JPH05337490A - Device for separating fine solid floating in liquid medium with gas stuck to it - Google Patents

Abstract

PURPOSE:To provide sufficient ability to perform solid-gas-liquid separation and to sharply decrease initial cost and running cost by generating turbulence in a liquid medium by flotation force of gas and installing a solid-gas-liquid separation mechanism for separating and recovering fine solid, liquid medium and gas. CONSTITUTION:In a solid-gas-liquid separation device for separating and removing fine solid having higher density than that of a liquid medium and floating or rising in the liquid medium with gas stuck to it from gas, waste water introduced by a pump 15, etc., from the lower part of the device effectively comes into contact with an anaerobic microorganism in the device and at the same time the biomass of the microorganism rises together with treated water and gas by the gas generated by the biodegradation of organic substances. And the biomass, treated water and gas are separated by an upper solid-gas-liquid separation plates 1, 3 and only the treated water is discharged outside the system and the gas is recovered by a gas holder 10 in the upper part and the biomass is circulated through the lower part of the device by the turbulence flowing downward in the device, permitting the anaerobic treatment of the desired waste to be effectively performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating fine floating solids by adhering gas in a liquid medium. More specifically, for example, in a wastewater treatment reactor, wastewater is treated with ion exchange resin, activated carbon, etc. When adsorbing or decomposing impurities or harmful substances in wastewater by contacting with the carrier or the flocs of microorganisms, these are adsorbed or attached to the gas generated by the reaction etc. and float, float, and flow out from the reactor. The present invention relates to a device for separating fine solids from which a gas adheres and floats in a liquid medium used to prevent the occurrence of the above.

[0002]

2. Description of the Related Art For example, as a method for treating organic wastewater, there is an upflow anaerobic sludge blanket method using anaerobic microorganisms that are self-granulated into particles. The wastewater is biodegraded by contact with the granulated anaerobic microorganisms, and the gas generated at that time adheres to the granulated anaerobic microorganisms and floats on them, further decomposing the organic matter in the wastewater in the process. However, a continuous gas-liquid separator for purifying wastewater is known.

Conventionally, forcible separation of solids by means of expensive filters has been used in this type of solid-gas separation apparatus. Among them, as a solid-gas liquid separation mechanism of an anaerobic microbial treatment apparatus for wastewater, as shown in FIGS. 1 to 4, various shapes such as a relatively simple separation structure to a complicated structure are exhibited. There is. As shown by the arrow part, these are the flows of the wastewater by the upward flow, the anaerobic microorganisms inside the device and the wastewater come into contact with each other, and the bacteria are levitated by the gas generated together with the decomposition of the organic matter. The solid-gas separation mechanism in the upper part of the device intends to separate and collect the bacterial cells, the treated water and the gas, respectively.

That is, in the example of FIG. 1, the wastewater flowing in from the lower part comes into contact with the anaerobic microorganism group at the lower part of the apparatus to decompose organic matter, and the gas generated in the process causes the bacterial cells and gas to float. However, the gas is collected in the central part A of the device by the solid-gas liquid separation mechanism in the upper part and collected by B, while the bacterial cells descend. In addition, the treated water becomes clear water at the C part, and the outer circumference D
More out of the system. In the example of FIG. 2, the wastewater flowing from the lower part comes into contact with the anaerobic microorganisms group at the lower part of the device to decompose organic matter, and the gas generated in the process causes the bacterial cells and gas to float, but The gas is collected by the gas-liquid separation mechanism around the device E and collected by F, while the bacterial cells descend. In addition, the treated water becomes clear water in the G portion and is discharged from the system from the outer circumference H. The example of FIG. 3 is an enlarged version of the example of FIG. That is, the same treatment as in FIG. 1 was performed, and the floating bacterial cells and gas were collected by the solid-liquid separation mechanism in the upper part of the apparatus, and the gas was collected by J, while the bacterial cells descended. Further, the treated water becomes clear water at the K portion and is discharged from the system from the outer periphery L. The example of FIG. 4 is an enlarged version of the example of FIG. That is, the same treatment as in FIG. 2 is performed, and the floating bacterial cells and gas are collected in the M portion of the apparatus by the solid-liquid separation mechanism in the upper part and recovered by N, while the bacterial cells descend. In addition, the treated water becomes clear water in the O portion and flows out of the system from the outer periphery P.

[0005]

However, in the conventional solid separation apparatus having a solid-gas / liquid separation mechanism, a relatively simple separation structure can sufficiently separate cells, treated water and gas. However, since the bacterial cells often mix with the treated water and flow out, there is a problem that the amount of waste water is limited to a certain amount, so that the treated amount is limited or the device capacity is increased. Further, in the case of a complicated separation structure, there are problems that it takes time to manufacture and the initial cost is high.

Therefore, an object of the present invention is to provide a device which solves the above-mentioned problems of the prior art, has a sufficient solid-gas / liquid separation ability, and has a simple structure and can keep the initial cost low. To do.

[0007]

According to the present invention, in a liquid medium, a fine solid having a specific gravity higher than that of the liquid medium and floating or floating in the liquid medium while adhering gas is gas. In a separation device that separates and removes more, a turbulent flow is generated in the liquid medium inside the device by utilizing the floating force of the gas, and fine solids, liquid medium, and gas are separated and recovered, respectively. An apparatus for separating fine solids in a liquid medium having a separation mechanism is provided.

The structure which characterizes the solid-gas liquid separation device according to the present invention is such that the mounting angle and position of the solid-liquid separation plate 1, the turbulent flow assisting projection 2 on the lower side of the mounting of the solid-gas liquid separation plate 1, and other solids. A gas-liquid separation plate 3, a triangular gas collection auxiliary plate 4, and a gas circulation pipe 5 used when the amount of gas is small and turbulence is unlikely to occur.

Here, the solid-gas separation plate 1 (for example, a plate made of stainless steel) is inclined (preferably at an angle of 45 to 55 °) above the central portion of the liquid medium in the solid-liquid separation device. Are appropriately fixed and installed with appropriate gaps between the gas collection auxiliary plate 4 and the liquid medium free surface provided on the wall surface near the middle portion in the height direction. In addition, solid-liquid separation plate 1
A plurality of turbulent flow assisting projections 2 (for example, a length of 50
(-150 mm protrusion) is provided, and solids attached with gas rising from below collide with this to generate a downward flow as shown by the arrow in FIG. 5 so that solids are collected downward. The second solid-gas liquid separation plate 3 extends, for example, part of the gas holder 10 into the liquid medium to a depth sufficiently deeper than the upper gap 6 of the first solid-gas liquid separation plate 3 and flows out from the gap 6. The solids are then collided and separated from the gas so that the solids are returned downwards through the gap 7.

[0010]

In the solid-gas separation apparatus according to the present invention, waste water introduced by a pump or the like from the lower part of the apparatus is efficiently contacted with anaerobic microorganisms in the apparatus, and at the same time, microbial cells are generated by gas generated by biodegradation of organic matter. Rises along with the treated water and gas, the cells, treated water and gas are separated by the upper solid-gas liquid separation plates 1 and 3, only the treated water flows out of the system, and the gas is recovered in the upper gas holder 10. Since the microbial cells are circulated to the lower part of the device in a turbulent flow that descends inside the device, the desired anaerobic treatment of wastewater can be efficiently performed.

[0011]

FIG. 2 is a view showing an example of an apparatus for separating fine solids having a gas-liquid separation mechanism according to the present invention, in which a gas adheres and floats in a liquid medium. A preferred embodiment of the present invention will be described below using the apparatus shown in FIG. 2, but it goes without saying that the scope of the present invention is not limited to this embodiment.

That is, the solid-gas separation plate 1 has an installation angle of 50 ° (usually 45 to 55 °) with respect to the horizontal plane, and its upper portion is approximately 100 mm below the water surface (usually 50 to 150 mm), and the liquid movement gap 6 On the other hand, the lower part has a space 7 with the triangular gas collecting auxiliary plate 4.
Is set to about 200 mm (usually 150 to 250 mm), and several turbulent flow auxiliary projections 2 are provided below the solid-gas liquid separation plate 1 to create turbulence while creating a water flow in the direction of the solid line arrow in the figure. A flow can be generated, and solid-liquid separation can be performed very efficiently. Further, by making a part of the flow of water from the gap 6, it functions to prevent the bacterial cells, the treated water and the gas from flowing out of the system directly through the gap 7 through the direction of the broken line arrow. The bacterial cells and the treated water that have flowed from a part of the gap 6 hit another solid-gas / liquid separation plate 3, and only the bacterial cells pass through the gap 7 and settle again in the lower part of the apparatus. It is necessary that the separating plate 3 projects into the liquid below the gap 6. In this way, the treated water is completely subjected to solid-liquid separation in the supernatant 8 on the upper right side of the figure, and the treated water flows out of the system through the gutter 9. On the other hand, the fungus body descends in the tank as shown by a solid arrow and smoothly circulates in the tank, and the wastewater inflow pump 15 always maintains efficient contact with the wastewater introduced from the wastewater inflow pipe 14.

In the initial stage, the amount of gas generated is small,
If rising turbulence is unlikely to occur and bacterial cells flow out, the generated gas collected by the gas holder 10 or the oxygen-free gas (nitrogen, etc.) 11 introduced from outside the system is piped using the pump 12. A flow can be created by venting through the bottom of the device through 5. When operating without circulating the gas, the generated gas is diffused from the system 13 to the outside of the system or is led to the post-treatment section.

[0014]

As described above, according to the present invention, the solid-gas separation mechanism having an extremely simple structure has sufficient ability in solid-liquid separation, and can significantly reduce the initial cost. it can. Further, since the present mechanism 16 can be installed and used in a part of the wastewater treatment reactor, for example, as shown by the hatched portions in FIGS. 5, 6 and 7, the running cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a view showing an example of a solid-liquid separation mechanism of a conventional wastewater anaerobic microbial treatment apparatus.

FIG. 2 is a diagram showing another example of a solid-liquid separation mechanism of a conventional wastewater anaerobic microbial treatment apparatus.

FIG. 3 is a view showing still another example of the solid-gas liquid separation mechanism of the conventional wastewater anaerobic microbial treatment apparatus.

FIG. 4 is a view showing still another example of a solid-liquid separation mechanism of a conventional wastewater anaerobic microbial treatment apparatus.

FIG. 5 is a schematic view showing an example of an apparatus for separating fine solids to which gas is attached and suspended in a liquid medium provided with a solid-liquid separation mechanism according to the present invention.

FIG. 6 is a plan view showing an example of the arrangement of the solid-gas separation mechanism of the present invention in a wastewater treatment reactor.

FIG. 7 is a plan view showing another example of arrangement of the solid-gas liquid separation mechanism of the present invention in a wastewater treatment reactor.

FIG. 8 is a plan view showing still another example of arrangement of the solid-gas separation mechanism of the present invention in a wastewater treatment reactor.

[Explanation of symbols]

 1 ... Solid-gas separation plate 2 ... Turbulence assisting projection plate 3 ... Solid-gas separation plate 4 ... Gas collection auxiliary plate 5 ... Gas circulation pipe 6 ... Liquid moving gap 7 ... Solid-gas separation plate and gas collection auxiliary Gap between the plates 8 ... Supernatant 9 ... Treated water outflow gutter 10 ... Gas holder 11 ... Introduced gas 12 ... Pump 13 ... Exhaust gas 14 ... Wastewater inflow pipe 15 ... Wastewater inflow pump 16 ... Solid-liquid separation mechanism of the present invention

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B01D 21/24 A

Claims (1)

[Claims] 1. A separation device for separating and removing from a gas a fine solid having a specific gravity higher than that of the liquid medium and floating and floating in the liquid medium while adhering the gas. A turbulent flow is generated in the liquid medium in the device by utilizing the floating force of the liquid to separate and collect fine solids, liquid medium and gas, respectively. Solid separation device.