JPS6010715Y2 - Fixed bed contact oxidation tank - Google Patents

Description

[Detailed description of the invention] This invention is based on filling a tank with a layer of packing material on which aerobic microorganisms have grown, and allowing the water to be treated containing BOD to rise in the layer of the packing material along with the air. This relates to the improvement of a fixed-bed catalytic oxidation tank that removes BOD in the water to be treated through microbial treatment, and includes a double-tube structure of a water supply pipe and an air supply pipe below the filler layer. By directly burying each, the purpose is to supply treated water and air evenly to the filler layer and to reduce construction costs.

A conventional fixed-bed catalytic oxidation tank has a supporting screen of filler at the bottom of the tank, a layer of filler is formed above the support screen, and an inflow pipe for water to be treated is attached to the tank wall below the support screen. It has a structure in which an air inflow pipe passes through the tank wall below the support screen, and an air supply pipe with multiple holes is connected to the air inflow pipe in the tank. At the same time as the treated water flows in through the inflow pipe, air flows in through the air inflow pipe and from the air supply pipe.

However, in such conventional tanks, if a filler with a high specific gravity, such as gravel, is used as the filler, and the cross-sectional area of the tank is large, the support screen for the filler and its support must have great strength. If this is required, the structure of the supporting mechanism for the waist filler becomes complicated, which has the disadvantage of requiring a long period of time to construct and increasing the construction cost.

The present invention compensates for these shortcomings in conventional fixed bed catalytic oxidation tanks by incorporating an outer tube with many small holes and an inner tube under the packing material layer on which aerobic microorganisms have grown. Directly burying a treated water supply pipe and an air supply pipe each having a double pipe structure consisting of a pipe, and supplying the treated water and air from the inner pipe of the double pipe to the filler layer in an upward flow. The present invention relates to a fixed bed catalytic oxidation tank characterized by:

An example of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the oxidation tank of the present invention, and FIG. 2 is a side view of FIG. 1.

In the figure, 1 is a fixed bed contact oxidation tank having a layer 2 of a filler material on whose surface aerobic microorganisms are grown, and for example, gravel, rasp rings, etc. are used as the filler material.

In the lower part of the layer 2 of the filling material, one air supply pipe 5 or a plurality of air supply pipes 5 are installed on the same horizontal plane, at appropriate intervals, for example, 4.
They are evenly arranged in the lower part of the tank 1 at intervals of 00 to 150-.

In addition, one or more water supply pipes 4 to be treated are placed on a horizontal plane slightly above the air supply v5 in the same way as the air supply pipe 5.
They are arranged at appropriate intervals, for example, 400 to 200 oTrrIn.

In addition, the water to be treated inflow pipe 3 is connected to the water supply pipe 4 to be treated, and the air supply pipe 5 and the air generator 7 are connected to each other by an air inflow pipe 6 shaped like an inverted U-shaped tube. Connect water pipe 8.

In treating the water to be treated in such a fixed bed contact oxidation tank 1, the water to be treated is uniformly supplied into the fixed bed contact oxidation tank 1 from the water supply pipe 4 through the water inflow pipe 3, At the same time, air is pressurized by the air generator 7, and the pressurized air is evenly supplied into the tank 1 from the air supply pipe 5 via the air inflow pipe 6, and is applied to the filler layer 2 to be treated. The water and air are raised and the treated water is taken out from the treated water pipe 8.

If such treatment is continued for a long time, the microorganisms grown on the surface of the filler will enlarge and the layer 2 of the filler will become clogged. 4 and 5, the filling material is backwashed by flowing upward at a higher flow rate than when water is flowing.

In addition, when the treated water supply v4 and the air supply pipe 5 are arranged alternately in the same vertical direction without overlapping each other as shown in Fig. 2, the air inflow pipe 6 and the treated water supply pipe 4 are branched. Prior to backwashing as described above, the flow of water to be treated is stopped, and air is ventilated in an upward flow from the water supply pipe 4 through the air inflow pipe 6 and branch pipe 9. - By performing scrubbing with air and then performing the above-mentioned backwashing, it is possible to remove the clogging of the water supply pipe 4 to be treated, and since the air supply position is changed, the air inside the layer 2 of the filler material can be removed. Since the flow path moves, it is possible to prevent the formation of a dead space through which air cannot pass due to the fixation of the air flow path, thereby improving the cleaning effect.

Note that when performing scrubbing by venting air from the water supply pipe 4 to be treated, air may also be supplied from the air supply pipe 5 at the same time, or the supply of air from the air supply pipe 5 may be stopped. .

Next, the treated water supply pipe 4 and the air supply pipe 5 used in the present invention will be explained below.

The treated water supply pipe 4 and air supply pipe 5 used in the present invention are double pipes 10 consisting of an outer pipe 13 and an inner pipe 11 having a large number of small holes as shown in the vertical cross-sectional view of FIG. .

By making the treated water supply pipe 4 and the air supply pipe 5 into double pipes 10 in this way, even if the Aze supply pipe is buried directly in the layer of filler, the Aze supply pipe will not be clogged. This is less likely to occur and the water and air to be treated can be distributed more evenly into the layers of filler.

The double pipe 10 includes an inner pipe 11 and an outer pipe 13 that protects the outside of the inner pipe 11.
The inner tube 11 has a large number of small holes 12 with a diameter and pitch that allow the water to be treated or air to flow out evenly.

In addition, the outer tube 13 is provided with a large number of small holes 14 whose diameter is as large as possible without allowing the filling material to pass through.
Since the double pipe 10 is directly buried in the layer of filler material, it can withstand the weight of the filler material.

Note that the small holes 12 and 14 attached to the inner tube 11 and the outer tube 13 are preferably opened downward.

When water or air to be treated is supplied from the inner pipe 11, the water or air to be treated flows through the small holes 12 into the inner pipe 11 and the outer pipe 13.
It can evenly flow out into the space of the filling material, and can be evenly supplied to the filling material layer through the small hole 14 of the outer tube 13.

By making the Aze supply tubes 4 and 5 double tubes 10 in this way, the inner tube 11 does not come into direct contact with the filling material, so it is possible to prevent microorganisms from adhering to the small holes 12 and causing clogging. In addition, the small holes 14 of the outer tube 13 are made as large as possible in diameter without allowing the filling material to pass through, so even if microorganisms adhere to the small holes 14, clogging is unlikely to occur, and the water to be treated or air is removed from the double tube 10. can be evenly supplied to the layer of filler.

According to the fixed bed catalytic oxidation tank of the present invention, the air supply pipe and the water supply pipe to be treated, each having a double pipe structure, are buried at the bottom of the layer of filler, one each, or a number of pipes at appropriate intervals. Therefore, water and air to be treated can be evenly supplied to the layer of filler from each supply pipe, and since the supply pipe is installed directly within the layer of filler, it is possible to fill the support screen etc. There is no need to provide a support mechanism for the material, which shortens the construction period and reduces construction costs.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a front view of the fixed bed catalytic oxidation tank of the present invention, and FIG. 2 is a side view of FIG. 1. Moreover, FIG. 3 is a longitudinal sectional view of a double pipe used in the present invention. 1...Fixed bed contact oxidation tank, 2...Filler layer, 3...Water to be treated inflow pipe, 4...
・Water supply pipe to be treated, 5... Air supply pipe, 6...
... Air inflow pipe, 7 ... Air generator, 8.
...Treatment water pipe, 9...Branch pipe, 10...
...Double pipe, 11...Inner pipe, 12...
...Small hole, 13...Outer tube, 14...Small hole.

Claims (1)

[Scope of utility model registration request] The tank is filled with a filler material on which aerobic microorganisms have grown, and the lower part of the filler layer has a double-tube structure consisting of an outer tube and an inner tube with many small holes. A fixed bed catalytic oxidation tank characterized in that a water supply pipe and an air supply pipe are buried respectively, and the water to be treated and the air are respectively supplied in an upward flow to a layer of filler from the inner pipe of the double pipe.