KR20010036351A - Wastewater treatment plant for disintegration and separation of pollutants - Google Patents

Abstract

PURPOSE: An aeration tank having a settling module therein is provided to conduct aeration and liquid/solid separation in one reactor. CONSTITUTION: The aeration tank (1) consists of a fine bubble tubular diffuser (2); at least a pair of parallel settling plates (3) which are composed of two guide plates (31, 32) for settling solid particles; a microbial media (4) which is installed at the bottom part of guide plates for immobilizing aerobic microorganisms. Before treated wastewater flows out from the aeration tank, it passes through inclined plates (5, 51). Each guide plate (31, 32) is installed at 5 centimeter intervals.

Description

Wastewater treatment plant for disintegration and separation of pollutants {Wastewater treatment plant for disintegration and separation of pollutants}

The present invention enables the efficient supply of oxygen in the biological treatment of wastewater when biological treatment of contaminants such as wastewater and wastewater in a single reactor continuously, and an apparatus capable of efficiently separating treated water and sludge. In addition to this, the fluid flows appropriately, and at the same time, the fluid inducing means separates the wastewater from the treated water and sludge, thereby increasing the oxygen dissolution rate, promoting the organic removal rate, and inducing the sludge separation. To provide a biological device of wastewater.

Water treatment is a series of operations that convert contaminated substances in water into substances stabilized by microorganisms or chemical oxidation or reduction. Depending on the nature of the waste water, the organic matter contained therein can be stabilized in various ways. However, most water treatments are very slow and unstable because they depend on the rate of decomposition of microorganisms in nature. In particular, this problem is more serious in the case of high concentrations of hardly degradable wastewater. The key to such wastewater treatment is to supply organics more effectively as a source of free or combined oxygen and carbon as an energy source, how to properly maintain microbial conditions, and how to separate decomposed solids after treatment. It's a room.

Until now, only the principle of such a condition has been emphasized, but it is not enough to develop a device suitable for it in reality. That is, it has been dominated by general trends such as aerobic treatment for low concentration wastewater treatment and anaerobic treatment for high concentration wastewater treatment. This is because in the case of high concentration wastewater treatment, the smooth oxygen supply and the simultaneous separation of hydrodynamic solids were not easy. For example, livestock wastewater and leachate have been stored for a long time after the generation of wastewater, and since most of the wastewater is anaerobic digested, only high concentrations make it difficult to say that it is an appropriate treatment method. Therefore, it is not practical to go through the anaerobic digestion process simply because of its high concentration. One of the biggest reasons for relying on anaerobic digestion for high concentrations of wastewater treatment is the difficulty in maintaining adequate dissolved oxygen for aerobics. In order to cope with this, the pure oxygen aeration method and the pressurized dissolved oxygen method are applied. However, the cost of pure oxygen supply and the sludge closure due to the pressurization have been facilitated in the laboratory, but the field application is considered difficult.

The present inventors can increase the solubility of the material by modifying the flow of air or fluid, and can enhance the contact effect between the microorganism and the substrate by increasing the stirring effect.

In addition, since the supply of dissolved oxygen by simple aeration is dissolved in the process of air injected into the reactor into the water in the aeration tank, the air floatation time is short and the solubility is low because the gas-liquid membrane, which is the contact surface between the air and the waste water, is injured. In addition, since a large amount of bubbles are exposed on the surface of the water, a large amount of bubbles are generated. In addition, when agitation is performed for biological denitrification, most of the sludge rises to the outlet in the stirring process, and it is impossible to discharge the treated water at the same time as the agitation. Therefore, the supernatant is discharged after sedimentation, but the nitrogen gas degassed in the sedimentation process is continuously released from the sludge, thus inhibiting the sludge sedimentation. Therefore, the most problematic problem in the existing water treatment process is the separation of the gas depletion-promoting solid solution in the water by supplying and mixing oxygen, and when such a problem is not solved, the existing biological treatment method is limited.

First, the present invention aims to increase the contact between the substrate and the microorganism in order to effectively biologically treat high concentration organic wastewater, and to sufficiently supply oxygen required by the microorganism. Second, by maintaining a low speed stirring in the concentration or denitrification process of the sludge, there is another purpose to maintain the microbial concentration sufficiently and to allow the supernatant to flow out. These two functions can be realized by installing a fluid guide plate for fluid flow, power of the rotating body, and flow change of the fluid.

1 is a schematic view of a wastewater treatment apparatus for inducing decomposition and separation in a single reactor as an exemplary embodiment of the present invention.

2 is a block diagram of a wastewater treatment apparatus for inducing decomposition and separation in a single reactor as another exemplary embodiment of the present invention.

FIG. 3 is an excerpt perspective view of the fan inclined guide plates 30 in the embodiment shown in FIG.

4 is an exploded plan view of the fan inclined guide plate 30 in the embodiment shown in FIG.

FIG. 5 is an exploded view of an inside of a reaction tank for explaining a state where the fan inclined guide plates 30 are installed in the inner circumferential wall of the reaction tank 10 in the embodiment shown in FIG. 2.

<Explanation of symbols for main parts of drawing>

1, 10 ... reactor

2 ........ The diffuser

20 ....... Mountain Board

3 ........ Slope Induction Plate

30 ....... Detective induction plate

31, 32 .... Sloped

300 ........

301 ........ stirring

4, 40 ...... carrier

5, 51 ..... Sedimentation Induction Plate

6 .......... treated water inlet

7 .......... Upper outlet

8 .......... Sediment outlet

The present invention is to provide an apparatus that can effectively supply oxygen in the biological treatment of various contaminants such as waste water and waste water, and can efficiently separate the treated water and sludge. The apparatus of the invention comprises a carrier formed on the air contacting surface of the reactor, the aeration device, the fluid guide means, and the fluid guide means.

As an embodiment of the present invention as such an embodiment of the laboratory scale is shown by the accompanying drawings. However, the following examples should not be understood as limiting the scope of the present invention. That is, in the accompanying drawings, for the convenience of explanation of the present invention, limited embodiments used in the experiments of the present invention are shown.

In the accompanying drawings, Figure 1,

Reactor 1 is composed of a rectangular cylinder,

The aeration device is composed of a diffuser (散 氣管; 2) installed in the upper vent,

The fluid guide means is composed of one or more inclined guide plate (3) having a pair of two or more separated inclined plates (31, 32) is installed,

The embodiment in which the carrier 4 is formed on the bottom of each inclined plate 31, 32 is shown.

In this embodiment, the sedimentation induction plates 5 and 51 are provided on the upper part of the reaction tank 1, and the treated water inlet 6, the supernatant water outlet 7, and the sediment outlet 8 are provided. Two inclined plates 31 and 32 constituting each inclined guide plate 3 are provided at intervals of 5 cm or more. Each of the inclined plates 31 and 32 may be provided at a larger interval, but when the interval is wide, the processing apparatus must be large. It is preferable that the inclined plates 31 and 32 constituting each inclined guide plate 3 have an inclination angle of 10 to 80 degrees. If the inclination of the inclined plate (31, 32) is urgent, the flow of air blown out from the diffuser (2) is faster and thus the flow rate of the treated water is faster.

The carrier 4 formed on the bottom of each of the inclined plates 31 and 32 is formed by attaching a sponge carrier or other amorphous carrier, thereby growing microorganisms.

And, in the accompanying drawings, Figure 2,

Reactor 10 is composed of a cylindrical body,

The aeration device is composed of an acid substrate (散 氣管) 20, the ventilation hole is installed at the top,

The fluid guide means is composed of a fan-shaped inclined guide plate 30 and a stirring blade 301 installed on the inner wall of the reaction tank 10, the fan-shaped inclined guide plate 30 is fixed to the inner wall of the reactor 10, the outer peripheral surface So it is installed so as to extend toward the center of the reaction tank 10, each fan inclined guide plate 30 is installed to be inclined along the circumferential direction, the through hole 300 in the central portion of each fan inclined guide plate 30 Is formed is configured to form the aperture of the camera, the shaft of the stirring blade 301 is installed through the through hole 300,

The bottom surface of each scalloped plate 30 is shown in the embodiment in which the carrier 40 is installed.

In this embodiment as well, the treatment tank inlet 6, the supernatant water outlet 7 and the sediment outlet 8 are, of course, provided. Each fan-shaped inclined plate 30 is formed such that the leading end (a) of the fan-shaped sloped plate 30 on one side and the rear end (b) of the adjacent other fan-shaped sloped guide plate 30 have an interval of 5 cm or more. Each fan-shaped inclination guide plate 30 preferably has an inclination angle of 10 to 70 degrees.

2 is an embodiment in which only one layer of the fan inclined guide plate 30 is installed, but the fan inclined guide plate 30 may be installed in multiple layers.

The carrier 40 formed on the bottom surface of each scalloped induction plate 30 is formed by attaching a sponge carrier or other amorphous carrier, thereby growing microorganisms.

In the present invention configured as described above, oxygen is supplied to the wastewater introduced through the treated water inlet 6 by the diffuser 2 or the acid substrate 20, and the aerated air or the stirring blade 301 Carriers 4 and 40 in which the flow of the wastewater is guided to the inclined guide plate 3 or the flat fan inclined plate 30, and the aerated air is installed on the bottom surface of the inclined guide plate 3 or the fan inclined guide plate 30. At the same time, the inclined guide plate 3 or the fan-shaped slant guide plate 30 acts to separate the supernatant and the sludge which is a relatively high specific gravity, thereby increasing the separation effect of the supernatant and the sediment.

In particular, the apparatus of the present invention, by installing the carrier (4, 40) in the aeration path of the aeration air, the air discharged from the lower diffuser can move to the upper portion of the carrier attached to the oxygen in the air carrier (4 , 40) to intensively deliver oxygen to the microorganisms present in the air, and the air passing through the carriers 4 and 40 acts to release the sludge that is excessively attached to the carriers 4 and 40 so that the sludge is supported by the carrier ( 4, 40) Do not disturb the contact of air and wastewater. Thus, by minimizing the thickness of the gas-liquid film existing between the gas and the liquid by the interaction between the carrier and the air bubble, oxygen is transferred from the air to the microorganism attached to the carrier, and carbon dioxide, a by-product of the microorganism, is mutually transferred to the air bubble. To maximize the metabolic activity of the microorganisms on the surface of the carrier.

In the embodiment shown in FIG. 2, air is introduced into the lower acid substrate 20 to induce aerobic treatment, and the stirring blade 301 is rotated at 10 to 120 RPM to supply stirring and oxygen. Will improve the effect. Attached drawings in which four or more fan inclined guide plates 30 are installed. In the embodiment of FIG. 2, when the stirring blade 301 is rotated at a speed of 100 RPM or more, the fluid flow rate is caused by the flat inclined guide plate 30. And the direction is different from the top and bottom of the fan-shaped inclination guide plate 30, respectively, the stirring efficiency becomes very high. On the other hand, in the case of slowing down the rotational speed of the fan-shaped inclination guide plate 30, the liquid and solids were found to move differently due to the specific gravity difference. Therefore, by using this phenomenon, liquid and sludge can be easily separated and concentrated. Especially in the case of large thickeners, this phenomenon can be accelerated for the rotational speed of the screpa for withdrawing the thickened sludge.

An embodiment in which the water treatment is performed using the apparatus of the present invention configured as described above, in particular of the accompanying drawings, is as follows.

The leachate generated in the leachate treatment plant was degassed by the degassing apparatus, and then introduced into the reactor 1 through the treated water inlet 6. The COD of the leachate introduced was 22,500 mg / L. As a result of the two-day biological treatment experiment of this leachate by general activated sludge method, the COD was reduced to 2,100 mg / L, but the biological treatment by the apparatus of the present invention reduced the COD to 530 mg / L. . On the other hand, even in flocculant or simple concentration, the concentrated sludge water content was lower than 2/3 of the sludge produced by conventional concentration. In order to compare the results of the present invention with the conventional aerobic treatment results are shown in a diagram below.

Eh home Sludge thickening COD of treated water by conventional activated sludge method COD of treated water according to the present invention Existing Treatment Treatment by the device of the present invention Existing Treatment Treatment by the device of the present invention FeCl ₃ Usage Concentrated Sludge Content FeCl ₃ Usage Concentrated Sludge Content Concentrated Sludge Water Content Concentrated Sludge Water Content 2,100 mg / L 530 mg / L 1,500 mg / L 98% 700 mg / L 96% 98.5% 97%

As shown in the above table, the leachate subjected to biological treatment and sludge concentration treatment by the apparatus of the present invention was found to be more efficient than the conventional treatment method. Conventional water treatment systems are classified into continuous and batch reactors, but this system is continuous and can simultaneously induce decomposition and precipitation, so that it can cope effectively with organic loads as well as the existing continuous batch system that induces decomposition and separation in a single reactor. It can be said to be a water treatment device that can maintain the advantages of the reactor to the maximum to ensure treatment efficiency and economics at the same time.

Claims (3)

A waste water treatment apparatus for decomposing and separating contaminants, comprising a reaction tank, an aeration device, a fluid guide means, and a carrier provided on an air contacting surface of the fluid guide means. The method of claim 1, Reactor 1 is composed of a rectangular cylinder, The aeration device is composed of a diffuser (散 氣管; 2) installed in the upper vent, The fluid guide means is composed of one or more inclined guide plate (3) having a pair of two or more separated inclined plates (31, 32) is installed, Waste water treatment apparatus for decomposition and separation of pollutants, characterized in that the carrier (4) is provided on the bottom of each inclined plate (31, 32). The method of claim 1, Reactor 10 is composed of a cylindrical body, The aeration device is composed of an acid substrate (散 氣管) 20, the ventilation hole is installed at the top, The fluid guide means is composed of a fan-shaped inclined guide plate 30 and a stirring blade 301 installed on the inner wall of the reaction tank 10, the fan-shaped inclined guide plate 30 is fixed to the inner wall of the reactor 10, the outer peripheral surface Therefore, it is installed to extend toward the center of the reaction tank 10, each fan-shaped inclined guide plate 30 is installed to be inclined along the circumferential direction and the through-hole 300 is formed in the center to form the aperture of the camera And, the shaft of the stirring blade 301 is installed through the through hole 300, Wastewater treatment apparatus for decomposition and separation of contaminants, characterized in that the amorphous carrier 40 is installed on the bottom of each fan-shaped slope plate (30).