JPS635838Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a biological denitrification tank for nitrifying and denitrifying human waste, sewage, and other organic wastewater using microorganisms.

In general, this kind of biological nitrification and denitrification treatment of organic wastewater reduces the nitrogen content (hereinafter abbreviated as _NH3 ) of wastewater.
is nitrified under aerobic conditions to produce NOx (NO ₂ or/and
_NOx ) is then reduced and decomposed (denitrified) to _N2 gas under anaerobic conditions and released from the water. Therefore, the denitrification tank for this treatment has a sealed structure to maintain anaerobic conditions.
_N2 gas is released from a water-sealed gas release section.

The gas discharge section provided in the conventional denitrification tank is the first
As shown in the figure, a gas discharge pipe B connected to the top surface of the denitrification tank A is placed in communication with a gas discharge tower D provided in a water seal storage tank C, and a gas cleaning mechanism E is installed in the gas discharge tower D. In some cases, the gas release tower D has a complicated structure in which water droplets are brought into contact with each other in a countercurrent direction in order to remove the foul-smelling gas mixed in the N ₂ gas. However, when such a gas discharge section generates bubbles in the denitrification tank A, the bubbles rise to the gas discharge tower D and overflow onto the water seal tank C, contaminating the top of the denitrification tank A significantly. Further, as the gas discharge pipe B is repeatedly blocked by bubbles and discharged inward, the internal pressure of the denitrification tank A increases and decreases, and the liquid level changes.
Therefore, the mixed liquid flowing into the sedimentation tank becomes a pulsating flow, and the water load on the sedimentation tank changes, impairing its function.

The structure was complicated, so construction was complicated and equipment costs were high.

The purpose of this invention is to eliminate these conventional drawbacks, and it is possible to perform nitrification and denitrification treatment efficiently by accurately and safely releasing gas, and it is also easy to dispose of bubbles that occur in the denitrification tank. An object of the present invention is to provide a biological treatment device with a simple configuration and low cost, which can maintain the functions of a sedimentation tank well.

The present invention provides a biological nitrification and denitrification device equipped with a denitrification tank and an aerobic tank, in which a hollow structure for discharging surplus gas is attached to the side wall of the gas phase section of the denitrification tank, and the hollow structure This biological treatment device is characterized in that the tip of the body is immersed in the liquid of a water-sealed water storage tank provided in the aerobic tank.

The present invention will be explained based on FIGS. 2 to 8.
In FIGS. 2 to 6 and 8, the tank is divided into two tanks by a partition wall 4, one of which is a nitrification tank 1 which is an aerobic tank, and the other is a denitrification tank 2 which is an anaerobic tank.
The denitrification tank 2 is isolated from the atmosphere by a lid to maintain an anaerobic state, and the N ₂ generated in the denitrification tank 2 is
A gas discharge tube 3 made of a hollow structure is provided as a gas discharge section for discharging gas, bubbles, etc. and is opened downward in a continuous manner on the side wall of the gas phase section, and the open end of the gas discharge tube 3 is a gas discharge port 3'. is opened into the liquid of the water seal water storage tank 5. In FIGS. 2 to 5, the water seal water storage tank 5 is formed at a corner of the nitrification tank 1 with the partition wall 4 and the tank wall as sides (see FIG. 8).
In Fig. 2, the overflowing water seal water is provided in the nitrification tank 1 at a height where it flows into the nitrification tank 1, and in Fig. 3, it is submerged in the liquid in the nitrification tank 1 and the liquid is used as water seal water. It is configured.

In Fig. 4, it is installed above the liquid level in the nitrification tank 1, but in either case, this is a relative installation height that may occur due to fluctuations in the liquid level in the nitrification tank 1, and there is no noticeable difference in operation and effect. However, the height of the gas discharge port 3', which is the tip of the gas discharge cylinder 3, is set to be equal to the liquid level on the denitrification tank 2 side of the water seal water storage tank 5, and the height of the gas discharge port 3' and the water seal water storage tank 5 are The height of the atmospheric side wall of the storage tank 5,
Adjustment of water seal water volume, etc. The difference in height between the liquid level on the denitrification tank 2 side of the water seal water storage tank 5 and the liquid level on the atmospheric side should be 300 mm or less, preferably 50 to 100 mm. It is effective in preventing a decrease in the effective volume caused by a drop in the liquid level due to an increase in internal pressure in the denitrification tank 2.

Fig. 6 shows an example in which the water-sealed water storage tank 5 is placed above the liquid level of the nitrification tank 1 using appropriate supporting means, and Fig. 7 shows an example in which it is placed between two adjacent tanks, the nitrification tank 1 and the denitrification tank 2. .

The gas discharge cylinder 3 may have a lid or a vertical upper part of the partition wall 4 as a cylinder wall as shown in FIGS. 2 to 5, or a cylinder body as shown in FIGS. 6 and 7. However, in any case, it is preferable that the opening of the gas discharge tube 3 in the tank wall be provided in the side wall part including the middle height part of the gas phase part, and the inner diameter should be 100 mm or more, preferably about 200 to 1000 mm. It is effective to make the gap between the bottom plate of the water seal water storage tank 5 and the gas discharge port 3' at least 100 mm or more to prevent the gas discharge path from being blocked by generated bubbles.

The water to be treated in the nitrification tank 1 and the denitrification tank 2, tap water, etc. are used as the water to be held in the water to the water storage tank 5.

In the figure, 6 is foam, 7 is a communication port, 8 is an aeration blower,
9 is an aeration pipe, 10 is a gas pipe for stirring inside the denitrification tank 2, and 11 is a gas suction port, which is installed above the gas discharge tube 3 that opens into the denitrification tank 2 to prevent bubbles from being sucked in. There is. 12 is a stirring blower, 1
3 is a gas ejection pipe, 14 is a water seal water supply path, 15 is a pump, and 16 is a communication pipe.

The flow order of the treated liquid in the two tanks described above is adopted in a biological nitrification and denitrification device, for example, from the first denitrification tank to the nitrification tank, from the nitrification tank to the denitrification tank, and so on.
Alternatively, the aerobic tank may be a reaeration tank into which the denitrified liquid flows.

Furthermore, when the water seal water storage tank is installed separately from the aerobic tank, or when the anaerobic tank is installed independently, the gas discharge tube is placed downward from the side wall and the tip is placed in the water. The sealing structure prevents an increase in internal pressure in the tank due to blockage caused by bubbles, and allows gas and bubbles to be smoothly released.

With this invention, it is possible to provide a simple and inexpensive device that can smoothly eliminate nitrogen gas and bubbles generated in a denitrification tank to perform biological treatment efficiently and in a stable state, and has great practical effects. It has the following.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional example, Fig. 2 is a longitudinal sectional view showing an embodiment of the present invention, Figs. 3 and 4 are longitudinal sectional views of other embodiments, and Fig. 5 is a plan view thereof. , FIG. 6 and FIG. 7 are longitudinal cross-sectional views of a part of still another embodiment, and FIG. 8 is a partial perspective view of another embodiment. 1... Nitrification tank, 2... Denitrification tank, 3... Gas discharge tube, 4... Partition wall, 5... Water seal water storage tank.

Claims (1)

[Claims for Utility Model Registration] 1. In a biological nitrification and denitrification device equipped with a denitrification tank and an aerobic tank, the gas discharge part of the denitrification tank is connected to a water-sealed water storage tank provided in the aerobic tank. A biological treatment device that is submerged under the water surface. 2. A utility model registration claim in which the gas discharge part is a hollow structure connected to the side wall of the gas phase part of the denitrification tank, and the tip of the hollow structure is immersed under the water surface of the water seal water storage tank. Biological treatment equipment according to scope 1. 3. The biological treatment apparatus according to claim 1 or 2, wherein the water seal water storage tank is a water tank arranged below the water surface so as to be in contact with the liquid in the aerobic tank. 4. The biological treatment apparatus according to claim 1 or 2, wherein the sealed water storage tank is a water tank placed above the water surface of the aerobic tank. 5. Claims 1, 2, or 4 of the registered utility model, wherein the water seal water storage tank is equipped with a water seal water supply channel into which liquid from the denitrification tank or aerobic tank can be poured. biological treatment equipment. 6 Claims 2, 3, and 4 for utility model registration in which the aerobic tank is a nitrification tank or a reaeration tank
The biological treatment device according to item 1 or 5.