JP3512348B2 - Operation control method of run-down wastewater treatment plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to
The raw water (sewage) flowing into the water pit is pumped into the raw water pit.
P₁, P₁′ To supply it to a purification treatment device for purification treatment,
Purification equipment for the amount of raw water supplied to the purification equipment
Drainage wastewater that discharges and discharges treated water from
Treatment plant, typically activated sludge process, oxidation
Operation of the drainage type wastewater treatment plant by the switch method (OD method)
An outlet-side flow meter that detects the discharge flow rate of the treated water
Pump P for supplying raw water from the water pit to the purification system₁,
P₁′ And a runoff wastewater treatment plant controlled by
The present invention relates to an operation control method for a hall. [0002] 2. Description of the Related Art FIG. 2 shows a population of about 700 to 800, 200
For example, in rural areas that biologically purify household wastewater
General of activated sludge wastewater treatment plants for settlement wastewater treatment.
Flow sheet from the sewer line 21 to the wastewater treatment plant
The raw water tank at the entrance of the building, or the final
Raw water tank (raw water tank and final manhole collectively)
Notation 1 ) Flows into one of the raw water pits.
Service pump P₁And one spare pump P₁′ To adjust flow rate
Pump into tank 2. Raw water is pumped from the flow control tank to the tank
P_Two, P_Two′, Pump it up to the measuring tank 4 and remove it from the measuring tank.
Treatment tank 5 (in this case, aeration tank with blower B)
And activated sludge or biofilm in the treatment tank.
Perform biological treatment and clean up. Water treated in the treatment tank
Is the amount of raw water supplied to the treatment tank from the measuring tank.
The wastewater is introduced into the settling tank 6 of the purification treatment device in
And sludge, and the supernatant water is introduced into the sterilization tank 7 for disinfection.
And treat it as treated water. Before the supernatant water flows into the sterilization tank
The COD is measured by a COD measuring instrument 10 such as a COD meter and a UV meter.
D is measured. Next, the sterilized treated water is released from the sterilization tank.
Introduced into flow tank 8 and pump P_Three, P_Three′ And pumped out
I do. Part of the sludge generated in the sedimentation tank is returned to the treatment tank
I do. [0003] As shown in FIG.
The capacity between -L is 10-1 of the maximum inflow (Qmax) over time.
About 5 minutes (about 45 minutes of daily average inflow Q), Q = 2
40m^Three/ Day, Qmax = 28.9m^Three/ Sometimes 4.
8m^Three~ 7.2m^ThreeSo here is 5.0m^ThreeAnd This
On the other hand, the capacity between the water level HL of the flow control tank 2 is the daily average flow rate.
6 hours or more, generally 6 to 9 hours, Q = 24
0m^Three/ Day, here is 60m for 6 hours^ThreeAnd original
In the water pit, it is possible to pump inflowed wastewater in a short time
The discharge amount that can be made, more precisely, the maximum inflow time (Qmax)
Two submersible pumps that can be pumped for regular use and spare
P₁And P₁'Is provided. There are two units in the flow control tank 2
One regular or one spare submersible pump
P_Two, P_Two'Is provided. Regular pump for flow control tank 2
P_TwoAnd the spare pump P_Two'Is discharged through a measuring tank
Supply a small amount of raw water to the tank to rapidly increase the load on the treatment tank.
Therefore, it is possible to pump more than the daily average amount of sewage.
In the case of settlement drainage treatment, when there are two regular pumps, one for each
Service pump P_TwoThe discharge amount of the raw water pit regular pump P
₁1/6 of the time, and the discharge amount is
One third of the water pit's regular pump. [0004] As shown in FIG.
Two or one regular pump P_TwoAnd the spare pump P_Two′
Is normally controlled by a level switch LS2 provided in the tank.
And service pump P_TwoStarts operation when the water level reaches 1 m
Start and stop when the water level drops to L
_Two'Starts operation when water level rises to 3.5m HH
Then, when the water level drops to 3mH, it stops. Of raw water pit
Service pump P₁And backup pump P₁'In the pit
The service pump P controlled by the level switch LS1₁Is water
When the water level becomes 2.0 m, the operation starts and the water level becomes 0 m.
When it falls to L, it stops. The raw water pit is as described above.
Since the volume is small and the discharge amount of the pump is large,
P₁ON and OFF are frequently repeated. Raw water pit schedule
Pump P₁′ Is lucky when the water level rises to 2.5m HH.
Rolling starts and stops when the water level drops to H of 2.0 m.
ANN where each level switch LS1, LS2 issues an alarm
The water level was 4.5m in the flow control tank and 3.0m in the raw water pit.
is there. [0005] The applicant of the present invention is Japanese Patent Application No. 7-70476.
FIG. 2 shows the configuration shown in FIG.
So, from raw water pit 1 to pump P₁, P₁′ To adjust the flow rate
Electromagnetic inlet-side flow indication for piping for pumping raw water into tank 2
An integrating recorder 11 (also referred to as an inlet-side flow meter) is provided.
A COD meter is installed in the water channel that leads the supernatant water from the tongue tank 6 to the sterilization tank 7,
A COD measuring device 10 such as a UV meter is processed from the discharge tank 8.
Pump P to release water_Three, P_Three′
An electromagnetic outlet-side flow indicator integrating recorder (outlet-side flow meter)
Also described. ), And the inlet-side flow meter 11
The raw water supplied from the raw water pit 1 to the flow control tank 2
For example, the amount of water sent every 10 minutes and the amount of water
Hourly discharge of treated water output by the mouth-side flow meter 12,
And the total discharge amount for one day, 1 output by the COD measuring device 10
Control COD value (mg / litre) of treated water every
A computing unit 9 such as a personal computer and a sequencer
Was disclosed. [0006] The input of the outlet side flow meter 12 is calculated by the arithmetic unit 9.
And the input of the COD measuring device 10 for one day of treated water
Calculate and calculate the total COD emission (kgCOD / day)
It became possible to memorize and record. CO of treated water
The reason for calculating the total daily emissions of D is dependent on the region.
50m of treated water a day^ThreeAs mentioned above,
The COD emissions per day per facility
Is determined and COD emissions per day are below the allowable value
Because proof of something is required,
COD ≒ BOD × 1.6-2.0, and BOD is
While COD can be estimated by calculation, COD cannot be measured continuously,
In addition, since it cannot be obtained unless it is analyzed by hand,
Estimate COD with BOD instead of OD and process
Check the condition and use the air for aeration according to the COD value.
Adjust the amount of sludge and the amount of returned sludge to ensure good and normal operation.
And to maintain. [0007] Raw water (sewage) flowing into the raw water pit 1
Average daily inflow (Q) is about 24
0m^ThreeThen, as shown by the solid line in FIG.
Then the inflow is almost 0, and the peak of inflow is around 10
Until the hour and twice from 6:00 to 8:00 in the evening, during the daytime
Small peak after lunch in the valley between morning and evening peaks
However, at other times, it flows in a lazy way. This normal inflow pattern
As long as the water level does not increase due to abnormal weather such as torrential rain,
Repeat daily. Therefore, the arithmetic unit 9 normally has an inflow pattern.
Of raw water from raw water pit 1 to flow control tank 2
The supply amount for every 10 minutes of time is stored, and the arithmetic unit is
The actual supply amount input by the inlet flowmeter 11 and the
Calculate the memory supply amount at the same time, and store the actual water supply amount
When the supply amount exceeds a predetermined amount for a predetermined time (for example, 30 minutes),
The calculator calculates the amount of raw water supplied from the raw water pit to the flow control tank.
It becomes a monitoring system to monitor the increase and decrease, and the actual supply amount is stored and stored.
The supply amount is further exceeded by a predetermined amount for a predetermined time (for example, 2 hours)
And the computing unit determines that water will increase,
Tomo service pump P _TwoTo the tank water level (level switch LS2
 ) Regardless of the operation, the raw water in the flow control tank is
Pumps up and flows forward before the increased water flows into the raw water pit.
Lower the water level in the volume adjustment tank, and the increased water flows from the raw water pit
Enter the flow control tank beyond the adjustment capacity of the flow control tank and process
Treated water whose quality has deteriorated has overflowed from the treatment tank
Or the water level in the flow control tank reaches the ANN level and an alarm is issued.
To avoid being overwhelmed by the response. [0009] In addition, when entering in a normal inflow pattern,
The side flow meter outputs the actual supply amount to the computing unit.
Because the difference between the calculator and the memory supply amount at that time is small, the
P_Two, P_Two'Is not performed. Therefore, the normal inflow pattern
Pump P₁, P₁′ Is the limit of the raw water pit
With the switch LS1, the pump P_Two, P_Two′ Of the flow control tank
The operation is controlled by the limit switch LS2. [0010] SUMMARY OF THE INVENTION The above-mentioned conventional apparatus has a
COD measurement at the outlet side to know the COD load of treated water
A measuring instrument 10 and a flow rate indicating integrating recorder 12 are installed.
The wastewater flows into the wastewater treatment plant and is supplied to the purification equipment.
Knowing the amount of raw water supply
Entrance to prevent deterioration of the quality of the treated water discharged at the time of rising water
The side flow indicator integrating recorder 11 is installed.
Since the indicator integrating recorder is a very expensive device, two
The cost of setting up a drainage wastewater treatment plant
It is causing the rise. Also, the flow meter on the inlet side is always in contact with dirty raw water.
Dirt adheres due to touch, and the original
The amount of raw water supplied from the water pit to the flow control tank, and
Correct the amount of raw water flowing into the drainage wastewater treatment plant.
There is a possibility that it will not be output to the control panel 3 or the computing unit 9,
Therefore, even though the raw water is flowing normally as usual,
The computing unit judged that there was an abnormal inflow and grasped the monitoring system
Conversely, despite the abnormal inflow,
May not be aware of the monitoring
There is a fear that it will be frustrated. [0012] SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems.
It was developed to solve the problem
The raw water flowing into the raw water pit according to the water level in the raw water pit.
Service pump P₁And the spare pump P₁′
It is supplied to the treatment tank from the flow rate adjustment tank of the purification
To the amount of raw water supplied to the purification
Drainage to discharge and discharge treated water from the treatment equipment
In the operation control method of the wastewater treatment plant, the treated water discharged
Outlet-side flow meter that detects and outputs the discharge flow of
Counts the flow rate of treated water discharged in response to the output of the side flow meter
And also purifies the raw water flowing into the raw water pit.
Service pump P to be supplied to the device₁And the spare pump P₁′ Earning
An operator is provided to input the operating time, and the discharged treated water is released.
Flow rate and service pump P₁And the spare pump P₁′ Operating time
And the raw water supplied to the purificationSupplyThe above computing unit
The water flowing into the raw water pit obtained
Based on the normal inflow pattern of water at predetermined time intervals of 24 hours a day
Then, the regular pump P of the raw water pit₁And a spare pump
P₁′ Determines the abnormal inflow based on the operating status of the
Pump P₁And the spare pump P₁'And the pump in the flow control tank
From the flow control tank of the purification system to the processing tank
Supply raw water without overflow to reduce the load on the treatment tank
It is characterized by not being raised sharply. [0013] FIG. 1 shows an embodiment of the present invention.
The same reference numerals are used for the same elements as in the conventional example of FIG.
No. is attached. In the present invention, the flow rate indication integrating recorder (flow rate
Meter 12) is provided only on the outlet side where the treated water is discharged.
No. In FIG. 1 (A), as in FIG.
Is discharged from the discharge tank 8 by the limit switch LS3.
Flow pump P_Three, P_Three′ To pump up and release treated water
Is provided in the discharge channel 8 ', as shown in FIG.
The treated water disinfected from the sterilization tank 7 flows naturally through the discharge tank 8
If it can be discharged under, discharge pump P_Three, P_Three′ Omitted
And a discharge pipe 7 ′ for discharging the treated water from the sterilization tank 7 to the discharge tank 8.
The outlet side flow meter 12 may be installed inside the
No. The outlet side flow meter 12 is similar to the conventional example shown in FIG.
The discharge rate of the treated water is input to the calculator 9 via the control panel 3.
Therefore, when knowing the COD load of treated water,
COD of supernatant water before sterilization from sedimentation tank 6 as in the previous case
Is measured by a COD measuring instrument 10 such as a COD meter and a UV meter,
The output is sent to a personal computer, sequencer, etc. via the control panel 3.
Input to the calculator 9, the calculator 9 determines the input and the flow rate on the outlet side.
Processed from integration of treated water output from total 12
Calculate and calculate the total COD emission per day of water, store it,
Can be recorded. Water level HL of raw water pit 1 and flow control tank 2
The capacity between the raw water pipes is as shown in paragraph 0003 above.
Service pump P₁, Backup pump P₁′, And flow control
Regular tank pump P_Two, Backup pump P_Two′ Is in operation
Level switch LS1 provided in pit 1 and tank 2 of
LS2 is controlled as described in paragraph 0004.
You. In addition, regular use of raw water pit 1 and backup pump P₁, P
₁', And the regular pump for the flow control tank 2 and the preliminary pump P_Two, P
_Two'Is connected to the control panel 3 and its operation status is input to the arithmetic unit.
And level switches for raw water pits and flow control tanks
LS1 and LS2 are also connected to control panel 3, and pit 1, tank
2 (level switches L, M, H, HH, AN
N, etc.) are also input to the computing unit 9.
You. In the present invention, the raw water pit 1 is normally used and is
Pump P₁, P₁′ Control the operating status (operating time)
3 and input to the arithmetic unit 9. Because of this, the pump
P₁, P ₁′, Connect an operating hour meter to each
The data may be input to a computing unit via a control panel using a running hour meter. or,
The outlet flow meter 12 controls the instantaneous discharge flow rate of the treated water discharged.
The data is input to the arithmetic unit 9 via the control panel 3. Arithmetic unit is on the outlet side
Receiving the input of the meter 12, processing every hour for 24 hours a day
Calculate the discharge rate of water and calculate the total discharge rate Qe of treated water per day
m^ThreeCalculate / day. Qe = q¹+ Q^Two＋ ・ ・ ・ ・ ・ ・ ・ + q^{twenty four}・ ・ ・ ・ ・ ・ ・ (1) q¹： Discharge of treated water for 1 hour from 0:00 to 1:00
[M^Three/time〕 q^Two： Discharge of treated water for 1 hour from 1:00 to 2:00
[M^Three/time〕 ∫ q^{twenty four}: Discharge of treated water for 1 hour from 23:00 to 24:00
Flow rate [m^Three/time〕 The arithmetic unit is used for the raw water pit 1 for regular use and for backup.
Submersible pump P₁, P₁′ Input for each pump
P₁, P₁′ Is calculated.   TP₁= T₁P₁+ T_TwoP₁+ ・ ・ ・ ・ ・ ・ ・ + T_{twenty four}P₁..... (2) TP₁： Common pump P₁Operating hours per day [hours /
Day〕 t₁P₁： Pump P₁1 hour from 0:00 to 1:00
Uptime t_TwoP₁： Pump P₁1 hour from 1:00 to 2:00
Uptime ∫ t_{twenty four}P₁： Pump P₁1 from 23:00 to 24:00
Working hours of time   TP₁'= T₁P₁'+ T_TwoP₁'+ ... + t_{twenty four}P₁'... (3) TP₁': Reserve pump P₁'Working hours per day [hours
Between / day) t₁P₁': Pump P₁'1 from 00:00 to 1:00
Working hours of time t_TwoP₁': Pump P₁'From 1 to 2:00
Working hours of time ∫ t_{twenty four}P₁': Pump P₁'From 23:00 to 24:00
One hour working time Raw water flows in the normal inflow pattern shown by the solid line in FIG.
When entering, the amount of raw water supplied to the purification
The treated water drips from the purification system and is discharged and discharged.
And the discharge rate Qem of treated water per day^Three/ Day and 1 day allowance
Raw water inflow Qim^Three/ Days are consistent. Qi = Qe (4) Regular pump P for raw water pit₁QP
₁, The same preliminary pump P₁'Is the daily pumping amount of Q
P₁′ Qi = QP₁+ QP₁'... (5) QP₁= TP₁・ Q_AVP₁・ ・ ・ ・ ・ ・ (6) QP₁'= TP₁'・ Q_AVP₁'... (7) QP₁： Pump P₁Pumping amount per day [m^Three/Day〕 Q_AVP₁： Pump P₁Average amount of pumped water per hour [m^Three
/time〕 QP₁': Pump P₁Pumping amount per day [m^Three/Day〕 Q_AVP₁': Pump P₁'Average pumped water per hour
[M^Three/time〕 From the above equations (4), (5), (6) and (7)
Ri   Qe = Qi = QP₁+ QP₁′             = TP₁・ Q_AVP₁+ TP₁'・ Q_AVP₁'... (8) Here, in general, the service pump P₁And backup pump P₁′ Is the same
Use the same model from one manufacturer under the same conditions. Therefore Q_AVP₁= Q_AVP₁'... (9) Then Qe = (TP₁+ TP₁') ・ Q_AVP₁ Q_AVP₁= (Qe) / (TP₁+ TP₁') (= Q_AVP
₁′) ································································································································
₁And the spare pump P₁′_AVP₁, Q _AVP₁′
And the discharge amount Qe of the treated water input by the outlet side flow meter 12;
Pump P₁, P ₁′ Can be obtained from the operating time
You. The above items will be specifically described. Fig. 4 Normal inflow
Regular pump P at raw water pit in case of pattern (solid line)
₁5 is shown in FIG. Here, regular use of the raw water pit, spare
50m discharge rate per pump^Three/ Hour (H)
And the water volume of the raw water pit between the water levels H and L is described in paragraph 0.
5m as shown in 003^ThreeIt is. From 5:00 to 6:00
50m^Three/ P capacity pump P for raw water pit
₁Operated for 6 minutes × 2 times = 12 minutes. Pumping volume is 50m^Three
/ H × 1 / 5H = 10m^Three/ Hour. Like seven o'clock
From 8:00 to 50m^Three/ H × 2 / 5H = 20m^Three
Becomes Thereafter, the process proceeds in the same manner. As described above, the raw water pick-up in the normal inflow pattern
Service pump P₁  The pumping amount of
Become like     0:00 to 1:00 0m^Three     1:00 to 2:00 0m^Three     2:00 to 3:00 0m^Three     3:00 to 4:00 0m^Three     4:00 to 5:00 0m^Three     5:00 to 6:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three     6:00 to 7:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three     7:00 to 8:00 50m^Three/ H × (6/60 × 4 times) H = 20m^Three     8:00 to 9:00 50m^Three/ H × (6/60 × 6 times) H = 30m^Three     9: 00-10: 00 50m^Three/ H × (6/60 × 8 times) H = 40m^Three   10:00 to 11:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three   11:00 to 12:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   12: 00-13: 00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   13:00 to 14:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three   14:00 to 15:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   15: 00-16: 00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   16: 00-17: 00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   17:00 to 18:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   18:00 to 19:00 50m^Three/ H × (6/60 × 4 times) H = 20m^Three   19:00 to 20:00 50m^Three/ H × (6/60 × 6 times) H = 30m^Three   20: 00-21: 00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three   21:00 to 22:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three   22:00 to 23:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three   23:00 to 24:00 0m^Three By this, total pumping from 0:00 to 24:00
240m^Three/ Day. On the other hand, from 0 o'clock to 7 o'clock in FIG.
Regular use at the raw water pit in the case of a turn (dash-dot line), and
The operation of the backup pump is shown in FIG. 0:00 to 1:00, 1:00
2 o'clock and 50m each^Three/ H × 1 / 10H = 5m^ThreeAddressed to
Pumped up, 50m from 2:00 to 3:00^Three/ H × 1 / 5H = 1
0m^ThreePump it up. From 3 o'clock to 4 o'clock, FIG.
After 6 minutes from 3:06 to 3:12 as shown in the figure, 3:00
It is a continuous operation for 42 minutes from 18 minutes to 4:00.
The pumping amount during this period is 50m^Three/ H × (6 + 42) / 6
0H = 40m^ThreeBecomes This is shown from 0:00 to 24:00.
It looks like below.   0:00 to 1:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   1:00 to 2:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three   2:00 to 3:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three   3:00 to 3:30 50m^Three/ H × (6/60 × 3 times) H = 15m^Three   3:30-4:00 50m^Three/ H × (30/60 × 1 time) H = 25m^Three   4:00 to 5:00 50m^Three/ H × (60/60 + 6/60 × 6 times) H                           = 80m^Three     5:00 to 6:00 50m^Three/ H × (60/60 + 10/60 × 2 times)                           H = 60m^Three     6:00 to 7:00 50m^Three/ H × (6/60 × 8 times) H = 40m^Three   7:00 to 8:00 50m^Three/ H × (6/60 × 4 times) H = 20m^Three   8:00 to 9:00 50m^Three/ H × (6/60 × 6 times) H = 30m^Three   9: 00-10: 00 50m^Three/ H × (6/60 × 8 times) H = 40m^Three 10:00 to 11:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three 11:00 to 12:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three 12: 00-13: 00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three 13:00 to 14:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three 14:00 to 15:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three 15: 00-16: 00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three 16: 00-17: 00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three 17:00 to 18:00 50m^Three/ H × (6/60 × 1 time) H = 5m^Three 18:00 to 19:00 50m^Three/ H × (6/60 × 4 times) H = 20m^Three 19:00 to 20:00 50m^Three/ H × (6/60 × 6 times) H = 30m^Three 20: 00-21: 00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three 21:00 to 22:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three 22:00 to 23:00 50m^Three/ H × (6/60 × 2 times) H = 10m^Three 23:00 to 24:00 0m^Three By this, total pumping from 0:00 to 24:00
The amount is 460m^Three/ Day. Such a normal inflow pattern and an abnormal inflow
For the operation status of the pump in the raw water pit during the pattern
The water level in the flow control tank and the flow from the flow control tank to the treatment tank.
Figures 7, 8, and 9 show the amount of water supply. Figure 7 shows a general control method
8 and 9 show the abnormal inflow patterns, respectively.
This is a corresponding example. FIGS. 7, 8, and 9 show the inside of the flow control tank.
The explanation is for the case of one regular pump and one spare pump.
You. When there are three pumps in this flow control tank, two pumps are always used.
One is spare. In addition, the two regular ones are pump life
Switch for a certain period of time, for example, every two weeks to extend your life
It is often obtained. The switching method is three underwater
Assuming that the pumps are A, B, and C, A and B are used for two weeks.
During the period, C is reserved, B and C are regular for the next two weeks, A is reserved,
For the next two weeks, C and A are in regular use and B is in reserve.
For three pumps, each pump has the same capacity
Therefore, the pumping volume of one spare pump during operation is two regular
Of の. Here, the driving situation is simple
One case and one spare unit will be specifically described. FIG.
Is one of the regular pumps in the flow control tank when the water level reaches M
And stopped at L. When the water level reaches HH
A completely general control method of driving and using one at H
Is the law. In this case, as shown in FIG.
ANN (alarm water level) and raw water overflows until 6:00
Spill into the next processing tank with a low. Flow adjustment until 10:20
The tank pump is operated by two regular and spare pumps.
Are operating one regular service. One regular car is 14:53
And then run again from 18:12 to 23:00. This
The amount of water supplied by both regular and spare pumps during the period is shown in the upper part of FIG.
And the pumping amount is 450m^ThreeIt is. Flow adjustment
10m overflow from tank to processing tank^ThreeBecomes
460m when measured^Three/ Day. This is usually the inflow putter
Unable to cope with abnormal inflow pattern, flow rate adjustment
Raw water 10m from tank to treatment tank^ThreeTreated water that overflows and discharges
Indicates that the water quality of the water is deteriorated. On the other hand, pump P for raw water pit₁, P₁'of
Judge that abnormal inflow may occur depending on operating conditions
FIG. 8 and FIG. 9 show an example in which a corresponding action is taken. FIG.
Are 0:00 to 1:00 and 1:00 to 2:00 in FIG.
There was one operation of the service pump of each raw water pit
Judgment of the possibility of abnormalities in the event, abnormal in the next 2:30 operation
And the pump P of the flow control tank_TwoCommand start
You. In addition, regular pump P at 3:30₁From intermittent to continuous
When the pump becomes_Two′ To start
You. FIG. 9 shows the case of 0:00 to 1:00 and 1:00 to 2:00.
Regular pump P for one raw water pit each time₁Driving
Judge that there may be an abnormal inflow in the next two:
Judgment that there is a possibility of abnormality in the operation from 00 to 3:00
After a predetermined period of time, for example, three hours,
Two pumps P for regular use and spare for volume adjustment tank_Two, P _TwoSame as ′
Sometimes command start. As described above, correspondence 1 in FIG. 8 and correspondence 2 in FIG.
In both cases, different from FIG.
Raw water can be supplied without overflowing to the tank.
Wear. As a result, as shown in FIG.
Means that even if there is an abnormal inflow, the treated water satisfies the discharge standard value.
However, in the case of FIG. 7 which does not correspond,
Water quality (BOD here) deteriorates rapidly. one time
If it gets worse, it will not return to the original water quality for half a day to 1.5 days
No. As described above, the raw water pit pump P₁,
P₁′ To determine if there is an abnormal inflow.
If it is determined that there is an abnormal inflow,
Regular and spare submersible pump P_Two, P_Two′ To control
And no detection of abnormal inflow
At the same time as the water level (level switch) in the flow control tank
The effect on treated water is very different from
In the former, the quality of treated water does not deteriorate
On the other hand, in the latter, the quality of treated water deteriorates. Upon release to public waters,
Satisfying the discharge standard value must be observed
Although it is not a matter, there is a flow meter only on the discharge side as in the present invention.
Is installed, and the inflow rate depends on the operation status of the pump in the raw water pit.
Knowing that it is possible to respond in an abnormal inflow condition
Become. In the normal case, the amount of inflow water and the amount of treated water are the same.
Therefore, the discharge amount of raw water pump (= treated water amount / raw water pump
Working time) is always confirmed, and the amount of
It has been corrected. As described in paragraph 0018, the raw water pit
Service pump P₁And the spare pump P₁′ Is the same
One model is used under the same conditions.₁,
P₁′, There is a difference in performance, the pump coefficient is calculated by equation
To adjust. Also, the amount of treated water used for calculation,
And pump P₁, P₁′ For about one week
May be longer depending on the time)
Use the average (operating average updated daily)
Is preferred. [0030] As is clear from the above, the conventional run-off
In the type wastewater treatment equipment, the amount of raw water flowing into the purification treatment equipment,
And purification of the treated water from the purification
Very expensive separately at the inlet and outlet of
Install a flow rate indicator integrating recorder, connect it to the control panel,
Although the amount and discharge rate were input to the computing unit, the present invention
One flow rate indicator integrated recorder installed at the exit side of the processing equipment
To know the discharge rate of treated water,
To the operating status (number of operations) of regular and spare submersible pumps
Knowing the amount of raw water flowing into the purification treatment equipment
Corresponding to the pattern, it is possible to prevent the deterioration of treated water quality
Wear. In other words, pump P of raw water pit₁, P₁′ Operation
If you know the number of times, you can use raw water without sophisticated pattern recognition.
It is possible to easily determine the normal inflow and the abnormal inflow.
And one expensive flow meter can be used,
Installation costs and instrument maintenance costs are reduced to one unit. Change
In addition, this flow meter is not dirty water, it is treated and clean
Because it comes into contact with the treated water,
Is also kept clean and easy to maintain because there is little dirt.
And does not malfunction. And the raw water abnormality
Can respond quickly to inflow. In other words, the abnormal state
Being able to know quickly and respond so that
Automatically responds quickly to abnormal inflows,
Water quality can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (A) is an explanatory view of one embodiment of a activated sludge run-off type wastewater treatment plant operated according to the present invention, and FIG. 1 (B) is a run-down type run-down type waste water treatment plant operated according to the present invention. Explanatory drawing of the principal part of other embodiment of the wastewater treatment plant. FIG. 2 is an explanatory view of a conventional activated sludge run-off type wastewater treatment plant. 3 is a cross-sectional view of a part of a raw water pit, a flow tank, and a treatment tank in FIG. 1; 4A is a diagram showing a normal inflow pattern of raw water in a raw water pit for a day and an abnormal inflow pattern, and FIG. 4B is an enlarged view of a part of the abnormal inflow pattern of the above. FIG. 5 is an explanatory diagram of an operation state of a raw water pit pump in the normal inflow pattern of FIG. 4; 6 is an explanatory diagram in which the operation state of the pump of the raw water pit in the abnormal inflow pattern of FIG. 4 is superimposed on the operation state of the pump of the raw water pit in the normal inflow pattern of FIG. 5; FIG. 7 is an explanatory diagram of a supply state of raw water from a flow rate adjustment tank to a treatment tank in a normal inflow pattern and an abnormal inflow pattern in FIG. 4; 8A is a diagram showing an example of the supply amount of raw water from the flow rate adjustment tank to the treatment tank corresponding to the abnormal inflow pattern of FIG. 4 by the pumps P ₂ and P ₂ ′, and FIG. The figure which shows the fluctuation | variation of the water level in an adjustment tank (the number in a parenthesis represents a water level, and the number outside a parenthesis shows a water quantity). 9A is a diagram showing the supply amount of raw water from the flow control tank to the processing tank in another example corresponding to the abnormal inflow pattern in FIG. 4 by the pumps P ₂ and P ₂ ′, and FIG. Figure showing the fluctuation of the water level in the flow control tank in (The number in parentheses is the water level,
The numbers outside the parentheses indicate the amount of water). FIG. 10 is a diagram showing changes in the quality of treated water when the abnormal water flow pattern does not correspond to the abnormal inflow pattern and when the abnormal flow pattern corresponds to the abnormal inflow pattern. [Description of Signs] 1 Raw water pit P ₁ Regular pump for raw water pit P ₁ ′ Preliminary pump for raw water pit 2 Flow regulating tank P ₂ Regular pump for flow regulating tank P ₂ ′ Spare pump for flow regulating tank 3 Control panel 4 Measuring tank Reference Signs List 5 Purification treatment equipment (treatment tank) 6 Sedimentation tank 7 Sterilization tank for disinfection 8 Discharge tank 9 Computing unit (PC, sequencer) 10 COD measuring instrument (COD meter, UV meter, etc.) 12 Outlet-side flow meter (electromagnetic flow rate indicator (Integrated flow meter) 21 Sewage pipeline

Claims (1)

(57) [Claims 1] A regular pump P ₁ that operates raw water flowing from a sewer pipe into a raw water pit according to the water level in the raw water pit.
Then, the purified water is supplied to the treatment tank from the flow control tank of the purification treatment device via the preliminary pump P ₁ ′ to perform the purification treatment, and the treated water is dripped and discharged from the purification treatment device to the supply amount of the raw water supplied to the purification treatment device. In the operation control method of the draining wastewater treatment plant to be discharged, the outlet flowmeter that detects and outputs the discharge flow rate of the treated water discharged, and the discharge flow rate of the treated water discharged and received by the output of the outlet flow meter. with aggregate, wherein the common pump P ₁ supplies the raw water that has flowed into the raw water pit purification treatment unit, a computing unit provided operation time of the preliminary pump P ₁ 'is input, a discharge amount of discharge and treated water, Service pump P
₁ and the operating time of the backup pump P ₁ ′, the supply amount of raw water to be supplied to the purification treatment device is calculated by the above-mentioned computing unit, and the obtained raw water flowing into the raw water pit is obtained for a predetermined period of 24 hours a day. based on normal inflow pattern for every time, a conventional pump P ₁ of raw water pit, 'determines the abnormal inflow by operating status of, and the conventional pump P _1, preliminary pump P _1' spare pump P ₁ and the flow regulation tank The operation of a run-down type wastewater treatment plant characterized by controlling the pump and supplying raw water without overflowing from the flow control tank of the purification treatment device to the treatment tank so that the load on the treatment tank is not suddenly increased. Control method.