JPH091170A - Power saving type septic tank - Google Patents

Abstract

PURPOSE: To save electric power to be used by a blasting device by providing the above septic tank with a utilization degree detecting means for detecting the data on the number of users during the utilization of facilities and supplying the air of the quantity based on the detected data from the blasting device to the septic tank. CONSTITUTION: A control circuit 24 is so constituted that the circuit is capable of dealing with any of an electric power sensor 21, an illumination switch-on number counter 21A, a waterline flow meter 22 and a number-of-person counter 23. The circuit is composed of electronic circuits mainly consisting of a programmable controller and a microcomputer. A driving circuit 25 is connected to the control circuit 24. The driving circuit 25 receives the electric power supply from a commercial power source in accordance with the signal from the control circuit 24 and drives blowers 7, 8. A CT(current transformer) constituting part of the electric power sensor 21 detects the current passing the electric lamp trunk of a hotel and the signal outputted from the CT is subjected the signal conversion by a transducer in the electric power sensor 21 and is further inputted to a meter relay.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank for treating sewage in a facility, and changes the amount of air supplied from a blower such as a blower according to the number of facility users and the amount of sewage inflow. Therefore, when the number of facility users is small, the present invention relates to a power-saving septic tank in which the amount of air used for the septic tank is reduced to reduce the amount of electric power used by a blower such as a blower.

[0002]

2. Description of the Related Art Conventionally, in facilities such as hotels, theaters, gathering facilities, gymnasiums, and stadiums, the number of people who use them varies greatly depending on the season, the day of the week, and the time of day. Therefore, the amount of sewage at the facility also fluctuates significantly, but the size of the septic tank that treats the sewage and the blower installed for aeration are designed based on the maximum number of users of the facility. It
Further, the blower installed in the septic tank is continuously operated at full power even when the flow rate of the sewage flowing into the septic tank is small.

[0003]

In the above-described conventional septic tank, the blower installed in the septic tank is continuously operated at full power regardless of the amount of inflowing wastewater. There is a problem in that more air than necessary is supplied and power is consumed more than necessary. Therefore, in the present invention, when the number of users is small, the amount of air is adjusted by adjusting the amount of air from a blower such as a blower installed in the septic tank according to the number of users at the present time of the facility. The problem to be solved is to reduce power consumption by reducing the power consumption of the blower.

[0004]

In order to solve the above-mentioned problems, the present invention provides a septic tank for treating wastewater in a facility by supplying air from a blower device driven by receiving power supply. A utilization degree detecting means for detecting data relating to the number of users who are using the air conditioner, and a control means for causing the air blower to deliver an air amount based on the data detected by the utilization degree detecting means. That is.

[0005]

According to the power-saving septic tank having the above structure, when the utilization detecting means detects the data relating to the number of people who are currently using the facility, the control means is based on the data. Since the air volume is controlled to be sent from the air blower, when the number of facility users is small, the amount of electric power used by the air blower is automatically reduced, so that power saving is realized.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan cross-sectional view of a combined septic tank of 5000 persons installed in a hotel, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 1 and FIG. 2, in the septic tank 1, the sewage of the hotel flows in through an inflow pipe 2 installed on the left side in the drawings. Sewage is rough screen 3
It flows into the sand settling tank 4 through the flow path and flows to the next-stage flow rate adjusting tank 5 in the state where the sand is set.

A machine room 6 is provided above the flow rate adjusting tank 5, and blowers 7 and 8 are installed in the machine room 6. The blowers 7 and 8 are mainly used for the contact aeration tank No. 1
The chamber 10 and the contact aeration tank second chamber 11 are provided so as to blow air in order to supply necessary oxygen, but in addition, the air is also blown to the flow rate adjusting tank 5 and the like. Blower above
Reference numerals 7 and 8 are driven by the supply of electric power by a control circuit and a drive circuit described later, and supply an air amount based on the oxygen amount necessary for the aeration of the septic tank 1. Therefore, the output of each is 7.5 KW.

Sludge thickening tank 9A adjacent to the flow rate adjusting tank 5
From the settling tank 12 provided at the right end of the septic tank 1.
The sludge sucked up by the lift pump 12A is concentrated. The overflow of the wastewater in the sludge thickening tank 9A is returned to the flow rate adjusting tank 5. The concentrated sludge in the sludge thickening tank 9A is transferred to the adjacent sludge storage tank 9B by the air-lift pump. The sewage flowing into the flow rate adjusting tank 5 is sent to the contact aeration tank first chamber 10 and, after being aerated, sent to the contact aeration tank second chamber 11 adjacent to the contact aeration tank first chamber 10. And is even more enthusiastic. Then, after the suspended solids are settled in the settling tank 12, the supernatant of the contacted aeration tank second chamber 11 is settled in the settling tank 12, and the supernatant is introduced into the disinfection tank 13 and is disinfected by chlorine from the chlorine sterilizer 13A. The discharge pump tank 14 is designed to flow. Since the water that has flowed into the discharge pump tank 14 is in a purified and disinfected state, it is discharged by the discharge pump 15 into a river or the like outside the hotel site or reused.

In the septic tank 1 constructed as described above, the blowers 7 and 8 are driven by a control system as shown in FIG. 3 in order to realize the power saving which is the gist of the present invention. FIG.
FIG. 3 is a block diagram of a control system for driving and controlling the blowers 7, 8. An electric power sensor 2 is used as a utilization detecting means for detecting data corresponding to the number of people who are currently using this hotel.
1, a water flow meter 22, a people counter 23, etc. are used.

The power sensor 21 is, as will be described later,
The current flowing through the electric light trunk line of the hotel is detected via CT,
The signal output from the CT is converted into a signal by a transducer or the like, and a rectangular wave signal based on the signal is converted to a meter.
It is configured to output from the relay. Further, the lighting switch ON number counter 21A counts the total number of ON lighting switches among the lighting switches provided in each room, and outputs a signal corresponding to the total number. In addition, the water flow meter 22 outputs an electric signal according to the water flow rate used in the hotel. Further, the number of people counter 23 is installed at the entrance of the hotel, counts the number of people entering and leaving the hotel, calculates the number of people in the hotel, and outputs an electric signal corresponding to the number of people.

Therefore, any one of the power sensor 21, the lighting switch ON number counter 21A, the water flow meter 22 and the people counter 23 is selected as the utilization detecting means. The control circuit 24 is configured to be compatible with any of the power sensor 21, the water flow meter 22, and the number of people counter 23, and is configured with an electronic circuit having a programmable controller or a micro computer as its core. There is.

A drive circuit 25 is connected to the control circuit 24. The drive circuit 25 uses a commercial power source, for example, a three-phase two-phase circuit, based on a signal from a control circuit 24 described later.
The blowers 7 and 8 described above are driven by receiving electric power from a 00 volt power source or the like.

When the power sensor 21 is used as the utilization detecting means, the control circuit 24 controls the blowers 7 and 8 as described below to save power. As shown in FIG. 4, a CT (current transformer) forming a part of the electric power sensor 21 detects a current flowing through the electric light trunk line A of the hotel.
Similarly, the signal output from the CT is converted into a signal by the transducer TD which constitutes a part of the power sensor 21, and is further input to the meter relay MR. As shown in FIG.
The meter relay MR is a current flowing through the electric lamp main line A (see FIG. 5).
The signals MS1, MS2, MS3 and the like having a time width corresponding to the time when the reference value exceeds the set value (the level shown by the broken line) are output.

The control circuit 24 controls the signals MS1 and MS.
2, when MS3 is input, the signals MS1 and MS3 output the signals AP1 (output time T2) and AP5 (output time T4) according to the time width of the signals MS1 and MS3, and the signal MS2 after the time T1 has elapsed. Is ignored because the time during which the current flowing through the electric lamp main line A exceeds the set value is shorter than the specified time, and a signal corresponding to the signal MS2 is not output. However, when the signals AP1 and AP5 are for a long time, if the blowers 7 and 8 are stopped during this period, the amount of air required by the septic tank 1 will be insufficient, so the blower will be blown at a predetermined time (T3) interval. Since it is necessary to drive -7 and 8, signals AP2, 3 and 4 are output.

Signals AP1,2,3,4,5 as described above
Is output from the control circuit 24, the drive circuit 25 responds to the signals AP1, 2, 3, 4, 5 to blowers 7, 8
Is driven intermittently. In this way, the blowers 7 and 8 are driven intermittently according to the number of users of the hotel, and therefore the power consumption in the septic tank 1 is higher than that in the conventional case where the blowers 7 and 8 are continuously driven. The amount is reduced and the power saving effect is increased.

In the above example, the power sensor 21 is used as the utilization detecting means, but the same applies when the lighting switch ON number counter 21A is used. Further, when the above-described water flow meter 22 is used, the control circuit 24 intermittently controls the blowers 7 and 8 based on the flow rate of tap water instead of the electric current. When the people counter 23 is used, the control circuit 24 is based on the number of people in the hotel instead of the current.
Intermittently controls the blowers 7 and 8.

The power saving effect will be specifically described below. In the following description, the change in the number of users is not detected by the unit of time of day, but by the day of the week. Therefore, the data related to the number of users detected by the usage detecting means is the data on a day of week basis. As mentioned above, the septic tank 1 of this hotel is a tank for 5000 people, and the utilization rate of the hotel based on the data detected by the utilization detecting means is 50% from Monday to Friday (the number of users is limited. Half), and Saturday and Sunday were 100% (the number of users was full). In addition, with the number of users full,
The contact aeration tank first chamber 10 and the contact aeration tank second chamber 1 described above.
From the required daily air supply amount based on the daily oxygen amount required in 1, the output of each of the blowers 7 and 8 installed in the machine room 6 is 7.5 kW.

When the blowers 7, 8 are drive-controlled by the control circuit 24, the drive circuit 25, etc., since the hotel utilization rate is 100% on Saturday and Sunday, the blowers 7, 8 are continuously driven. In addition, on Monday, the utilization rate on Sunday the day before was 100%.
Blowers 7 and 8 are continuously driven because it takes about an hour and aeration time. Therefore, on Saturday, Sunday, and Monday, the blowers-7 and 8 are continuously driven, while on Tuesday, Wednesday,
On Thursdays and Fridays, the hotel usage rate is 50%, so
The operation rate of the blowers 7 and 8 is controlled to 50%.

Based on the above assumptions, the power consumption of the blowers 7, 8 is calculated as follows. The amount of electricity used on Saturday, Sunday, and Monday is 15kW (7.5k).
w × 2 units) × 24 H / d, which is 360 kw · H / d. On the other hand, the electric power consumption on Tuesday, Wednesday, Thursday, and Friday is 15 kw x 12 H / d, which is 180 kW.
H / d. (Or 7.5kw x 24H / d may be used by continuously operating with one blower)

When the amount of electric power used for one month is calculated under the above conditions, 360 kw · H / d × 12d + 180 kw · H /
d × 18d = 7560 kw · H. However, the total number of days of Saturday, Sunday, and Monday was 12 days, and the total number of days of Tuesday, Wednesday, Thursday, and Friday was 18 days.

Next, the amount of electric power used when the blowers 7 and 8 are continuously driven as in the conventional case is 360 kw · H / d × 3.
It becomes 0d = 10800 kw · H. Therefore, the amount of power consumption for one month is 10800kw · H-7560k.
w · H = 3240 kw · H. In this way, by controlling the blowers 7 and 8 based on the number of hotel users, a large power saving effect can be obtained.

The above power saving control is performed by the blowers 7, 8
Can be realized by intermittently driving the
In addition to intermittently driving 7 and 8, the drive speed of blowers 7 and 8 can be varied, and power consumption can also be saved by controlling the drive speed of blowers 7 and 8 based on the number of hotel users. Can be realized.

In the above example, the power saving effect was shown in the case of a hotel in which the number of users fluctuates on a day-to-day basis. Power can be saved by intermittently driving the blowers 7 and 8.

[0024]

As described above, according to the present invention, when the utilization detecting means detects the data corresponding to the number of people who are using the facility, the controlling means causes the utilization detecting means to operate. Since the amount of air based on the detected data is sent from the air blower, when the number of facility users is small, the amount of power used by the air blower is automatically reduced, so that it is the same as the conventional blower. It is possible to realize significant power saving as compared to the case where the blower device such as the above is continuously operated at full power.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a septic tank.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a control block diagram of a blower.

FIG. 4 is a control block diagram using a power sensor.

FIG. 5 is a current waveform diagram of an electric lamp main line.

FIG. 6 is an output signal waveform diagram of a meter relay.

FIG. 7 is an output signal waveform diagram of the control circuit.

[Explanation of symbols]

 1 Septic tank 7, 8 Blower 10 Contact aeration tank 1st chamber 11 Contact aeration tank 2nd chamber 21 Power sensor 22 Water flow meter 23 People counter 24 Control circuit 25 Drive circuit

Claims (5)

[Claims] 1. Use in a septic tank that supplies air from an air blower driven by power supply and treats sewage at a facility, and detects data relating to the number of users who are using the facility. A power-saving septic tank comprising: a degree detection means; and a control means that causes the air blower to send out an air amount based on the data detected by the utilization degree detection means. 2. The power-saving septic tank according to claim 1, wherein the utilization detecting means detects electric power used by the facility as data relating to the number of facility users. 3. The power-saving septic tank according to claim 1, wherein the utilization detecting means detects a total number of lighting switches provided in each room of the facility in an ON state as data relating to the number of facility users. . 4. The power-saving septic tank according to claim 1, wherein the utilization detecting means detects the amount of water used in the facility as data relating to the number of facility users. 5. The power-saving septic tank according to claim 1, wherein the utilization detecting means counts the number of persons entering and leaving at the facility entrance and detects the number of persons in the facility as data relating to the number of facility users.