JPH06142689A - Purifying device for sewage of intermittent aeration type - Google Patents

Abstract

PURPOSE:To obtain the purifying device for sewage of an intermittent aeration type for decreasing an equipment burden of an aeration device to half, while setting aeration to sewage in an aeration tank, executed by the aeration device provided in an aeration tank, to a form of aeration, in which an aeration process and a non-aeration process are repeated alternately. CONSTITUTION:Two or more aeration tanks 3 are installed in parallel, and in those aeration tanks 3, a diffusing tube 42 allowed to communicate through a feed air tube 41 with a discharge port of an air blower 40 for discharging pressure air of an aeration device 4 is distributed and provided at every aeration tank 3, and in a conduit line between the discharge port of the air blower 40 and the diffusing tube 42, control valve devices V1, V2 for controlling so that the diffusing tubes 42 distributed at every aeration tank 3 are switched alternately and allowed to communicate at every aeration tank 3 against the discharge port of the air blower 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for purifying sewage using an activated sludge method, which aerates sewage containing organic substances such as domestic wastewater and industrial effluent in an aeration tank to grow activated sludge for treatment. The present invention relates to improvement of an intermittent aeration type sewage purification device that denitrifies in a non-aeration anaerobic state process between aeration strokes by intermittently operating an aeration device provided in an aeration tank.

[0002]

2. Description of the Related Art The purification treatment of wastewater containing organic substances is usually
It is carried out by the treatment means by the activated sludge method. This sewage treatment means puts sewage in an aeration tank, and aerates it with an aeration device to grow activated sludge, so that BOD, C
It is a means of removing OD, exhibits excellent performance, and has many installation records.

[0003] Further, in the purification treatment means for wastewater by the activated sludge method, the aeration apparatus has been operated continuously so that the aeration operation is continuous, but the aeration operation is performed intermittently. In the non-aerated anaerobic state process between the aeration process and the aeration process, nitrogen contained in the wastewater is released as nitrogen gas, and denitrification of about 50 to 90% can be obtained. I understand.

From this, as shown in FIG. 1, the aeration tank 3 for receiving the sewage fed from the inflow pipe 1,
An aerator 4 comprising an air blower 40 for sending air under pressure, an air supply pipe 41, an air diffuser pipe 42, and the like is assembled, and by the operation of the aeration device, sewage is grown into activated sludge for purification treatment,
A control panel 8 for constructing a sewage purification device by the activated sludge method so that the supernatant liquid is sent to the settling tank 5 and taken out through the outflow pipe 6 and discharged, and for controlling the operation of the aeration device 4 thereof, Intermittent operation of this aeration device 4 by incorporating a program or by detecting the oxidation-reduction potential of wastewater in the aeration tank 3 with an oxidation-reduction potential meter (ORP meter) and controlling it with the detection signal Means for constructing the aeration-type wastewater purification apparatus A have been developed.

[0005]

The intermittent aeration type sewage purification device A operates the aeration device 4 because the operation of the aeration device 4 for aerating the sewage in the aeration tank 3 is intermittently operated. When the non-aeration process is stopped by stopping the aeration device 4, the aeration device 4 itself is idled. Therefore, if the aeration and non-aeration processes are distributed at the same time, half of the operation There is a problem that the aeration device 4 becomes an idle facility at the time of, and causes a loss in equipment cost.

[0006]

[PROBLEMS] The present invention has been made to solve the above-mentioned problems. Aeration of sewage in the aeration tank 3 performed by an aeration device 4 provided in the aeration tank 3 is performed in an aeration process and a non-aeration process. It is an object of the present invention to provide a new means for configuring an intermittent aeration type sewage purification device A that reduces the equipment load of the aeration device 4 by half while adopting a mode of intermittent aeration in which and are alternately repeated.

[0007]

In the present invention, as means for achieving the above-mentioned object, two or more aeration tanks are installed in parallel, and the compressed air of the aeration device is placed in these aeration tanks. Distributor pipes that communicate with the discharge port of the blower through the air pipe are distributed and installed for each aeration tank, and distributed for each aeration tank in the pipe line between the discharge port of the blower and the air diffusion pipe. The present invention proposes an intermittent aeration type sewage purification device, which is provided with a control valve device for controlling the air diffuser to alternately communicate with the discharge port of the blower for each aeration tank.

[0008]

Embodiments Next, embodiments will be described in detail with reference to the drawings. The same reference numerals are used for the constituent members having the same effects as those of the conventional means.

FIG. 2 is a longitudinal side view showing an intermittent aeration type sewage purification apparatus A according to the present invention. In the figure, 1 is a sewage inflow pipe, and 3 and 3 are aeration tanks arranged in parallel. 4.4
Is an aeration device incorporated in each aeration tank 5, 5 is a precipitation tank, 6 is an outflow pipe for discharging supernatant water, 7 is a stirring device, 8 is a control panel,
V1 and V2 indicate control valve devices.

The aeration tanks 3 and 3 are connected in series. Then, in each aeration tank 3, a blower 40 that discharges compressed air such as a compressor or a compressed air blower from a discharge port.
And an aeration device 4 including an air supply pipe 41 that guides compressed air and an air diffusion pipe 42 that blows out air. The aeration devices 4 are distributed to each aeration tank 3 and installed. 42 is connected to the air supply pipe 41 ..
The blower 40 is commonly used by connecting the blower 40 to a branch pipe connected to the discharge port 400 of the blower 40.

Further, the air supply pipe 41 of each aeration device 4 ...
.. are connected to control valve devices V1 and V2 for on / off controlling the communication with the discharge port 400 of the blower 40, respectively. By alternately opening and closing the control valve devices V1 and V2, The aeration operation in the aeration tanks 3 and 3 is made to be intermittent aeration by alternately repeating the aeration process and the non-aeration process.

The control for making the aeration in each of the aeration tanks 3 ... Intermittent aeration is performed by operating the blower 40 of the aeration device 4 continuously so that a timer provided in the control panel 8 or According to the program, one of the control valve devices V1 and V2 may be sequentially switched and opened to open at the same time, and the other control valve devices may be closed at the same time. The operation of the blower 40 may be performed in combination with a means for intermittent operation.

That is, as shown in FIG.
Is operated so as to operate intermittently in a cycle in which an operation of a constant operation time T1 and a constant stop time T2 are repeated alternately, and the aeration stroke time zones Z1 and Z in the aeration tanks 3 and 3, respectively.
2 so as to occupy different time zones in the operating time T1 of the blower 40, respectively.
The operation of No. 2 is switched and controlled. Thus, during the operation process of the blower 40 of the aeration device 4 which operates intermittently, the blower 40 can be shared and the aeration operation in each aeration tank 3 can be performed.

Reference numeral 9 denotes an aeration tank 3 for aeration sludge provided in the precipitation tank 5.
・ It is a return pipe returned to the foremost part of 3.

Next, FIG. 4 shows another embodiment. In this embodiment, the aeration tanks 3 and 3 arranged in parallel in the above-mentioned embodiment are used.
In this example, the aeration tanks 3 and 3 arranged in parallel are arranged in parallel, and they are connected in parallel to the measuring tank 2. The rest of the configuration is the same as that of the above-described embodiment, and operates similarly to the above-described embodiment. The metering tank 2 has a function of dividing the sewage flowing in from the inflow pipe 1 into equal amounts and sending the same to the aeration tanks 3/3.

[0016]

As described above, the intermittent aeration type sewage treatment apparatus according to the present invention is provided with two or more aeration tanks 3 arranged in parallel, and each aeration apparatus is equipped with these aeration tanks 3. 4 is configured to share the blower 40 that discharges the compressed air, and the aeration operation in each aeration tank 3 is performed at a different timing for each aeration tank 3, so that the common blower 40 is used. The aeration operation of each aeration tank can be intermittently aerated in the state of continuous operation, and the aeration device 4 provided in the aeration tank 3 performs aeration of the waste water in the aeration tank 3 for the aeration process and the non-aeration process. Aerating device 4 in the form of intermittent aeration in which and alternate alternately.
Intermittent aeration type sewage purification device A that halves the equipment burden of
Will be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a conventional intermittent aeration type sewage purification device which has been developed.

FIG. 2 is a developed vertical sectional side view of the intermittent aeration type wastewater purification device according to the present invention.

FIG. 3 is an explanatory diagram of a process of aeration and non-aeration of the above apparatus.

FIG. 4 is a schematic plan view of another embodiment of the same device.

[Explanation of symbols]

A ... Purification device, V1 and V2 ... Control valve device, T1 ... Operating time, T2 ... Stop time, Z1 / Z2 ... Time zone, 1 ... Inflow pipe, 2 ... Metering tank, 20 ... Outflow port, 21 ... Piping, 3 ... Aeration tank, 4 ... Aeration device, 40 ... Blower, 400 ... Discharge port, 4
1 ... Air supply pipe, 42 ... Air diffusion pipe, 5 ... Precipitation tank, 6 ... Outflow pipe,
7 ... Stirring device, 8 ... Control panel, 9 ... Return pipe.

Claims (2)

[Claims] 1. Two or more aeration tanks are installed in parallel, and in each of the aeration tanks, an air diffuser communicating with the discharge port of a blower for discharging the compressed air of the aeration device through the air supply pipe is provided for each aeration tank. Installed in a distributed manner, so that the diffuser pipes distributed for each aeration tank are switched to communicate with the discharge port of the blower alternately in the pipe line between the discharge port of the blower and the diffuser pipe. An intermittent aeration type sewage purification device, which is provided with a control valve device for controlling. 2. Two or more aeration tanks equipped with an aeration device including a blower for discharging compressed air, an air supply pipe for guiding the compressed air, and an air diffuser pipe for blowing out air, and two or more aeration tanks are arranged in parallel, and the aeration operation in these aeration tanks Is controlled by a program installed in the control panel so that the aeration process in each aeration tank is located at a different time zone, the air blower of the aeration device of each aeration tank is shared, and the aeration tank of each aeration tank is connected via the switching valve device. An intermittent aeration type sewage purification device characterized by being connected to an air diffuser of an aeration device.