JPH0157639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluidized carrier biological treatment device for treating wastewater with activated sludge deposited on a carrier.

[Problem to be solved by the invention]

However, even if it is possible to efficiently treat wastewater by depositing activated sludge on this coral powder, it is not sufficient to demonstrate its efficiency from the equipment perspective, especially when the amount of wastewater increases. There is a limit to the amount of processing. Furthermore, installing this type of processing device requires a large area, and it is difficult to adapt it to the size of the installation location, which poses a problem.

The purpose of this invention is to achieve extremely efficient processing by adopting a prismatic cylindrical processing tank with a rectangular cross section instead of a general cylindrical tank type processing equipment or a large processing equipment. To provide a treatment device which allows a plurality of unit type fluidized carrier biological treatment devices to be installed in parallel or adjacent to each other in series even when the amount of wastewater to be treated increases, in other words, can be supplemented and can be configured compactly. That's true.

[Means to solve the problem]

In order to solve the above problems and achieve the above objects, the present invention is configured as follows. That is, the present invention has a treatment tank in which waste water is circulated and a carrier formed of opposite side walls having an inclined wall portion on at least one side and both side walls having parallel wall portions facing each other. A settling part is formed in the treatment tank, a settling separation part is formed on the overflow side of the treatment tank for separating sludge and carriers, and an air lift part is further formed in the treatment tank by a removable partition wall. , a unit type fluidized carrier characterized in that a plurality of the processing tanks can be arranged adjacently so that the side wall of the processing tank and the side wall of another processing tank are in contact with each other. Regarding biological treatment equipment.

Further, in this unit type fluidized carrier biological treatment apparatus, the inclined wall part for circulating and settling the carriers floating through the air lift part is inclined at an angle of 50 degrees or more, and the sedimentation separation part is connected to the inclined wall. It is formed by hanging a small partition above the section.

[Effect]

This invention is configured as described above and operates as follows. That is, since at least one side wall of the treatment tank for circulating the carrier and waste water in this unit type fluidized carrier biological treatment apparatus has an inclined shape, the carrier particles can be circulated together with the circulating liquid without staying on the side wall. Further, the processing tank is formed of both side walls facing each other and having an inclined wall portion on at least one side, and both side walls having parallel wall portions facing each other, and further, Since the plurality of treatment tanks can be arranged adjacently so that the side walls of the treatment tanks are in contact with each other, one or more treatment tanks can be installed depending on the amount of wastewater. Furthermore, an appropriate number of treatment tanks can be installed depending on the size of the installation location, and the unit type fluid carrier biological treatment apparatus itself is compactly constructed and exhibits treatment capacity according to the amount of wastewater.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a unit type fluid carrier biological treatment apparatus according to the present invention will be described with reference to the drawings.
1A and 1B, one embodiment of a unit type fluid carrier biological treatment apparatus according to the present invention is shown. FIG. 1A is a plan view showing an embodiment of a unit type fluid carrier biological treatment apparatus according to the present invention, and FIG. 1B is a longitudinal sectional view of FIG. 1A.

This unit-type fluidized carrier biological treatment apparatus treats activated sludge deposited on carrier particles by circulating it around an internal partition wall while blowing air into it and bringing it into contact with inflowing wastewater. FIG. 1A shows a state in which a treatment tank 1 in this unit type fluidized carrier biological treatment apparatus is formed into a rectangular shape. The treatment tank 1 forms a tank in which carrier particles 9 and waste water are circulated.
has a rectangular cross section, and opposite side walls corresponding to the long sides of the rectangle are formed as parallel walls,
In addition, as shown in FIG. 1B, one of the two side walls 2 corresponding to the short sides of the rectangle is vertically downward, and the other is formed as an inclined wall portion 4. Further, a partition wall 5 is disposed separably between the side wall of the vertically falling parallel wall section, and an air lift section 10 is formed inside the processing tank 1 by the partition wall 5. Figure 1B
, wastewater is caused to flow in from the lower part of the treatment tank 1 as shown by the arrow W, and the air lift section 10 formed between one of the falling side walls 2 of the treatment tank 1 and the partition 5
The wastewater floats up while coming into contact with carrier particles on which activated sludge has been deposited by air (indicated by arrow A in the figure). After floating, the flow circulates as shown by the arrow in the figure, descends in the processing tank 1, reaches the lower part, and is repeatedly circulated and cleaned through the air lift section 10 again. Although the carrier particles 9 also circulate together with the circulating fluid, the side wall opposite the air lift section 10, that is, the inclined wall section 4,
Since it has an inclined structure with an angle of 50 degrees or more, it can be circulated without stagnation on the side wall. The angle is
If the angle is less than 50°, part of the carrier particles that are not accompanied by the circulating fluid will remain on the side wall, creating an anaerobic state and hindering aerobic digestion of microorganisms, which is not preferable. A sedimentation separation section for separating sludge and carriers 9 is formed on the overflow section 3 side of the treatment tank 1 . This sedimentation/separation section is formed by suspending a small partition wall 6 above the inclined wall section.

The position where the partition wall 5 forming the air lift section 10 is installed is determined based on the amount of waste water, the amount of air, the BOD load of the waste water, and the BOD.
Although it is not constant depending on the concentration, residence time, etc., it is appropriately selected between the center point of the distance between the falling side wall and the falling part of the inclined wall portion 4 to the falling side wall. That is, if the distance between the falling side wall and the partition wall 5 is B, and the distance between both side walls (the length of the tank) is L, then 1/2L≧B>0. This partition wall 5 is, for example,
As shown in FIG. 1A, the width of the processing tank 1 may be one section to form an air lift section 10, and a third section may be formed.
As shown in Figure B, the air lift section 10 may be divided into three sections.
As shown in FIG. 2, the air lift portion 10 may be formed into several circular sections. The air lift section 10 provided in the processing tank 1 has a larger air lift effect in a divided structure because when the air amount is the same, the air does not diffuse and rises in a concentrated manner within a narrow section. The circulating carrier particles 9 fill approximately 10% of the volume of the processing tank 1. Further, the amount of air to be blown is determined by selecting the larger of the BOD of the wastewater to be treated and the amount required to flow the carrier particles 9 by the air lift. On the other hand, the wastewater to be treated may flow in from the upper or lower part of the treatment tank 1.

The treated wastewater passes through the gap at the bottom of the small partition wall 6 on the inclined side wall, reaches the treated water reservoir 8, overflows, and is discharged outside the system. At this time, the carrier 9 is
The sludge separated from the carrier 9 is separated from the carrier 9. In this sedimentation separation section, the sedimentation rate of the carrier 9 depends on its particle size, porosity, adhering sludge and its amount, but is generally 5 to 15 cm/min, so the carrier 9 does not flow out of the system. Any method may be used as long as it is suitable for the purpose of achieving the above-mentioned sedimentation. It should be smaller than the speed. Note that 7 in the figure indicates an inclined plate.

The processing equipment of this invention is easiest to operate when the volume is 1 to 20 m ³ (for example, the length of the upper rectangle is 2 m in the longitudinal direction, the width in the lateral direction is 1 m, and the height is 4 to 5 m). Operation becomes complicated. Therefore,
If the amount of wastewater to be treated becomes large, a plurality of treatment tanks 1 can be arranged to treat the wastewater. For example, as shown in FIG. 5, two processing tanks 1 can be arranged in series. That is,
The side wall of the processing tank 1 and the side wall of another processing tank 1 are connected to the fifth
2 so that they are in contact with each other as shown in the figure.
The processing tanks 1 are arranged adjacent to each other. Or the sixth
As shown in the figure, three processing tanks 1 can be installed in parallel. That is, processing tank 1
The three processing tanks 1 are arranged adjacent to each other so that the side wall of one processing tank 1 and the side wall of another processing tank 1 are in contact with each other, as shown in FIG.

This unit type fluid carrier biological treatment equipment was installed in the fifth
Instead of adding two processing tanks 1 as shown in the figure, it is also possible to form a structure in which two processing tanks 1 are added by omitting the falling side walls, as shown in Fig. 2A and Fig. 2B. .

2A and 2B, another embodiment of a unit type fluid carrier biological treatment apparatus according to the present invention is shown. FIG. 2A is a plan view showing another embodiment of the unit type fluid carrier biological treatment apparatus according to the present invention, and FIG. 2B is a longitudinal sectional view of FIG. 2A. This unit-type fluidized carrier biological treatment apparatus has no other features than the treatment tank 11 of the above embodiment, except that the treatment tank 11 is formed in the form of two treatment tanks 1, with the falling side walls omitted and added. Since they have the same configuration and function, explanations regarding the same configuration and function will be omitted here.

The processing tank 11 of this unit type fluidized carrier biological treatment apparatus has a rectangular cross section, and has parallel side walls facing each other corresponding to the long sides of the rectangle, and parallel walls corresponding to the short sides of the rectangle. A sloped wall portion 4 is formed with both side walls sloped. Processing tank 1
Partition walls 5, 5' are provided within which a divisible air lift section 10 can be formed. Air lift part 1
Since the carrier 9 floating through 0 circulates and settles,
The inclined wall portion 4 of the side wall of the treatment tank is inclined at an angle of 50° or more, and the sedimentation and separation section has a small partition wall 6 suspended above the inclined inclined wall portion 4. Regarding the interval B' between the partition walls 5 and 5' for forming the air lift part 10 in the processing tank 11, from the relational expression 1/2L≧B>0 for the interval B in the processing tank 1, the interval B' is the interval 2B. Therefore, it is sufficient if 1/2L≧1/2B′>0. Clockwise and counterclockwise airlifts are formed within the airlift portion 10 formed by the partition walls 5, 5'. Furthermore, as shown in FIG. 3B or FIG. 4B, the air lift portion 10 formed by the partition walls 5 and 5' is
Of course, it is also possible to divide it into several sections.

〔Effect of the invention〕

Since the unit type fluid carrier biological treatment apparatus according to the present invention is constructed as described above, it has the following effects. That is, this unit-type fluidized carrier biological treatment apparatus is a treatment system in which wastewater and a carrier are circulated, which are formed by opposite side walls having inclined walls on at least one side and opposite parallel walls. A settling section is formed in the treatment tank, a settling separation section is formed on the overflow side of the treatment tank for separating sludge and carriers, and a removable partition is provided in the treatment tank. In addition, the plurality of processing tanks can be arranged adjacently so that the side wall of the processing tank and the side wall of another processing tank are in contact with each other. By installing multiple treatment tanks, the treatment equipment can be configured to have a capacity that corresponds to the required amount of wastewater, and
The air lift portion can be formed within a range of air amount according to the inflow amount of waste water and the required amount of air, which differ depending on the type of waste water, so that waste water can be treated economically.

That is, if the capacity of one treatment tank is insufficient, it can be dealt with by installing a plurality of treatment tanks adjacent to each other in parallel or in series, in other words, by adding a plurality of treatment tanks. In this case, the shape of the processing tank is formed of both side walls facing each other and having an inclined wall portion on at least one side and both side walls consisting of parallel wall portions facing each other, in other words, the processing tank Since the cross section of the tank is rectangular, which is a suitable shape for addition, there is an advantage that a plurality of the processing tanks can be compactly installed at a predetermined location and can be arranged according to the size of the installation location.

Furthermore, when multiple treatment tanks are installed,
Since the air lift portions are formed independently in the processing tanks, a uniform aeration state can be obtained for each processing tank. Therefore, the conventional 1
In processing equipment that has multiple air lift sections in each processing tank, phenomena such as uneven aeration conditions within the processing tank, causing the carriers to shift and the fluidized bed to become uneven, occur. However, the unit type fluidized carrier biological treatment apparatus according to the present invention can achieve a uniform aeration condition in each treatment tank, so that the carriers are uniformly dispersed in each treatment tank and the most preferable flow rate is achieved. state can be secured.

Further, the carrier also circulates together with the circulating liquid, but since the inclined wall portion has an inclined structure having an angle of 50° or more, the carrier is circulated without staying on the side wall of the processing tank, and is not included in the circulating liquid. A part of the unaccompanied carrier particles remains on the side wall, and the carrier becomes anaerobic, thereby preventing the aerobic digestion of microorganisms from occurring. Further, on the overflow side of the treatment tank, a settling separation section is formed by vertically installing a small partition above the inclined wall section, so that separation of the sludge and the carrier is reliably achieved. It can be constructed such that it is not affected by turbulent flow due to aeration in the processing tank, and the rising speed is smaller than the settling speed.

Further, the treatment tank may be made of iron or concrete, and in particular, if it is made of concrete, the manufacturing cost will be extremely low. Since the treatment tank has an extremely small amount of carrier flow out compared to, for example, a conventional cylindrical tank type, wastewater can be treated stably and efficiently.

[Brief explanation of drawings]

FIG. 1A is a plan view showing an embodiment of a unit type fluid carrier biological treatment apparatus according to the present invention, and FIG. 1B
is a longitudinal sectional view of FIG. 1A, FIG. 2A is a plan view showing another embodiment of the unit type fluid carrier biological treatment apparatus according to the present invention, FIG. 2B is a longitudinal sectional view of FIG. 2A,
FIG. 3A is a longitudinal sectional view showing still another embodiment of the unit type fluid carrier biological treatment apparatus according to the present invention, FIG. 3B is a plan view of FIG. 3A, and FIG. 4A is a unit type fluidized carrier biological treatment apparatus according to the present invention. FIG. 4B is a plan view of FIG. 4A, and FIG. 5 is a longitudinal cross-sectional view showing another embodiment of the fluid carrier biological treatment apparatus, and FIG. FIG. 6 is a plan view showing an embodiment of the present invention, and FIG. 6 is a plan view showing another embodiment in which a treatment tank is added to the unit type fluid carrier biological treatment apparatus according to the present invention. 1... Processing tank, 2... Vertical falling side wall, 3...
...Overflow part, 4...Slanted wall part, 5, 5'...
...Partition wall, 6...Small partition wall, 8...Treated water reservoir, 9...
...Carrier particles.

Claims (1)

[Scope of Claims] 1. A treatment tank for circulating wastewater and a carrier formed of opposite side walls having an inclined wall portion on at least one side and both side walls consisting of opposite parallel wall portions, A settling part is formed in the treatment tank, a settling separation part is formed on the overflow side of the treatment tank for separating sludge and carriers, and an air lift part is further formed in the treatment tank by a removable partition wall. Further, the unit type flow system is characterized in that a plurality of the processing tanks can be arranged adjacently so that the side wall of the processing tank and the side wall of another processing tank are in contact with each other. Carrier biological treatment equipment. 2. The inclined wall part for circulating and settling the carriers floating through the air lift part is inclined at an angle of 50 degrees or more, and the sedimentation separation part is provided with a small partition wall hanging above the inclined wall part. The unit type fluid carrier biological treatment device according to claim 1, characterized in that the unit type fluid carrier biological treatment device is formed.