KR200373025Y1 - Device for removing nitrogen from wastewater - Google Patents

Abstract

The present invention relates to a nitrogen removal device of wastewater and wastewater, and a nitrogen removal method using the same. A solid-liquid separation tank is installed inside the denitrification reactor to form an integrated unit, but the volume of the solid-liquid separation tank is 5% to 20% of the total volume of the denitrification reactor. If the volume of the denitrification reactor is the same, the same denitrification treatment efficiency as that of the conventional apparatus can be ensured, so that the entire apparatus can be reduced to a certain volume and downsized, and the denitrification treatment is recycled again through the internal circulation pipe and the influent pipe. Once used for the denitrification process, the denitrification rate is improved and the denitrification efficiency is doubled compared to the conventional apparatus. Accordingly, the volume of the denitrification tank can be reduced, and the inlet water is spread evenly throughout the denitrification tank by forming the conical bottom of the denitrification reactor. Filled in the denitrification reactor Contributing to the denitrification process by improving the efficiency of the denitrification process by allowing the carrier to react evenly with the carrier, it is possible to discharge the foreign matter accumulated in the lower part through the conical part to the outside. By connecting the suspended solids and colloidal material filtered by the filtration membrane to be discharged to the sludge formed by the concentration of the sludge is discharged to the outside without stopping the operation of the device.

Description

Device for removing nitrogen from wastewater {Device for removing nitrogen from wastewater}

The present invention relates to a wastewater treatment apparatus, and more particularly, is located inside an anoxic denitrification tank and a denitrification tank having a denitrifying microorganism attached to the autotrophic denitrification reaction using sulfur, filled with a sulfur carrier, and having an internal circulation pipe. It consists of a solid-liquid separation tank in which a filtration membrane is immersed, and converts and removes nitrate nitrogen and nitrite nitrogen dissolved in waste water into nitrogen gas to provide an integrated system having stability of treatment and economy of equipment and operation. It relates to a wastewater treatment apparatus.

Recently, the purpose of wastewater treatment is to regulate the nutrients such as nitrogen and phosphorus, which are the main culprit of eutrophication, as well as the past purpose such as reduction of biochemical oxygen demand (BOD), suspended solids (SS) and pathogens. It is strengthening.

Nitrogen depletes the dissolved oxygen concentration of water resources, induces toxicity to aquatic organisms, and can cause diseases, resulting in difficulties in reuse of water resources. Therefore, nitrogen removal is of great importance in wastewater treatment.

Many techniques are known in the related art regarding the purification of waste water. In this regard, the prior art regarding nitrogen removal is as follows.

In general, as the most widely used method for removing nitrogen contained in wastewater and wastewater, biological nitrogen removal by nitrification and denitrification using heterotrophic microorganisms is known. This is a process in which ammonia nitrogen (NH ₄ ⁺ -N) is converted to nitrite nitrogen (NO ₂ ^-- N) or nitrate nitrogen (NO ₃ ^-- N) by autotrophic microorganisms. When oxidized to nitrosomonas, Nitrosococcus, Nitrosobacillus, and other microorganisms are involved. When oxidized from nitrous nitrogen to nitrate nitrogen, Nitrobacter and Nitrosocystis are involved. However, the rate of proliferation of autotrophic microorganisms is much slower than that of heterotrophs, and the microbial growth rate is low. Nitrosomonas and Nitrobacter produced 0.15mg-cell / mg-NH ₄ ⁺ -N, 0.02mg-cell / mg-NO ₂ ^-- N, and reduced alkalinity of 7.14mg. A large amount of nitrifying bacteria must be secured and maintained in the reaction tank. Also, a large amount of

Since alkalinity is also required, a pH buffering action is required to control the lowering pH. In addition, temperature, BOD / TKN ratio, and ammonia nitrogen concentration also affect nitrification.

Denitrification is carried out in the presence of dissolved oxygen (DO) in the state in which only bound oxygen such as nitrate nitrogen or nitrite nitrogen is present (anoxic condition) and nitrate nitrogen or nitrite nitrogen is nitrogen gas (N ₂ ) the process of conversion to. Denitrification consists of the conversion of nitrate nitrogen to nitrite nitrogen and the conversion of nitrite nitrogen to N ₂ gas via NO and NO ₂ . Denitrification produces an alkalinity of about 2.3 to 4.4 mg as CaCO ₃ / mg-N. In a system that simultaneously performs nitrification and denitrification, the alkalinity lowered in nitrification can be increased to some extent. However, conventional denitrification using heterotrophic microorganisms requires an organic carbon source as an electron donor.

At present, the most common method of nitrogen removal is circulating nitrification and denitrification using suspended activated sludge. This method consists of an anaerobic tank and an aerobic tank and circulates the wastewater to denitrify in the anoxic tank and nitrify in the aerobic tank. However, this method requires a separate installation of the reaction tank, so a large installation site is required and the aerobic capacity must be increased.

In order to obtain stable treated water with a small reaction tank volume, a method of filling activated sludge or a carrier immobilized with nitrifying or denitrifying bacteria is used instead of suspending activated sludge. However, there is a disadvantage that the carrier cost is high.

As a method of nitrifying and denitrifying in a single tank, there is a batch activated sludge process (SBR process). This process is a variation of the activated sludge method, and five processes of [inflow-reaction-precipitation-discharge-atmosphere] are sequentially performed in one reactor, and in the precipitation process, aeration is stopped to form an oxygen-free tank to perform denitrification. This process has the advantage of a simple device, easy maintenance and low installation and operating costs. However, scum is easy to accumulate in the reactor and a discharge device of supernatant is required. In the case of wastewater with high nitrogen concentration and low organic matter concentration, that is, a low C / N ratio, much energy is required to supply oxygen for nitrification, and an electron donor must be added for denitrification. The most commonly used is methanol. However, in the case of methanol addition, it is difficult to control the proper amount of addition and methanol should not remain in the treated water due to the toxicity of methanol itself. The amount requires more than three times the amount of nitrogen to be treated and the maintenance costs cannot be ignored.

A new technique that supplements the above disadvantages is the denitrification using sulfur.

Denitrification with sulfur is a sulfated microorganisms represented by thio Bacillus Denny pecan tree's (Thiobacillus denitrificans) NO ₂ as the final receptor ^- a denitrification reaction occurs while _{^{using, NO, N 2 O -,}} NO 3.

As O _2, NO ₂ ^- - end products of sulfur denitrification is SO ₄ ^2, NO ₃ ^-, NO, N ₂ O is, but using as the final hydrogen acceptor of sulfation, as the final hydrogen acceptor NO ₂ ^- or NO ₃ ^- more preferred O ₂ because the sulfur denitrification without the O ₂ present nO ₂ ^- can be expected only in the presence of an oxygen-free state ^- or nO _3.

T. denitrificans is absolute CO _2, HCO ₃ by chemical autotrophic microorganisms ^- to grow using the arms of carbon, CO ₃ ^2-, etc. as a carbon source. The sulfation of the ^{_{T. denitrificans S 0, S 2 -}} , S 2 O 3 2-, S 4 O 6 2-, SO 3 2- is a high denitrification efficiencies are low oxidation state sulfur compounds so used as a hydrogen donor. Comparison of the cost of the sulfur compounds in drug costs per electronic equivalent as a hydrogen acceptor in a sulfur denitrification reaction by the T. denitrificans has been reported that S ⁰ is the most cost-effective hydrogen donor (Bisogni, JJr Driscoll, CT Jr. : Denitrification using thiosulfate and sulfide, J. Environ. Eng. Div. Proc. ASCE, Vol. 103, p. 593-604 (1977)).

S ⁰ has the advantages of abundant resources, low cost, easy storage, good handling and no toxicity.

Conventional denitrification techniques using sulfur include Jeon-Tech's wastewater treatment device (Utility Model Registration No. 20-0315887) (hereinafter, referred to as a wastewater treatment device according to an embodiment of the prior art) and Hyundai E & C. There is an integrated sewage treatment apparatus (Utility Model Registration No. 20-0299231) (hereinafter referred to as a sewage treatment apparatus according to another embodiment of the prior art) using an immersion type membrane and sulfur denitrification microorganisms.

Wastewater treatment apparatus according to an embodiment of the prior art is to configure the wastewater inlet pipe 3 and the pump (4) at the bottom of the reaction tank 10 having a predetermined size to inflow wastewater from the lower portion of the reactor (10) In the inside of the reaction tank 10 to be provided with a steel net (9) at regular intervals from the bottom of the reactor 11 to form a gravel layer (1) on the top, sulfur on the top of the gravel layer (1) Carrier (S ⁰ + CaCO ₃ ) (2) is laminated, the upper end of the reaction tank is composed of a gas outlet 8 and the treated water outlet 7 on the side.

Wastewater treatment apparatus according to an embodiment of the prior art configured as described above has the effect of solving the nitrogen problem by using a sulphation denitrification reaction by a simple operation using a material called sulfur and calcium carbonate in a reactor of a single structure.

However, the wastewater treatment apparatus according to an embodiment of the prior art has the effect of denitrification and decolorization, but since there is no disclosure regarding the configuration of removing organic matter such as suspended solids and colloidal substances contained in the wastewater, the concentration of organic matter is low. Wastewater with relatively high concentrations of nitrogen (especially nitrate or nitrite nitrogen) or organic matter is removed from the wastewater treatment process, but nitrogen is rarely removed and is suitable for discharged wastewater, but it is suspended solids (SS) and colloidal Organic matter and turbidity caused by the substance, etc., had a problem that could not be removed.

In addition, the wastewater treatment apparatus according to an embodiment of the prior art has the effect of nitrogen removal by sulfur denitrification, but only once passes the wastewater in the reaction tank 10 to cause the denitrification reaction, so the denitrification treatment efficiency is entirely in the reactor 10. There was a drawback of being limited, depending on the amount of sulfur carrier charged.

In addition, when the wastewater is treated for a long period of time, foreign matters of the wastewater accumulate inside the apparatus. The wastewater treatment apparatus according to an embodiment of the prior art periodically removes the foreign matter of the wastewater and the sludge formed by concentrating it periodically. As there was no description of the device that could be discharged into the furnace, it was necessary to shut down the device and perform a separate cleaning operation in order to remove foreign substances.

Sewage treatment apparatus according to another embodiment of the prior art includes an oxygen generating device and a membrane reaction tank, and provides the oxygen discharged through the oxygen generating device to the membrane reaction tank to remove the organic matter and nitrification reaction occurs; ; It is formed integrally with a separate space portion on the outer periphery of the aeration tank, consisting of a denitrification reaction tank that introduces the treated water passing through the membrane reaction tank to cause a denitrification reaction, so that the aeration tank and the denitrification reaction tank are manufactured to overlap the wastewater treatment apparatus. The effect of reducing the space occupied to a certain volume is provided.

That is, in the wastewater treatment apparatus according to another embodiment of the prior art, the aeration tank 10 has an oxygen generator 33 and a membrane reaction tank 11 therein to cause the removal of organic matter and the nitrification reaction, and the denitrification reaction tank ( 20) is attached to the outer periphery of the aeration tank 10 having a separate space portion in which the ciliated or sulfur-containing media 21 are inserted so that the denitrifying microorganism causing the autotrophic denitrification reaction using sulfur is attached to the wastewater. The denitrification reaction is caused to come into contact with the filtered medium 21.

However, the sewage treatment apparatus according to another embodiment of the prior art has an oxygen generator 33 and an air blower connected thereto to generate oxygen necessary for nitrification in order to cause the organic matter to be removed and nitrification in the aeration tank 10. There is a disadvantage that the manufacturing cost increases due to the large number of components, such as the installation of 32).

In addition, the sewage treatment apparatus according to another embodiment of the prior art has to secure a large amount of nitrifying bacteria in the aeration tank 10 in order to cause the removal of organic matter and the nitrification reaction in the aeration tank 10, the entire apparatus is fixed When attempting to limit the size, the volume of the aeration tank 10 is relatively large and the volume of the denitrification reactor 30 is inevitably reduced. Accordingly, the sewage treatment apparatus according to another embodiment of the prior art is also filled with the ciliated or granular media (21) that is in contact with the waste water in the denitrification tank 30 to cause the denitrification reaction correspondingly, to remove nitrogen There was a problem that the efficiency of denitrification is lowered when viewed in terms of denitrification.

In addition, the sewage treatment apparatus according to another embodiment of the prior art has the effect of denitrification by using the ciliated or granular filter medium 21, but this also causes the denitrification reaction by passing the wastewater only once in the denitrification reactor 20. The denitrification treatment efficiency was limited because it depends solely on the amount of the medium 21 filled in the reactor 10.

In general, when the wastewater is treated for a long time, foreign matters of the wastewater accumulate inside the apparatus. The wastewater treatment apparatus according to another embodiment of the prior art periodically removes the foreign matter of the wastewater and sludge formed by concentrating it. As there is no description of the device that can be discharged to the outside, to remove the foreign matter, the operation of the device had to be stopped and the cleaning operation had to be performed separately.

An object of the present invention for solving the above problems is to reduce the size of the entire device within a certain volume.

Another object of the present invention is to recycle the denitrified influent and use it for the denitrification once again to improve the denitrification rate and double the denitrification efficiency compared to the conventional apparatus.

In addition, another object of the present invention is to provide a device that allows the influent to be evenly spread throughout the denitrification reactor to contribute to the improvement of the denitrification treatment and at the same time periodically discharge the foreign matter of the waste water.

In addition, another object of the present invention is to make it possible to discharge the sludge formed by the concentration of the suspended solids and colloidal material filtered by the filtration membrane to the outside without stopping the operation of the device.

1 is a schematic view of the device of the present invention showing the form of a denitrification reactor and a solid-liquid separation tank integrated reactor.

2 is a configuration diagram and an operational state diagram of the device of the present invention.

3 is a plan view of the subject innovation device.

Figure 4 is a graph showing the pH change during the reaction during the nitrogen removal process using the device of the present invention.

Figure 5 is a graph comparing the treated water quality according to the internal circulation flow rate change in the denitrification reactor of the present invention device.

Figure 6 is a graph comparing the denitrification efficiency according to the change in the internal circulation flow rate in the denitrification reactor of the present invention device.

Figure 7 shows the denitrification efficiency according to the internal circulation and residence time in the nitrogen removal using the subject innovation device.

Figure 8 shows the ratio of the SS concentration in the water treated using the device of the present invention.

* Description of the symbols for the main parts of the drawings *

41 denitrification reactor 42 solid-liquid separation tank

43 gas outlet 44 sulfur carrier

45: filtration membrane 46: inflow pump

47: influent pipe 48: influent control valve

49: treatment water pipe 50: treatment water suction pump

51: blower 52: air supply piping

53: diffuser 54: internal circulation piping

55, 57, 59: valve 56: sludge discharge pipe

58: sludge discharge pipe 60: steel mesh

In order to achieve the above object, the nitrogen removal apparatus in the waste water of the present invention is equipped with a steel net, and a sulfur carrier is stacked on the steel net to fill and denitrify microorganisms causing autotrophic denitrification using sulfur. Attached to the sulfur carrier through the inflow of the waste water, evenly diffused upwards to form a conical shape to form a lower portion of the conical shape so that the denitrification process is introduced through the steel mesh, and the nitrogen containing A denitrification reaction tank having a plurality of gas outlets disposed on an upper surface thereof to discharge nitrogen gas generated while the inflow of the waste water comes into contact with the sulfur carrier to denitrify; Located on the upper side of the inside of the denitrification tank, using a treatment water suction pump to filter the suspended solids and colloidal material of the treated water passed through the denitrification tank and discharge the filtered treated water to the outside BOD, COD and turbidity A solid-liquid separation tank including a filtration membrane to improve the amount; An inner circulation pipe connecting the upper portion of the denitrification tank and the inlet pump, and an inlet pipe connecting the outlet of the inlet pump and the cone of the denitrification reactor; Forming the volume of the solid-liquid separation tank to 5% to 20% of the total volume of the denitrification reactor, it is characterized in that the denitrification efficiency by improving the denitrification treatment by recycling the denitrification treatment through the internal circulation pipe and the inlet pipe.

In this case, the solid-liquid separation tank is formed to be inclined to the bottom and further connected the sludge discharge pipe to the inclined portion to discharge the sludge formed by the suspended solids and colloidal material filtered by the filtration membrane to the outside desirable.

It is preferable that the cone angle of the conical lower part of the denitration reaction tank is 10 degrees-30 degrees.

It is preferable to further connect the sludge discharge pipe to the cone portion of the denitrification reactor to discharge the foreign matter accumulated in the lower portion of the cone to the outside.

The denitrifying microorganism is preferably Thiobacillus denitphiphylls, Thiobacillus thiooxidans, Pseudomonas, or Agrobacterium.

The sulfur carrier is preferably a mixture of sulfur and calcium carbonate (So + CaCO ₃ ).

It is installed extending from the outside of the denitrification tank to the vicinity of the filtration membrane, and a plurality of diffusers are formed at one side, and air is supplied from the diffuser to provide floating solids and colloidal substances attached to the filtration membrane during operation of the filtration membrane installed in the solid-liquid separation tank. It is preferred to further include a removable air supply tubing.

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

Figure 1 is a schematic view of the apparatus of the present invention showing the form of the denitrification reactor and solid-liquid separation tank integrated reactor, Figure 2 is a schematic view and operation state of the device of the present invention, Figure 3 is a plan view of the device of the present invention.

As shown in Figures 1 to 3, the nitrogen-removing device of the sulfur-containing carrier and the filtration membrane integrated waste water of the present invention is a denitrification reactor for denitrifying the influent water of the waste water by stacking and filling the sulfur carrier 44. (41) and a solid-liquid separation tank (42) for filtering suspended solids (SS) and colloidal material of the treated water passing through the denitration reaction tank (41).

Looking at the denitration reaction tank 41 in more detail, the denitrification reaction tank 41 is installed inside the denitrification reactor 41, the denitrification microorganism attached to the denitrification microorganism causing the autotrophic denitrification reaction using sulfur on the steel net 60 is attached and sulfur The carrier 44 is laminated and filled.

Here, the denitrifying microorganisms attached to the carrier 44 containing sulfur filled in the denitrification reactor 41 and causing the autotrophic denitrification reaction using sulfur are not limited thereto, but Thiobacillus denitrificans is not limited thereto. , Thiobacillus thiooxidans, Pseudomonas, Agrobacterium can be used, and preferred among them is Thiobacillus denitrificans.

In addition, the sulfur carrier 44 is rapidly stirred after the addition of an alkaline material (CaCO _3, etc.) that serves to supply the alkalinity after melting the sulfur (S ^o ) particles used as the electron donor of sulfur denitrification microorganisms It is produced by solidifying by cooling, crushed, and the properties vary depending on the added material and the blending ratio, and it is preferable to use a mixture of sulfur and calcium carbonate (S ^o + CaCO ₃ ).

The steel mesh 60 is a steel mesh having a plurality of holes formed therein, and then installed inside the denitrification reactor 41 so that the steel mesh 60 cannot be detached from the bottom, and the reason is that the denitrification reactor 41 has a conical shape. This is because the narrower formed.

On the other hand, when considering the stream line (stream line) of the incoming influent is preferably a cone angle of the conical lower portion of the denitrification reactor 41 is 10 ° to 30 °, but is not limited thereto. Thus, if the lower part of the denitrification reactor 41 is formed in a conical shape, when the wastewater flows in, the inflow of the wastewater flows evenly through the inlet of the cone, and then through a plurality of holes formed in the steel mesh 60. Waste and waste water is introduced to be stacked on the steel mesh 60 is in contact with the filled sulfur carrier 44 is to be denitrified.

At this time, nitrogen gas is generated. In order to discharge the nitrogen gas, a plurality of gas outlets 43 are provided on the upper surface of the denitrification reactor 41.

Next, looking at the configuration of the solid-liquid separation tank 42 in detail, the solid-liquid separation tank 42 is located on the upper side of the inside of the denitration reaction tank 41, the denitrification reaction tank 41 using the treated water suction pump 50. The suspended solids and colloidal material of the treated water having passed through can be filtered through the filtration membrane 45, and the filtered treated water can be discharged to the outside as described in Utility Model Registration No. 20-0299231. It does not remove nitrogen through all the denitrification but only denitrification.

In addition, the solid-liquid separation tank 42 is formed to be inclined the lower surface, it is preferable to configure the inclined lower surface in the form of the upper and lower narrow narrow light, but is not limited thereto.

As such, when the lower surface of the solid-liquid separation tank 42 is formed with a normal light bottom narrow, sludge generated by filtering the suspended solids and colloidal material of the treated water passing through the denitration reaction tank 41 with the filtration membrane 45 is narrow at the bottom. Can be assembled in parts.

The air supply pipe 52 is extended from the outside of the denitration reaction tank 41 to the left side and the bottom of the filtration membrane 45 in the solid-liquid separation tank 42 so that air can be supplied to the filtration membrane 45 by the blower 51. The plurality of diffusers 53 are formed in the air supply pipe 52 so that the air ejected through the air supply pipe 52 can shake off the suspended solids and the colloidal material attached to the filtration membrane 45.

In addition, the suspended solids and colloidal material filtered by the filtration membrane 45 are separated from the filtration membrane 45 by the air blown out by the diffuser 53 and are accumulated below the inclined bottom surface of the solid-liquid separation tank 42. The sludge is concentrated to form a sludge, and the sludge discharge pipe 56 is further connected to the narrow part of the lower portion to discharge the sludge to the outside.

The solid-liquid separation tank 42 removes the SS contained in the denitrification water from the denitrification tank 41 to improve turbidity, and the volume thereof is 5% of the total volume of the denitrification tank 41. It forms to a minimum to 20%, and the remaining part is used as the denitrification reactor 41 in which the sulfur carrier 44 is laminated and filled.

As shown in FIG. 2, the upper part of the denitrification reactor 41 and the inlet of the inlet pump 46 are connected to the inner circulation pipe 54, and the outlet of the inlet pump 46 and the conical part of the denitrification reactor 41 are shown. It is connected to the inflow pipe 47.

When the inflow pump 46 is operated, the waste water flows into the inflow pipe 47 through the inflow pump 46, which is again passed through the conical portion of the denitrification reactor 41, through the hole of the steel mesh 60, and then into the steel mesh ( The denitrification is carried out in contact with the sulfur carrier 44 stacked on top of 60) through a reaction as described in connection with the prior art.

At this time, a part of the treated water denitrified overflows into the solid-liquid separation tank 42 and flows to pass through the filtration membrane 45 for the suspended solids and colloidal material of the treated water passed through the denitrification reactor 41. The filtered and discharged filtered water is discharged to the outside, and the remaining denitrified treated water flows down through the internal circulation pipe 54 by its own weight from the upper portion of the denitrification reactor 41 and enters the inflow pump 46 to enter the inflow water. Flow along the pipe 47. The primary denitrification treatment water flowing along the influent pipe 47 is stacked on the steel net 60 through the conical part of the denitrification tank 41 and the hole of the steel net 60. Contact with and once again to double the denitrification treatment efficiency.

On the other hand, the internal circulation pipe 54 and the inflow water pipe 47 described above are provided with valves 48 and 59, respectively, so that the flow rate flowing along these pipes can be adjusted or opened and closed if necessary.

The sludge discharge pipe 58 is connected to the cone of the denitrification reactor 41, and through this sludge discharge pipe 58, foreign substances accumulated in the lower portion of the cone can be discharged to the outside. The sludge discharge pipe 58 is also provided with a valve 59. While the wastewater is introduced into the denitration reaction tank 41, the valve 59 is closed and the cone of the denitration reaction tank 41 is removed due to a long denitrification treatment. If foreign matters are accumulated in the lower part, the denitrification process is stopped by closing the valve of the inflow water pipe 48, and the valve 59 of the sludge discharge pipe 58 is opened to discharge the accumulated foreign matter.

Hereinafter, the implementation of the nitrogen-containing device in the sulfur-containing carrier and the filtration membrane integrated waste water of the present invention will be described in detail by the following examples.

<Example>

The treatment efficiency was evaluated by applying the device and method of the present invention to the waste water generated in the semiconductor manufacturing plant. As a denitrifying microorganism attached to the sulfur carrier 44 filled in the denitration reaction tank 41 to cause autotrophic denitrification reaction, Thiobacillus denitrificans was used, and sulfur and calcium carbonate were used as the sulfur carrier 44. A mixture of (S ^o + CaCo ₃ ) was used. The influent water quality was pH 6.83 ~ 7.03, TN (Total Nitrogen) 312 ~ 358ppm, SS (Suspended Solid) 18 ~ 26ppm, and most of TN forms were nitrate nitrogen (NO ₃₎ ^- it consists -N). It was operated for about 15 days with a residence time of 24 hours after adapting the wastewater to be treated having such characteristics for about 2 days.

Example 1 Change of pH

Looking at the pH change during the reaction as shown in Table 1 and Figure 4 below, the pH of the influent was 6.83 ~ 7.03, the treated water after the sulfated denitrification tank of the present invention showed a result of rising to 7.69 ~ 8.06. In general, in the case of the denitrification reaction, it is known that the pH decreases with time, so that the denitrification performance is lowered or denitrification is no longer performed. However, the Sulfur Oxidation Denitrification (SOD) method of the present invention not only does not have this problem but also raises the pH. This is because the denitrifying microorganism which causes autotrophic denitrification reaction using sulfur as a filling carrier is attached and the amount of SO ₄ ^2- ions, Ca ²⁺ ions, and CO ₃ ^- ions eluted due to the nature of the carrier containing sulfur is balanced. It is considered to be.

Example 2 Evaluation of Denitrification Efficiency

The denitrification efficiencies of the internal circulation flow rate were compared. As shown in Table 2 and FIG. 5 and FIG. 6, the experiment was performed by operating a total of three reactors including one comparative group without internal circulation and one reactor each with internal circulation set to 2Q and 3Q. Were compared and the same operation conditions were set except for internal circulation. As a result of the experiment, the denitrification efficiency of internal circulation was about 5 ~ 10% better than the reactor without internal circulation, showing 20 ~ 30ppm low nitrogen concentration. In addition, when the internal circulation flow rate was increased, the treatment efficiency was confirmed to increase.

<Example 3> Comparison of denitrification efficiency according to internal circulation and residence time

An experiment was carried out to compare the denitrification efficiency according to whether the internal circulation was carried out and the residence time, and the results are shown in Table 3 and FIG. 7 below. As a result of comparing the treated water of the reactor with internal circulation with 2Q and the reactor without internal circulation, the treated water quality showed 18ppm nitrogen concentration difference at the residence time of 24 hours, and the treatment efficiency showed about 7% difference. In this case, it can be seen that the processing efficiency is improved.

In addition, the denitrification efficiency of the reactor subjected to internal circulation 2Q was measured to be higher than the denitrification efficiency of the residence time of the reactor without internal circulation at 20 hours in the residence time of 20 hours. It can be said that it has the advantage of making the capacity small.

Example 4 SS Removal Efficiency Comparison

In order to understand the application efficiency of the filtration membrane, SS of the sulphate denitrification tank treatment water and the filtration membrane treatment water was analyzed. As a result, as shown in Table 4 and FIG. 8, the SS removal efficiency in the sulfate denitrification tank was 27 to 60%, but after passing through the filtration membrane, the SS concentration was removed to about 1 ppm to obtain a very clean treated water.

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is to be construed that all changes or modifications derived from the meaning and scope of the utility model registration claims to be described later rather than the detailed description and equivalent concepts thereof are included in the scope of the present invention.

According to the above-described configuration, the nitrogen removal apparatus of the waste water of the present invention is formed in one piece by installing a solid-liquid separation tank in the denitrification reactor, so that the volume of the solid-liquid separation tank is 5% to 20% of the total volume of the denitrification reactor. If the volume of the denitrification reactor is the same, it is possible to secure the same denitrification treatment efficiency as the conventional apparatus, so that the entire apparatus can be reduced to within a certain volume and miniaturized.

In addition, the present invention improves the denitrification rate and doubles the denitrification efficiency compared to the conventional apparatus by recirculating the denitrified inflow water through the internal circulation pipe and the influent water pipe and using it for the denitrification treatment once again, thereby increasing the volume of the denitrification reactor. Can be made small.

In addition, the present invention has a conical shape of the bottom of the denitrification tank so that the inflow water is evenly diffused into the entire denitrification reactor filled in the denitrification reactor.

By allowing the sulfur carrier to react evenly, it contributes to the improvement of the denitrification treatment efficiency and at the same time, it is possible to discharge the foreign matter accumulated in the lower portion through the cone.

In addition, the present invention is formed by inclining the bottom of the solid-liquid separation tank and by additionally connecting the sludge discharge pipe to the inclined portion by allowing the suspended solids and colloidal material filtered by the filtration membrane to be concentrated to discharge the sludge to the outside Has the effect of discharging sludge to the outside without stopping the operation of the device

Claims (7)

The steel mesh 60 is installed and the sulfur carrier 44 is stacked and filled on the steel mesh 60, and denitrifying microorganisms causing autotrophic denitrification using sulfur are attached to the sulfur carrier 44 through microbial culturing. In addition, the inflow of the waste water is spread evenly upwards to form a lower portion of the conical shape so as to flow through the steel net 60 to denitrification, and to form an inlet at the cone, and the inflow of wastewater containing nitrogen A denitrification reaction tank 41 having a plurality of gas outlets 43 provided on the upper surface thereof to discharge nitrogen gas generated while being in contact with the sulfur carrier 44 to be denitrified; Located on the upper side of the inside of the denitrification reactor 41, by using the treated water suction pump 50, the suspended solids and colloidal material of the treated water passing through the denitrification reactor 41 is filtered and the filtered treated water A solid-liquid separation tank 42 including a filtration membrane 45 which is discharged to the outside to improve BOD and COD and turbidity; An inner circulation pipe 54 connecting the upper portion of the denitrification reactor 41 and the inflow pump 46; An inlet water pipe 47 connecting the outlet of the inlet pump 46 and the cone of the denitrification reactor 41; Denitrification by forming the volume of the solid-liquid separation tank 42 to 5% to 20% of the total volume of the denitrification reactor 41 and recycling the denitrified inflow water through the internal circulation pipe 54 and the influent pipe 47. Nitrogen removal device in the waste water, characterized in that the treatment efficiency is improved. According to claim 1, The solid-liquid separation tank 42 is formed to be inclined lower surface and the sludge discharge pipe 56 is further connected to the inclined portion of the suspended solids and colloidal material filtered by the filtration membrane 45 Nitrogen removal device in the waste water, characterized in that the concentrated sludge formed can be discharged to the outside. The nitrogen removal apparatus of the wastewater according to claim 1, wherein the conical angle of the conical lower portion of the denitrification reactor (41) is 10 ° to 30 °. The method of claim 1, wherein the sludge discharge pipe 58 is further connected to the conical part of the denitrification tank 41 to remove the foreign matter accumulated in the lower conical part to the outside to remove nitrogen from the waste water. Device. According to claim 1, wherein the denitrifying microorganism is Thiobacillus denitrificans, Thiobacillus thiooxidans, Pseudomonas, or Agrobacterium (Agrobacterium) characterized in that · Nitrogen removal device in wastewater. The nitrogen removal apparatus of the wastewater according to claim 1, wherein the sulfur carrier (44) is a mixture of sulfur and calcium carbonate (So + CaCO ₃ ). 3. The air purifier according to claim 1 or 2, which extends from the outside of the denitration reaction tank (41) to the vicinity of the filtration membrane (45) and has a plurality of diffusers (53) formed on one side to supply air from the diffusers (53). When the filtration membrane 45 installed in the solid-liquid separation tank 42, the air supply pipe 52 for removing the suspended solids and colloidal substances attached to the filtration membrane 45 is further characterized in that it further comprises Nitrogen removal system in wastewater.