JPH02241598A - Sewage water treating device of ultradeep aeration type - Google Patents

Abstract

PURPOSE:To provide the subject apparatus inexpensive to install by fabricating said apparatus composed mainly of a head tank and a downstream and an upstream chamber of an aeration tank, these chambers being constructed by structural members of the type employed for building construction. CONSTITUTION:A sewage treating device of ultradeep aeration type is composed of a conducting pipe 2, a head tank 3, a downstream chamber 4 of an aeration tank, an upstream chamber 5 thereof, a communicating pipe 6, diffusing pipes 7 and 8, a compressor and a sludge discharge pipe 9. The downstream and upstream chambers 4 and 5 are constructed by structural members, e.g. the type employed as building post. The sewage water carried off from each floor of an office building and gathered in an underground part is sent up into the head tank 3 by a pump 1. Air is then supplied from the dispersing pipes 7 and 8 to provide a circulation flow of the sewage water through the head tank 3, the downstream chamber 4, the communicating pipe 6 and the upstream chamber 5. This circulation permits micoorganisms in the aeration tank to be grown in a large population for use for sewage water treatment. Such sewage water treating device can be installed near a sewage producing location as well as manufactured at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an ultra-deep aeration type sewage treatment device used for treating sewage and the like.

[Prior Art] An ultra-deep aeration type sewage treatment device is a sewage treatment device used when treating wastewater such as sewage, human waste, and industrial wastewater by an activated sludge method. The activated sludge method is a method of purifying wastewater by bringing a floc-like microbial population with a purification function into contact with wastewater in a reaction system, allowing the microorganisms to eat the pollutant components, and the microorganisms require oxygen for metabolism. Therefore, it is necessary to supply oxygen by blowing air into a water tank (called an aeration tank), which is one reaction system.In ultra-deep aeration type sewage treatment equipment, the aeration tank has a diameter of 0.5 to 6 m and a depth of 40 to 150 m. Because the tank is shaped like a deep pit, it is under high pressure, and the oxygen contained in the bubbles that are blown in strongly dissolves into the wastewater, making it possible to maintain a large number of microorganisms in the aeration tank. It has the advantage that the throughput per unit volume of the tank is large.

The configuration of this ultra-deep aeration type sewage treatment equipment was
It has the configuration described in No. 38031. That is, as shown in FIG. 3, the ultra-deep aeration type sewage treatment equipment 31 includes a head tank 32, a downward flow chamber 33 that is attached to extend below the head tank 32, and a lower part of the downward flow chamber 33. The upper flow chamber 34 communicates with the upper part of the lower flow chamber 33 via the head tank 32 at the upper part, and the lower flow chamber 33 and the upper flow chamber 34 are discharged into an approximately intermediate portion. Diffuser pipes 35 and 36 having ports and a compressor (not shown) that supplies air to the diffuser pipes 35 and 36
It is composed of

When treating wastewater with this ultra-deep aeration type sewage treatment apparatus 31, the head tank 32, downward flow chamber 33, and upward flow chamber 34 are filled with wastewater and microorganisms for treating the wastewater. Then, air is blown into the waste water through the air diffuser 36 of the upward flow chamber 34111.The blown air floats upward in the waste water, but the waste water in the upward flow chamber 34 contains the blown air. As a result, the wastewater in the downward flow chamber 33 is apparently lighter than that in the downward flow chamber 33, so a pressure difference is created between the compartments, and as shown in FIG. 4, the wastewater in the upward flow chamber 34 flows upward and downward. The waste water in the chamber 33 forms a downward circulating flow.

After such a state is formed, air is blown into the waste water from the aeration pipe 35 of the downward flow chamber 33.The flow rate of the blown air is 1 m/sec, whereas the air velocity is 1 m/sec. Since the speed at which the air tries to rise is about 0.3 m/sec, the air blown into the downward flow chamber 33 descends within the downward flow chamber 33 along with the circulating flow, and is reversed at the bottom point. It rises inside the downward flow chamber 34. In this way, sufficient air can be supplied to the wastewater, so the microorganisms in the wastewater are activated.
They begin to eat a lot of pollutants in sewage.

A part of the sewage treated in this manner is separated into treated water and sludge through the treatment process shown in FIG. 5, for example, to complete the treatment. In addition, some of the sewage becomes circulating water together with the newly supplied sewage, creating a flow of water that is continuously treated.

This sewage treatment process will be explained in detail based on FIG. 5 as follows. That is, treated raw water 41 from which coarse dust has been removed in advance using a screen or the like is sent to an ultra-deep aeration type sewage treatment device 42 . The raw water 41 is treated as described above, and a part of the treated raw water 41 (an amount corresponding to the amount of newly supplied raw water) is taken out from the ultra-deep aeration type sewage waste treatment equipment 42 and subjected to vacuum decomposition. Sent to air tank 43,
Here, the treated water is degassed to remove gases attached to floc-like pollutants in the treated water, making it easier for the pollutants to settle. This treated water is further sent to a stirring tank 44, where a flocculant is added and the treated water is stirred, thereby making it easier for the pollutants to aggregate to a large extent and to be more easily precipitated. The treated water is led to the final settling tank 45, and the pollutants in the treated water are deposited on the bottom of the tank. The treated water 46 from which pollutants have been removed in this manner is reduced in area and discharged into a river or the like. The pollutants deposited as sludge in the final settling tank 45 are extracted from the settling tank 45 by a pump 47, dried, and disposed of.

In the ultra-deep aeration type sewage treatment equipment used in this way, air can easily penetrate into the wastewater.
It is necessary to increase sewage treatment efficiency by activating microorganisms in sewage. Therefore, the aeration tank is deepened to increase the hydrostatic pressure in the aeration tank, so the depth of the aeration tank is 40 to 15 cm.
The depth becomes 0m. Therefore, normally a hole is dug vertically underground and an aeration tank is installed in this hole.

[Problem M to be solved by the invention] Therefore, conventional ultra-deep aeration type sewage treatment equipment is expensive to install, and its installation location is limited, and it is often installed at a location far from the sewage generation location. Therefore, it was necessary to construct sewers and other facilities to introduce sewage.

This invention solves the above-mentioned problems of the prior art,
The purpose of the present invention is to provide an ultra-deep aeration type sewage treatment device that is inexpensive to install and can be installed close to the location where sewage is generated.

, [Means for solving problems] The ultra-deep aeration type sewage treatment equipment according to the present invention includes a head tank, a downward flow chamber of the aeration tank extending downward from the head tank, and a downstream flow chamber. In an ultra-deep aeration type sewage treatment equipment consisting of an upward flow chamber of an aeration tank which communicates at the lower part and communicates with the upper part of the downward flow chamber through a head tank at the upper part, the structural members of the structure are aerated. This is an ultra-deep aeration type sewage treatment equipment with a downward flow chamber and a downward flow chamber in the tank.

[Function] The ultra-deep aeration type sewage treatment equipment according to the present invention has a head tank, a downward flow chamber of the aeration tank extending downward from the head tank, and a downstream flow chamber that communicate with each other at the lower part, and a head tank at the upper part. In an ultra-deep aeration type sewage treatment equipment consisting of a downward flow chamber of an aeration tank communicating with the upper part of the downward flow chamber via a tank, structural members of the structure are connected to the downward flow chamber of the aeration tank and the upper chamber. Since it is a countercurrent chamber, the installation cost is low, and since it can be installed at a location where sewage is generated, special construction such as constructing a sewage channel is not required.

[Example] An ultra-deep aeration type sewage treatment apparatus according to one embodiment of the present invention is shown in Fig. 1, and an ultra-deep aeration type sewage treatment apparatus according to another embodiment is shown in Fig. 2.
This will be explained using figures.

FIG. 1 is an explanatory diagram showing a device configuration in which the columns of a building are used as the downward flow chambers and downward flow chambers of the aeration tank of an ultra-deep aeration type sewage treatment device. In this case, the sewage to be treated is the sewage generated within the building, and the sewage generated on each floor collects in the basement of the building. Then, this sewage is sent to the head tank 3 of the ultra-deep aeration type sewage treatment equipment by the pump 1 via the water conduit 2 using the pillars of the building.The configuration of the ultra-deep aeration type sewage treatment equipment of the present invention will be explained. Then it becomes as follows. That is, the ultra-deep aeration type sewage treatment equipment of the present invention utilizes a water conduit 2, a head tank 3 that receives sewage from the water conduit 2, and a pillar of a building that communicates with the upper part via this head tank 3. The downward flow chamber 4 and the upward flow chamber 5, the communication pipe 6 that communicates the downward flow chamber 4 and the upward flow chamber 5 at the lower part thereof, and the downward flow chamber 4 and the upward flow chamber 5, respectively. Diffusion pipes 7 and 8 having a discharge hole in the middle part, and aeration pipes 7 and 8
It consists of a compressor (not shown) that supplies air to the sludge discharge pipe 9 and a sludge discharge pipe 9.

Therefore, by supplying air through the diffuser pipes 7 and 8 as in the conventional ultra-deep aeration type sewage treatment equipment, sewage is circulated through the head tank 3, the downward flow chamber 4, the communication pipe 6, and the upward flow chamber 5. It can form a flow, and by keeping a large amount of microorganisms in the aeration tank, sewage treatment can be performed.

Figure 2 shows the installation when the piles of the offshore structure are used as the downward flow chamber and upward flow chamber of the aeration tank! It is an explanatory view showing one ellipse formation. The equipment configuration in this case is the same as in the case of a building, with a water pipe 2, a head tank 3 that receives sewage from the water pipe 2, and a downward flow using a pile connected at the top via the head tank 3. chamber 4 and upward flow chamber 5; downward flow chamber 4 and upward flow chamber 5;
A communication pipe 6 that communicates with the lower part of each, and a downward flow chamber 4.
The upflow chamber 5 is composed of aeration pipes 7 and 8 having discharge holes in the middle thereof, a compressor (not shown) that supplies air to the aeration pipes 7 and 8, and a sludge discharge pipe 9. However, in the case of offshore structures, the residential areas are located at the top of the structure, so unlike buildings, there is no need to pump sewage to an ultra-deep aeration type sewage treatment system. Furthermore, since the sewage is circulated through seawater, there is an advantage that the reaction heat generated during sewage treatment can be cooled with seawater.

[Effects of the Invention] According to the present invention, an ultra-deep aeration type sewage treatment device can be manufactured at low cost. Moreover, it can be installed close to the place where sewage is generated.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the equipment configuration of an ultra-deep aeration type sewage treatment equipment according to one embodiment of the present invention, and Fig. 2 is an explanatory diagram showing the equipment W and configuration of an ultra-deep aeration type sewage treatment equipment according to another embodiment of the present invention. Figure 3 is a perspective view of a conventional ultra-deep aeration type sewage treatment equipment.
FIG. 4 is a sectional view of the lower end portion of the aeration tank of a conventional ultra-deep aeration type sewage treatment apparatus, and FIG. 5 is a process diagram showing the entire process of sewage treatment. DESCRIPTION OF SYMBOLS 1...Pump, 2...Water pipe, 3...Head tank, 4...Downward flow chamber of aeration tank, 5...Upward flow chamber of aeration tank, 6...Communication pipe , 7... Aeration pipe, 8... Aeration pipe, 9... Sludge discharge pipe.

Claims (1)

[Claims] The head tank and the downward flow chamber of the aeration tank extending downward from the head tank communicate with the downward flow chamber at the lower part and communicate with the upper part of the downward flow chamber through the head tank at the upper part. An ultra-deep aeration type sewage treatment device comprising an upward flow chamber of an aeration tank, characterized in that the structural members of the structure are the downward flow chamber and the upward flow chamber of the aeration tank. Processing equipment.