KR100551914B1 - Dmr:(dai-ho microbe revolution) - Google Patents

Abstract

The present invention installs a carrier rotator in which a plurality of carrier units filled with a plurality of composite carriers along a circumferential direction is installed in an aerobic tank, and a reactor at the front end of the aerobic tank is installed in an anaerobic tank to remove nitrogen for influent even if the inflow BOD is low. It is an object of the present invention to provide a method for treating sewage using a carrier rotator, which improves efficiency and removes phosphorus easily by biological treatment.

The object of the present invention comprises the steps of: providing a wastewater advanced treatment facility as a distribution tank-anoxic tank-aerobic tank-sedimentation tank-sludge storage tank-discharge tank; Dividing the anoxic tank and the aerobic tank as a biological reaction tank and immersing the carrier rotator in which the carrier unit filled with the composite carrier in the aerobic tank is assembled along the circumferential direction; Through the flow adjusting tank and the distribution tank, the inflow water introduced at a low inflow BOD of 80-120mg / L flows into the anoxic tank and the denitrification reaction occurs by the stirring action of the agitator installed in the anoxic tank, so that the nitrogen removal efficiency is increased. Steps; As the inflow water flows into the aerobic tank, a plurality of carrier rotors installed in the aerobic tank in a horizontal direction rotate in a direction opposite to the inflow direction of the inflow water, so as to decompose organic matter and intake of phosphorus by the composite carrier filled in the carrier rotor. It is achieved by the step made.

 Advanced sewage treatment method, anoxic tank, aerobic tank, carrier rotator, carrier unit, composite carrier

Description

Advanced treatment of sewage using a carrier rotor {DMR: (Dai-ho Microbe Revolution)}

Figure 1a is a process chart for the advanced treatment of sewage using a carrier rotor according to the present invention,

Figure 1b is a schematic diagram showing an advanced treatment facility for the advanced treatment of sewage using a carrier rotor according to the present invention,

Figure 2 is a perspective view showing a carrier rotator used in the advanced sewage treatment method according to the present invention,

3 is a perspective view showing a carrier unit used in the carrier rotator of FIG.

4 is a process chart showing a conventional A ² / O method,

5 is a process chart showing a conventional MUCT method;

6 is a process chart showing a conventional VIP method,

7 is a process chart showing a conventional DNR method;

<Explanation of symbols for the main parts of the drawings>

10: distribution tank 20: anoxic tank

30: aerobic tank 40: sedimentation tank

50: sludge storage tank 60: discharge tank

300: carrier rotation 301: composite carrier

302: carrier unit 303: external housing

304: internal housing

The present invention relates to a method for advanced treatment of sewage using a carrier rotator, and more particularly, a carrier rotator in which a plurality of carrier units filled with a plurality of composite carriers is installed in an circumferential direction, and a front end portion of the aerobic tank. By installing the reactor in an oxygen-free tank, even if the inflow BOD is low, while improving the nitrogen removal efficiency and at the same time, the removal of phosphorus relates to a method for advanced treatment of sewage using a carrier rotor to be removed by biological treatment.

Generally, sewage, factory waste, and food waste sediment, livestock manure, and other contaminated water are the main pollutants in rivers.These sewage and contaminated water are purified by sewage treatment plants in each city. It is discharged to the river.

The sewage treatment plant installed in each city is designed and constructed to handle the amount of sewage discharged per day in the city.However, as the population density continues to increase, the amount of sewage discharged is increased. It should also be enlarged by enlargement. The expansion and new construction of such a large sewage treatment plant has various difficulties due to the complex selection of construction sites, budget and compensation issues, operation and securing of professional personnel.

Similarly, even in small and medium-sized cities with few inhabitants, new construction of sewage treatment plants has various difficulties such as budget and site selection.

However, it is clear that the sewage treatment plant treating domestic sewage and various polluted waters is an essential facility in consideration of the prevention of pollution of rivers and groundwater and the protection of river ecosystems. Therefore, the construction of sewage treatment plants for each city must be made.

The existing sewage treatment facilities and construction methods are as follows.

4 is a process chart showing the conventional A ² / O (Anarobic / Anoxic Aerobic) method, an anoxic tank is installed between an anaerobic tank and an aerobic tank in the A / O (Air Products and Chemicals) method to remove nitrogen and phosphorus simultaneously. It shows the method to do. In the conventional A ² / O method, the F / M ratio is 0.15 to 0.25 kg · BOD / kg · MLVSS · day and the solids retention time (SRT) is 4 to 7 days. The hydraulic retention time (HRT) is 0.5-1.5 hours for anaerobic sections, 0.5-1.0 hours for anaerobic sections and 3.5-6.0 hours for aerobic sections, and the average MLSS of the aeration tank is maintained at 3,000-5,000 mg / l.

The existing A ² / O process includes a circulation stage of the denitrification tank from the aerobic tank. At this time, the circulated influent reaches 100-300% of the total influent and can remove about 70% of nitrogen, but the phosphorus removal rate Has the disadvantage of falling, and in order to process the high phosphorus sand filter or a separate chemical treatment device is required, the winter operation has a disadvantage that the operating efficiency is greatly reduced.

FIG. 5 is a process chart showing a conventional Modified Univrsity Cape Town (MUCT) method.

Existing MUCT method improves efficiency by separating anoxic tank into 1st anoxic tank and 2nd anoxic tank in order to compensate for the shortcomings of the above-mentioned A ² / O method. The first anoxic tank can reduce only nitrates in the conveying sludge. The second anaerobic bath receives and removes much more nitrate when receiving the mixed liquid returned from the nitrification zone.

However, such a MUCT method has a disadvantage in that the power cost is increased and maintenance is complicated by the addition of an internal transfer pump, and the microbial retention time is 10 to 30 days, which is longer than other methods.

6 is a flowchart illustrating a conventional VIP (Virginia Initiativ Plant) method.

The existing VIP method is another variation of the MUCT method, which provides an anaerobic zone at the multi-stage stage of anaerobic tank, anaerobic tank and aerobic tank, and has a solids residence time (SRT) of 5-10 days, which is shorter than the MUCT method and operates at a much higher load rate. . The mixed liquor to the anaerobic tank is drawn from the last anaerobic zone. Therefore, while the removal ability of phosphorus is high, the removal rate of nitrogen is significantly lower than other methods.

7 is a flowchart illustrating a conventional Dae-woo Nutrient Removal (DNR) method.

The existing DNR method improves the efficiency of phosphorus release in the anaerobic tank by denitrifying nitrogen nitrate in the sludge storage tank, which is an advantage of the MUCT method and VIP method described above, to compensate for the shortcomings of the A ² / O method. It is a construction method. This method is suitable for low concentration influent and stable removal rate of nitrogen and phosphorus, but has a disadvantage that the reaction tank is too large and requires a long residence time and a large land area.

Such a conventional sewage treatment method has a common focus on the removal of nitrogen and phosphorus, resulting in an increase in construction costs and maintenance costs, causing complex and difficult problems of maintenance and repair.

In view of this point, the applicant of the present application has already registered (Registration No. 0477841) for the "carrier rotor filled with a composite carrier and the advanced treatment method of sewage using the same".

The above patents are passed through the carrier rotator which rotates and drives the inflow water entering the aerobic tank through the settling basin-first settling tank-anaerobic tank as opposed to the inflow direction of the inflow water, while passing through the complex carrier filled therein, the sludge desorption This is a technology that can maximize the efficiency of decomposition of organic and organic matter and the removal efficiency of nitrogen and phosphorus and increase the treatment efficiency of influent due to the short residence time of influent. Unlike the existing process, the influent passed through an aerobic tank is returned to the anaerobic tank internally. There is no need for the process, which can greatly reduce the power cost, and there is no need for a separate chemical treatment facility, so the cost of the facility is low, and the operation is simple in the process, so it is easy to maintain and maintain. This technique can be usefully applied to.

However, the applicant's registered patent is to install a carrier rotator in an aerobic tank or an anaerobic tank in a sewage treatment facility consisting of an anaerobic tank, an aerobic tank, and a sedimentation tank. In the case of low inflow BOD, the efficiency of nitrogen removal was rather low.

The present invention has been invented to solve the above disadvantages, in consideration of the fact that the inflow BOD of the current sewage treatment plant, most of which adopts a confluent sewage pipe, is introduced at a low amount of 80-120 mg / L. The purpose of the present invention is to provide a high-level treatment method for sewage using a carrier rotator to increase the 153% of the aerobic tank at the front end of the aerobic tank and to remove phosphorus by biological treatment.

In the present invention for achieving the above object in the advanced treatment method of sewage,

Providing an advanced treatment facility of sewage as a distribution tank, anoxic tank, an aerobic tank, a settling tank, a sludge storage tank, and a discharge tank; Dividing the anoxic tank and the aerobic tank as a biological reaction tank and immersing the carrier rotator in which the carrier unit filled with the composite carrier in the aerobic tank is assembled along the circumferential direction; Through the distribution tank, the inflow water with a low inflow BOD of 80-120mg / L flows into the anoxic tank and the sludge separated from the sedimentation basin through the aerobic tank is returned, so that the denitrification reaction occurs, and the nitrogen removal efficiency is increased. Becoming a step; As the inflow water flows into the aerobic tank, a plurality of carrier rotors installed in the aerobic tank in a horizontal direction rotate in a direction opposite to the inflow direction of the inflow water, so as to decompose organic matter and intake of phosphorus by the composite carrier filled in the carrier rotor. It provides a method for advanced treatment of sewage using a carrier rotor filled with a composite carrier, characterized in that it comprises a step made.

In a preferred embodiment, the NH ₃ -N contained in the inflow water introduced into the aerobic tank is characterized in that it is changed to NO ₃ -N by the nitrifying microorganism attached to the complex carrier.

In a preferred embodiment, the influent treated in the aerobic tank is discharged to the discharge tank via the settling tank, characterized in that the further step of returning the sludge part of the final settling tank from the sludge storage tank to the distribution tank.

In a more preferred embodiment, NO ₃ -N contained in the sludge returned to the distribution tank is characterized in that it is introduced into the anoxic tank is denitrified by the denitrification microorganism.

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

1 is a process chart for the advanced treatment of sewage using a carrier rotor according to the present invention.

The present invention focuses on the fact that the biological reaction tank is divided into the anoxic tank and the aerobic tank, and the carrier unit filled with the composite carrier in the aerobic tank is immersed in the carrier rotator assembled along the circumferential direction.

By using the aerobic tank in which the anoxic tank and the carrier rotator are immersed, the inflow BOD of the current sewage treatment plant adopting the combined sewage pipe can treat low inflow water with 80-120mg / L, and increase the sludge return to 70 ~ 153%. Further denitrification occurs in the anaerobic bath disposed at the front end of the aerobic tank, and the removal of phosphorus can be removed by biological treatment in the aerobic tank.

Advanced treatment facilities for the advanced sewage treatment method of the present invention, as shown in Figure 1a and 1b, distribution tank 10-anoxic tank 20-aerobic tank 30-sedimentation tank 40-sludge storage tank 50 -Arranged in the order of the discharge tank (60).

At this time, the anoxic tank 20 and the aerobic tank 30 is composed of independent spaces separated from each other as a biological reaction tank, in particular, the carrier unit 302 filled with the composite carrier 301 in the aerobic tank 30 in the circumferential direction The carrier rotor 300 assembled according to the above is immersed.

Here, a brief look at the structure of the carrier rotor with reference to the accompanying Figures 2 to 3 as follows.

The carrier rotor 300 is a technology already registered by the present applicant (Registration No. 0477841), the hollow outer housing 303 and the outer housing 303 is formed a plurality of holes in the entire surface, the outer housing 303 In the space between the outer housing 303 and the outer housing 303 and the inner housing 304 of the same length installed to form a partition in the space of the circumferential direction is arranged at the same time and arranged several along the longitudinal direction, Hollow carrier unit 302 having a plurality of holes formed on its entire surface, a plurality of composite carriers 301 filled in the carrier unit 302, and rotating shafts attached to both sides of the outer housing 303. And a driving unit connected to the rotary shaft and a control unit for controlling the driving of the driving unit.

The carrier rotor 300 of this configuration is installed in the aerobic tank 30 so as to rotate in a direction opposite to the inflow direction of the inflow water.

Meanwhile, a plurality of composite carriers 301 are filled in the carrier unit 302 included in the carrier rotor 300, and the composite carriers 301 are jointly registered by the applicant and the Korea Institute of Chemical Technology. Registration No. 0481973) is a microbial composite carrier prepared by mixing, forming, and reacting an organic material including an inorganic material and a polymer with a pore-forming agent.

As such, looking at the advanced sewage treatment method of the present invention using the carrier rotor 300 immersed in the anaerobic tank 20, the aerobic tank 30 and the aerobic tank 30 as follows.

Via the distribution tank 10, the inflow water introduced at a low inflow BOD of 80-120mg / L is introduced into the anoxic tank 20.

Thus, the inflow water and the sludge conveyed by the stirring action of the stirrer installed in the anoxic tank 20 are mixed to generate a denitrification reaction, thereby increasing the nitrogen removal efficiency.

Next, the inflow water is introduced into the aerobic tank 30 from the anaerobic tank 20, the inlet water is introduced into the aerobic tank 30, and several carrier rotors 300 installed in the aerobic tank 30 in the horizontal direction inflow of the inflow water It will rotate in the opposite direction.

Therefore, decomposition of organic matter and intake of phosphorus are made by the microorganisms attached to the composite carrier 301 filled in the carrier rotor 300.

More specifically, when the concentration of the inflow water flowing into the aerobic tank 30 is detected at a high concentration with excess sludge adhesion, the rotation speed of the carrier rotor 300 is increased, and if the concentration of the influent is detected at a low concentration with no sludge attachment. Speed control to reduce the rotational speed of the carrier rotor 300, so that the inlet water in the state in which the carrier rotor 10 rotates at a high speed or a low speed in accordance with the concentration of the influent water is arranged in the inside of the carrier rotor (10) Through the hole of the carrier unit 302 of the inside, the inflow water is permeated to the composite carrier filled in each of the carrier unit 302.

Accordingly, when the inflow water passes through the composite carrier 301 filled in the carrier unit 302, the microorganism is attached to the composite carrier having open / close pores with a diameter of 50 to 500 µm suitable for the microbial habitat environment. Because it rotates in the opposite direction to the influent, the contact efficiency is very high, and the adsorption power of the pollutants is very good, so that decomposition of organic matter and intake of nitrogen and phosphorus occur easily.

In this case, NH ₃ -N included in the inflow water introduced into the aerobic tank 30 is changed to NO ₃ -N by the nitrifying microorganisms attached to the composite carrier 301.

Next, the inflow water treated in the exhalation tank 30 is discharged to the discharge tank 60 via the settling tank 40, a part of the sludge of the final settling tank 40 from the sludge storage tank 50 distribution tank (10) Is returned.

That is, the inflow water treated in the exhalation tank 30 enters the settling tank 40 and is collected by a sludge collector installed at the bottom thereof, and is collected by the sludge storage tank 50 in communication with the settling tank 40. The sludge is returned to the distribution tank at a sludge return rate of at least 70% and at most 153%.

Subsequently, NO ₃ -N contained in the sludge returned to the distribution tank 10 is introduced into the anoxic tank 20 to be denitrated by the denitrification microorganism, thereby further improving the nitrogen removal efficiency.

Accordingly, in the case of influent water having a low inflow BOD, the sludge is returned to the distribution tank 10 as described above, and the sludge is re-introduced into the anaerobic tank 20 disposed at the front end of the aeration tank 30. It is possible to increase the nitrogen removal efficiency by the denitrification reaction (30).

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are not intended to limit the present invention.

Example

The sewage terminal treatment plant operated by the standard activated sludge method is selected, and the advanced treatment facility for the advanced treatment of sewage according to the present invention is constructed as a distribution tank-anoxic tank-aerobic tank-sedimentation tank-sludge storage tank-discharge tank, and The anoxic tank and the aerobic tank were divided as a reaction tank, and the carrier unit filled with the composite carrier in the aerobic tank was immersed in the carrier rotator assembled along the circumferential direction.

Sewage flowed into the advanced treatment facility, and the operating factors were 6.5 hours (HRT) and 2 hours anoxic tank, 4.5 hours aerobic tank, and average MLSS (Mixed Liquor Suspended Solids). 3,520mg / ℓ, DO 2.6mg / ℓ, SRT (Solids Retention Time) 21day, F / M ratio is 0.17kgBOD / kgMLSS · d, BOD volume loading rate 0.58kgBOD / ㎥d, sludge return rate from sludge storage tank to 100% , Water temperature is 16.4 ℃.

The above operating factors are summarized in the following Table 1, and the analysis table comparing the results of the water treatment efficiency between the influent and the discharged water (treated water) under these operating factors is shown in the following Table 2.

Comparative example

Analysis of treated water composition of the existing sewage treatment plant (20,000 tons / day) by standard activated sludge method is shown in Table 3 below, and the analysis results of influent and treated water are shown in Table 4 below.

At this time, the standard activated sludge method was operated and the hydraulic residence time of the aeration tank was 7 to 8 hours.

As described in the above Examples and Comparative Examples, comparing the treatment efficiency between the existing standard activated sludge method and the sewage treatment method according to the present invention is as shown in Table 5 below.

As shown in Table 5 above, BOD, COD, SS, TN, and TP are 97.3%, 88.4%, 95.9%, 71.4%, and 76.2%, respectively. It was found to increase compared to the activated sludge method.

On the other hand, as a result of analyzing the strains of the microorganisms inhabiting the composite carrier of the carrier rotator according to the present invention, as shown in Table 6 and Table 7, 8 ammonia oxidizing bacteria, 7 nitrous oxide bacteria, phosphorus intake bacteria 6 Species, four kinds of denitrifying bacteria were observed, and eventually these microorganisms appeared to live in the complex carrier.

As described above, according to the advanced treatment method of sewage using the carrier rotator according to the present invention, in consideration of the fact that the inflow BOD of the current sewage treatment plant adopting the confluence sewage pipe is introduced at a low 80-120mg / L, By arranging the anoxic tank at the front end of the aerobic tank in which the rotator is immersed, the sludge conveying amount can be increased to 70 to 153% so that denitrification reaction can occur in the aerobic tank to increase the nitrogen removal efficiency, and the removal of phosphorus is performed by biological treatment in the aerobic tank. It offers the advantage of being eliminated.

In particular, the advanced treatment of sewage using the carrier rotator of the present invention, unlike the conventional method, does not require a separate chemical treatment process and internal conveying process, and thus, there is an advantage that the operation cost and operation cost are low and maintenance is easy in the facility and process. Therefore, it can be usefully applied to small and medium new sewage and wastewater treatment plants.

Claims (3)

In the advanced treatment method of sewage, comprising the step of providing the advanced treatment facility of sewage as an distribution tank-anoxic tank-aerobic tank-sedimentation tank-sludge storage tank-discharge tank, 1) dividing the anoxic tank and the aerobic tank as a biological reaction tank and immersing the carrier rotator in which the carrier unit filled with the composite carrier in the aerobic tank is assembled along the circumferential direction; 2) Through the distribution tank, the inflow water with a low inflow BOD of 80-120mg / L flows into the anoxic tank and the sludge separated from the sedimentation basin through the aerobic tank is returned, so that the denitrification reaction occurs, the nitrogen removal efficiency This step of increasing; 3) The inlet water is introduced into the aerobic tank and a plurality of carrier rotors installed in the aerobic tank in a horizontal direction rotate in a direction opposite to the inflow direction of the inlet water, so as to decompose organic matter of the influent by the composite carrier filled in the carrier rotor. Phosphorus intake is made; Advanced treatment of sewage using a carrier rotor filled with a composite carrier, characterized in that consisting of. The method according to claim 1, As the carrier unit filled with the composite carrier is rotated opposite to the inflow direction of the inflow water, the carrier rotator assembled along the circumferential direction, NH ₃ -N contained in the inflow water introduced into the aerobic tank is nitrified to Advanced treatment of sewage using a carrier rotor filled with a composite carrier, characterized in that the change to NO ₃ -N by microorganisms. The method according to claim 1, The inflow water treated in the aerobic tank is discharged to the discharge tank via the settling tank, and a part of the sludge of the final settling tank is returned from the sludge storage tank to the anoxic tank through the distribution tank, and is further included in the NO ₃ -included in the conveying sludge. N is an advanced treatment of sewage using a carrier rotor filled with a composite carrier, characterized in that the denitrification by the denitrification microorganism.

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