JPH0824915B2 - Septic tank - Google Patents

Description

TECHNICAL FIELD The present invention relates to a septic tank.

[Conventional technology and its problems]

2. Description of the Related Art Conventionally, as a septic tank for purifying wastewater containing organic sludge such as human waste, there is a system combining an anaerobic filter bed and contact aeration.

Conventionally, this type of septic tank has a sewage inlet at one end,
An anaerobic filter bed chamber, a contact aeration chamber, a precipitation chamber, and a disinfection chamber are provided in this order from the sewage inlet to the treated water outlet in the treatment tank with the treated water outlet at the other end. There is.

In the septic tank having the above structure, sewage is first supplied to the anaerobic filter bed chamber to anaerobically treat organic pollution in the sewage water in the anaerobic filter bed chamber, and then to aerobically treat the sewage in the contact aeration chamber. I have to.

However, in the septic tank having the above structure, since a large amount of sewage is supplied to the anaerobic filter bed together with the organic sludge, the treatment efficiency of the organic sludge is poor, and therefore the organic sludge may flow into the contact aeration chamber. there were.

In addition, since the amount of sewage generated changes depending on the season and morning and evening, the amount of inflow into the anaerobic filter chamber also changes constantly.

Therefore, conventionally, it has been necessary to considerably increase the capacity of the anaerobic filter bed chamber in preparation for fluctuations in the flow rate.

Also, if there is a flow rate fluctuation in the anaerobic filter chamber, the amount of sewage flowing into the next contact aeration chamber also changes,
The capacity of the contact aeration chamber must also be increased in preparation for flow rate fluctuations.

Therefore, the conventional septic tank has a problem that the size of the entire processing tank becomes large.

In addition, fluctuations in the flow rate of sewage flowing into the anaerobic filter bed chamber and the contact aeration chamber directly lead to load fluctuations in each room.Therefore, when there is a large amount of flow, the treatment of organic sludge in the anaerobic filter bed chamber is not possible. There is also a problem that the organic sludge flows into the contact aeration chamber insufficiently or a short circuit phenomenon occurs in the contact aeration chamber, resulting in insufficient treatment of the wastewater to obtain stable treated water.

Therefore, the present invention is intended to provide a septic tank which has good treatment efficiency of sewage, can obtain stable treated water, and can reduce the size of the entire treatment tank as compared with the conventional one.

[Means for solving problems]

In order to solve the above problems, the present invention provides a wastewater inlet at one end and a treatment tank having an outlet at the other end,
In a septic tank in which an anaerobic filter bed chamber, a contact aeration chamber, a precipitation chamber and a disinfection chamber are sequentially installed, a flow rate adjustment chamber is provided between the anaerobic filter bed chamber and the sewage inlet in the treatment tank. Install a solid-liquid separator that removes the organic sludge in the wastewater, supply the organic sludge removed by this solid-liquid separator to the anaerobic filter chamber, and remove the organic sludge by the solid-liquid separator. This sewage is supplied to the measuring chamber provided between the flow rate adjustment chamber and the contact aeration chamber, and a fixed amount supply device is installed in this measuring chamber, and this fixed amount supply device measures the amount of sewage in the measurement chamber to the contact aeration chamber. The sludge in the contact aeration chamber was supplied and returned to the anaerobic filter chamber, and the treated water in the anaerobic filter chamber was returned to the flow control chamber.

[Action]

In the septic tank having the above structure, the waste water is temporarily stored in the flow rate adjusting chamber before being supplied to the anaerobic filter bed chamber and the contact aeration chamber. Not transmitted to the filter bed and contact aeration chambers.

In addition, solid-liquid separation is performed in the flow control chamber, the organic sludge in the wastewater is supplied to the anaerobic filter chamber, and the wastewater from which the organic sludge has been removed is supplied to the contact aeration chamber. Sewage mixed with sludge is efficiently treated.

Further, the contact aeration chamber is supplied with a fixed amount of sewage by a fixed amount supply device, so that there is no load fluctuation.

Further, the separation sludge in the contact aeration chamber is returned to the anaerobic filter bed chamber, and the treatment liquid in this anaerobic filter bed chamber is returned to the flow rate adjustment chamber, so that the wastewater is repeatedly treated and a stable treatment liquid is obtained. can get.

〔Example〕

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

The septic tank of the present invention basically has a treatment tank 1 provided with a wastewater inlet 2 at one end and a wastewater outlet 3 at the other end,
From the sewage inflow port 2 side to the sewage outflow port 3 side, a flow rate adjusting chamber 4, an anaerobic filter chamber 5, a contact aeration chamber 6, a precipitation chamber 7 and a disinfection chamber 8 are sequentially provided, and the anaerobic filter chamber 5 is installed. A measuring chamber 9 is provided between the flow rate adjusting chamber 4 on one side and the contact aeration chamber 6.

An air diffuser 10 is installed at the bottom of the flow rate adjusting chamber 4,
The diffuser 10 agitates the waste water in the flow rate adjusting chamber 4.

The flow rate adjusting chamber 4 and the measuring chamber 9 communicate with each other through an opening 11 provided in a predetermined width in the upward direction, and the flow rate adjusting chamber 4 and the measuring chamber 9 are at the same water level.

A solid-liquid separator 12 is installed in the opening 11. This solid-liquid separation device 12 is an endless flocked filter cloth 14 wound around rotating rollers 13 and 13 'installed below and above the opening 11, and attached to the surface of this flocked filter cloth 14. It is composed of a cleaner 15 for scraping off the kimono, the surface of the flocked filter cloth 14 on the side of the flow rate adjusting chamber 4 closes the opening 11, and the waste water in the flow rate adjusting chamber 4 passes through the flocked filter cloth 14. The organic sludge that flows into the measuring chamber 9 and is mixed in the wastewater adheres to the surface of the flocked filter cloth 14. Of the rotating rollers 13 and 13 ', the upper rotating roller 13 is a motor.
The flocked filter cloth 14 side that is rotated by 16 and closes the opening 11 is moving upward from below. The cleaner 15 is rotatably installed above the anaerobic filter bed chamber 5 by the motor 16 so as to drop the organic sludge adhering to the flocked filter cloth 14 into the anaerobic filter bed chamber 5.

Next, a fixed amount supply device 17 is installed in the measuring chamber 9. This quantitative supply device 17 comprises a measuring container 19 having an inflow port 18 on its upper surface, a float valve 20 floating in water for closing the inflow port 18 housed in the measuring container 19, and the measuring container 19 described above.
An air supply pipe 22 for supplying air through an opening / closing valve 21 such as a solenoid valve and a discharge pipe 23 having a lower end inserted into the bottom portion of the measuring container 19 are formed. The weighing container 19 is
It is installed at the bottom of the measuring chamber 9, and the upper end of the discharge pipe 23 is located above the contact aeration material 6. In order to supply a fixed amount of dirty water in the measuring chamber 9 to the contact aeration chamber 6 by the constant amount supply device 17, the following is performed. First, the open / close valve of the air supply pipe 22
When 21 is closed and the supply of air into the measuring container 19 is cut off, the float valve 20 is pushed downward by water pressure,
When sewage flows into the measuring container 19 through the inlet 18 and the measuring container 19 is filled with sewage, the float valve 20 floats by buoyancy to close the inlet 18. In this way, in the state where the measuring container 19 is filled with dirty water, next, the on-off valve 21 of the air supply pipe 22
When opened, air is sent from the air supply pipe 22 into the measuring container 19, the pressure inside the measuring container 19 rises, and the float valve 20 is pressed against the inflow port 18 by this pressure increase, and at the same time the air pressure causes the measuring container 19 to move. The sewage inside rises the discharge pipe 23,
Sewage flows into the contact aeration chamber 6. After this, the weighing container 19
When the on-off valve 21 is closed after the transfer of the dirty water in the
The air supply from the air supply pipe 22 is cut off, which lowers the pressure in the measuring container 19, and the air pressure causes the inlet 18 to flow.
The float valve 20 that closed the valve lowers, and sewage flows into the measuring container 19 through the inflow port 18. As a result, the air supply pipe 22
If the on-off valve 21 of is operated intermittently by a timer,
The sewage in the measuring chamber 9 can be supplied to the contact aeration chamber 6 quantitatively.

Below the inflow port 18 in the measuring container 19, the measuring container 19
A net body 24 is stretched to receive the float valve 20 so that the float valve 20 does not drop to the bottom of the measuring container 19 when the sewage therein is discharged and the pressure in the measuring container 19 is reduced.

An air diffuser pipe 25 is provided at the bottom of the contact aeration chamber 6, and an air supply pipe 26 of the air diffuser pipe 25 is connected to the fixed amount supply device 17 described above.
It is provided so as to be branched from the air supply pipe 22. A backwash pipe 28 is branched from the air supply pipe 26 of the air diffuser 25 via a backwash cock 27, and the tip of the backwash pipe 28 is located at the bottom of the contact aeration chamber 6. is set up.

A wall 29 for partitioning the contact aeration chamber 6 and the anaerobic filter bed chamber 5
An advection port 30 for returning sewage in the contact aeration chamber 6 and stripped sludge from backwashing to the anaerobic filter bed chamber 5 is formed in the upper part of the.

A return port 32 for returning the treated water in the anaerobic filter bed chamber 5 to the flow rate adjusting chamber 4 is formed in the upper part of the wall 31 that partitions the anaerobic filter bed chamber 5 and the flow rate adjusting chamber 4. This return port 32
Also serves as a cleaning port for the anaerobic filter bed chamber 5. Further, in the anaerobic filter bed chamber 5, a baffle 33 is installed to prevent the organic sludge dropped by the cleaner 15 and the stripped sludge returned from the advection port 30 from floating toward the return port 32. .

An opening 35 is formed at the bottom of the wall 34 that separates the contact aeration chamber 6 and the precipitation chamber 7, and the contact aeration chamber 6 and the precipitation chamber 7 communicate with each other through the opening 35, and the contact air is passed through the opening 35. The treated water in the air chamber 6 flows into the settling chamber 7, and the sludge deposited in the settling chamber 7 is returned to the contact aeration chamber 6.

The disinfection chamber 8 is formed above the precipitation chamber 7,
An overflow jet 37 is formed on the upper part of the wall 36 that separates the precipitation chamber 7 from the precipitation chamber 7, and the supernatant liquid on the upper part of the precipitation chamber 7 flows into the disinfection chamber 8 through the medicine barrel 38 of the disinfection chamber 8. Further, baffles 39 and 39 'are provided in the upper part of the precipitation chamber 7 so as to face each other, and the disinfection chamber 8 is provided between the facing baffles 39 and 39'.
Is provided so that the suspended matter in the precipitation chamber 7 does not flow into the disinfection chamber.

Next, a processing flow of the septic tank having the above structure will be described.

Sewage mixed with organic sludge such as human waste first flows into the flow rate adjusting chamber 4.

The sewage flowing into the flow rate adjusting chamber 4 passes through the flocked filter cloth 14 and enters the measuring chamber 9, and the organic sludge in the sewage adheres to the flocked filter cloth 14 and is removed.

Then, the sewage in the measuring chamber 9 from which the organic sludge has been removed by passing through the flocked filter cloth 14 is quantitatively supplied to the contact aeration chamber 6 by the quantitative supply device 17 and aerobically treated.

On the other hand, the organic sludge removed by the flocked filter cloth 14 is pulled up to scrape off the flocked filter cloth 14.
Dropped into anaerobic filter chamber 5 by 15 and anaerobic filter chamber 5
The anaerobic treatment is carried out, and the treated liquid is returned to the flow rate adjusting chamber 4 again from the return port 32.

In addition, a part of the backwashing-separated sludge and wastewater in the contact aeration chamber 6 is returned to the anaerobic filter bed chamber 5 from the advection port 30.

Next, the treated water treated in the contact aeration chamber 6 flows into the precipitation chamber 7, is sterilized in the disinfection chamber 8, and is discharged from the wastewater outlet 3.

The sludge settling on the bottom of the settling chamber 7 is appropriately contacted with the aeration chamber 6
Will be returned to.

〔The invention's effect〕

As described above, the septic tank of the present invention is a wastewater obtained by first inflowing sewage into the flow rate adjusting chamber for solid-liquid separation, treating the organic sludge in the sewage in the anaerobic filter bed chamber, and removing the organic sludge. Since the quantity of wastewater is treated quantitatively in the contact aeration chamber, fluctuations in the flow rate of wastewater are not transmitted to the anaerobic filter bed and the contact aeration chamber, and wastewater containing organic sludge is efficiently treated.

Therefore, according to the present invention, there is an effect that the size of the entire processing tank can be made considerably smaller than the conventional size.

Also, the separation sludge in the contact aeration chamber is returned to the anaerobic filter bed chamber, and the treatment liquid in this anaerobic filter bed chamber is returned to the flow rate adjustment chamber, so the wastewater is repeatedly treated and a stable treatment liquid is obtained. There is also the effect of being able to be.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the septic tank of the present invention, FIG. 2 is a plan view of the same as above, and FIG. 1 ... Treatment tank, 2 ... Sewage inlet, 3 ... Sewage outlet,
4 ... Flow rate adjusting chamber, 5 ... Anaerobic filter chamber, 6 ... Contact aeration chamber, 7 ... Precipitation chamber, 9 ... Measuring chamber, 2 ... Solid-liquid separation device, 17 ... Fixed amount supply device .

Claims (1)

[Claims] 1. A septic tank in which a sewage inlet is provided at one end and a treated water outlet is provided at the other end, and a anaerobic filter chamber, a contact aeration chamber, a precipitation chamber and a disinfection chamber are sequentially provided in the treatment tank. A flow rate adjustment chamber is provided between the anaerobic filter bed chamber and the wastewater inlet in the treatment tank, and a solid-liquid separator for removing organic sludge in the wastewater is installed in this flow rate adjustment chamber. The removed organic sludge is supplied to the anaerobic filter chamber, and the wastewater from which the organic sludge has been removed by the solid-liquid separation device is supplied to the measuring chamber provided between the flow rate adjusting chamber and the contact aeration chamber. A fixed quantity supply device is installed in the measuring chamber, and this fixed quantity supply device quantitatively supplies the wastewater in the measuring chamber to the contact aeration chamber, and returns the separated sludge from the contact aeration chamber to the anaerobic filter bed, and the anaerobic filter bed. A septic tank characterized by returning treated water from the chamber to the flow control chamber.