of the denitrification reactor 300, and the granular activated carbon 354 constituting the biofilm (BIO-FILTER, 350) is filled under the denitrification reactor 300, and the granular activated carbon 354 Biological denitrification treatment apparatus for waste and sewage, characterized in that the mixed particles of the granule carrier 352 and the particle sulfur 356 are filled thereon. According to claim 1, wherein the denitrification apparatus is a denitrification tank (a raw water mixed with waste water, sewage and alkalinity (NaHCO ₃ ) containing a large amount of nitrate nitrogen) contained in the mixing distribution tank 200 ( The inflow pipe 520 connected to the mixing distribution tank 200 is connected to the lower portion of the denitrification reactor 300 so that the inflow and processing of the inflow into the lower portion of the 300 is carried out, and the treated water outlet pipe 540 is sulfur. An upflow type device connected to the upper portion of the denitrification reactor 300, and the granular activated carbon 354 constituting the biofilm (BIO-FILTER, 350) is filled in the upper side of the denitrification reactor 300, and the granular activated carbon 354 is Biological denitrification treatment apparatus for waste and sewage, characterized in that the mixed particles of the granule carrier 352 and the particle sulfur 356 are filled below. According to claim 1, wherein the biofilm (BIO-FILTER, 350) is a ratio of 40 to 60% by weight granular carrier 352, 5 to 15% by weight granular activated carbon 354 and 30 to 50% by weight of particle sulfur (356) Biological denitrification apparatus for waste and sewage, characterized in that consisting of. 2. The biological denitrification treatment apparatus for waste and sewage according to claim 1, wherein the particle sulfur (356) is processed into by-products generated in the desulfurization treatment process of crude oil and has a diameter of 5 to 10 mm. The wastewater and sewage biological denitrification apparatus according to claim 1, wherein the particle sulfur (356) has autotrophic denitrifying microorganisms attached to its surface. The wastewater and sewage biological denitrification treatment apparatus according to claim 1, wherein the granular carrier (352) has a diameter of 5 to 10 mm and a specific gravity in the range of 1 to 1.19. The method of claim 1, wherein the granular carrier 352 is prepared by extrusion molding a mixture of 50 to 70% by weight of waste polyethylene (or derivatives thereof), 10 to 31% by weight of zeolite powder and 5 to 14% by weight of powdered activated carbon. A wastewater and sewage biological denitrification apparatus, characterized in that it is 5 to 10 mm in diameter and has a specific gravity in the range of 1 to 1.19. In the method of biological denitrification of waste and sewage, in which waste and sewage containing a large amount of nitrate nitrogen is denitrified using autotrophic denitrifying microorganisms and sulfur, Biofilm consisting of water-insoluble granular carrier 352, granular activated carbon 354, and granular sulfur 356 attached to the denitrification reactor 300 having the filter medium 380 installed at the bottom thereof. After filling the filter 350, the waste and sewage containing a large amount of nitrate nitrogen is introduced into the denitrification reactor 300 and the alkalinity is supplied to the denitrification reactor 300 from the outside. A method for treating biological denitrification of waste and sewage, characterized by using sodium (NaHCO ₃ ). 10. The biological denitrification treatment method for waste and sewage according to claim 9, wherein the denitrification treatment method is performed using the denitrification treatment apparatus according to any one of claims 1 to 8.