JPH10323680A - Aerobic immersion filter bed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce troublesome cleaning and washing work by discharging sludge adhering on a filter bed to a downstream side by removing the sludge from the bed in a treatment wherein waste water containing organic substances are subjected to an aerobic treatment with biological sludge deposited on the filter bed immersed within a treatment tank. SOLUTION: When a waste water containing organic substance such as feces, air is jetted into an aeration treatment tank 1 through an aeration tube 3 in order to carry out aeration of an interior of the treatment tank 1 and a blower 4 is operated for causing convection within the treatment tank 1 and the waste water containing organic substance is circulated to a filter bed 2 for the purpose of carrying out purification treatment by use of biological sludge deposited on the filter bed 2. A backwash blower 6 is automatically operated at a predetermined interval in order to remove sludge adhering on the filter bed 2 by air jetted from a backwash nozzle toward the filter bed 2 at a periodic interval. The removed sludge is recirculated and dispersed into the treatment tank 1 sequentially and discharged to, for example, a sewerage system. Thus, the filter bed 2 is automatically prevented from being clogged so that purification function of the filter bed 2 can be kept in a good state for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerobic immersion filter bed apparatus.

[0002]

2. Description of the Related Art Conventionally, as shown in a schematic diagram of FIG. 6, a wastewater containing organic matter such as garbage or stool flows into a treatment tank 1 and is immersed in the treatment tank 1. There is a wastewater treatment device for purifying the wastewater with the biological sludge attached to the treatment tank 2. A diffuser 3 is provided at the bottom of the treatment tank 1, and a blower 4 is connected to the diffuser 3 via a valve 51. Aeration is always performed from the air diffuser 3, oxygen is supplied to the aerobic bacteria attached to the filter bed 2, and convection is formed in the treatment tank 1 by the aeration. A backwash nozzle 5 disposed on the bottom side of the filter bed 2 is connected to the blower 4 via a manual valve 52. When the amount of sludge adhering to the filter bed 2 becomes excessive, the filter bed 2 is formed. In the prior art, the manual valve 5 Regularly open, this time valve 51
Is closed, and air is blown out from the backwash nozzle 5 to the filter bed 2 to remove sludge adhering to the filter bed 2.
In the past, it was necessary to manually wash the filter bed 2, and the sludge separated from the filter bed 2 had to be separately removed and cleaned.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an aerobic immersion filter bed apparatus which can reduce complicated washing and cleaning operations. The first object of the present invention is to provide an aerobic immersion filter apparatus for aerobically treating wastewater containing organic matter with biological sludge attached to a filter bed immersed in a treatment tank, wherein the sludge attached to the filter bed is provided. Is separated and discharged to the downstream side. A second gist is that the sludge is automatically and periodically peeled off. The third point is that aeration is performed on the downstream side of the aerobic immersion filter bed device if the discharged water quality is within the water quality standard, and if the discharged water quality is out of the water quality standard, the aeration is stopped to perform solid-liquid separation for SS. That is, a solid-liquid separation tank was provided.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an aerobic immersion filter bed apparatus of a first embodiment. A filter bed 2 is immersed in a treatment tank 1, and the filter bed 2 has a honeycomb shape, a corrugated shape, or a mesh shape. Etc., and biological sludge adheres to the filter bed 2 to purify wastewater under aerobic conditions.
A diffuser 3 connected to a blower 4 is provided at the bottom of the treatment tank 1, and a plurality of backwash nozzles 5, 5, 5 are provided at the bottom of the filter bed 2. Each of the backwash nozzles 5, 5, 5 is connected to a backwash blower 6.

In such a configuration, the blower 4 is always operated, and air is blown out from the diffuser tube 3 to perform aeration in the processing tank 1, and the air blown out from the diffuser tube 3 enters the processing tank 1. Convection as shown in the figure is formed, and wastewater containing organic matter flowing into the treatment tank 1 is circulated to the filter bed 2 satisfactorily, and is purified by biological sludge adhering to the filter bed 2. Then, the treated water is sequentially discharged to the downstream side.

In the present embodiment, the backwash blower 6 is automatically operated periodically to allow the backwash nozzle 5 to pass through the filter bed 2.
Air is automatically and periodically ejected toward the filter bed, and the ejected air is configured to separate sludge adhering to the filter bed 2. The separated sludge is circulated and dispersed in the treatment tank 1 sequentially. , On the downstream side, for example, into the sewer.

The time for automatically operating the backwash blower 6 is controlled within a reference range of treated water quality. That is, for example, when the water quality standard of the effluent from the treatment tank 1 is set to 300 mg / liter BOD and 300 mg / liter SS, when wastewater containing 1000 mg / liter BOD of organic matter flows into the treatment tank 1, In 1, the 1000 mg / liter BOD wastewater flowing in through the biological treatment in the filter bed 2 is decomposed into CO ² and H ₂ O and 700 mg / liter is treated, of which 70% / 70% is S
Since the 70 mg / liter SS adheres to the filter bed 2 and gradually closes the filter bed 2, the backwash blower 6 is automatically and periodically operated, and the 70 mg / liter SS If the generated SS is controlled to be separated and discharged to the downstream side, the filter bed 2 will not be blocked and a good processing function can be maintained.

Accordingly, the amount of SS to be stripped can be controlled by controlling the operation time of the backwashing blower 6 and the like, so that it is necessary to perform the conventional manual backwashing. In addition, there is no need to perform a cleaning operation for pulling out the separated sludge, and the treatment capacity can be maintained satisfactorily.

Next, FIG. 2 shows a second embodiment. In FIG. 2, a filter bed 2 is immersed in a treatment tank 1.
An air diffuser 3 is disposed on the bottom side of the treatment tank 1, and a diffuser 7 is connected to the diffuser 3, and an automatic opening / closing valve 8 that opens and closes automatically is provided in the diffuser 7. And blower 4
The backwashing pipe 9 is connected to a plurality of backwashing nozzles 5 arranged on the bottom side of the filter bed 2. Is provided with an automatic opening / closing valve 10 that opens and closes automatically, and a backwash pipe 9 is connected to the blower 4.

In such a configuration, the automatic opening / closing valve 8 is always opened and air is blown out from the air diffuser 3 to be aerated, but the automatic opening / closing valve 10 is automatically opened periodically. Air is blown from the backwash nozzle 5 through the backwash pipe 9 to the filter bed 2 to separate sludge adhering to the filter bed 2, and the automatic opening / closing valve 10 is opened. The automatic opening and closing valve 8 is configured to be closed when the
The automatic opening / closing valve 10 can be controlled to open and close the filter bed 2 by controlling the amount of wastewater flowing into the processing tank 1 and the amount of SS generated by processing in the processing tank 1. And the amount of SS generated by the treatment adhering to the filter bed 2 can be sequentially controlled by the automatic opening / closing valve 1.
0 is automatically opened and closed to peel off and remove, and the amount of sludge adhering to the filter bed 2 is controlled to an appropriate level to prevent the filter bed 2 from being clogged.
Can be favorably maintained. Therefore, it is possible to omit the conventional manual cleaning or cleaning as in the related art.

Next, FIG. 3 shows a third embodiment, in which a backwash nozzle 5 is provided below the filter bed 2 immersed in the treatment tank 1. Is connected to a blower 6, and an automatic relief valve 11 is provided. In the configuration of FIG.
Is normally operated with a small air volume to operate the backwash nozzles 5, 5, 5
And air is supplied to the filter bed 2 and the amount of air is such that convection occurs in the treatment tank 1. However, when the SS adhering to the filter bed 2 is separated, the air volume of the blower 6 is increased. Air bubbles are ejected from the backwash nozzle 5 toward the filter bed 2 to separate the SS, and the blower 6 is automatically and periodically switched to the large airflow for backwash. Things. In such a configuration, the aeration blower 4 and the diffuser 3 can be omitted separately, and the apparatus in the processing tank can be simplified and formed compact.

Next, FIG. 4 shows a fourth embodiment, in which the processing tank 1 and its internal device are the same as those in FIG. 1, but a solid-liquid separation tank is provided downstream of the processing tank 1. The solid-liquid separation tank 12 is configured to receive the processing water from the processing tank 1, and a diffuser 13 is provided at a lower portion in the solid-liquid separation tank 12. A blower 14 is connected to 13. The blower 14 is always operated to aerate from the air diffuser 13, and the solid-liquid separation tank 12
The water is discharged from the upper surface side to sewage or the like. If the quality of the discharged water is within the water quality standard, aeration is performed from the diffuser 13 as shown in FIG. If the quality of the treated water entering the separation tank 12 is out of the water quality standard, the operation of the blower 14 is stopped and the aeration from the diffuser 13 is stopped as shown in FIG. 12
The solid-liquid separation is performed in the inside, the SS component is settled at the bottom side of the solid-liquid separation tank 12, and the discharged water discharged from the solid-liquid separation tank 12 is processed so as to meet the water quality standard. That is, it is conceivable that the water discharged from the treatment tank 1 is out of the water quality standard due to drainage and load inflow exceeding the planned values. In such a case, as shown in FIG. The solid component is separated to settle the SS component, and the SS component stored in the solid-liquid separation tank 12 is sent out by cleaning or drawing.

[0013]

According to the present invention, there is provided an aerobic immersion filter apparatus for aerobically treating wastewater containing organic matter with biological sludge attached to a filter bed immersed in a treatment tank. By being configured to be separated and discharged to the downstream side, the sludge generated by the treatment in the treatment tank is separated and the separated sludge is maintained on the downstream side while maintaining the water quality within the treated water quality standard range. And the amount of sludge adhering to the filter bed is made constant, thereby preventing the filter bed from being clogged.

Further, the sludge is automatically and periodically peeled off, so that excess sludge adhering to the filter bed is periodically and automatically peeled off by backwashing and the like, and the sludge is treated in the treatment tank. Can be automatically discharged sequentially and periodically to prevent clogging of the filter bed,
This has the effect that the purification function of the filter bed can be maintained well.

Further, downstream of the aerobic immersion filter bed apparatus, aeration is performed if the discharged water quality is within the water quality standard, and if the discharged water quality is out of the water quality standard, aeration is stopped to perform solid-liquid separation for SS. By providing a separation tank, in an emergency such as when effluent water out of the water quality standard range is discharged from the aerobic immersion filter bed device, the SS content is satisfactorily removed in the solid-liquid separation tank to clear the water quality standard It can be discharged water and has the effect of favorably assisting the purification function of the aerobic immersion filter bed device through the solid-liquid separation tank.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an aerobic immersion filter bed device of a first embodiment.

FIG. 2 is a schematic configuration diagram of an aerobic immersion filter bed device of a second embodiment.

FIG. 3 is a schematic configuration diagram of an aerobic immersion filter bed device of a third embodiment.

FIG. 4 is a schematic configuration diagram in a state where a solid-liquid separation tank is further installed on the downstream side.

FIG. 5 is a schematic configuration diagram for performing solid-liquid separation of SS in a solid-liquid separation tank.

FIG. 6 is a schematic configuration diagram of a conventional aerobic immersion filter bed device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 treatment tank 2 filter bed 3 diffuser 4 blower 5 backwash nozzle 6 backwash blower 8,10 automatic open / close valve 12 solid-liquid separation tank 13 diffuser 14 blower

Claims (3)

[Claims] 1. An aerobic immersion filter apparatus for aerobically treating wastewater containing organic matter with biological sludge attached to a filter bed immersed in a treatment tank. An aerobic immersion filter bed device configured to be discharged to the side. 2. The aerobic immersion filter bed apparatus according to claim 1, wherein the sludge is automatically and periodically peeled off. 3. A solid-liquid separator for downstream of the aerobic immersion filter bed apparatus, wherein aeration is performed if the discharged water quality is within the water quality standard, and aeration is stopped if the discharged water quality is out of the water quality standard to perform solid-liquid separation for SS. The aerobic immersion filter bed device according to claim 1 or 2, further comprising a separation tank.