JPH01317594A - Waste water treatment device - Google Patents

Abstract

PURPOSE:To allow an aeration-circulating current to flow down uniformly and thereby eliminate a dead space for contact materials by arranging air diffusion pipes in an aeration chamber to form an air diffusion section for an ascending current and a contact materialfilled section for a descending current and slanting the upper ends of the contact material by lowering the upper end to the air diffusion side sequentially. CONSTITUTION:A circulating current is generated in an aeration chamber 3 by ejecting air from an air diffusion pipe 11 installed in the middle of the bottom of the aeration chamber 3 of a contact aeration-type cleaning tank 1. Thus an air diffusion section is formed at the center and a contact material-filled section is formed on the both sides of the former. In the meantime, the upper ends of contact materials 14 are positioned obliquely so that the upper ends become lower sequentially toward the air diffusion section at the center. Under this design, the fouled water after separation of the solid component is introduced into the aeration chamber 3 to generate the circulating current. Subsequently, this current runs down uniformly through gaps 19 between water passages, contacting a microbe membrane formed sticking to the contact materials. In this way, the fouled water is cleaned and the problem of dead space for the contact materials 14 is solved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a contact aeration type wastewater treatment in which wastewater is circulated and brought into contact with a microbial film attached to a contact material in an air chamber for purification. The present invention relates to a wastewater treatment device that has been improved to make effective use of a contact material filled in an aeration chamber.

(Conventional technology) Generally, as a contact aeration type wastewater treatment equipment.

There are many types such as the precipitation separation contact aeration method, the anaerobic filter bed method, and the contact aeration method with a flow rate adjustment tank.In addition, for tertiary treatment, a contact aeration tank and a settling tank are sequentially added after the secondary treatment facility. There is also.

8 and 9 show a contact aeration type septic tank showing an example of a conventional contact aeration type wastewater treatment device, and the contact aeration type septic tank includes a tank body 23, a sedimentation separation chamber 24. Aeration room 25
, sedimentation chamber 26, disinfection chamber 27, wastewater inflow pipe 28. Treated water outflow pipe 29. Contact material 30, advection wall 31, aeration pipe 32. It is composed of an overflow weir 33, a medicine cylinder 34, and the like. Further, as shown in FIG. 8, the contact material 30 includes a corrugated contact material 30 formed by laminating plastic corrugated sheets 36 having protrusions 35 at appropriate intervals, and a large number of loops (not shown). A string-like contact material formed by connecting sections is used, and these are applied to the section of the aeration chamber 25 where a downward flow occurs by an appropriate method. ! 2-position fixed foot.

Thus, the wastewater flowing in from the wastewater inflow pipe 28 enters the aeration chamber 25 through the advection wall 31 after solids are separated in the sedimentation separation chamber 24 . In this aeration chamber 25, the first
As shown in Figure 0, an aeration swirl flow is generated by the air ejected from the aeration pipe 32, and when this swirling flow passes through the water flow passage gap formed in the contact material 30, it comes into contact with the microbial film formed on the contact material 30. , sewage purification is being carried out. After the sewage that has undergone aeration treatment has sludge removed in the settling chamber 26,
The treated water passes over the overflow weir 33 and enters the disinfection room 27, undergoes sterilization, and is discharged to the outside from the treated water outflow pipe 29.

[Problem to be solved by the invention]

By the way, in order to increase the aeration treatment capacity of wastewater, contact material 30
It is necessary to propagate microorganisms on the surface to form a microbial film, and to ensure sufficient contact between this and the Fj water.

However, in the conventional contact aeration chamber septic tank, the contact material 30 whose upper end is formed is used, so the upward flow in the aeration chamber 25 is between the upper end of the contact material 30 and the water surface. The flow becomes horizontal.

At this time, a load is generated by the water flow at the upper end of the contact material 30 near the upward flow part, and an upward flow is partially generated as shown in FIG. Contact material 3
There was a problem in that a dead space was created in a part of the area (near the part where the upward flow occurs) and was not used effectively.

In order to prevent the problem mentioned above, even in the conventional contact aeration type septic tank, a rectifier pipe 37 is installed above the contact material 30 as shown by the dashed line in Fig. 9, and the aeration is turned around. Efforts have been made to ensure that the downward flow is even.

However, even with the above-mentioned efforts, the dead space generated in the contact material 30 cannot be completely eliminated, and it remains a major problem in contact aeration type septic tanks.

As described above, in conventional contact aeration type septic tanks, dead space is created in the contact material 30, so in order to obtain the desired treatment capacity, the contact material 30 must be made larger in advance. However, there was a problem in that the size of the tank body 1 was increased.

This invention was devised to solve the above problems, and its purpose is to create a contact aeration type wastewater treatment device that can prevent dead spaces from occurring in the contact material and also make the device itself more compact. is to provide.

[Means to solve problems]

In order to achieve the above objects, 1 the wastewater treatment device of the present invention is provided by filling an aeration chamber with a contacting material that forms a microbial film, and bringing the wastewater that has flowed into the aeration chamber into circulation contact with the contacting material, so that the microbial film sequentially turns the wastewater into wastewater. In a contact aeration type wastewater treatment device that performs purification treatment, an aeration pipe is arranged in the aeration chamber to form an aeration section where an upward flow occurs and a contact material filling section where a downward flow occurs. The contact material filling portion is filled with a contact material formed in an inclined shape such that the upper end portion thereof is gradually lowered toward the air diffuser portion.

[Effect]

An aeration pipe is disposed in the aeration chamber to form an aeration part where an upward flow occurs and a contact material filled part where a downward flow occurs, and the upper end of the contact material filled part is gradually moved toward the aeration part side. When the contact material is filled with a contact material formed in an inclined shape so as to be lower, wastewater flows into the aeration chamber, and air is ejected from the aeration pipe, an aeration swirl flow is generated, and this flows into the water flow passage gap formed in the contact material. As the wastewater passes through the wastewater, it comes into contact with the microbial film that has formed on the contact material, and the wastewater is purified.

In addition, since the contact material is formed in an inclined shape so that the upper end thereof becomes gradually lower toward the air diffuser side, the resistance to the horizontal flow increases. As a result, the aeration swirl flow evenly flows downward through the water flow passage gap of the contact material, and no dead space is created in the contact material.

Therefore, the contact material can be used effectively, the aeration processing capacity can be improved, and the device itself can be made smaller.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figures 1 to 3 show a contact aeration type septic tank, which is an example of a contact aeration type wastewater treatment system, in which 1 is the tank body, 2 is a sedimentation separation chamber, 3 is an aeration chamber, 4 is a sedimentation chamber, and 5 is a Disinfection room, 6 sewage inflow pipe, 7 treated water outflow pipe, 8 advection wall, 9 sedimentation chamber partition wall, 10 sedimentation chamber partition wall, 11 air diffuser pipe, 12
13 is a blower, 14 is a contact material, and 15 is an air supply pipe for aeration.
16 is an overflow weir, and 16 is a medicine cylinder.

The aeration chamber 3 has a precipitation separation chamber partition wall 9 and a precipitation chamber partition wall 1.
0 and both side walls of the tank body 1, an aeration pipe 11 is disposed therein, and a contact material 14 is filled therein.

The aeration pipe 11 is installed at the center of the bottom of the aeration chamber 3 in the longitudinal direction of the tank body 1 to form an aeration section in which an upward flow occurs and a contact material filling section in which a downward flow occurs in the aeration chamber 3. located along the

Therefore, when dirty water flows into the aeration chamber 3 and air is blown out from the aeration pipe 11, an upward flow is created in the center of the aeration chamber 3.
Further, downward flows will occur on both sides of the air.

That is, an aeration swirl flow is generated in the aeration chamber 3, the central part of the aeration chamber 3 becomes an aeration part, and the parts on both sides thereof become contact material filling parts.

On the other hand, as shown in FIG. 4, the contact material 14 is made up of a plurality of rectangular corrugated plates 18 made of plastic rings, each of which has cylindrical protrusions 17 having an appropriate length bulging out at a constant pitch on both sides. The corrugated plates 18 are assembled by bonding or welding the corrugated plates 18 through the protrusions 17, and each protrusion 1
7, a water flow passage gap 19 is formed between the corrugated plates 18.

Further, the upper end portion of the contact material 14 is as shown in FIG.

When the contact material filling part of the aeration chamber 3 is filled with this, it is formed in an inclined shape so that it becomes gradually lower toward the aeration part side. Note that the tip of each projection 17 is in a closed state.

Then, the contact material 14 is placed in the contact material filling part in the aeration chamber 3 in an appropriate manner so that it is perpendicular to the direction of the aeration swirl flow, that is, so that each corrugated plate 18 is along the longitudinal direction of the tank body 1. The installation is fixed by.

Although this contact material 14 is not shown, it is arranged so that it is parallel to the direction of the aeration swirl flow, that is, so that each corrugated plate 18 is perpendicular to the longitudinal direction of the tank body 1.

It may be installed and fixed in the contact material filling part.

Next, the operation of the contact aeration type septic tank will be explained.

The wastewater flowing in from the wastewater inflow pipe 6 has solids separated in the sedimentation separation chamber 2, and then enters the aeration chamber 3 through the advection wall 8. In this aeration chamber 3, an aeration swirl flow is generated by the air ejected from the aeration pipe 11, and this flows into the contact material 14.
When the water passes through the flow passage gap 19, it comes into contact with the microbial film formed on the surface of the corrugated plate 18, and the wastewater is purified.

In addition, since the contact material 14 is formed in an inclined shape so that its upper end becomes gradually lower toward the aeration part side, the resistance to the horizontal flow of the aeration swirl flow increases. Therefore, the aeration swirl flow uniformly flows downward through the water flow passage gap 19 of the contact material 14. As a result, there is no dead space in the contact material 14, which can be used effectively.

After the aerated wastewater has its sediment removed in the settling chamber 4, it crosses the overflow weir 15 and enters the disinfection chamber 5, where it is sterilized and discharged to the outside from the outflow pipe 7. .

In the above embodiment, a corrugated plate 18 having protrusions 17 formed at a constant pitch on both sides is used as the contact material 14, but in other embodiments, the corrugated plate 18 has protrusions 17 formed at a constant pitch on only one side. A corrugated plate 18 having protrusions 17 formed at a pitch of 100 mm may also be used.

Further, in the above embodiment, a contact material 14 made of a plurality of corrugated plates 18 pasted together at regular intervals was used as the contact material 14, but in other embodiments, the corrugated plates 18 A contact material having one or more nets sandwiched between them may also be used.

Further, in the above embodiment, a corrugated plate-like contact material was used as the contact material 14, but in other embodiments, a string-like contact material was used as shown in FIGS. 5 to 7. Although not shown,
A net-like contact material and a loofah-like contact material may be used respectively.

The string-like contact material 14 is formed by forming a plurality of loops 21 in series on a plastic string 20 of an appropriate length, and supports tubes 22 arranged in parallel above and below the contact material-filled portion of the aeration chamber 3. As shown in FIG. 6, the racks are passed one after another in a meandering manner. still,
Each of the upper support tubes 22 is arranged in an inclined state so that the upper end of the contact member 14 becomes gradually lower toward the air diffuser.

In addition, the wastewater treatment equipment is not limited to the above-mentioned contact aeration type septic tank, but as long as it is a contact aeration type, it can be of any structure and shape. In the wastewater treatment apparatus of the present invention, an aeration chamber in which an upward flow occurs and a contact material filling part in which a downward flow occurs are respectively formed, and the contact material filling part has an upper end facing toward the aeration part. This is because the structure is such that the contact material is filled in an inclined manner so that the contact material gradually becomes lower.

Resistance increases against the lateral flow of the aeration swirl flow. As a result, the aeration swirl flow that has undergone a direction change from an upward flow to a downward flow flows evenly downward through the water flow passage gap formed in the contact material, and no dead space is created in the contact material.

Therefore, the contact material can be used effectively, and there is no need to make the contact material larger than necessary or to arrange a rectifier pipe in the aeration room as in the past, improving the aeration processing capacity and improving the equipment. The device itself can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal side view of a contact aeration type septic tank according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional plan view, FIG. 3 is a partially schematic vertical front view, and FIG. An enlarged cross-sectional plan view, FIG. 5 is a partially schematic longitudinal sectional side view of a contact aeration type septic tank according to another embodiment, FIG. 6 is a partially schematic longitudinal sectional front view, and FIG. A partially enlarged front view, and FIG. 8 is a schematic cross-sectional plan view of a conventional contact aeration type septic tank. FIG. 9 is a partially schematic longitudinal sectional front view, and FIG. 10 is an explanatory diagram showing an outline of the aeration swirl flow in the aeration chamber of a conventional contact aeration type septic tank. 3 is an aeration chamber, 11 is an aeration pipe, and 14 is a contact material. 1 other personFigure 1Figure 3

Claims (1)

[Claims] 1. Contact material (1) where a microbial film is formed in the aeration chamber (3)
In a contact aeration type wastewater treatment device filled with 4), the wastewater flowing into the aeration chamber (3) is brought into circulation contact with the contact material (14) to sequentially purify the wastewater with a microbial membrane. , an aeration pipe (11) is arranged in the aeration chamber (3) to form an aeration part where an upward flow occurs and a contact material filled part where a downward flow occurs; 1. A wastewater treatment device, characterized in that the contact material (14) is filled with a contact material (14) formed in an inclined manner so that the part thereof becomes gradually lower toward the aeration part side.