KR100709234B1 - A water surface blocker of basin in advanced biological nutrient removal process for high efficiency - Google Patents

Abstract

The present invention provides a floating surface surface difference unit (B) having a plurality of floating individual blockers (b) coupled to the connecting pins 20 in a vertical and horizontal manner to each reactor tank surface of a sewage treatment plant to which a biological advanced sewage treatment method is applied. By installing the, it flows freely along the surface of the water generated in spite of the water surface wave, and effectively blocks and reduces the effect of oxygen that can melt from the air by blocking and minimizing the gas-liquid contact surface between the wastewater and the atmosphere in the reactor. To maximize the reaction characteristics in the anaerobic and anaerobic tanks of the biological advanced sewage treatment method to remove nutrients such as nitrogen and phosphorus and to improve the treatment efficiency. The present invention can be expected to have additional effects such as increasing the aeration efficiency in the reaction tank (aeration tank) of the existing general activated sludge method or the aerobic tank of the advanced sewage treatment method as well as the anaerobic and anaerobic tank of the advanced sewage treatment method. In addition, by blocking the water surface of the reactor can prevent the evaporation and scattering of odorous substances in the waste water in the air, and various side effects such as improving the sewage treatment plant can be expected.

Injury, Surface Difference, Water Surface, Blocking, Anaerobic, Anaerobic Tank, Flow

Description

A water surface blocker of basin in advanced biological nutrient removal process for high efficiency

1 is a bottom view showing the installation state of the water tight cover of the waste water treatment plant abandoned tank according to the prior art,

Figure 2 is a cross-sectional view of the waste water treatment plant aeration tank according to the prior art installed the water tight cover shown in Figure 1,

3 is a partially exploded perspective view showing the configuration of a surface difference unit according to the present invention;

4 is a cross-sectional view of a surface difference unit according to the present invention;

5 is a flow diagram of the surface difference unit according to the present invention,

6 is a graph comparing the denitrification rate difference for each unit time;

7 is a cumulative demass comparison graph,

8 is a graph showing changes in non-denitrification rate.

* Explanation of symbols for main parts of the drawings

10: rectangular body 12: male coupling portion

13: connecting pin insertion hole 14: female coupling portion

15: fixing groove 16: when

17: bracket 18: upper surface

20: connecting pin b: individual block

B: Surface Difference Group 30: Reactor

The present invention relates to a floating water surface unit of a reactor for an advanced sewage treatment plant for improving treatment efficiency. The present invention is installed floatingly on the surface of each reactor in a sewage treatment plant to which a biological advanced sewage treatment method is applied to the waste water and the atmosphere in the reactor. By minimizing the gas-liquid contact surface, it effectively blocks and reduces the effects of oxygen that can be dissolved from the atmosphere, thereby maximizing the reaction characteristics in the anaerobic and anaerobic tanks of the biological advanced sewage treatment method, thereby removing nutrients such as nitrogen and phosphorus and improving treatment efficiency. It was intended to be planned. In particular, the present invention can be expected to have additional effects, such as anoxic and anaerobic tanks, as well as increase the aeration efficiency in the aerobic tank of the conventional general activated sludge method or aerobic tank of the advanced sewage treatment method, and to prevent the fall of water temperature in winter. By blocking the surface, odors can be suppressed by preventing evaporation and scattering of odorous substances in the wastewater in the air, and various effects such as improving the appearance of sewage treatment plant can be expected.

In order to comply with the recently strengthened water quality standards and to remove nitrogen and phosphorus, interest and efforts have been increased to convert the general activated sludge process, which has taken up the majority of domestic sewage treatment plants, to an advanced sewage treatment method capable of removing nitrogen and phosphorus. There is a situation. Many advanced treatment methods have been proposed and constructed so far, but all advanced sewage treatment methods for the purpose of removing nitrogen must have anoxic and anaerobic tanks in the system, and these reactors must have the greatest possible effect on dissolved oxygen (DO). If you do so, you can get the nitrogen and phosphorus removal effect you originally expected.

The prior art related to the present invention discloses a surface-tight cover type sewage treatment method of the waste water treatment plant abandoned tank of Patent Publication No. 2001-0054714 (published date of publication 2001.07.02), which is shown in FIG. In the sewage treatment plant where the aeration method is used to remove organic matter, nitrify, biological dephosphorization and denitrification in the aeration tank 3, the watertight cover 1 having the exhaust groove 2 formed on the bottom thereof has a number of It is installed on the surface to abandon the water temperature rise and dissolved oxygen concentration (DO) of the aeration tank (3) to increase the efficiency of sewage treatment and to suppress the occurrence of odor, this water tight cover 3 is made of styrofoam, A triangular exhaust groove (2) is formed on the bottom to smooth the flow of bubbles floating to the water surface.

In Fig. 1, reference numeral 4 denotes an diffuser, and reference numerals 5 and 6 denote blowers and heaters, respectively.

On the other hand, the above-described conventional water-tight cover is the only main purpose to increase the sewage treatment efficiency by raising the water temperature of the aeration tank and increasing the dissolved oxygen concentration (DO), but the material and shape is a simple integrated plate type The gap between the gas-liquid surfaces is generated in the turbulence of the upper surface generated when giving up, which makes it difficult to effectively block the gas-liquid contact surface.

In addition, in the case of the conventional barrier membrane fixing device (Utility Model Registration No. 266495) developed for the purpose of blocking odor, the barrier membrane support is prevented by covering the upper part of the sewage treatment plant instead of blocking the water surface. It required a separate steel structure such as.

The present invention maximizes the characteristics of each reaction tank by minimizing the gas-liquid contact surface between the wastewater and the atmosphere by using a floating water surface difference unit on the surface of each reaction tank of the sewage treatment plant to which the biological advanced sewage treatment method is applied. By minimizing the dissolution of oxygen in the water, it is possible to increase the denitrification efficiency and maximize the phosphorus release, thereby inducing the treatment efficiency of the advanced sewage treatment plant. In addition, the rectangular body is simple to transport and assemble, so it can be installed, constructed and operated irrespective of the shape and size of the reactor, and has excellent adaptability even in the case of the method of changing the height of the water, such as the SBR method. Have.

The specific object to be achieved through the present invention is first, using a rigid floating blocker that flows along the fluid gas-liquid contact surface where turbulence occurs to exclude the influence of oxygen in the atmosphere and can effectively block the ingress of oxygen efficiently Therefore, the purpose is to increase the treatment efficiency of the advanced sewage treatment method by blocking and minimizing the influence of atmospheric oxygen in the anaerobic and anaerobic tanks of the advanced sewage treatment method.

Second, the present invention is to provide a caterpillar coupled type device easy to install and manage irrespective of the structure and size of the treatment plant reaction vessel during construction and operation of the unit grid type floating block.

Third, the present invention provides a water surface difference element that can be applied to a method having a water level change, such as minimizing the effect of turbulence on the water surface due to aeration and agitation.

Fourth, the present invention is to improve a variety of requirements, such as increased efficiency of aeration in the aerobic tank and maintaining the water temperature during the winter season, preventing odor and improving the appearance of the sewage treatment plant.

In order to achieve the above object, the present invention forms a coupling portion for coupling with adjacent blockers and connecting pins in all directions of the rectangular body so that a plurality of individual blockers are continuously coupled horizontally and horizontally and floated on the water surface of the reactor. It provides a water surface difference unit of the sewage treatment plant reactor that is maintained in close contact with the water surface despite the fluid flow in the state.

In the present invention, the rectangular body of the individual blocker has a lower surface in which the middle portion is convex and upwardly inclined to the outside, and a middle surface is convex and downwardly inclined downward to prevent the air bubbles floating in the water from staying for a long time. On the side, water (droplets) can flow down the body.

In addition, in the present invention, the rectangular body is injection molded or blow-molded in a hollow state in order to secure buoyancy.

Hereinafter, with reference to the accompanying drawings, preferred embodiments that do not limit the present invention will be described in detail.

3 is a perspective view showing the structure of the water surface difference unit according to the present invention, and FIG. 4 is a cross-sectional view of the water surface difference unit according to the present invention.

3 and 4, the water surface difference unit (B) according to the present invention is coupled to be coupled to the individual blocker (b) and connecting pins 20 adjacent to the four sides of the rectangular body (10). (12, 14) is formed so that a plurality of individual blockers (b) are coupled longitudinally and horizontally, while floating with the water surface in the state of floating on the water surface of the reaction vessel while maintaining a close state.

The body 10 of the individual blocker (b) forming the water surface difference unit according to the present invention has a generally rectangular shape when viewed in plan view, and the outer portion of the body 10 has a generally flat concave-convex coupling portion ( 12 and 14 are formed to have a shape like a puzzle piece, and are coupled to each other by a connecting pin 20 in such a manner as to form a puzzle piece having the same shape as an adjacent individual block b.

As can be seen in the cross-sectional view of FIG. 4, the inside of the rectangular body 10 of the individual blocking body b forming the water surface difference unit B according to the present invention is formed in a hollow state to form buoyancy. Although the individual blockers (b) according to the present invention can be molded and manufactured by injection molding or blow molding using conventional synthetic resin materials such as polyethylene, polypropylene, and nylon resin.

Preferably, the individual blocker (b) of the present invention has a length of about 50 to 100 cm and a thickness of about 5 to 10 cm, and a size (area) and shape (rectangle or round shape) of a reaction vessel to be manufactured and installed about 5 to 10 cm. The water surface difference unit (B) in the unit state is completed by connecting vertically and horizontally in accordance with the unit.

Therefore, the individual blockers (b) of the present invention can be transported in a separate state, respectively, to be assembled and installed in the field according to the reaction tank size or shape of the installation site. Since only the replacement of the bay, there is no need for transportation problems or installation and maintenance.

In addition, preferably, the body 10 of the individual blocker (b) has a lower surface 16 which is convex and inclined upwardly outward so that air bubbles are generated in the water to be treated in the reaction tank, and thus the individual blocker is injured. It is possible to easily exhaust the upper side along the lower surface 16 to the outside of the inclined surface without staying on the lower surface, and the upper surface 18 has the upper surface 18 which is convex in the middle part and inclined downward to the outside. b) Water above (water droplets) is allowed to flow down the reactor along the slope.

Meanwhile, the coupling parts 12 and 14 correspond to the male coupling part 12 of the iron type in which the connection pin insertion hole 13 is formed, and the male coupling part 12, and the connection pin insertion hole ( 13 is formed of a female coupling portion 14 of the yaw type formed with a fixing groove 15 is rotatably fixed to both ends of the connecting pin 20 fitted in, the female coupling portion 14 of both sides Connecting pin fixing bracket 17 is screwed to the outside of the fixing groove (15).

Since the floating surface difference unit B according to the present invention is assembled by the connecting pin 20 so that the rectangular floating individual blocker b has vertical and horizontal fluidity, as shown in FIG. 5. Even if a wave (wave) occurs in the water surface of the reactor 30, each individual blocking body (b) constituting this floating water surface difference group (B) is swung up and down while being in close contact with the water surface. There is no gap between the surface and the water surface difference group (B). Therefore, when applied to an anaerobic tank and anaerobic tank, the influence of oxygen in the atmosphere can be dissolved even on the surface flow caused by aerobic agitation. It is possible to increase the treatment efficiency of the advanced sewage treatment method.

In addition, the present invention is composed of a structure for continuously assembling the individual block (b) vertically and horizontally, irrespective of the structure and size of the plant reaction tank during the construction and operation of the treatment plant, it is possible to install and manage the water surface barrier body, and the injury itself. It is possible to be applied to the method with water level change like SBR type method because it does not need a separate fixing device.

In addition, the present invention, when installed in the aerobic tank in addition to the anaerobic tank or anaerobic tank may increase the efficiency of aeration and maintain the water temperature during the winter and odor prevention and aesthetics of the sewage treatment plant may be improved.

Experimental results for verifying the effects of the present invention as described above are as follows.

First, anoxic and anaerobic conditions prepared for nitrogen and phosphorus removal in advanced sewage treatment plants can be expected to increase efficiency only by completely blocking the effects of dissolved oxygen (DO) as well as oxygen that can be dissolved from the atmosphere. Will be. However, most of the advanced sewage treatment plants are open to the top of the reactor and exposed to contact with the atmosphere. In this case, in order to estimate the effect of increasing the treatment efficiency when reducing the exposure area to the atmosphere, A comparative experiment was conducted on the difference of surface area exposed to.

First, the denitrification rate according to the surface exposure area difference and the demassation change per unit time under the conditions shown in Table 1 was performed.

[Table 1] Change of denitrification rate according to water surface area change in anaerobic reactor

shape Item Narrow surface area (narrow)   Circumference: 18.3cm, Diameter: 6cm, Surface area: 28 cm2 (When 64.4% of the standard surface area is covered) Large surface area Circumference: 30.6cm, Diameter: 10cm, Surface area: 78.5cm2 280%

As can be seen in Table 2, the smaller the surface area, the higher the denitrification rate and the demassation rate per unit time. This is because the amount of oxygen dissolved in the wastewater from the atmosphere is reduced or blocked as the surface area decreases. As a result, such a result can be confirmed through the comparison of the denitrification rate difference for each unit time (see FIG. 6).

[Table 2] Experimental Results

Minutes NO3-N (mg / L) NO3-N removal amount Wide Narrow Wide Narrow 0 4.5 5.0 0 0 15 3.8 4.0 0.7 1.0 (142%) 30 4.0 2.3 0.5 2.0 (560%) 45 2.5 2.0 2.0 3.0 (150%) 60 1.8 1.8 2.8 3.3 (117%) 90 1.3 0.8 3.2 4.2 (131%) 120 0.3 0.0 150 0.0 0.0 180 0.0 0.0

These results can be summarized as a change in the cumulative demass as shown in FIG. 7, and as shown in the graph of FIG. 7, as the water surface area of the anoxic tank which is in contact with the atmosphere is reduced, the denitrification rate in unit time and its Absolute amount was confirmed to change.

In addition, the result of comparing the non-denitrification rate by changing the surface area may be represented as shown in FIG. 8. As can be seen in Figure 8 it can be seen that as the ratio of the surface area of water in contact with the air decreases, the denitrification rate is rapidly increased, and this result is the degree of efficiency decrease according to the upper opening in the anaerobic and anaerobic tank in the existing advanced sewage treatment method Can be more serious than you think.

As described above, in the present invention, since the rectangular floating individual blocker is assembled by the connecting pins to have fluidity in the longitudinal and horizontal directions, even if a wave occurs in the water surface, each individual vehicle forming the floating water surface difference unit Since the group is swung in close contact with the surface of the water, no gaps occur between the surface of the water and the surface of the surface of the surface, thereby minimizing the influence of oxygen in the atmosphere when applied to an anaerobic and anaerobic tanks. It is possible to increase the treatment efficiency of the advanced sewage treatment method, and it is possible to install and manage the water surface difference group regardless of the structure and size of the reactor in the treatment plant. Therefore, it can be applied to methods with fluctuations in water level such as SBR type method, and in addition to anaerobic tank or anaerobic tank If the installation has a useful effect, such as that may give improved efficiency and increased appearance of increased efficiency and prevent odor and a sewage treatment plant in accordance with water temperature maintained during winter.

Claims (5)

A plurality of individual blockers (b) consisting of a rectangular body (10) having floating properties in which coupling parts (12, 14) are formed in all directions are connected to adjacent individual blockers (b) and the coupling parts (12, 14). Highly sewage treatment plant reactor for improving treatment efficiency characterized in that it is rotatably coupled to the fin 20 to maintain a close state while flowing with the water surface in spite of the flow of the fluid in a floating state on the water surface of the reactor Floating surface tea group. The method according to claim 1, The rectangular body (10) is a floating water surface difference unit of the advanced sewage treatment plant for improving the treatment efficiency, characterized in that the middle portion is convex and has a lower surface 16 inclined upwardly outward. The method according to claim 1 or 2, The rectangular body (10) is a floating water surface difference unit of the advanced sewage treatment plant for improving the treatment efficiency, characterized in that the middle portion has a convex upper surface 18 inclined downward. The method according to claim 1 or 2, The inside of the rectangular body (10) is a floating water surface difference unit of the reactor for the advanced sewage treatment plant for improving treatment efficiency, characterized in that the hollow state. The method according to claim 1, The coupling parts 12 and 14 correspond to the male coupling part 12 of the iron type in which the connection pin insertion hole 13 is formed, and corresponds to the male coupling part 12 and the connection pin insertion hole 13. It is composed of a yaw-shaped arm engaging portion 14 is formed with a fixed groove 15 is rotatably fixed to both ends of the connecting pin 20 is inserted into the fixing grooves on both sides of the arm coupling portion 14 (15) Floating water surface difference unit of the advanced sewage treatment plant for improving treatment efficiency, characterized in that the coupling pin fixing bracket 17 is screwed on the outside.

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